Active vs. maintenance care
Active vs. Maintenance Chiropractic Care: The Line That Decides Whether Medicare Pays
Medicare pays for the adjustment that improves a condition, and never for the one that maintains it. The whole coverage question turns on which side of that line a visit sits.
The distinction
One clinical distinction drives nearly every Medicare chiropractic decision you make.
Medicare covers exactly one chiropractic service (manual manipulation of the spine to correct a subluxation), and even that is covered only when the care is active. The instant the same adjustment becomes maintenance, Medicare stops paying. Not because the code changed, not because the documentation got sloppy, but because the purpose of the care crossed a line. Active care aims to improve the condition; maintenance care aims to hold it. Medicare pays for the first and never for the second.
Almost every Medicare rule a chiropractor wrestles with, from the AT modifier to the denial codes to the ABN to the audit risk, is downstream of this one distinction. Get the active-vs-maintenance call right and the rest follows: the modifier is honest, the claim pays or the patient is billed cleanly, and an audit finds the chart matches the claim. Get it wrong and the same visit becomes either a denial or a compliance problem. This guide is about that line: where it sits, how the documentation proves which side you’re on, and how our billing service keeps the two tracks from blurring. For the full rulebook the line lives inside, see our chiropractic Medicare billing guide.
A general reference, not clinical or compliance advice. Whether a given visit is active or maintenance is a clinical judgment the treating provider makes and documents for a specific patient. Medicare coverage policy and your MAC’s guidance change over time. Use this guide to orient, then rely on current CMS guidance, your documentation, and your own clinical judgment. Nothing here is legal, compliance, or coding advice for a particular claim.
Active vs. maintenance
Active care improves. Maintenance care preserves. Only one is a Medicare benefit.
The distinction isn’t about how the adjustment is performed. The hands-on treatment can look identical. It’s about the clinical goal behind it and what the documentation shows. Active/corrective treatment is delivered when there’s a reasonable expectation the patient’s condition will improve; maintenance is care that prevents deterioration or supports a condition that has already plateaued.
Active / corrective treatment
- Goal is to improve the patient’s condition
- A documented subluxation and a plan of care
- Measurable goals and tracked progress
- Billed to Medicare with the AT modifier
Reasonable expectation of functional improvement is the heart of it: the chart should show the patient getting better, not just attending.
Maintenance / supportive care
- Goal is to maintain or prevent decline
- Delivered after the condition has plateaued
- No expectation of further improvement
- Billed to the patient, with an ABN on file
Valuable care, just not a covered one. The mistake isn’t providing it; it’s billing Medicare for it instead of the patient.
Documentation
The documentation decides, not the calendar, and not the patient’s comfort.
There is no fixed visit count where active care “turns into” maintenance. A patient isn’t on maintenance because they hit visit twelve, and isn’t on active care just because they still hurt. The deciding factor is whether the record shows a reasonable expectation of improvement and the measurable progress to back it. While the treatment plan is moving the patient toward goals, it’s active. Once improvement has plateaued and the care shifts to holding the patient where they are, it’s maintenance, even if the visits, the code, and the adjustment look exactly the same.
That’s why this is a clinical determination the provider documents, not a billing flag a coder sets. The note needs to substantiate the subluxation (with PART exam findings or X-ray), state a plan of care with goals you can measure, and show the patient actually progressing visit to visit. When that story is in the chart, the AT modifier is honest and the claim holds up under review. When the chart stops showing improvement, the honest read is maintenance, and the billing has to follow the chart, not the other way around.
The AT modifier
The AT modifier is the claim’s answer to one question: active, or maintenance?
Append the AT modifier (Active/Corrective Treatment) to a spinal CMT code (98940, 98941, 98942) and you’re telling Medicare the adjustment is meant to improve the condition. Leave it off and Medicare reads the visit as maintenance, and denies it. The modifier is how the line in the chart becomes a line on the claim.
The visit is active, the chart shows improvement, and the AT modifier attests it. This is the only configuration Medicare pays a chiropractor for spinal CMT.
Genuinely active care that left the AT off reads to Medicare as maintenance and denies as not medically necessary. A clerical miss with a clinical-sounding denial, and a common, avoidable one.
