The Physicians Sending You Referrals Just Got a Price Tag Put on Conservative Care

A closer look at the Ambulatory Specialty Model’s low back pain cohort — and why the next eighteen months are the best opening PT/OT has had in years to become the partner spine and pain practices can’t afford to skip.

Key takeaways

CMS’s Ambulatory Specialty Model (ASM) is a new mandatory Medicare payment model launching January 1, 2027, tying physician pay to cost and quality performance on two conditions: heart failure and low back pain.
4,027 clinicians — orthopedic surgeons, PM&R physicians, pain management, anesthesiology, interventional pain, and neurosurgery — are mandatory ASM participants for low back pain, with roughly $95.8 million in aggregate Medicare payment at risk.
Physical therapists and occupational therapists are not included as ASM participants, but the model’s scoring rewards the physicians who refer to us — creating a financial (not just clinical) incentive for spine and pain practices to lean on conservative-first PT/OT referral pathways.
ASM scores functional outcomes (Oswestry/PROMIS), lumbar MRI utilization attributed across the whole care team, and episode cost — all areas where a strong PT/OT partnership directly helps a referring physician’s score.
PT/OT practices that standardize on Oswestry/PROMIS and build fast, data-sharing referral relationships with ASM-designated practices now have a measurable edge before the model launches.

A few days ago I wrote about the Ambulatory Specialty Model (ASM) from the outside — CMS’s new mandatory specialist accountability model, launching in 2027 with low back pain as one of its two condition tracks, and PT explicitly left out of it. A recent deep-dive from orthopedic surgeon and health-tech founder Christian Peán on Techy Surgeon put real numbers behind the model, and those numbers change the story. This isn’t just about who CMS left out. It’s about what CMS just did to the financial incentives of everyone still in the room — and what that means for how those practices are going to need to treat, refer, and document starting January 1, 2027.

Who’s actually in this, and what’s on the line

ASM’s low back pain cohort is 4,027 clinicians: 969 in physical medicine and rehab, 943 in orthopedic surgery, 727 in pain management, 598 in anesthesiology, 458 in interventional pain, and 321 in neurosurgery. There’s no opting out. If CMS selected your NPI off the preliminary list, you’re in when the model starts, and you stay in through 2031.

The mechanism is a withhold-and-redistribute pool. CMS puts a share of every participant’s Part B payments at risk, scores each clinician against every other specialist treating the same condition, and moves money from the bottom of that distribution to the top — after keeping 15% off the top for the Medicare Trust Fund regardless of clinical outcomes. Peán’s analysis, cross-referencing the preliminary participant list against the Medicare Part B Public Use File, puts aggregate exposure for the low back pain cohort at roughly $95.8 million, with average per-provider exposure around $23,800 and 50 providers facing six-figure swings. The adjustment starts at ±9% in 2027 and climbs to ±12% by 2031.

What they’re actually being scored on

This is the part that matters for us. Scoring is half quality, half cost, and both halves point the same direction: toward exactly the kind of care PT and OT already deliver.

A rebuilt functional status measure. The original measure CMS finalized (MIPS Q220) is being retired because its steward stopped maintaining it. Its replacement, Q182, accepts the Modified Oswestry Disability Index or PROMIS — instruments most PT and OT practices already use in daily practice.
A new imaging-appropriateness measure. CMS is adding an administrative claims measure tracking lumbar MRI utilization, calculated automatically from claims with no provider reporting required. The mechanics are worth sitting with: the MRI gets attributed to every clinician who furnished qualifying care to that patient in the prior 365 days — not just whoever ordered it. A scan one specialist orders can land on a colleague’s scorecard.
A direct bonus for collecting patient-reported outcomes. Practices that voluntarily submit beneficiary-level PRO data — PROMIS is the named preferred instrument — get 5 points added straight to their quality score, on top of whatever functional-status score that data also feeds.
Cost measured as episode spend against the cohort median. Hospitalizations, ED visits, referrals, imaging, procedures — all of it counted against a physician managing that patient’s back pain episode.

Put plainly: for the first time, a large cohort of the physicians who see MSK patients before we ever do is being financially rewarded for functional-outcome tracking and conservative-first management, and financially penalized for early imaging and rapid procedural conversion. That’s not a guideline anymore. That’s their P&L.

Why this is an opening, not just a threat

Read that measure set again from where we sit. A spine surgeon or pain physician in this cohort now needs, structurally, exactly three things to protect their score: a way to demonstrate functional improvement using Oswestry or PROMIS, a way to keep episode costs down relative to peers, and a defensible conservative-care pathway they can point to before imaging or intervention. That is precisely what a strong PT/OT relationship provides — if we show up as a partner who can deliver it reliably and prove it with data.

