M99.73
Connective tissue and disc stenosis of intervertebral foramina of lumbar region
M99.73 (also written M9973) is a billable ICD-10-CM diagnosis code for connective tissue and disc stenosis of intervertebral foramina of lumbar region. It is part of the FY2027 code set, effective October 1, 2026. It is one of the 91 codes in category M99 (Biomechanical lesions, not elsewhere classified). The Alphabetic Index lists it under 4 entries. Its coding notes include 10 Excludes2 entries.
Excludes2
Not included here. Both codes may be reported if the patient has both conditions.
Also from chapter/block level (10 notes)
- arthropathic psoriasis (L40.5-)
- certain conditions originating in the perinatal period (P04-P96)
- certain infectious and parasitic diseases (A00-B99)
- compartment syndrome (traumatic) (T79.A-)
- complications of pregnancy, childbirth and the puerperium (O00-O9A)
- congenital malformations, deformations, and chromosomal abnormalities (Q00-Q99)
- endocrine, nutritional and metabolic diseases (E00-E88)
- injury, poisoning and certain other consequences of external causes (S00-T88)
- neoplasms (C00-D49)
- symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R94)
Care settings
How CMS programs treat this code. These are CMS claim edits and list entries, not coverage or eligibility rules.
Home Health Primary
Accepted as the primary (principal) diagnosis on a home health claim. The Home Health Grouper assigns it to the Musculoskeletal Rehabilitation clinical group.
Source: CMS Home Health Grouper Software v07.2.26, effective October 1, 2026Notes
- This category should not be used if the condition can be classified elsewhere.
Also from chapter/block level (1 note)
- Use an external cause code following the code for the musculoskeletal condition, if applicable, to identify the cause of the musculoskeletal condition
Alphabetic Index terms
Terms the official Alphabetic Index lists for this code. 4 entries
- Stenosis, stenotic (cicatricial), intervertebral foramina, connective tissue, lumbar region
- Stenosis, stenotic (cicatricial), intervertebral foramina, connective tissue, lumbosacral
- Stenosis, stenotic (cicatricial), intervertebral foramina, disc, lumbar region
- Stenosis, stenotic (cicatricial), intervertebral foramina, disc, lumbosacral