ICD-10 · PDGM grouping
M99-M99 — Biomechanical lesions, not elsewhere classified
Every ICD-10-CM code in this range and the PDGM clinical group CMS assigns to it, read from the CMS grouper crosswalk v07.1.26.
OASIS-E2 v1.00.0 · ingested 2026-04-26
Codes in range
91
No clinical group
1
A period cannot be grouped from these.
Barred as primary
0
CMS rejects these in the primary position.
Where these codes group
90 of the 91 codes in M99-M99 group to Musculoskeletal Rehabilitation. A further 1 are assigned no clinical group at all, which means a 30-day period cannot be grouped from them.
Every code in M99-M99
Descriptions are CMS’s own, abbreviated as CMS abbreviates them.
| Code | Description | Clinical group | Primary position |
|---|---|---|---|
| M9900 | Segmental and somatic dysfunction of head region | E | Accepted |
| M9901 | Segmental and somatic dysfunction of cervical region | E | Accepted |
| M9902 | Segmental and somatic dysfunction of thoracic region | E | Accepted |
| M9903 | Segmental and somatic dysfunction of lumbar region | E | Accepted |
| M9904 | Segmental and somatic dysfunction of sacral region | E | Accepted |
| M9905 | Segmental and somatic dysfunction of pelvic region | E | Accepted |
| M9906 | Segmental and somatic dysfunction of lower extremity | E | Accepted |
| M9907 | Segmental and somatic dysfunction of upper extremity | E | Accepted |
| M9908 | Segmental and somatic dysfunction of rib cage | E | Accepted |
| M9909 | Segmental and somatic dysfunction of abdomen and oth regions | E | Accepted |
| M9910 | Subluxation complex (vertebral) of head region | E | Accepted |
| M9911 | Subluxation complex (vertebral) of cervical region | E | Accepted |
| M9912 | Subluxation complex (vertebral) of thoracic region | E | Accepted |
| M9913 | Subluxation complex (vertebral) of lumbar region | E | Accepted |
| M9914 | Subluxation complex (vertebral) of sacral region | E | Accepted |
| M9915 | Subluxation complex (vertebral) of pelvic region | E | Accepted |
| M9916 | Subluxation complex (vertebral) of lower extremity | E | Accepted |
| M9917 | Subluxation complex (vertebral) of upper extremity | E | Accepted |
| M9918 | Subluxation complex (vertebral) of rib cage | E | Accepted |
| M9919 | Subluxation complex (vertebral) of abdomen and other regions | E | Accepted |
| M9920 | Subluxation stenosis of neural canal of head region | E | Accepted |
| M9921 | Subluxation stenosis of neural canal of cervical region | E | Accepted |
| M9922 | Subluxation stenosis of neural canal of thoracic region | E | Accepted |
| M9923 | Subluxation stenosis of neural canal of lumbar region | E | Accepted |
| M9924 | Subluxation stenosis of neural canal of sacral region | E | Accepted |
| M9925 | Subluxation stenosis of neural canal of pelvic region | E | Accepted |
| M9926 | Subluxation stenosis of neural canal of lower extremity | E | Accepted |
| M9927 | Subluxation stenosis of neural canal of upper extremity | E | Accepted |
| M9928 | Subluxation stenosis of neural canal of rib cage | E | Accepted |
| M9929 | Sublux stenosis of neural canal of abdomen and oth regions | E | Accepted |
| M9930 | Osseous stenosis of neural canal of head region | E | Accepted |
| M9931 | Osseous stenosis of neural canal of cervical region | E | Accepted |
| M9932 | Osseous stenosis of neural canal of thoracic region | E | Accepted |
| M9933 | Osseous stenosis of neural canal of lumbar region | E | Accepted |
| M9934 | Osseous stenosis of neural canal of sacral region | E | Accepted |
| M9935 | Osseous stenosis of neural canal of pelvic region | E | Accepted |
| M9936 | Osseous stenosis of neural canal of lower extremity | E | Accepted |
| M9937 | Osseous stenosis of neural canal of upper extremity | E | Accepted |
| M9938 | Osseous stenosis of neural canal of rib cage | E | Accepted |
| M9939 | Osseous stenosis of neural canal of abdomen and oth regions | E | Accepted |
| M9940 | Connective tissue stenosis of neural canal of head region | E | Accepted |
| M9941 | Connective tiss stenosis of neural canal of cervical region | E | Accepted |
| M9942 | Connective tiss stenosis of neural canal of thoracic region | E | Accepted |
