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Understanding the impact of ‘cost’ under MACRA: a neurointerventional imperative!
  1. Gabriela Spilberg1,
  2. Gregory N Nicola2,
  3. Andrew B Rosenkrantz3,
  4. Ezequiel Silva III4,
  5. Clemens M Schirmer5,
  6. Brian B Ghoshhajra1,
  7. Nirmal Choradia6,
  8. Rose Do7,
  9. Joshua A Hirsch8
  1. 1 Department of Radiology, Massachusetts General Hospital, Boston, Massachusetts, USA
  2. 2 Hackensack Radiology Group, Hackensack, New Jersey, USA
  3. 3 Department of Radiology, NYU Langone Medical Center, New York, USA
  4. 4 South Texas Radiology Group, San Antonio, Texas, USA
  5. 5 Department of Neurosurgery, Neuroscience Institute, Geisinger, Wilkes-Barre, Pennsylvania, USA
  6. 6 Acumen, LLC, Burlingame, California, USA
  7. 7 Department of Cardiology and Cardiac Surgery, Veterans Affairs Medical Center, Long Beach, Kaiser Permanente of Southern California, Acumen, LLC, Long Beach, California, USA
  8. 8 Interventional Neuroradiology, Massachusetts General Hospital, Harvard Medical School, Boston, Massachusetts, USA
  1. Correspondence to Dr Joshua A Hirsch, Interventional Neuroradiology, Massachusetts General Hospital, Harvard Medical School, Boston, MA 02114, USA; hirsch{at}


The cost of providing healthcare in the United States continues to rise. The Affordable Care Act created systems to test value-based alternative payments models. Traditionally, procedure-based specialists such as neurointerventionalists have largely functioned in, and are thus familiar with, the traditional Fee for Service system. Administrative charge data would suggest that neurointerventional surgery is an expensive specialty. The Medicare Access and CHIP Reauthorization Act consolidated pre-existing federal performance programs in the Merit-based Incentive Payments System (MIPS), including a performance category called ‘cost’. Understanding cost as a dimension that contributes to the value of care delivered is critical for succeeding in MIPS and offers a meaningful route for favorably bending the cost curve.

  • socioeconomics
  • health care policy
  • QPP

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The United States has the most expensive healthcare system in the world with 2016 health expenses estimated at $9892.3 per person, representing approximately 17.2% of the Gross Domestic Product.1 The Affordable Care Act of 2010 (ACA) made significant efforts toward reducing the growth of healthcare costs.2 3 In terms of those controls, the ACA created two independent boards that theoretically could exercise substantial control over American healthcare: the now defunct Independent Payment Advisory Board (IPAB, whose primary role was to achieve savings theoretically without compromising coverage or quality) and the Patient-Centered Outcomes Research Institute (PCORI, whose primary function is to explore the effectiveness of diverse medical treatments).4–6 The ACA also created the Center for Medicare and Medicaid Innovation (CMMI) to help implement models of value-driven care and design new alternative payment models.7 One of the central concepts of the CMMI is to support the transition from a volume-based payment model into an outcome-focused and resource-efficient healthcare system.8

The Medicare Access and CHIP Reauthorization Act (MACRA) of 2015 ended the Sustainable Grown Rate formula, which was a controversial method used by the Centers for Medicare & Medicaid Services (CMS) to regulate spending by Medicare on physician services.9–12 Additionally, the MACRA expanded the Obama administration’s view of healthcare reform by focusing on three main principles:13 14

  1. The use of incentives to stimulate high-value care by tying both hospital and physician payments to new value-based payment models.

  2. Increase integration of care delivery, with more efficient teams and care coordination, as well as more awareness by providers to population health.