The trap is treating the AT modifier as a switch that makes claims pay. It isn’t: it’s a clinical attestation that has to be true. Appending AT to a visit the chart shows as maintenance is a false statement that invites recoupment and audit, not clean revenue. The modifier has to match the documentation. Keeping the two aligned is exactly what our scrubbing review checks before a claim goes out. It’s the same review that heads off the denials a missed modifier causes.
Denial codes
When the line is missed, the denial code tells you which way.
An active-vs-maintenance error doesn’t announce itself. It comes back as a denial code, and each one points at a specific failure. Read them right and the pattern is obvious: the claim said one thing, the chart said another.
Not medically necessary
Medicare read the visit as maintenance. Usually the missing AT modifier on genuinely active care, or documentation that doesn’t show the improvement active care requires.
Claim lacks information
Active care that’s missing what proves it’s active: most often the initial treatment date in Item 14, or the PART/X-ray support behind the subluxation.
Maintenance, billed right
With a signed ABN and the GA modifier, the expected maintenance denial routes to patient responsibility, not a write-off. The denial is the plan, not the problem.
The difference between the first two and the third is the whole game. CO-50 and CO-16 are active-care claims that failed; a patient-responsibility outcome on maintenance is a non-covered visit that still collected. For the full denial playbook, see why chiropractic claims get denied. The codes themselves are mapped in our CPT codes cheat sheet.
The ABN
When care becomes maintenance, the ABN turns a write-off into the patient’s bill.
Reaching a plateau isn’t a failure. It’s the expected end of an active episode, and many patients want to keep coming for the upkeep. The question is whether you can collect for it. Because maintenance care is never a Medicare benefit, you can bill the patient, but only if you handle the handoff correctly. Before delivering maintenance CMT, the practice issues an Advance Beneficiary Notice of Noncoverage (ABN, form CMS-R-131), signed before the visit, telling the patient Medicare is expected to deny the service and they may be responsible.
With that notice on file, the claim carries the GA modifier, the expected denial routes to patient responsibility, and you bill the patient cleanly. Skip the ABN on a service that needed one and you generally can’t hold the patient liable: the visit becomes a write-off. The same logic covers the other non-covered chiropractic services Medicare won’t pay: extraspinal manipulation (98943), the exam, X-rays, and therapies like 97110 and 97140 when billed by a chiropractor. The full mechanics live in our chiropractic billing guides.
Common mistakes
Four ways the active-vs-maintenance line gets crossed badly.
None of these are exotic. They’re the everyday slips that happen when the clinical line and the billing line drift apart, and a generalist biller working from a flat template repeats them on every Medicare patient.
AT to force a maintenance claim through
Appending the AT modifier to a visit the chart shows as maintenance, just to make Medicare pay. That’s a false attestation, not a fix. It invites recoupment and audit when the documentation doesn’t support active care.
No ABN before maintenance care
Delivering maintenance CMT without a signed notice first. The claim denies, and without the ABN the patient can’t be billed, so a collectible visit becomes a write-off the practice absorbs.
Calling active care “maintenance” too early
Writing off genuinely active care as maintenance because the patient has been coming a while, and never billing Medicare for visits it would have paid. The line is the documentation, not the visit count.
A chart that doesn’t show improvement
Billing active care with the AT modifier while the notes are flat: same findings, same plan, no measurable progress. On review, the care reads as maintenance and the active-care payments are at risk of recoupment.
The pattern under all four: the claim and the chart told different stories. Keep them aligned (AT only when the note supports active care, ABN and GA the moment it’s maintenance) and the practice stays both paid and compliant. That alignment is the entire job, and it’s where a chiropractic specialist earns the difference over a generalist.
How we handle it
Every Medicare visit gets sorted to the right track, before the claim goes out.
Active care to Medicare with the AT modifier and full documentation; maintenance to the patient with the ABN and the GA modifier. We scrub each chiropractic Medicare claim against exactly that fork, so the payable visits pay and the non-covered ones still collect, instead of one quietly becoming a denial and the other a write-off.
