The Ambulatory Specialty Model for Heart Failure: What Every General Cardiologist Needs to Know Now
CMS has finalized a mandatory, individual-level payment model that ties general cardiologists' Medicare reimbursement to heart failure outcomes and costs starting in 2027 — here's what's confirmed, what's still unsettled, and how to prepare.
The Ambulatory Specialty Model (ASM) is a new five-year, mandatory payment model finalized by the Centers for Medicare and Medicaid Services (CMS) as part of the CY2026 Medicare Physician Fee Schedule final rule.
Unlike the voluntary demonstration projects cardiologists may be used to, this one carries no opt-out for clinicians who meet its criteria.
It targets two of Original Medicare's costliest chronic conditions — heart failure and low back pain — and for the heart failure cohort, it applies specifically to general cardiology.
Performance years run from January 1, 2027 through December 31, 2031, with corresponding payment adjustments landing in 2029 through 2033.
The model builds on the MIPS Value Pathways framework but exempts participants from standard MIPS reporting and instead measures them, individually, against same-specialty peers in their region.
Who Actually Lands on the List
Eligibility is determined by four criteria: billing under the Medicare Physician Fee Schedule, a specialty designation of general cardiology based on the plurality of Part B claims, practicing within one of the selected mandatory geographic areas, and historically treating at least 20 original Medicare heart failure episodes per year, as defined by the episode-based cost measure.
CMS selected 235 core-based statistical areas or metropolitan divisions spanning 47 states for mandatory participation.
Interventional cardiologists, electrophysiologists, advanced heart failure and transplant cardiologists, adult congenital heart disease specialists, and advanced practice providers are explicitly excluded from the heart failure cohort.
That exclusion sounds clean on paper, but specialty type is assigned by claims plurality rather than board certification, and early implementation reporting has flagged that some interventional cardiologists and electrophysiologists have still surfaced on preliminary lists because of coding or classification mismatches.
Participation and reporting happen at the individual clinician level (TIN/NPI), not the practice or health system level, and eligibility is reassessed every year using claims data from two years prior.
| Criterion | Detail |
|---|---|
| Included specialty | General cardiology, per PECOS enrollment and plurality of Part B claims |
| Excluded specialties | Interventional cardiology, electrophysiology, advanced HF/transplant cardiology, adult congenital heart disease, APPs |
| Volume threshold | ≥ 20 attributed Medicare HF episodes per year |
| Geographic scope | 235 selected CBSAs/metropolitan divisions across 47 states |
| Reporting level | Individual clinician (TIN/NPI); small practices (≤15 clinicians) may report quality data at the group level |
| Eligibility review | Reassessed annually using claims data from two years prior |
How Performance Is Scored
ASM mirrors the four MIPS Value Pathways categories, but the weighting is unforgiving: Quality counts for 50% of the final score and Cost counts for the other 50%.
Improvement Activities and Promoting Interoperability don't add to the score; instead they can only subtract, up to 20 points and 10 points respectively, if requirements aren't met.
The cost measure draws on the existing heart failure episode-based cost measure, which sweeps in emergency department visits, inpatient medical and surgical stays, post-acute care (including a 30-day skilled nursing window), outpatient and clinician services, durable medical equipment, and Part D drug spending.
Patient attribution is set at the TIN-NPI level: an episode is attributed to any clinician who billed at least 30% of the trigger or confirming codes on Part B claims during that episode, with additional checks layered on top.
That attribution mechanic is one of the American College of Cardiology's sharpest concerns, since heart failure care is delivered by multidisciplinary teams, yet the financial accountability lands on one named cardiologist.
The Five Quality Measures — and a Real Reporting Gap
ASM heart failure participants are scored on five measures, all carried over from existing MIPS specifications: risk-standardized unplanned cardiovascular admissions, beta-blocker therapy for reduced ejection fraction, ACE inhibitor/ARB/ARNI therapy for reduced ejection fraction, controlling high blood pressure, and functional status assessment.
Recent Quality Payment Program experience data shows a wide gap in how consistently cardiologists already report these measures, and that gap matters because the functional status measure is the closest thing ASM has to a patient-reported outcome.
| Measure | Collection Type | Reporters (of ~15K CV specialists) | Avg. Score |
|---|---|---|---|
| Controlling High Blood Pressure (#236) | eCQM / MIPS CQM | 10,831 | 8.14 |
| Risk-Standardized Unplanned CV Admissions for HF (#492) | Claims | 7,817 | 5.34 |
| ACEi/ARB/ARNI Therapy for LVSD (#005) | eCQM / MIPS CQM | 1,197 | 8.27 |
| Beta-Blocker Therapy for LVSD (#008) | eCQM / MIPS CQM | 1,008 | 8.20 |
| Functional Status Assessments for HF (#377) | eCQM | 8 | 3.00 |
Patient-Reported Outcomes Carry a Hidden Cost
CMS has signaled interest in layering a validated patient-reported outcome measure onto the functional status category, most likely the Kansas City Cardiomyopathy Questionnaire or the Minnesota Living With Heart Failure Questionnaire.