  3. Use of health information technology to optimize patient care.

Implicit to MACRA is the emphasis on transitioning healthcare delivery from a traditional Fee for Service (FFS) volume-based payment model into an approach that incentivizes value-based patient-centric care. This act provided two pathways forward for future provider payments. The Merit-Based Incentive Payment System (MIPS) is the non-linear descendent of FFS with a superimposed value purchasing methodology.15 16 In April 2016, CMS introduced incremental information regarding MACRA implementation, the Quality Payment Program (QPP), under which physician compensation (Medicare part B payment) was tied to either one of these tracks: MIPS or Advanced Alternative Payment Models (APMs).11 17 18 Recently, CMS has further delineated the specific goals of the QPP, stating that the idea is to ‘create a simpler, sustainable Medicare program.19

To achieve the status of Qualified APM Participant (QP) through participation in an Advanced APM requires fulfilling predetermined strict criteria.20 21 Eligible professionals and groups were informed during 2017 regarding their APM or MIPS inclusion status. QP status releases providers of much of its administrative reporting burden, yields generous financial incentives, and ultimately a separate, higher, conversion factor.22 23 Multiple additional models have been previously discussed in this journal including bundled payments, Accountable Care Organizations (ACOs), and Physician-Focused Payment Models (PFPM).22 24–26

Under the current MACRA framework, the majority of eligible physicians including neurointerventionalists will use the MIPS pathway.27 28 Under this route, physicians can engage either as individuals, groups, or as a virtual group, as long as more than one taxpayer identification number (TIN) is attributable to a virtual group.29 Recently, it has been suggested that participating as a group or virtual group may be beneficial for specialists such as neurointerventionalists. The rationale includes greater flexibility in reporting mechanisms, operational simplification, and overall cost reduction. However, this will vary by specific practice circumstance.30

Four performance categories will be independently evaluated and scored under MIPS, collectively yielding an overall Final Score (FS). A FS between 0 denoting non-participation and 100 results in a positive, neutral, or negative adjustment of the traditional FFS payment. The categories are quality, improvement activities, advancing care information, and cost.18 The first three categories were an expansion of existing programs – Physician Quality Reporting System (PQRS), the Physician Value-based Payment Modifier (VM), and the Medicare Electronic Health Record (EHR) Incentive Program for Eligible Professionals (EPs), but cost, while seemingly a new metric is, in fact, a carry-over from the VM under the ACA. Improvement activity is a new true category under MIPS. Medicare part payments will be adjusted up to + or - 4% depending on participants’ FS. Subsequently, compensation variation is expected to shift further, to a maximum of + or - 9% by 2022, creating an overall payment disparity absent scaling factors that potentially approaches 20%.22 31 32

The MIPS cost performance category is being calculated starting in performance year (calendar year - CY) 2017. However, it is weighted at 0% in the FS. Even though cost does not require specific reporting at present, the other MIPS data of 2017 CY must be reported by the end of March 2018.33 For CY 2018 (2020 payment year), cost will be weighted at 10% of the FS.34 35 Until the recently dropped congressional budget, for the following CY 2019, FS was expected to increase to 30% wt cost-based. With the Bipartisan Budget Act (BBA) of 2018, CMS has been given greater flexibility in pursuing years for reweighting of cost to 10% through 2021.36 The authors believe it likely that these changes will slow the momentum considerably and that cost will not be weighted to 30% in 2019.

The recently published 2018 MACRA final rule35 provides the following overall FS weights: Performance year 2017: Quality 60%, Cost 0%, Improvement Activities 15%, and Advancing Care Information 25%. Performance year 2018: Quality 50%, Cost 10%, Improvement Activities 15%, and Advancing Care Information 25%.

What is MIPS ‘cost’?