And it’s consultative, not just defensive. Many of our clients run multi-specialty centers, so the same coordinator also handles the therapy (97110, 97140), massage, acupuncture, and nurse-practitioner visits under your roof, routing each to the right payer with the Medicare exclusions applied correctly across all of them. We work inside any EHR, so none of this means switching software. It’s all one flat fee, laid out on our pricing page.
Proof
The discipline shows up in the collections.
“In practice over 30 years, I have never found a more professional, knowledgeable company. I have a dedicated person accessible at all times, and they’re compatible with my EHR so I have no extra steps.”
“ACB has been instrumental in cleaning up our accounts receivable, helping us transition between software, and staying on top of all our billing. Knowledgeable, and most importantly, effective.”
“I used to spend a lot of time calling insurance companies when claims weren’t paid. Now they’re part of my team, so I can focus on patient care. Highly recommend.”
FAQ
Active vs. maintenance care, answered.
Active (or corrective) care is treatment delivered with a reasonable expectation of improving the patient’s condition, supported by a documented subluxation, a plan of care with measurable goals, and tracked progress. Maintenance care is delivered after the condition has plateaued, to prevent deterioration or hold the patient where they are, with no expectation of further improvement. The adjustment can look identical. The difference is the clinical goal and what the documentation shows. Medicare covers active spinal CMT and never covers maintenance.
No. Maintenance care is never a Medicare benefit, regardless of how valuable it is for the patient. You can still provide it (and you can bill the patient for it) but only if you issue an Advance Beneficiary Notice of Noncoverage (ABN, form CMS-R-131) before the visit and report the claim with the GA modifier so the expected denial routes to patient responsibility. Without that signed notice, you generally can’t hold the patient responsible, and the visit becomes a write-off.
There’s no fixed number. Care isn’t maintenance because a patient hit a certain visit count, and it isn’t active just because they still have symptoms. The deciding factor is whether the documentation shows a reasonable expectation of improvement and measurable progress toward the goals in the plan of care. While the patient is improving, it’s active; once improvement has plateaued and the care shifts to holding them steady, it’s maintenance, even if the code and the adjustment are unchanged.
No. The AT modifier attests that the manipulation is active, corrective care intended to improve the patient’s condition. Applying it to a visit that is genuinely maintenance, just to keep Medicare paying, is a false attestation. It invites recoupment and audit, not clean revenue. The compliant path when care becomes maintenance is the opposite: drop the AT, get the ABN signed before the visit, append the GA modifier, and bill the patient. The AT modifier has to match what the chart supports.
CO-50 means Medicare deemed the service not medically necessary, and on a chiropractic CMT claim that almost always means it read the visit as maintenance. The most common cause is a missing AT modifier on genuinely active care; the other is documentation that doesn’t demonstrate the improvement active care requires. The fix is to make sure active visits carry the AT modifier and that the chart substantiates the subluxation and shows progress. We verify both on every claim before it’s submitted.
The note needs to substantiate the subluxation (with PART exam findings or an X-ray), state the precise level treated, and tie it to a plan of care with goals you can measure. Then it has to show the patient actually progressing toward those goals visit to visit, along with the initial treatment date that anchors the episode. When that story is in the chart, the AT modifier is honest and the claim holds up under review. When the notes go flat and stop showing improvement, the honest read is maintenance, and the billing should follow the chart.
Pricing
All of this, for 7% of net collections.
The active-vs-maintenance sort on every Medicare patient, the AT-and-documentation review on every CMT claim, the ABN-and-GA discipline on the maintenance ones, denials and appeals, your dedicated coordinator, and the consultative revenue work: it’s all included in one performance-based fee: 7% of net collections, or a $1,500/month minimum, whichever is greater. All-inclusive, month-to-month, no contract. See the full breakdown and run the numbers on our pricing page.
Official sources
Where these rules come from
Medicare’s active-vs-maintenance distinction on this page is drawn from these primary CMS sources. Documentation and medical-necessity rules change, so confirm the current requirement before billing.
- CMS Billing & Coding: Chiropractic Services (A56273)
- CMS Local Coverage Determination: Chiropractic Services (L37254)
- Medicare.gov: Chiropractic services coverage
Billing rules also vary by state. See our state-by-state chiropractic billing guides. Each covers the local auto-injury, Workers’ Comp and Medicaid rules, cited to the governing statute.
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