| M9943 | Connective tissue stenosis of neural canal of lumbar region | E | Accepted |
| M9944 | Connective tissue stenosis of neural canal of sacral region | E | Accepted |
| M9945 | Connective tissue stenosis of neural canal of pelvic region | E | Accepted |
| M9946 | Connective tiss stenosis of neural canal of lower extremity | E | Accepted |
| M9947 | Connective tiss stenosis of neural canal of upper extremity | E | Accepted |
| M9948 | Connective tissue stenosis of neural canal of rib cage | E | Accepted |
| M9949 | Conn tiss stenos of neural canal of abdomen and oth regions | E | Accepted |
| M9950 | Intervertebral disc stenosis of neural canal of head region | E | Accepted |
| M9951 | Intvrt disc stenosis of neural canal of cervical region | E | Accepted |
| M9952 | Intvrt disc stenosis of neural canal of thoracic region | E | Accepted |
| M9953 | Intvrt disc stenosis of neural canal of lumbar region | E | Accepted |
| M9954 | Intvrt disc stenosis of neural canal of sacral region | E | Accepted |
| M9955 | Intvrt disc stenosis of neural canal of pelvic region | E | Accepted |
| M9956 | Intervertebral disc stenosis of neural canal of low extrm | E | Accepted |
| M9957 | Intervertebral disc stenosis of neural canal of up extrem | E | Accepted |
| M9958 | Intervertebral disc stenosis of neural canal of rib cage | E | Accepted |
| M9959 | Intvrt disc stenos of neural canal of abd and oth regions | E | Accepted |
| M9960 | Osseous and sublux stenosis of intvrt foramin of head region | E | Accepted |
| M9961 | Osseous and sublux stenosis of intvrt foramin of cerv region | E | Accepted |
| M9962 | Osseous and sublux stenos of intvrt foramin of thor region | E | Accepted |
| M9963 | Osseous and sublux stenos of intvrt foramin of lumbar region | E | Accepted |
| M9964 | Osseous and sublux stenos of intvrt foramin of sacral region | E | Accepted |
| M9965 | Osseous and sublux stenos of intvrt foramin of pelvic region | E | Accepted |
| M9966 | Osseous and sublux stenosis of intvrt foramina of low extrm | E | Accepted |
| M9967 | Osseous and sublux stenosis of intvrt foramina of up extrem | E | Accepted |
| M9968 | Osseous and sublux stenosis of intvrt foramina of rib cage | E | Accepted |
| M9969 | Osseous & sublux stenos of intvrt foramin of abd and oth rgn | E | Accepted |
| M9970 | Conn tiss and disc stenosis of intvrt foramin of head region | E | Accepted |
| M9971 | Conn tiss and disc stenosis of intvrt foramin of cerv region | E | Accepted |
| M9972 | Conn tiss and disc stenos of intvrt foramin of thor region | E | Accepted |
| M9973 | Conn tiss and disc stenos of intvrt foramin of lumbar region | E | Accepted |
| M9974 | Conn tiss and disc stenos of intvrt foramin of sacral region | E | Accepted |
| M9975 | Conn tiss and disc stenos of intvrt foramin of pelvic region | E | Accepted |
| M9976 | Conn tiss and disc stenosis of intvrt foramina of low extrm | E | Accepted |
| M9977 | Conn tiss and disc stenosis of intvrt foramina of up extrem | E | Accepted |
| M9978 | Conn tiss and disc stenosis of intvrt foramina of rib cage | E | Accepted |
| M9979 | Conn tiss & disc stenos of intvrt foramin of abd and oth rgn | E | Accepted |
| M9980 | Other biomechanical lesions of head region | E | Accepted |
| M9981 | Other biomechanical lesions of cervical region | E | Accepted |
| M9982 | Other biomechanical lesions of thoracic region | E | Accepted |
| M9983 | Other biomechanical lesions of lumbar region | E | Accepted |
| M9984 | Other biomechanical lesions of sacral region | E | Accepted |
| M9985 | Other biomechanical lesions of pelvic region | E | Accepted |
| M9986 | Other biomechanical lesions of lower extremity | E | Accepted |
| M9987 | Other biomechanical lesions of upper extremity | E | Accepted |
| M9988 | Other biomechanical lesions of rib cage | E | Accepted |
| M9989 | Other biomechanical lesions of abdomen and other regions | E | Accepted |
| M999 | Biomechanical lesion, unspecified | None | Cannot group |
Source: CMS HH PPS Grouper Software v07.1.26, effective 2026-04-01. 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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