The concept of cost under MIPS is to empower clinicians with comparison information on healthcare resource spending with the goal of helping decrease unneeded costs and cost growth. Often, it is believed that clinicians do not make decisions aware of expenses or even consider different values for various choices.37 Clinicians were first held accountable for cost under the Patient Protection and Affordable Care Act of 2010 through of the federal value modifier program (VM). The VM brought responsibility for cost via three performance metrics: Medicare spending per beneficiary (MSPB); total per capita costs (TPCC) for all attributed beneficiaries; and PCC of beneficiaries with four specific conditions.38 39

Cost measurement in MIPS differs from the VM in several substantive ways table 1. First, the four TPCC measures with specific conditions that were part of the VM are not used in MIPS. New episodic measures with significant clinical input from start to finish are now under construction which CMS intends to propose to adopt in future rulemaking.35 Second, there are some differences between the VM and MIPS versions of the MSPB and TPCC measures.40 41 For instance, the threshold number of attributed episodes needed per clinician before MSPB was deemed valid measurement of that said physician’s cost and was reduced from 125 episodes (the value in the final year of the VM) to 35 for MIPS MSPB, seemingly expanding the number of clinicians to which this measurement tool would apply. Lastly, altering the attribution methodology of MSPB, which previously prescribed attribution of patients to the TIN with plurality of applicable part B Medicare claims during a performance period under the VM, but now would attribute patients to each unique NPI/TIN combination with plurality of applicable part B Medicare claims during the performance period. It is worth noting that the VM specialty adjustment was removed. If a clinician chose to report MIPS MSPB as an individual, then only episodes attributed to them for MSPB during the performance period would count toward the MSPB threshold. However, if the clinician reported MIPS MSPB with a group, then all clinicians in the reporting TIN’s attributes will be summed together, counting toward the threshold value of 35 episodes. This last modification introduced a strategic decision point for clinicians in MIPS which did not exist in the VM. Clinicians that may not have reached minimum threshold values for MSPB if they reported as individuals, may be able to, if they decide to report as part of a group.37 38 In the case of TPCC, the finalized version for use in MIPS differs slightly from the measure included in the VM. First, while the VM version of the measure attributes at the TIN level, the MIPS version of the measure attributes at the Taxpayer Identification Number/National Provider Identifier (TIN/NPI) level, with the option to report at either the TIN-NPI or TIN level. Second, for attribution in the MIPS version, the definition of primary care services was expanded to include care coordination codes for chronic care management (CCM) and transitional care management (TCM). Finally, attribution in the MIPS version of the TPCC measure excludes nursing visits that occur in a Skilled Nursing Facility (SNF).29

Table 1

Comparison of the two metrics currently in use for MIPS performance year 2018, and episode-based cost, currently under development by CMS/Acumen LLC31 37 40 41

MSPB: a deeper dive

MSPB is the cost of dollars per patient on Medicare Part A and Part B for a professional or group during an episode. Medicare part D covered drugs that are not included in this calculation. The MSPB episode is temporally defined in a ‘window’, starting 3 days before hospital admission (index admission) and ending 30 days after hospital discharge. This metric was conceptualized as CMS’s tool for assessing hospitals and physician’s financial efficiency in the VM program32 and updated into MIPS.41 This metric aims to incentivize care coordination, reduce fragmentation, and improve efficiency.29 MSPB does not delineate legitimate and justifiable differences in cost in making its calculation, and therefore it is a blunt instrument. This situation is problematic for NI specialists who in the absence of an episode, could default into MSPB as a measure. The updated MSPB is calculated based on seven steps with the specified formula (figure 1):

  1. Define the population of index admissions.

  2. Calculate payment-standardized episode costs.

  3. Calculate expected episode costs.

  4. Exclude outliers.

  5. Attribute episodes to a TIN-NPI.

  6. Calculate the MSPB measure for the TIN-NPI or TIN.

  7. Report the MSPB measure for the TIN-NPI or TIN.

Figure 1

Originally developed for the value modifierr program, the MSPB clinician measure was updated in 2017 for the MIPS cost performance category.41

MSPB attribution has changed in two fundamental ways.

  1. Under VM, MSPB was first attributed to a TIN with the plurality of part B services on the index patient (it was subsequently assigned to an NPI, but this was an insignificant bookkeeping attribute). Under MIPS, the attribution occurs at the NPI-TIN or TIN level depending on whether you report as an individual, group, or virtual group. This change in methodology has strategic implications as it is harder to get an attribute as an NPI-TIN than it is as a TIN. This strategy did not exist under VM.

