M99.05: Segmental and somatic dysfunction of pelvic region
Region: Subluxation
By Dr. Daniel Turner, DC · Reviewed September 2, 2026
What does M99.05 mean?
M99.05 is the ICD-10-CM code for segmental and somatic dysfunction of the pelvic region, covering the sacroiliac joints and pelvis, the fifth spinal region in chiropractic CMT counting.
Searched as pelvic subluxation ICD 10, SI joint dysfunction ICD 10 for chiropractic, and M99.05 meaning.
When does a chiropractor use M99.05?
The home for sacroiliac dysfunction, one of the most common findings in chiropractic practice. Together with M99.04 it fills out the lower half of the region map, and the SI joint work that dominates many low back visits is more honestly coded here than folded silently into the lumbar entry.
Coding rules that matter
- ✓Sacroiliac findings, pelvic asymmetry, and related PART documentation support it
- ✓Counts as a region for CMT totals alongside cervical, thoracic, lumbar, and sacral
- ✓Traumatic SI ligament sprain codes to S33.6XXA with an injury mechanism
The codes around M99.05
| Code | Description |
|---|---|
| M99.04 | Segmental and somatic dysfunction, sacral |
| M99.05 | Segmental and somatic dysfunction, pelvic (this code) |
| S33.6XXA | Sacroiliac ligament sprain, initial encounter |
When M99.05 is the wrong code
Not for traumatic SI ligament injury, which takes S33.6XXA with its mechanism. Not folded silently into the lumbar code when the SI work is where the visit actually happened; the pelvic region is one of the five CMT regions and deserves its own honest entry.
How does M99.05 work on Medicare chiropractic claims?
Primary position when the pelvic region is among those treated, secondary condition code alongside, same as the whole family. Pelvic region counts drawing the claim up to 98941 or 98942 get the same findings scrutiny as sacral ones.
Where claims go wrong
Letting SI work ride under the lumbar codes; counting the pelvic region without pelvic findings; missing the trauma alternative on injury cases.
How Cervica helps with M99.05
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 M99.05 mean?
M99.05 is the ICD-10-CM code for segmental and somatic dysfunction of the pelvic region, covering the sacroiliac joints and pelvis, the fifth spinal region in chiropractic CMT counting.
When does a chiropractor use M99.05?
The home for sacroiliac dysfunction, one of the most common findings in chiropractic practice. Together with M99.04 it fills out the lower half of the region map, and the SI joint work that dominates many low back visits is more honestly coded here than folded silently into the lumbar entry.
How does M99.05 work on Medicare chiropractic claims?
Primary position when the pelvic region is among those treated, secondary condition code alongside, same as the whole family. Pelvic region counts drawing the claim up to 98941 or 98942 get the same findings scrutiny as sacral ones.
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.