M99.8Other biomechanical lesions

M99.8 is the ICD-10-CM diagnosis code for other biomechanical lesions. It belongs to category M99 (biomechanical lesions, not elsewhere classified), block M99 (biomechanical lesions, not elsewhere classified) and chapter 13 (diseases of the musculoskeletal system and connective tissue). It is a header code, so it can't be reported by itself; one of its 10 subcodes must be used instead.

Within M99, choose M99.8 (Other biomechanical lesions) 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.

To report this condition, pick the subcode that matches the documentation: M99.80 (of head region), M99.81 (of cervical region), M99.82 (of thoracic region), M99.83 (of lumbar region), M99.84 (of sacral region), M99.85 (of pelvic region), M99.86 (of lower extremity), M99.87 (of upper extremity) and 2 more.

It has been part of ICD-10-CM since the code set took effect on October 1, 2015 and hasn't changed since.