  2. The threshold of attributes changed several times during VM but ended up at 125. In MIPS the threshold is 35.

TPCC: a deeper dive

The TPCC for all attributed beneficiaries considers all Medicare Part A and B spending for each beneficiary, excluding Medicare Part D covered drugs. The measurement is customized by specialty, annualized, standardized, and also risk-adjusted.42 43 This metric was also developed in the VM program and modified for MIPS.40 This variable aims to identify and promote providers who yield high-quality care in an efficient fashion. TPCC will most likely apply to primary caregivers. The updated TPCC calculation is also based on seven steps, with the specified formula (figure 2):

  1. Attribute beneficiaries to TIN-NPI.

  2. Calculate payment standardized per-capita costs.

  3. Annualize costs.

  4. Risk-adjusted costs.

  5. Specialty-adjusted costs.

  6. Calculate the TPCC measure for the TIN-NPI or TIN.

  7. Report the TPCC measure for the TIN-NPI or TIN.

Figure 2

Originally developed for the value modifier program, the TPCC or all attributed beneficiaries measure was updated in 2017 for the MIPS cost performance category.40

Both MSPB and TPCC are risk-adjusted metrics, which take into consideration beneficiaries’ age and comorbidities. The risk-adjustment methodology for both is based on the CMS Hierarchical Condition Category (CMS-HCC) model, which is used for the Medicare Advantage program.44 However, there are distinct updates developed for each of the two metrics, beyond the scope of this paper.

The clinical episode-based measure is a novel, third metric, currently under development. These measures are the most likely to impact neurointerventionalists. The authors of this manuscript would argue that being able to participate is indeed beneficial. It will not be used for CY 2017 or 2018, with the expectation that it will ultimately be used for the cost score. Clinical episode-based measures are a Medicare Part A and B claim-based platform, which ties services and items delivered to address a given medical condition during a timeframe.31 The episode-based cost represents the price to Medicare for particular services and needs of a patient during a specific episode of care.37 In general, there are two distinct ways to trigger an episode, either based on professional CPT/ICD-10-based claims or inpatient DRG claims submitted. Five elements are fundamental in the episode-based cost:25

  1. Defining an episode group.

  2. Assignment of the cost to the episode group.

  3. Connecting an episode group to specific clinicians.

  4. Risk adjustment of the episode groups.

  5. ‘Coupling’ cost and quality (which incorporates outcomes, processes of care, and patient engagement/experience).

CY 2017 (also referred as the transitional year)

The concept of the transitional CY 2017 is essential to note, despite it having already passed. It demonstrates the desire by CMS to allow clinicians an opportunity to experience how the program will work, and to iterate into the reporting processes of the other metrics as well as the development of specifics for each category.29 Cost was not used to calculate the FS in the transitional year.35

CY 2018

For 2018 CY, 10% of the FS will be calculated based on the average of TPCC for all attributed beneficiaries and MSPB. The final rule of the Quality Payment Program35 opted for a 10% weight and is an attempt to soften the transition for the subsequent year when cost will be scored at 30% as has now been actively addressed in the BBA of 2018.36 CMS will grade eligible physicians and groups using administrative claims data if they meet the case minimum for the metric and if a benchmark is available for comparison. If only one criterion can be evaluated, this single number will represent the whole cost score. The10 episode-based cost measures that were assessed during 2017 CY will not be used for the 2018 CY and thus will not be covered here.

