ICD-10 · PDGM grouping
M99 Biomechanical lesions, not elsewhere classified
All 91 codes in the M99 family, with the PDGM clinical group, comorbidity subgroup and primary-position rule CMS assigns, read from the CMS grouper crosswalk v07.2.26 and the CDC FY2027 code file.
ICD-10-CM FY2027 · CMS grouper v07.2.26
Codes in family
91
Can lead a claim
90
Cannot lead a claim
1
What CMS assigns to M99
90 of the 91 codes group to Musculoskeletal Rehabilitation; 1 is assigned no clinical group. None of the 91 is assigned a comorbidity subgroup. 90 of the 91 can lead a claim.
Every code in M99
Descriptions are CDC’s FY2027 wording; where CMS’s grouper abbreviates one, its form is shown beneath.
| Code | Description | Primary position | Clinical group | Comorbidity subgroup |
|---|---|---|---|---|
| M99.0 Segmental and somatic dysfunction | ||||
| M99.00 | Segmental and somatic dysfunction of head region | Can lead a claim | E | None |
| M99.01 | Segmental and somatic dysfunction of cervical region | Can lead a claim | E | None |
| M99.02 | Segmental and somatic dysfunction of thoracic region | Can lead a claim | E | None |
| M99.03 | Segmental and somatic dysfunction of lumbar region | Can lead a claim | E | None |
| M99.04 | Segmental and somatic dysfunction of sacral region | Can lead a claim | E | None |
| M99.05 | Segmental and somatic dysfunction of pelvic region | Can lead a claim | E | None |
| M99.06 | Segmental and somatic dysfunction of lower extremity | Can lead a claim | E | None |
| M99.07 | Segmental and somatic dysfunction of upper extremity | Can lead a claim | E | None |
| M99.08 | Segmental and somatic dysfunction of rib cage | Can lead a claim | E | None |
| M99.09 | Segmental and somatic dysfunction of abdomen and other regionsCMS: Segmental and somatic dysfunction of abdomen and oth regions | Can lead a claim | E | None |
| M99.1 Subluxation complex (vertebral) | ||||
| M99.10 | Subluxation complex (vertebral) of head region | Can lead a claim | E | None |
| M99.11 | Subluxation complex (vertebral) of cervical region | Can lead a claim | E | None |
| M99.12 | Subluxation complex (vertebral) of thoracic region | Can lead a claim | E | None |
| M99.13 | Subluxation complex (vertebral) of lumbar region | Can lead a claim | E | None |
| M99.14 | Subluxation complex (vertebral) of sacral region | Can lead a claim | E | None |
| M99.15 | Subluxation complex (vertebral) of pelvic region | Can lead a claim | E | None |
| M99.16 | Subluxation complex (vertebral) of lower extremity | Can lead a claim | E | None |
| M99.17 | Subluxation complex (vertebral) of upper extremity | Can lead a claim | E | None |
| M99.18 | Subluxation complex (vertebral) of rib cage | Can lead a claim | E | None |
| M99.19 | Subluxation complex (vertebral) of abdomen and other regions | Can lead a claim | E | None |
| M99.2 Subluxation stenosis of neural canal | ||||
| M99.20 | Subluxation stenosis of neural canal of head region | Can lead a claim | E | None |
| M99.21 | Subluxation stenosis of neural canal of cervical region | Can lead a claim | E | None |
| M99.22 | Subluxation stenosis of neural canal of thoracic region | Can lead a claim | E | None |
| M99.23 | Subluxation stenosis of neural canal of lumbar region | Can lead a claim | E | None |
| M99.24 | Subluxation stenosis of neural canal of sacral region | Can lead a claim | E | None |
| M99.25 | Subluxation stenosis of neural canal of pelvic region | Can lead a claim | E | None |
| M99.26 | Subluxation stenosis of neural canal of lower extremity | Can lead a claim | E | None |
| M99.27 | Subluxation stenosis of neural canal of upper extremity | Can lead a claim | E | None |
| M99.28 | Subluxation stenosis of neural canal of rib cage | Can lead a claim | E | None |
| M99.29 | Subluxation stenosis of neural canal of abdomen and other regionsCMS: Sublux stenosis of neural canal of abdomen and oth regions | Can lead a claim | E | None |
| M99.3 Osseous stenosis of neural canal | ||||
| M99.30 | Osseous stenosis of neural canal of head region | Can lead a claim | E | None |
| M99.31 | Osseous stenosis of neural canal of cervical region | Can lead a claim | E | None |
| M99.32 | Osseous stenosis of neural canal of thoracic region | Can lead a claim | E | None |
| M99.33 | Osseous stenosis of neural canal of lumbar region | Can lead a claim | E | None |
| M99.34 | Osseous stenosis of neural canal of sacral region | Can lead a claim | E | None |