Consider the mechanics that make this more than a talking point:

The MRI attribution rule cuts against reflexive imaging for the whole care team, not just the ordering physician. A practice with a fast, trusted conservative-care referral pathway has a real, scoreable reason to lean on it before imaging — not just a clinical preference, but a financial one.
The functional-outcome measure rewards whoever can produce clean Oswestry or PROMIS data on a patient’s trajectory. If your practice already administers these instruments consistently, you’re sitting on exactly the data these physicians need fed back to them — and a referral relationship where that data flows smoothly back to the referring physician is worth more to them under ASM than it was a year ago.
The PRO collection bonus is a direct incentive for physicians to build data infrastructure they mostly don’t have. Practices that already run structured PRO collection as part of a rehab episode have a natural pitch: we can help you close that gap, because we’re already doing it.

None of this requires us to be in the model. It requires the physicians in the model to see us as the fastest, most measurable way to protect their score. That’s a different ask than “please refer to PT because it’s evidence-based.” It’s “referring to PT protects your Medicare payment,” and for the first time that’s true in a way you can show a practice administrator with a number.

The catch — and it’s a real one

ASM’s Collaborative Care Arrangement (CCA), the formal agreement structure the model requires for care coordination credit, is built for primary care partnerships, not PT or OT. There’s no equivalent structure that gives us formal standing in this model, and nothing in the proposed rule changes that. We’re not going to get pulled into ASM’s scoring — this isn’t a backdoor into the model. What we can get is something more immediately useful: a stronger, more evidence-backed case for why a spine or pain practice should route patients to us early, fast, and often, because their own scorecard now depends on it.

That only works if we can actually deliver the data. If your practice isn’t administering Oswestry or PROMIS consistently, or doesn’t have a clean way to report functional trajectory back to a referring physician, this opportunity closes as fast as it opened. The model rewards whoever moves first — Peán’s piece makes this point about the physicians themselves, and it’s just as true for the practices trying to become their partner of choice. Early movers set the benchmark everyone else gets measured against.

What to actually do before January 1, 2027

Confirm your outcome measures match theirs. If you’re not already using Oswestry or PROMIS consistently for spine-adjacent MSK cases, standardize on one now. Being able to hand a referring physician clean, comparable functional data is the whole value proposition here.
Find out who’s actually in this cohort in your market. techypolicy.com, built by the author of the Techy Surgeon piece, lets you look up ASM-designated NPIs and their financial exposure. If a spine surgeon or pain practice you already refer with is on that list, that relationship just became a lot more valuable to them than it was six months ago — and they may not know it yet.
Build the pitch, not just the relationship. Go into those conversations able to say, specifically, how fast you can get a patient in, what data you’ll send back, and how often. “We do good work” isn’t the pitch anymore. “We can help protect your score” is.
Watch the comment period. The proposed rule is open for comment on several operational details — including the MRI attribution mechanics and case-count minimums — through the standard 60-day window. If you have a view on how imaging attribution or referral timing should work, this is the moment CMS is actually asking.

Where this fits with what I’ve said before

This connects directly to the piece I wrote on the CY 2027 fee schedule more broadly, and to a question I keep coming back to on the show: whether we can think in panels of patients and populations, not just visits. ASM doesn’t hand us that seat. But it just gave the physicians who do have a seat a direct financial reason to need us more than they did last year — and that’s an opening worth being ready for, not a footnote to file away until the next rule drops.

Frequently Asked Questions

What is the Ambulatory Specialty Model (ASM)? ASM is a mandatory Medicare payment model from CMS that adjusts physician Part B payments up or down based on cost and quality performance for two conditions: heart failure and low back pain. It starts January 1, 2027, and runs through 2031.
Does the Ambulatory Specialty Model include physical therapists or occupational therapists? No. ASM’s low back pain cohort is limited to orthopedic surgery, physical medicine and rehabilitation, pain management, anesthesiology, interventional pain management, and neurosurgery. PT and OT are not mandatory participants and have no formal role in the model’s scoring.
How does ASM affect PT and OT referrals? ASM scores participating physicians on functional outcomes (using the Oswestry Disability Index or PROMIS), lumbar MRI utilization attributed across the full care team, and total episode cost. Physicians who refer early to conservative-first PT/OT care have a structural, scoreable reason to do so, since it can improve their functional-outcome data, reduce imaging attributed to them, and lower episode cost.
Which specialties are mandatory ASM participants for low back pain? CMS’s preliminary list includes 969 PM&R physicians, 943 orthopedic surgeons, 727 pain management physicians, 598 anesthesiologists, 458 interventional pain physicians, and 321 neurosurgeons — 4,027 clinicians total, with no ability to opt out once selected.
When does the Ambulatory Specialty Model start? ASM launches January 1, 2027. Payment adjustments begin at plus or minus 9% of Part B revenue and increase to plus or minus 12% by 2031.
What outcome measures does ASM use for low back pain? ASM’s low back pain track uses a functional status measure (Q182) that accepts the Modified Oswestry Disability Index or PROMIS, an administrative claims-based lumbar MRI utilization measure, and episode cost measured against the cohort median.

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