Transitioning from CY 2017 to 2018: improvement FS for cost

Starting CY 2018, performance scores will be available to the cost metric.34 If there is data available, CMS will assign a grade for statistically significant changes. If no information is available, a score of 0 will be assigned, nevertheless this has been abolished in years 3, 4, and 5 in the BBA of 2018.35

For CY 2018, CMS has contracted with Acumen LLC to develop a new episode of care system, currently under testing, to comply with the MACRA rules.35 Acumen LLC is a research and consulting firm which specializes in health policy and traditionally works with government agencies45 46 that CMS contracted to this endeavor. This entity engaged two separate subgroups to help with the process: a conglomerate of seven Clinical Subcommittees (CS) and Technical Expert Panels (TEPs).37 Of note, at least four NI specialists are involved in the Acumen effort.

The primary role of these subgroups is to engage in the process development of this new system. Important goals include determining how to trigger episodes (to define patient cohorts), establishing episodic windows of care, assigning services to episodes, and tailoring risk adjustment to the episode group. The TEPs have a more general composition, including members with varied backgrounds such as researchers, statisticians, subject matter experts, patients, and caregivers. The TEP’s central focus is to evaluate resource utilization, category development, and quality metric alignment. Clinical Subcommittees are less broad, being subspecialty-oriented with a defined clinical background. The objective of each panel or subcommittee is to assist in developing specifications of the episode groups (such as what are the triggering episodes, diagnosis codes for triggering episode groups, timelines, what services should and should not be included, etc).37

With support from these two types of expert panels and input/comments from the public/stakeholders, a list of eight episode-based groups (box 1) has been created based on the following criteria: (A) potential impact on Medicare spending. (B) clinical coherence regarding a patient population that has a similar stage and severity of a particular illness or condition. (C) the measure’s opportunity for improvement. (D) the measure’s opportunity for alignment with established quality indicators. Relevant factors that were accounted for included ‘volume of beneficiaries impacted by the condition or procedure, the share of cost to Medicare impacted by the condition or procedure, the number of clinicians/clinician groups attributed, and the potential for alignment with existing quality measures.31

Box 1

Episode-based groups, under development

  1. Elective outpatient percutaneous coronary intervention (PCI).

  2. Knee arthroplasty.

  3. Revascularization for lower extremity chronic critical limb ischemia.

  4. Routine cataract removal with intraocular lens (IOL) implantation.

  5. Screening/surveillance colonoscopy.

  6. Intracranial hemorrhage or cerebral infarction.

  7. Simple pneumonia with hospitalization.

  8. ST-elevation myocardial infarction (STEMI) with PCI.

The process of episode group development

Defining the episode group

Episode groups are units to represent an assemblage of medical services to treat a medical condition. By creating this metric, it is possible to calculate the total cost involved in the care of a defined patient population. The concept is that this unit should be integral, including all relevant services and needs to a specific episode, including diagnostic and treatment procedures, ancillary items, as well as needs following the initial treatment period, extending into follow-up care or treatment of complications that may occur from those services. An episode is a unit of an episodic group for a determined patient and clinician, within a timeline. Moreover, sub-groups can be formed to define more homogeneous patient cohorts. The CS will define clinical roles relevant to an episode based on the service being a trigger event for an episode group, or the service being considered as an assigned rule.37

Attributing the episode group to the responsible clinician(s)

When episodes are initiated, clinicians will be assigned through the TIN-NPI documented in the NPI field on the Physician/Supplier Part B. It is desirable that clinicians are aware at the time of services if they will be associated with the specific episode of care. For procedural episodes, the episode is linked to the physician executing the trigger service (CPT/HCPCS procedure codes). For acute inpatient medical condition episodes, the assignment is related to the professional responsible for billing the minimum of 30% of the inpatient evaluation and management (E&M) services during an inpatient admission with the medical Medicare Severity Diagnosis-Related Groups (MS-DRGs).37 The concept is to ensure that episodes are assigned to professionals who can meaningfully impact episode spending. Patient Relationship Codes (PRCs) are designed to more precisely detail the level of clinical engagement in the episode.47 The codes are currently in a voluntary reporting period and whether and how the codes are reported will not affect Medicare payment. During the voluntary period, CMS will be collecting data for validity and reliability testing of the codes before their potential use in the attribution methodology for cost measures. More than one physician can be responsible for the episode of the same patient, varying with their role.31 While the general concept is intuitive the precise threshold of assessing which clinician has significant influence over the medical expenditures is less clear and may be subject to further refinement based on feedback from real-world testing. It remains uncertain whether measures will be optimally assessed by enumerating encounters or evaluation and management claims.

