CPT 98940, 98941, 98942: chiropractic manipulative treatment coding by region.
Three codes, one variable: how many spinal regions were adjusted. That simplicity is exactly why the region-count rule is the most audited part of chiropractic coding — it's easy to state and easy to get wrong in documentation, and a mismatch between the code billed and the regions actually supported in the note is the top finding in a chiropractic RAC or SIU audit. This guide covers the region logic code by code, the one-CMT-per-encounter rule, what the note has to show for each region billed, and where extraspinal manipulation (98943) sits outside the whole system.
Key takeaways
- Code selection is region count, full stop. Not technique, not time, not how many separate adjustments were performed — just how many of the five spinal regions were treated and independently supported in the note.
- One CMT code per encounter, always — a visit combining a diversified cervical technique with an Activator adjustment to the lumbar spine is still one code, not two.
- The region-documentation mismatch is the top audit finding in this code family. Billing 98942 with clinical findings in two regions instead of five is exactly the pattern a payer's review is built to catch.
- 98943 (extraspinal) is never covered by Medicare under any circumstance — a statutory exclusion, not a documentation or medical-necessity question, so it's billed with GY every time it appears on a Medicare claim.
The five spinal regions and the three-code structure
Chiropractic manipulative treatment (CMT) codes are built around five defined spinal regions, and nothing else about the code family varies: cervical, thoracic, lumbar, sacral, and pelvic. Each of the three codes covers a range of how many of those five regions were treated in a single encounter.
| Code | Regions treated | Medicare status |
|---|---|---|
98940 | 1–2 of the 5 spinal regions | Covered with modifier AT for active/corrective treatment |
98941 | 3–4 of the 5 spinal regions | Covered with modifier AT for active/corrective treatment |
98942 | All 5 spinal regions | Covered with modifier AT for active/corrective treatment |
98943 | Extraspinal (not a spinal region — see below) | Never covered — statutory exclusion, bill with GY |
Two regions and four regions are the practical thresholds that decide the boundary between codes: three regions is the floor for 98941, not the ceiling for 98940, and a single region beyond four doesn't exist as a fourth code — five regions is the maximum the family describes, and that's 98942 regardless of how many individual segments within those five regions were manipulated. A chiropractor who adjusts C1–C2, C5–C6, and T4 has still only treated two regions — cervical and thoracic — which is 98940, not a higher code, because segment count within a region doesn't add to the region total.
One CMT code per encounter, regardless of technique
This is the rule practices trip on most often when a visit involves more than one manipulation style: only one CMT code is ever billed per encounter, no matter how many distinct techniques were used within that visit. A diversified (manual, high-velocity low-amplitude) technique applied to the cervical spine, combined with an Activator instrument adjustment to the lumbar spine in the same visit, is not two billable services — it's one CMT code, selected by the total region count across the whole encounter (here, two regions, so 98940), not by technique count or by treating each technique as its own line item.
The same logic applies to a visit where a chiropractor performs a manual adjustment plus a drop-table or instrument-assisted technique on the same or different regions: count the total distinct spinal regions treated across every technique used that visit, then select the one code that matches. There's no coding mechanism in the CMT family for billing "extra" for a second technique layered onto a region already counted, and attempting to do so — whether as two CMT lines or as a CMT line plus an unlisted-procedure add-on for the second technique — is not supported by the code structure and will not survive a payer's line-item review.
The region-documentation upcoding trap
This is the top audit finding in chiropractic CMT coding, by a wide margin, and it's a documentation problem more often than an intentional overbilling problem. The trap: billing a higher-region code than the note actually supports, because the region count on the claim reflects what was manipulated in the chiropractor's memory of a routine visit rather than what was independently documented, region by region, in that visit's note.
Billing 98942 requires the note to carry clinical findings supporting involvement in all five regions — cervical, thoracic, lumbar, sacral, and pelvic — not five regions manipulated with findings written up for only two or three of them. A note built around a single global sentence ("adjusted full spine, patient tolerated well") supports one code no matter how many regions were actually touched, because there's nothing in it that ties a specific finding to a specific region. That's exactly the pattern a Medicare RAC audit or a commercial payer's SIU review is built to catch: a practice billing 98942 on close to every visit, month after month, with documentation language that doesn't vary region-by-region or visit-by-visit.
- Cervical: restricted right rotation, PART A+R positive at C4-C5.
- Thoracic: hypomobility T6-T8, PART R+T positive, paraspinal tenderness on palpation.
- Lumbar: decreased flexion, PART P+A positive at L4-L5.
- Sacral: SI joint tenderness on palpation, PART P+T positive.