| M99.35 | Osseous stenosis of neural canal of pelvic region | Can lead a claim | E | None |
| M99.36 | Osseous stenosis of neural canal of lower extremity | Can lead a claim | E | None |
| M99.37 | Osseous stenosis of neural canal of upper extremity | Can lead a claim | E | None |
| M99.38 | Osseous stenosis of neural canal of rib cage | Can lead a claim | E | None |
| M99.39 | Osseous stenosis of neural canal of abdomen and other regionsCMS: Osseous stenosis of neural canal of abdomen and oth regions | Can lead a claim | E | None |
| M99.4 Connective tissue stenosis of neural canal | ||||
| M99.40 | Connective tissue stenosis of neural canal of head region | Can lead a claim | E | None |
| M99.41 | Connective tissue stenosis of neural canal of cervical regionCMS: Connective tiss stenosis of neural canal of cervical region | Can lead a claim | E | None |
| M99.42 | Connective tissue stenosis of neural canal of thoracic regionCMS: Connective tiss stenosis of neural canal of thoracic region | Can lead a claim | E | None |
| M99.43 | Connective tissue stenosis of neural canal of lumbar region | Can lead a claim | E | None |
| M99.44 | Connective tissue stenosis of neural canal of sacral region | Can lead a claim | E | None |
| M99.45 | Connective tissue stenosis of neural canal of pelvic region | Can lead a claim | E | None |
| M99.46 | Connective tissue stenosis of neural canal of lower extremityCMS: Connective tiss stenosis of neural canal of lower extremity | Can lead a claim | E | None |
| M99.47 | Connective tissue stenosis of neural canal of upper extremityCMS: Connective tiss stenosis of neural canal of upper extremity | Can lead a claim | E | None |
| M99.48 | Connective tissue stenosis of neural canal of rib cage | Can lead a claim | E | None |
| M99.49 | Connective tissue stenosis of neural canal of abdomen and other regionsCMS: Conn tiss stenos of neural canal of abdomen and oth regions | Can lead a claim | E | None |
| M99.5 Intervertebral disc stenosis of neural canal | ||||
| M99.50 | Intervertebral disc stenosis of neural canal of head region | Can lead a claim | E | None |
| M99.51 | Intervertebral disc stenosis of neural canal of cervical regionCMS: Intvrt disc stenosis of neural canal of cervical region | Can lead a claim | E | None |
| M99.52 | Intervertebral disc stenosis of neural canal of thoracic regionCMS: Intvrt disc stenosis of neural canal of thoracic region | Can lead a claim | E | None |
| M99.53 | Intervertebral disc stenosis of neural canal of lumbar regionCMS: Intvrt disc stenosis of neural canal of lumbar region | Can lead a claim | E | None |
| M99.54 | Intervertebral disc stenosis of neural canal of sacral regionCMS: Intvrt disc stenosis of neural canal of sacral region | Can lead a claim | E | None |
| M99.55 | Intervertebral disc stenosis of neural canal of pelvic regionCMS: Intvrt disc stenosis of neural canal of pelvic region | Can lead a claim | E | None |
| M99.56 | Intervertebral disc stenosis of neural canal of lower extremityCMS: Intervertebral disc stenosis of neural canal of low extrm | Can lead a claim | E | None |
| M99.57 | Intervertebral disc stenosis of neural canal of upper extremityCMS: Intervertebral disc stenosis of neural canal of up extrem | Can lead a claim | E | None |
| M99.58 | Intervertebral disc stenosis of neural canal of rib cage | Can lead a claim | E | None |
| M99.59 | Intervertebral disc stenosis of neural canal of abdomen and other regionsCMS: Intvrt disc stenos of neural canal of abd and oth regions | Can lead a claim | E | None |
| M99.6 Osseous and subluxation stenosis of intervertebral foramina | ||||
| M99.60 | Osseous and subluxation stenosis of intervertebral foramina of head regionCMS: Osseous and sublux stenosis of intvrt foramin of head region | Can lead a claim | E | None |
| M99.61 | Osseous and subluxation stenosis of intervertebral foramina of cervical regionCMS: Osseous and sublux stenosis of intvrt foramin of cerv region | Can lead a claim | E | None |
| M99.62 | Osseous and subluxation stenosis of intervertebral foramina of thoracic regionCMS: Osseous and sublux stenos of intvrt foramin of thor region | Can lead a claim | E | None |
| M99.63 | Osseous and subluxation stenosis of intervertebral foramina of lumbar regionCMS: Osseous and sublux stenos of intvrt foramin of lumbar region | Can lead a claim | E | None |
| M99.64 | Osseous and subluxation stenosis of intervertebral foramina of sacral regionCMS: Osseous and sublux stenos of intvrt foramin of sacral region | Can lead a claim | E | None |
