M99.9
Biomechanical lesion, unspecified
Billable FY2026 2025-10-01 → 2026-09-30
This is the unspecified option. 9 more
specific codes sit alongside it. Worth
checking whether the documentation supports one of them.
Exclusions 10 never code together
M00-M99chapter
Excludes2
- arthropathic psoriasis (L40.5-)L40.5-
- certain conditions originating in the perinatal period (P04-P96)P04-P96
- certain infectious and parasitic diseases (A00-B99)A00-B99
- compartment syndrome (traumatic) (T79.A-)T79.A-
- complications of pregnancy, childbirth and the puerperium (O00-O9A)O00-O9A
- congenital malformations, deformations, and chromosomal abnormalities (Q00-Q99)Q00-Q99
- endocrine, nutritional and metabolic diseases (E00-E88)E00-E88
- injury, poisoning and certain other consequences of external causes (S00-T88)S00-T88
- neoplasms (C00-D49)C00-D49
- symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R94)R00-R94
Excludes2 — not included here, but the patient may have both. Code both when documented.
Instructional notes 2
Index entries leading here 1
- Lesion (s) (nontraumatic)
- biomechanical M99.9
Alongside this code 9 same parent — M99
M99.0 Segmental and somatic dysfunction category M99.1 Subluxation complex (vertebral) category M99.2 Subluxation stenosis of neural canal category M99.3 Osseous stenosis of neural canal category M99.4 Connective tissue stenosis of neural canal category M99.5 Intervertebral disc stenosis of neural canal category M99.6 Osseous and subluxation stenosis of intervertebral foramina category M99.7 Connective tiss and disc stenosis of intervertebral foramina category M99.8 Other biomechanical lesions category
Additional references
AHA Coding Clinic® Licence required
Official coding advice for this code. Published by the American Hospital Association. Not included in this installation.