M99.4Connective tissue stenosis of neural canal

M99.4 is the ICD-10-CM diagnosis code for connective tissue stenosis of neural canal. 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 (biomechanical lesions, not elsewhere classified), M99.4 is specifically for connective tissue stenosis of neural canal. Related codes cover 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), 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), other biomechanical lesions (M99.8) and 1 more.

To report this condition, pick the subcode that matches the documentation: M99.40 (of head region), M99.41 (of cervical region), M99.42 (of thoracic region), M99.43 (of lumbar region), M99.44 (of sacral region), M99.45 (of pelvic region), M99.46 (of lower extremity), M99.47 (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.