M54.6: Pain in thoracic spine
Region: Thoracic
By Dr. Daniel Turner, DC · Reviewed September 2, 2026
What does M54.6 mean?
M54.6 is the ICD-10-CM code for pain in the thoracic spine, the mid back region between the neck and the low back. It is the thoracic counterpart to cervicalgia and low back pain and is complete at four characters.
Searched as thoracic pain ICD 10, mid back pain ICD 10, and upper back pain diagnosis code.
When does a chiropractor use M54.6?
The workhorse mid back code, common in desk posture presentations, rib dysfunction cases, and as the third region supporting a 98941 claim. Because the thoracic region is one of the five spinal regions counted for CMT coding, M54.6 is often what justifies the region count step from 98940 to 98941, which means it needs real findings behind it, not a reflexive full spine entry.
Coding rules that matter
- ✓Excludes thoracic pain from intervertebral disc disorder, which codes to the M51 family
- ✓Rib and costovertebral presentations may add M99.08 for rib cage segmental dysfunction where documented
- ✓No laterality or seventh character
The codes around M54.6
| Code | Description |
|---|---|
| M54.6 | Pain in thoracic spine (this code) |
| M54.14 | Radiculopathy, thoracic region |
| M99.02 | Segmental dysfunction, thoracic region |
| M99.08 | Segmental dysfunction, rib cage |
| M51.24 | Other intervertebral disc displacement, thoracic region |
When M54.6 is the wrong code
Not for thoracic pain from a documented disc condition, which belongs in the M51 family. Not for band like pain wrapping the ribs in a nerve pattern, which earns M54.14 after the visceral screen. Rib and costovertebral joint findings deserve M99.08 alongside rather than being folded silently into the spine code.
How does M54.6 work on Medicare chiropractic claims?
Pairs as secondary behind M99.02, the thoracic subluxation code, on Medicare claims. When the thoracic region is one of three or four regions billed under 98941, reviewers check that each region has its own documented findings; M54.6 on the claim with no thoracic findings in the note is exactly what the region count audits look for.
Where claims go wrong
Appearing on every claim to pad the region count; carrying a 98941 with no documented thoracic exam findings; standing alone on a Medicare claim without the M99.02 pairing.
How Cervica helps with M54.6
Cervica validates diagnosis pointers line by line before a claim goes out, checks the Medicare subluxation pairing and region agreement automatically, and carries diagnoses forward from the SOAP note so the claim always matches what the documentation actually says.
Related codes
- →M99.02 · Segmental and somatic dysfunction of thoracic region
- →M54.14 · Radiculopathy, thoracic region
- →S23.3XXA · Sprain of ligaments of thoracic spine, initial encounter
- →M54.2 · Cervicalgia
- →98941 · the CPT code this diagnosis most often supports
- →CO-11 · the denial coding mistakes here produce
- →CO-151 · the denial coding mistakes here produce
Quick answers
What does M54.6 mean?
M54.6 is the ICD-10-CM code for pain in the thoracic spine, the mid back region between the neck and the low back. It is the thoracic counterpart to cervicalgia and low back pain and is complete at four characters.
When does a chiropractor use M54.6?
The workhorse mid back code, common in desk posture presentations, rib dysfunction cases, and as the third region supporting a 98941 claim. Because the thoracic region is one of the five spinal regions counted for CMT coding, M54.6 is often what justifies the region count step from 98940 to 98941, which means it needs real findings behind it, not a reflexive full spine entry.
How does M54.6 work on Medicare chiropractic claims?
Pairs as secondary behind M99.02, the thoracic subluxation code, on Medicare claims. When the thoracic region is one of three or four regions billed under 98941, reviewers check that each region has its own documented findings; M54.6 on the claim with no thoracic findings in the note is exactly what the region count audits look for.
References
General information for billing teams, not medical, legal, or coding advice for any individual claim. ICD-10-CM is maintained by CMS and the National Center for Health Statistics; the official code set and guidelines control. Payer policies vary.