Assigning costs to the episode group

Three types of episode groups have distinct cost metrics: procedural (specific aim such as surgery; ex; cholecystectomy or hip arthroplasty); acute inpatient medical condition (self-limited acute illness or treatment of flares/exacerbation of a condition requiring hospitalization; ex: acute myocardial infarction, gastrointestinal bleed); and chronic condition (takes into consideration patient’s previous medical history and current state of health; ex: diabetes). Initially, Acumen will work in the development of procedural and acute inpatient episode-based cost measures. Chronic conditions will only be addressed at a later stage. Five out of the eight episode groups tested are procedural episode groups, predominantly managed in outpatient and elective settings: elective outpatient PCI, knee arthroplasty, revascularization for lower extremity chronic critical limb ischemia, routine cataract removal with IOL implantation, and screening/surveillance colonoscopy. The additional three episode groups are acute inpatient groups and include intracranial hemorrhage/cerebral infarction, pneumonia with hospitalization, and STEMI with PCI. The 2017 field testing experience was used to further refine the eight initial groups, with the goal of developing cost performance category criteria.35 37

Risk-adjusting episode group costs

Episode costs are standardized and risk-adjusted.37 The standardization method is used to facilitate comparison and correct for differences related to choices related to a healthcare facility. Different costs related to geographic variations are also eliminated with standardization. Risk adjustment aims to balance factors outside of the clinician’s control that can influence spending, for example, variance associated with patient’s previous health conditions, illness severity, ages, and comorbidities which are not under a physician’s control (eg, in an elective outpatient PCI episode-based cost measure, risk adjustment model would account for a patient’s previous history of heart failure). Two different types of risk adjustment are used: standard for all of the episode-based cost measures, the CMS Hierarchical Condition Category Version 22 (CMS-HCC V22) 2016 Risk Adjustment Model; and specific risk adjustors recommended by the Clinical Subcommittees31 43 during cost measure development. By way of example, the Neuropsychiatric Subcommittee recommended the concurrent diagnosis of aphasia and dysphagia as independent risk variables for intracranial hemorrhage and cerebral infarction.

Aligning episode group costs with quality

The primary goal of this premise is to avoid low-value care.35 The quality metrics to be considered include outcomes of care, processes of care, functional status of patients, and patient experience. The hypothesis is that once cost becomes a well-established metric, it will help guide what is meant by high-value, patient-centered care. This is when the marriage of cost and quality would be ideal: cost metrics would provide accurate, clinically valid, and actionable data to providers, who then would be able to make cost-conscious choices. The TEP and the stakeholder community expressed that the aim is to align episode group costs that have similar characteristics with quality measures and patient outcomes, including nuances of functional status and mortality. As part of measure prioritization and development, analyses were conducted to determine patient cohort overlap with existing quality measures. These analyses were presented to Clinical Subcommittee members to aid in the identification of opportunities for alignment between cost and quality measures, and help guide the choice of which episode groups to develop into cost measures first. CMS is still collecting input on a plane of action into bringing together cost measures with quality.37


Neurointerventional (NI) specialists have had significant successes that are by way of example reshaping care delivery for emergent large vessel occlusion patients each day.48 Understanding cost is critical to providing value-based healthcare. One of the first obstacles is to better understand how NI specialists fit into these various scenarios. As key providers of essential elements of cerebrovascular treatment, NI specialists will likely have cost of care attributed to them even if the current attribution methodology does not capture this in every instance. Fortunately, there has been significant and explicit NI stakeholder engagement in the development of relevant episode groups.49