| M99.65 | Osseous and subluxation stenosis of intervertebral foramina of pelvic regionCMS: Osseous and sublux stenos of intvrt foramin of pelvic region | Can lead a claim | E | None |
| M99.66 | Osseous and subluxation stenosis of intervertebral foramina of lower extremityCMS: Osseous and sublux stenosis of intvrt foramina of low extrm | Can lead a claim | E | None |
| M99.67 | Osseous and subluxation stenosis of intervertebral foramina of upper extremityCMS: Osseous and sublux stenosis of intvrt foramina of up extrem | Can lead a claim | E | None |
| M99.68 | Osseous and subluxation stenosis of intervertebral foramina of rib cageCMS: Osseous and sublux stenosis of intvrt foramina of rib cage | Can lead a claim | E | None |
| M99.69 | Osseous and subluxation stenosis of intervertebral foramina of abdomen and other regionsCMS: Osseous & sublux stenos of intvrt foramin of abd and oth rgn | Can lead a claim | E | None |
| M99.7 Connective tissue and disc stenosis of intervertebral foramina | ||||
| M99.70 | Connective tissue and disc stenosis of intervertebral foramina of head regionCMS: Conn tiss and disc stenosis of intvrt foramin of head region | Can lead a claim | E | None |
| M99.71 | Connective tissue and disc stenosis of intervertebral foramina of cervical regionCMS: Conn tiss and disc stenosis of intvrt foramin of cerv region | Can lead a claim | E | None |
| M99.72 | Connective tissue and disc stenosis of intervertebral foramina of thoracic regionCMS: Conn tiss and disc stenos of intvrt foramin of thor region | Can lead a claim | E | None |
| M99.73 | Connective tissue and disc stenosis of intervertebral foramina of lumbar regionCMS: Conn tiss and disc stenos of intvrt foramin of lumbar region | Can lead a claim | E | None |
| M99.74 | Connective tissue and disc stenosis of intervertebral foramina of sacral regionCMS: Conn tiss and disc stenos of intvrt foramin of sacral region | Can lead a claim | E | None |
| M99.75 | Connective tissue and disc stenosis of intervertebral foramina of pelvic regionCMS: Conn tiss and disc stenos of intvrt foramin of pelvic region | Can lead a claim | E | None |
| M99.76 | Connective tissue and disc stenosis of intervertebral foramina of lower extremityCMS: Conn tiss and disc stenosis of intvrt foramina of low extrm | Can lead a claim | E | None |
| M99.77 | Connective tissue and disc stenosis of intervertebral foramina of upper extremityCMS: Conn tiss and disc stenosis of intvrt foramina of up extrem | Can lead a claim | E | None |
| M99.78 | Connective tissue and disc stenosis of intervertebral foramina of rib cageCMS: Conn tiss and disc stenosis of intvrt foramina of rib cage | Can lead a claim | E | None |
| M99.79 | Connective tissue and disc stenosis of intervertebral foramina of abdomen and other regionsCMS: Conn tiss & disc stenos of intvrt foramin of abd and oth rgn | Can lead a claim | E | None |
| M99.8 Other biomechanical lesions | ||||
| M99.80 | Other biomechanical lesions of head region | Can lead a claim | E | None |
| M99.81 | Other biomechanical lesions of cervical region | Can lead a claim | E | None |
| M99.82 | Other biomechanical lesions of thoracic region | Can lead a claim | E | None |
| M99.83 | Other biomechanical lesions of lumbar region | Can lead a claim | E | None |
| M99.84 | Other biomechanical lesions of sacral region | Can lead a claim | E | None |
| M99.85 | Other biomechanical lesions of pelvic region | Can lead a claim | E | None |
| M99.86 | Other biomechanical lesions of lower extremity | Can lead a claim | E | None |
| M99.87 | Other biomechanical lesions of upper extremity | Can lead a claim | E | None |
| M99.88 | Other biomechanical lesions of rib cage | Can lead a claim | E | None |
| M99.89 | Other biomechanical lesions of abdomen and other regions | Can lead a claim | E | None |
| M99.9 | Biomechanical lesion, unspecified | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
Sources: CMS HH PPS Grouper Software v07.2.26, effective 2026-10-01, for the clinical group, comorbidity subgroup, code-first conventions and primary-position flags; CDC NCHS ICD-10-CM FY2027 code descriptions for the family title and code wording. This is the crosswalk Medicare runs a claim through. Grouping also depends on admission source, timing, the OASIS functional items and the rest of the diagnosis list.
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