The 2026 Medicare ABN Change Most Chiropractic Practices Missed

If your front desk is still handing patients an Advance Beneficiary Notice from an old template, there's a compliance gap worth checking this week — one that only shows up the moment a claim gets denied and you try to collect from the patient instead.

The Office of Management and Budget renewed its approval of the Advance Beneficiary Notice of Noncoverage, form CMS-R-131, on March 13, 2026, with the new approval valid through March 31, 2029 (Illinois Chiropractic Society). Use of the updated form became mandatory on May 12, 2026 (Noridian). ABNs issued on the old version of the form on or after May 13, 2026 may not hold up — which means if Medicare denies the claim, the practice may not be able to bill the patient for it and eats the cost instead (Illinois Chiropractic Society).

For most specialties, that's a paperwork update. For chiropractic, it's a bigger deal, because chiropractors issue ABNs more routinely than almost any other provider type. Here's the change, and a five-step check worth running before your next maintenance-care visit.

What Changed (and When)

CMS didn't change the underlying ABN rules — when you need one, what it has to say, or who has to sign it. What changed is the approved version of the form. As of July 2026, three dates matter:

• March 13, 2026 — OMB approves the renewed CMS-R-131 form, valid through March 31, 2029 (Illinois Chiropractic Society).
• May 12, 2026 — the deadline for fully transitioning to the current version (Noridian).
• May 13, 2026 onward — ABNs issued on the old form are at risk of being treated as invalid (Illinois Chiropractic Society).

The form also applies to Medicare Part B, fee-for-service claims only. It is not used for Medicare Advantage plans, which have their own non-coverage notice requirements (Illinois Chiropractic Society).

Why This Hits Chiropractors Harder Than Most

Medicare Part B covers exactly one chiropractic service: manual manipulation of the spine to correct a subluxation, billed with the AT modifier to signal active or corrective treatment (see our Medicare documentation guide for the full coverage rules). The moment a patient's care shifts from active treatment to maintenance — preserving function rather than improving it — that Medicare coverage ends.

Medicare doesn't stop you from continuing to treat a patient in maintenance care. It requires you to tell them, in writing and in advance, that Medicare won't pay for it and they will. That's the ABN. On the claim itself, the GA modifier is what tells Medicare a signed ABN is on file for that specific service — practices are instructed not to bill the AT and GA modifiers on the same code, since AT signals active, covered treatment and GA signals the opposite (Noridian). Skip the ABN, or have it on an invalid form, and the GA modifier has nothing behind it — you can't shift the liability to the patient after the fact.

Because so much chiropractic care legitimately transitions to maintenance at some point in a treatment plan, most practices are issuing ABNs on a regular, recurring basis, not as a rare exception. That's what makes this form change worth an actual practice-wide check rather than a "we'll get to it" item.

What You Risk With an Old-Form ABN

An ABN exists to do one job: shift financial liability from the practice to the patient, in advance, for a service Medicare is expected to deny. If the ABN itself isn't valid — wrong form, missing required elements, not properly executed — that protection doesn't exist. In practice, that means:

• Medicare denies the maintenance-care claim, as expected.
• You can't collect from the patient, because the notice they signed wasn't a valid ABN.
• The visit becomes a write-off instead of a billable one.

Unlike audit exposure that surfaces months down the road, this is a same-visit problem: the ABN either protects you at the time of service or it doesn't.

Your 5-Step ABN Compliance Check

Frequently Asked Questions

What is the new 2026 Medicare ABN form?

It's the same form CMS-R-131 — the standard Advance Beneficiary Notice of Noncoverage — under a renewed OMB approval issued March 13, 2026 and valid through March 31, 2029 (Illinois Chiropractic Society). The version your practice must now use is the one carrying that March 31, 2029 expiration date. The underlying rules for when you need an ABN did not change.

Is the old ABN form still valid?

Not reliably, as of May 13, 2026. CMS required practices to fully transition to the updated form by May 12, 2026 (Noridian). ABNs signed on the old version after that date may not be considered valid, which affects your ability to bill the patient if Medicare denies the claim.

Does this apply to Medicare Advantage patients?

No. The ABN form applies to Original Medicare, Part B, fee-for-service claims only — it isn't used for Medicare Advantage plans (Illinois Chiropractic Society).

How does this connect to the AT and GA modifiers on chiropractic claims?

AT signals active or corrective treatment, which Medicare covers. Once care becomes maintenance, Medicare no longer covers it — billing that visit to the patient requires both a validly signed ABN and the GA modifier on the claim (Noridian). An invalid ABN breaks that chain even when the GA modifier is applied correctly.

How do I know for sure which ABN form I'm using?

Download a fresh copy from CMS's Beneficiary Notices Initiative / FFS ABN page (CMS.gov) — the only authoritative source for the current version — and check the expiration date printed on the form. If you're unsure, the safest move is to replace every copy in your practice with the freshly downloaded version rather than trying to verify an existing template.

Where This Fits Into Your Broader Compliance Picture

ChiroScribe doesn't generate or manage ABNs — that's a front-desk and billing workflow, not a documentation one. But the same instinct that has you double-checking your ABN stock this month is worth pointing at your clinical notes too. If a maintenance-care claim is ever questioned, the ABN is what protects your ability to bill the patient — but your SOAP notes are what show the visit was clinically justified and consistent with how you documented the transition from active to maintenance care in the first place.

Practices using ChiroScribe get a published average note time of 126 seconds across 2,147 SOAP notes, with consistent structure on every visit — useful when you need to spot-check documentation quickly rather than dig through years of inconsistent notes. If you're already auditing your ABN stock this week, it's a reasonable moment to run the same eye over your last several charted maintenance-care visits using our SOAP note audit checklist.

This article is for general educational purposes and reflects our understanding of CMS guidance as of July 2026. It is not legal or billing advice. ABN requirements can involve MAC-specific and case-specific detail — confirm current requirements with your Medicare Administrative Contractor or a compliance professional before changing your practice's ABN process.

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