M99.04: Segmental and somatic dysfunction of sacral region
Region: Subluxation
By Dr. Daniel Turner, DC · Reviewed September 2, 2026
What does M99.04 mean?
M99.04 is the ICD-10-CM code for segmental and somatic dysfunction of the sacral region, the subluxation code for the sacrum, which counts as its own spinal region in CMT coding.
Searched as sacral subluxation ICD 10 and M99.04 meaning.
When does a chiropractor use M99.04?
Easy to forget and occasionally decisive: the sacral region is one of the five regions the CMT codes count, so documented sacral findings coded with M99.04 can be what legitimately supports 98941 instead of 98940. It also separates true sacral dysfunction from the pelvic and sacroiliac patterns that belong on M99.05.
Coding rules that matter
- ✓Sacral findings distinct from lumbar and pelvic ones justify the code
- ✓The sacrum counts as a region for 98940 through 98942 region totals
- ✓Sacroiliac joint dysfunction generally localizes to the pelvic code M99.05 instead
The codes around M99.04
| Code | Description |
|---|---|
| M99.03 | Segmental and somatic dysfunction, lumbar |
| M99.04 | Segmental and somatic dysfunction, sacral (this code) |
| M99.05 | Segmental and somatic dysfunction, pelvic |
When M99.04 is the wrong code
Not for sacroiliac joint dysfunction, which localizes to the pelvic code M99.05; the sacrum and the SI joints are different structures and different regions. Not a free region count bump; sacral findings need their own documentation, distinct from the lumbar note above them.
How does M99.04 work on Medicare chiropractic claims?
Same primary position rules as the rest of the family when the sacral region is treated. Reviewers cross check that a claim counting the sacral region carries sacral findings, not just a lumbar note that mentions the sacrum.
Where claims go wrong
Using lumbar findings to justify a sacral region count; confusing sacral and pelvic dysfunction; coding it without distinct documentation.
How Cervica helps with M99.04
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
Quick answers
What does M99.04 mean?
M99.04 is the ICD-10-CM code for segmental and somatic dysfunction of the sacral region, the subluxation code for the sacrum, which counts as its own spinal region in CMT coding.
When does a chiropractor use M99.04?
Easy to forget and occasionally decisive: the sacral region is one of the five regions the CMT codes count, so documented sacral findings coded with M99.04 can be what legitimately supports 98941 instead of 98940. It also separates true sacral dysfunction from the pelvic and sacroiliac patterns that belong on M99.05.
How does M99.04 work on Medicare chiropractic claims?
Same primary position rules as the rest of the family when the sacral region is treated. Reviewers cross check that a claim counting the sacral region carries sacral findings, not just a lumbar note that mentions the sacrum.
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.