ICD-10-CM 2027
ICD-10 code for biomechanical lesion
From the official ICD-10-CM alphabetic index entry “Lesion (s) (nontraumatic) › biomechanical”. Page updated September 29, 2026.
About coding biomechanical lesion
The ICD-10-CM code for biomechanical lesion is M99.9 (Biomechanical lesion, unspecified). The official index lists 25 more specific codes, so check the documentation for details such as type, cause, site or severity before settling on M99.9.
Within M99, choose M99.9 (Biomechanical lesion, unspecified) only when documentation doesn't support a more specific option: segmental and somatic dysfunction (M99.0), subluxation complex (vertebral) (M99.1), subluxation stenosis of neural canal (M99.2), osseous stenosis of neural canal (M99.3), connective tissue stenosis of neural canal (M99.4), intervertebral disc stenosis of neural canal (M99.5), osseous and subluxation stenosis of intervertebral foramina (M99.6), connective tissue and disc stenosis of intervertebral foramina (M99.7) and 1 more.
It is not a CC or MCC, so as a secondary diagnosis it doesn't change the MS-DRG severity level.
In MS-DRG v44.0, it is part of the grouping logic for DRG 564 (Other Musculoskeletal System and Connective Tissue Diagnoses with MCC, relative weight 1.4908), DRG 565 (Other Musculoskeletal System and Connective Tissue Diagnoses with CC, relative weight 0.9783) and DRG 566 (Other Musculoskeletal System and Connective Tissue Diagnoses without CC/MCC, relative weight 0.7378), in MDC 08 (Diseases and Disorders of the Musculoskeletal System and Connective Tissue), as a principal or secondary diagnosis. The DRG a claim lands in depends on the principal diagnosis, procedures and any CC/MCC secondary diagnoses.
More specific biomechanical lesion codes (official index)
- specified type NEC M99.89 — Other biomechanical lesions of abdomen and other regions
- abdomen M99.89 — Other biomechanical lesions of abdomen and other regions
- acromioclavicular M99.87 — Other biomechanical lesions of upper extremity
- cervical region M99.81 — Other biomechanical lesions of cervical region
- cervicothoracic M99.81 — Other biomechanical lesions of cervical region
- costochondral M99.88 — Other biomechanical lesions of rib cage
- costovertebral M99.88 — Other biomechanical lesions of rib cage
- head region M99.80 — Other biomechanical lesions of head region
- hip M99.85 — Other biomechanical lesions of pelvic region
- lower extremity M99.86 — Other biomechanical lesions of lower extremity
- lumbar region M99.83 — Other biomechanical lesions of lumbar region
- lumbosacral M99.83 — Other biomechanical lesions of lumbar region
- occipitocervical M99.80 — Other biomechanical lesions of head region
- pelvic region M99.85 — Other biomechanical lesions of pelvic region
- pubic M99.85 — Other biomechanical lesions of pelvic region
- rib cage M99.88 — Other biomechanical lesions of rib cage
- sacral region M99.84 — Other biomechanical lesions of sacral region
- sacrococcygeal M99.84 — Other biomechanical lesions of sacral region
- sacroiliac M99.84 — Other biomechanical lesions of sacral region
- specified NEC M99.89 — Other biomechanical lesions of abdomen and other regions
- sternochondral M99.88 — Other biomechanical lesions of rib cage
- sternoclavicular M99.87 — Other biomechanical lesions of upper extremity
- thoracic region M99.82 — Other biomechanical lesions of thoracic region
- thoracolumbar M99.82 — Other biomechanical lesions of thoracic region
- upper extremity M99.87 — Other biomechanical lesions of upper extremity
Common questions about biomechanical lesion ICD-10 codes
What is the ICD-10 code for biomechanical lesion?
- M99.9 — Biomechanical lesion, unspecified. More specific codes apply when the documentation supports them: M99.89, M99.89, M99.87, M99.81 and others below.
Is M99.9 billable?
- Yes. M99.9 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can M99.9 be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict M99.9 as a principal diagnosis.
Is M99.9 a CC or MCC?
- No. M99.9 is neither a CC nor an MCC under MS-DRG v44.0.