Cost attribution can be a remarkable challenge when one considers that a physician who is responsible for 30% of the inpatient evaluation and management services, the other 70% of the services may be out of their control. The inclusion and exclusion criteria of services to an episode remain subject to initial metrics developed by the CS and TEP. Field-testing allowed for broader feedback from various stakeholders which was then considered by the Clinical Subcommittees. Nonetheless, the political pressure and rapid changes impose a tight timeframe for this complex puzzle. The current Federal administration has given clear signs of revisiting significant parts of the previous administration’s plans and visions.50–52

Nonetheless, while cost and resource utilization are covered in this manuscript as a specific component of MIPS scoring, it is straightforward to imagine many scenarios where having a better handle on resource utilization could have a meaningful impact on performance metrics of neurointerventionalists. Thus, it is necessary for NI specialists to focus energy on these components as a discipline of practice.

Beyond MIPS and QPP, there are other opportunities for cost to impact on episodes. An example comes from the American Medical Association, which has considered expanding the current procedural terminology (CPT) code sets to include alternative payment models and/or episodes. Neurointerventionalists are familiar with the complex interplay of the CPT system, the Specialty Society RVS Update Committee (RUC), and CMS for determining specific fees for service. How that traditional FFS system might look if expanded to include APMs remains unclear.53 54 In such a circumstance, cost could be expected to be a vital factor in achieving success.

As a technologically-driven specialty, there is a perception by many of those involved in the NI endeavor that care is expensive. However, NI care is in many situations the standard of care for treatment of cerebrovascular conditions.55–57 As a result, emerging data indicate that the number of NI treatments is rising, and that trend is expected to continue. As NI services become more widespread and thus mainstream, commoditization of the devices used in the clinical space should yield savings opportunities.58 The NI literature reflects this and is increasingly recognizing the importance of cost and resource utilization.59–61

As systems of care continue to expand, it is likely that NI groups will increasingly co-exist within a single clinically integrated and/or health network. Resource utilization coupled with quality could be used to reward or penalize different members of the system. Decision-making within episodes of care could all come under the rubric of efficient utilization of resources. Examples of these types of decisions exist throughout the NI landscape and include the use of diagnostic arteriography when cheaper non-invasive options are available, use of anesthesia when moderate sedation might be appropriate, or even selecting six vessels selected in a diagnostic study when one might answer the question. Further, as episodes consider both Part A and B costs, operators who might have previously chosen interventional devices based on preference, might recognize a higher value in considering per unit or per treatment cost in the decision-making process. Moreover, as private payers adopt progressive elements of value-based methodology, understanding of costs will inure to the benefit of providers.


Neurointerventional specialists will predominantly participate in the MIPS payment pathway in the present, near, and intermediate term future. Understanding the cost performance category of MIPS is vital to succeeding in this environment. The current round of cost measures included a particular set of trigger episodes of some, but perhaps not crucial, interest to the NI community. It is of paramount importance to gain complete facility with the methodology used to proactively offer suggestions for future episodes that will be adjudicated similarly but leaves us with clinical decision room to appropriately serve our patients. Episodic care is simultaneously the method best suited for NI practice and the most likely for our specialty group to succeed.


We would like to thank Joyce Lam and Sam Bounds for reviewing this work and providing feedback on measure specifications and policy.



  • Contributors The initial draft was prepared by GS and JH. All authors reviewed the draft, provided meaningful edits, contributed to, and approved, the final version.

  • Funding The authors have not declared a specific grant for this research from any funding agency in the public, commercial, or not-for-profit sectors.

  • Competing interests JAH has consulted for Medtronic and Globus in the last 36 months – unrelated. JAH and ABR are supported by Research Grants from the Harvey L. Neiman Health Policy Institute NC and RD and both work for Acumen, LLC. This article does not express the opinions of Acumen, LLC.

  • Patient consent Not required.

  • Provenance and peer review Commissioned; internally peer reviewed.