Medicare Chiropractic Billing Compliance 2026: What Independent Practices Need to Know

If you're an independent chiropractor billing Medicare Part B, 2026 is not the year to be behind on compliance. The Office of Inspector General (OIG) has chiropractic billing on its active Work Plan for improper payments — and enforcement activity is accelerating, not slowing down.

This guide covers everything an independent chiropractic practice needs to know about Medicare billing compliance in 2026: the codes under scrutiny, the documentation standards that are tripping up audits, and the specific steps you can take right now to protect your practice.

Why Medicare Is Scrutinizing Chiropractic Billing More Than Ever

Chiropractic has one of the highest rates of improper Medicare payments of any specialty. Multiple OIG audit cycles have identified hundreds of millions of dollars in payments for chiropractic services that didn't meet Medicare's coverage requirements.

The core problem isn't that chiropractors are doing bad work — it's that Medicare's documentation requirements for chiropractic are unusually specific, and they change. What was acceptable documentation two years ago may not pass a probe audit today.

For independent practices — solo DCs or small groups without dedicated billing compliance staff — the risk is amplified. There's no compliance officer reviewing claims before submission. There's no internal audit function catching documentation gaps. It's just you, your billing software, and whatever you learned in school about Medicare documentation.

The Three Documentation Areas Medicare Audits Focus On

1. The AT Modifier

The AT modifier signals to Medicare that you're providing active/corrective care — not maintenance therapy, which Medicare doesn't cover. Every chiropractic claim for spinal manipulation (CPT 98940, 98941, 98942) that you want Medicare to pay requires the AT modifier.

But applying the AT modifier isn't enough. Your documentation has to support the AT modifier. That means your SOAP notes must demonstrate:

• That the patient has a condition reasonably expected to improve with treatment
• That the patient is actually improving (or that you have a documented reason why improvement is slower)
• That the care you're providing is active/corrective, not maintenance

Medicare auditors look for SOAP notes where the AT modifier is applied but the documentation tells a different story — a patient who has plateaued, no documented functional improvement, or language that suggests the patient is being seen for maintenance of a chronic condition.

2. Subluxation Documentation

Medicare covers chiropractic services only for the treatment of subluxation. That means every claim needs to document:

• The level(s) of subluxation (e.g., C3-C4, L4-L5)
• Associated clinical findings — pain, restricted range of motion, muscle spasm, or other objective findings
• Functional limitation — how the subluxation affects the patient's daily activities
• Measurable improvement or expected improvement with continued care

Generic SOAP notes that say "patient presents with lower back pain, adjusted L4-L5" don't cut it in a probe audit. Medicare wants specifics: what are the objective findings, how is the patient functionally limited, and how has that changed since the last visit?

3. Active vs. Maintenance Therapy

This is the biggest source of chiropractic Medicare violations. Medicare covers active/corrective care — treatment aimed at improving a patient's condition. It does not cover maintenance therapy — treatment aimed at preventing deterioration of a stable condition.

The line between active and maintenance therapy is often genuinely unclear. A patient with chronic spinal stenosis may need ongoing adjustments. Whether those adjustments are "active care" or "maintenance care" depends on documentation — specifically, whether there's evidence that the patient's condition is still responding to treatment.

The CPT Codes Under the Microscope

Medicare covers three spinal manipulation CPT codes for chiropractors:

• 98940 — Spinal manipulation, 1–2 regions. The lowest complexity level, typically for straightforward cases.
• 98941 — Spinal manipulation, 3–4 regions. Requires documentation supporting treatment of multiple spinal regions.
• 98942 — Spinal manipulation, 5 regions. Requires documentation for all five spinal regions.

Upcoding — billing 98941 or 98942 when documentation only supports 98940 — is one of the patterns MACs look for in prepayment review. Your code selection needs to match your documented findings and treatment.

What Happens When Medicare Audits Your Practice

Most chiropractic audits start as probe audits — Medicare pulls a sample of your claims (usually 20–40) and reviews the supporting documentation. If the probe audit finds significant documentation deficiencies, Medicare can:

1. Demand repayment for the claims that don't meet documentation standards
2. Extrapolate the error rate across all similar claims in the look-back period (up to 3 years)
3. Refer the case for further investigation if patterns suggest fraud

The extrapolation step is what makes chiropractic audits so dangerous for small practices. If a probe audit finds a 40% error rate on a sample of claims, Medicare can demand repayment calculated as 40% of everything you billed in the look-back period — not just the sampled claims. For a busy chiropractic practice billing Medicare for several years, that number can be practice-ending.

Five Steps to Strengthen Your Medicare Compliance Right Now

1. Audit your own SOAP notes

Pull 10 random Medicare claims from the last 90 days and review the supporting documentation. For each one, ask: Does this documentation support the AT modifier? Does it document subluxation at a specific level with objective findings? Does it show functional improvement?

2. Review your LCD

Your Medicare Administrative Contractor publishes Local Coverage Determinations for chiropractic services. These tell you exactly what your MAC expects in terms of documentation. Find the chiropractic LCD for your MAC and read it — then compare it to your current SOAP note template.

3. Stop using generic SOAP note templates

Many EHR systems include generic SOAP note templates that were designed for convenience, not Medicare compliance. If your template doesn't have specific fields for subluxation level, associated objective findings, and functional limitation, it needs to be updated.

4. Document functional improvement every visit

Every Medicare visit note should include a measurable indicator of the patient's functional status — not just pain level, but functional ability. Can they walk farther? Sleep better? Return to work activities? This is what distinguishes active/corrective care from maintenance therapy in Medicare's eyes.

5. Know when to transition to maintenance

When a patient has reached maximum therapeutic benefit from active care, Medicare coverage stops. Documenting this transition clearly — and either discharging the patient or transitioning them to a formal maintenance program that they pay for out of pocket (with an ABN) — is essential for compliance.

The Bottom Line

Medicare chiropractic billing compliance in 2026 requires more documentation discipline than most independent practices currently have in place. The OIG is actively auditing, MACs are running prepayment reviews, and the extrapolation risk means that a documentation problem on a handful of claims can become a six-figure recoupment demand.

The good news: the compliance gap is fixable. It doesn't require a compliance officer or expensive consulting. It requires knowing what Medicare expects, building that into your documentation workflow, and staying current as requirements change.

That's exactly what ChiropractorBillingClarity is built to help with. Every month, we synthesize the latest OIG publications, CMS transmittals, and MAC LCD updates into a plain-English brief for independent chiropractic practices — so you always know what Medicare expects, before an auditor shows up to tell you.