The Ambulatory Specialty Model 2027 List Is Out, and Nobody Volunteered For It

The Centers for Medicare & Medicaid Services published the final participant list for the Ambulatory Specialty Model 2027 performance year this week, announced in the MLN Connects newsletter dated 17 September 2026. The Ambulatory Specialty Model, abbreviated ASM, is run by the CMS Innovation Center. Participation is mandatory. Specialists who meet the eligibility criteria are required to participate and to meet all model requirements for each performance year, with limited exceptions. The first performance year opens on 1 January 2027.

No practice applies to this model, and no practice is asked. Selection is made on three criteria together. The specialist must frequently care for people with low back pain or heart failure. The practice must sit inside a selected core-based statistical area or metropolitan division, which covers roughly one quarter of core-based statistical areas. And the specialist must have historically been attributed at least 20 Original Medicare episodes of heart failure, or at least 20 Original Medicare episodes of low back pain, over a twelve-month period.

The specialties in scope are fixed. Low back pain draws in anesthesiology, pain management, interventional pain management, neurosurgery, orthopedic surgery, and physical medicine and rehabilitation. Heart failure draws in cardiology. A practice that sits in one of those specialties, in one of those areas, above that volume, is in the model whether or not anyone inside it has heard of the model.

What the Ambulatory Specialty Model 2027 Means for an Independent US Medical Practice

Payment moves through a two-sided risk arrangement. The adjustment runs from minus 9 per cent to plus 9 per cent in the first two performance years, and widens to minus 12 per cent to plus 12 per cent by the final performance year. It applies to future Medicare Part B payments. The performance years run from 1 January 2027 through 31 December 2031. The payment years run from 1 January 2029 through 31 December 2033.

That two-year gap is the part that gets misread. The year that decides a 2029 adjustment is 2027, and 2027 begins in a little over three months. A practice that discovers its selection in 2028 does not get a shorter performance year. It gets a full year that has already been scored, on data it was not capturing at the time.

Scoring runs in four categories: quality, cost, care improvement activities, and improving interoperability. The model covers Original Medicare only. It also expects collaborative arrangements with primary care, health information exchange and data sharing, preventive care screening, and support for lifestyle changes and health-related social needs screening. CMS states the aims as detecting the risks and signs of chronic conditions early, preventing chronic conditions from worsening, improving the experience of care, and reducing unnecessary procedures and surgeries.

This is the second CMS move this month that turns on the line between Original Medicare and Medicare Advantage. The first was the ACCESS Model expansion, covered in our note on chronic care referrals from spring 2027.

The Operational Action to Take This Quarter

First, check the list instead of waiting to be told. CMS publishes the Ambulatory Specialty Model Participants dataset on data.cms.gov. Run the practice's own billing identifiers against it today. Correspondence may follow, but the dataset is already public, and three months is not long enough to start reacting to post.

Second, split the Medicare population. Only Original Medicare counts toward this model. A practice that cannot separate Original Medicare from Medicare Advantage inside its own reporting cannot size what is at stake, and cannot check the twenty-episode threshold that put it on the list in the first place.

Third, name an owner for each of the four scoring categories before 1 January 2027, and decide where the data will be captured. Quality, cost, care improvement activities and improving interoperability cannot be reconstructed in 2028 out of a year of notes that were never structured for them. The capture has to be running on the first day of the performance year, not discovered in the second.

Fourth, put the ASM office hour in the diary. CMS is holding a virtual session on 30 September 2026, from 1 to 2 pm Eastern.

How VOSKPO Helps

The work this model creates in the first year is revenue-cycle work, not clinical work. It is knowing who is in the Original Medicare population and who is not, holding a clean record of the encounters that make up an episode, and being able to produce that record on demand two years after the fact.

VOSKPO provides medical billing, coding support, and accounts receivable follow-up as one operation rather than three, which is what makes a population reportable rather than merely billed. Our denial management work exists to keep the same record defensible when a payer questions it, and accounts receivable follow-up keeps the encounters that make up an episode from ageing quietly out of view. Credentialing, payer enrollment and payer contracting keep the identifiers a practice is selected on accurate in the first place. For practices building this capability from a standing start, the Practice Incubator is the route in.

How KPO Support Helps

A model that runs for five performance years will change during them. Knowledge process outsourcing is the layer that keeps a change at the source from staying at the source: a CMS update becomes a revised work instruction, and a revised work instruction becomes training the people doing the work have actually had.

That matters more here than in ordinary billing, because the thing being scored is consistency across a full year. A practice does not find out it drifted until the year is closed and the score is fixed.