- Pelvic: leg-length discrepancy noted on exam, PART A positive.
- "Full spine adjustment performed, patient reports feeling better." One sentence, no region-specific findings, no PART elements tied to any of the five regions.
- Identical boilerplate language across consecutive visits with no change in findings, region count, or clinical status — a pattern that reads as templated rather than assessed.
The fix isn't more documentation for its own sake — it's documentation structured around the code being billed. If the note is organized region by region, with at least the PART elements that justified treating that region named specifically, the code selection defends itself. If the note is one paragraph describing the visit as a whole, no code in this family is fully defensible on audit, even if every region really was treated appropriately.
Extraspinal manipulation: CPT 98943
98943 covers manipulation of extraspinal structures — the extremities, rib cage, and temporomandibular joint (shoulders, knees, wrists, ankles, ribs, and the jaw). It sits outside the three-code spinal family entirely; a visit that includes both spinal and extraspinal manipulation still bills the applicable spinal CMT code (98940–98942) for the spinal work, and 98943 separately identifies the extraspinal component — it does not add to or change the spinal region count.
For Medicare, 98943 is never payable, under any circumstance, regardless of medical necessity or documentation quality. The chiropractic benefit is limited by statute to manual manipulation of the spine to correct a subluxation; extraspinal work isn't a lower coverage tier or a harder medical-necessity bar to clear — it's categorically outside the benefit. Bill 98943 to Medicare with modifier GY so the claim denies as a statutory exclusion, which routes correctly to secondary insurance or direct patient billing, rather than posting as an ambiguous denial that looks like a documentation failure. Commercial payers vary: some cover extraspinal manipulation under standard musculoskeletal benefits, so check the specific plan's policy and required modifiers rather than assuming Medicare's exclusion carries over.
Documentation checklist by code
- 1Match the region count to the code before submission, not after. If the note supports two regions, bill 98940 even if the treatment plan originally anticipated more.
- 2Name at least one PART element per region billed, with the specific segment or muscle group — not a single global finding applied to the whole spine.
- 3Confirm only one CMT code appears on the claim, regardless of how many techniques were used within the visit.
- 4Separate extraspinal findings from spinal findings when 98943 is billed alongside a spinal CMT code, so each code's medical necessity stands on its own.
- 5Append GY to every Medicare 98943 line, not AT — AT certifies active/corrective treatment under a benefit 98943 isn't part of, and using it here is a modifier applied to a service outside the benefit it's meant to describe.
Run a quarterly self-audit pulling every 98942 claim from the last 90 days and checking the note against the five-region documentation standard above. If more than a small minority of your 98942 visits show boilerplate or single-sentence documentation, that's the exact pattern a payer audit will flag first — better to catch and correct the note template internally than to find out from a recoupment letter.
Worried your CMT coding wouldn't survive an audit?
We'll review a sample of your recent 98940-98942 claims against the underlying documentation and show exactly where the region count and the note don't line up.
Frequently asked questions
How do we decide between 98940, 98941, and 98942?
Strictly by the count of spinal regions treated and documented that visit: 98940 covers 1-2 regions, 98941 covers 3-4 regions, and 98942 covers all 5 regions (cervical, thoracic, lumbar, sacral, pelvic). The number of manipulation techniques used, or how much time the visit took, doesn't factor into the code selection at all — only the region count, and only when each region billed has its own supporting clinical finding in the note.
Can we bill two CMT codes if the chiropractor used two different techniques in one visit?
No. Only one CMT code is billed per encounter regardless of how many distinct manipulation techniques were used within that visit — a diversified technique on the cervical spine plus an Activator adjustment on the lumbar spine is still one CMT code, selected by total region count across the whole visit, not two codes for two techniques.
Is extraspinal manipulation ever billable to Medicare?
No, never, regardless of documentation or medical necessity. CPT 98943 covers extraspinal manipulation of the extremities, rib cage, and TMJ, and Medicare's chiropractic benefit is limited by statute to manipulation of the spine only. Bill 98943 to Medicare with modifier GY so it posts as a statutory exclusion, not a documentation failure, and pursue payment from the patient or a secondary payer directly.
Verify before billing. CPT is a registered trademark of the American Medical Association; codes here are paraphrased, not reproduced from the CPT Professional edition. CPT, HCPCS and ICD-10 codes, coverage policy, and bundling edits change, including annual code-set updates. This page reflects standard industry practice and is provided for general education — it is not a substitute for your own compliance review, your current payer contracts, or the current-year code sets. Confirm requirements against your specific payer mix before submitting claims.