Both instruments require a paid license for clinical use, and the ACC has specifically flagged that licensing cost, along with inconsistent EHR-versus-registry data capture, as an unresolved barrier before any such measure is added.
Practices that wait until 2027 to sort out licensing and workflow will be doing so under live financial risk rather than during a planning period.
The Financial Mechanics
ASM uses a two-sided risk arrangement: a participant's final score, compared against same-cohort peers in the same region, produces a positive, neutral, or negative adjustment applied to all of that physician's Medicare Part B claims — not just heart failure visits.
CMS funds the incentive pool through small, broad reductions to Part B payments, estimated at roughly 1.35% in the first two performance years and rising to 1.5–1.8% by years three through five.
The adjustment range itself runs from -9% to +9% in the earliest applicable payment years, with the spread widening in later years of the model.
Because ASM uses a relative, "tournament-style" scoring design rather than a fixed threshold, the ACC has pointed out that roughly half of participating cardiologists are mathematically destined for a negative adjustment regardless of whether their own care quality or costs actually improved.
The College's comment letter to CMS asked for a defined performance floor, similar to the MIPS performance threshold, so clinicians have a target they can hit to avoid penalty rather than chasing a moving, peer-relative bar.
Required Improvement Activities
Every ASM participant must attest to completing two specific improvement activities to avoid a score reduction: connecting patients to primary care while completing a health-related social needs screening, and establishing a formal collaborative care arrangement with primary care that defines roles, data sharing, and referral processes.
Both activities are reported at the practice (TIN) level rather than individually, which somewhat eases the documentation burden compared with quality reporting.
Cardiologists without an existing structured referral and co-management relationship with their primary care partners will need to build one before the 2027 data collection period opens.
A general cardiologist practices in a mid-sized metropolitan area that CMS has designated a mandatory ASM geographic area, and her panel includes roughly 140 patients with heart failure with reduced ejection fraction.
After hearing colleagues discuss the model at a regional meeting, she checks the CMS participant dataset and confirms she is listed for the 2027 performance year.
Her EHR captures beta-blocker and ACE inhibitor/ARB/ARNI prescribing reasonably well, but it has no structured field for functional status assessment, and her practice has never licensed the Kansas City Cardiomyopathy Questionnaire.
She also realizes there is no written collaborative care arrangement with the three primary care groups who refer most of her heart failure patients.
With roughly six months before data collection begins, she assembles a small implementation team to license a functional status tool, configure EHR capture for the five ASM quality measures, and draft a collaborative care agreement with her primary care partners.
A Readiness Checklist
- Confirm participant status directly through the CMS ASM participant dataset rather than assuming exclusion based on subspecialty.
- Audit EHR capability to capture and submit all five required quality measures, with particular attention to functional status documentation.
- Evaluate and budget for licensing a validated functional status instrument before it becomes a scored requirement.
- Review any existing accountable care organization relationships for "shadow bundle" cost data that can preview likely ASM cost performance.
- Draft and formalize a collaborative care arrangement with primary care partners to satisfy both required improvement activities.
- Assemble a practice-level implementation team spanning physicians, quality staff, and administrative leadership well before January 2027.
What Remains Unresolved
The CMS FAQ confirms the broad mechanics of scoring and reporting, but several operational details — including final benchmarks, the exact exchange function used to convert scores into payment adjustments, and how specialty misclassification will be corrected — are still being finalized ahead of the July 2026 final participant list.
The ACC has continued to press CMS on attribution fairness, the lack of a fixed performance threshold, and the model's individual-level focus in a field built on team-based care.
Specialty societies, including the American Society of Nuclear Cardiology, are separately surveying members to understand how broadly the model reaches beyond core general cardiology practices.
If you bill general cardiology and treat 20 or more Medicare heart failure patients a year in a major metropolitan area, assume you are on the ASM list until the CMS dataset tells you otherwise.
The financial exposure is real and broad: a negative score swings all of your Part B reimbursement, not just heart-failure-related billing, and the model offers no opt-out and, currently, no guaranteed safe score.
Start now on functional-status tooling, EHR data capture, and a written primary care collaborative agreement — the 2027 data collection clock does not wait for practice readiness.
References
- Centers for Medicare and Medicaid Services. ASM (Ambulatory Specialty Model).
- Centers for Medicare and Medicaid Services. ASM Frequently Asked Questions.
- Centers for Medicare and Medicaid Services. ASM Model Overview Fact Sheet (PDF).
- American College of Cardiology. Ambulatory Specialty Model For Heart Failure.
- American College of Cardiology. Comment Letter on the CY2026 Medicare Physician Fee Schedule Proposed Rule (PDF).
- American Society of Nuclear Cardiology. CMS Names Physicians Required to Participate in New Heart Failure Payment Model.
- Centers for Medicare and Medicaid Services, Quality Payment Program. MIPS Value Pathways.
- Centers for Medicare and Medicaid Services. ASM Participants Dataset.
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