Biomechanical lesions, not elsewhere classified

Segmental and somatic dysfunction of the head region — biomechanical impairment of skeletal, arthrodal, and myofascial structures of the cranial region, including associated vascular, lymphatic, and neural elements, not classifiable under a more specific diagnosis.

Segmental and somatic dysfunction of the cervical region describes restricted or aberrant motion, asymmetry, tissue texture changes, or tenderness localized to one or more cervical spinal segments, as assessed by a qualified provider.

M99.02 identifies segmental and somatic dysfunction of the thoracic region — a biomechanical lesion category capturing impaired mobility, altered tissue texture, and asymmetry of the thoracic vertebral segments as assessed by a clinician.

Segmental and somatic dysfunction of the lumbar region — a biomechanical lesion of the lower spine coded under M99 (Biomechanical Lesions, Not Elsewhere Classified) when no more specific structural diagnosis applies.

M99.04 identifies segmental and somatic dysfunction of the sacral region — impaired or altered biomechanical function of the sacrum and its articulations, including the sacroiliac joints, at the base of the spine.

M99.05 identifies segmental and somatic dysfunction localized to the pelvic region — a biomechanical classification capturing restricted or altered motion, tenderness, and tissue texture changes in pelvic structures that cannot be classified under a more specific diagnosis.

M99.06 identifies segmental and somatic dysfunction localized to the lower extremity, classified under biomechanical lesions not elsewhere classified (M99) in ICD-10-CM Chapter 13.

Segmental and somatic dysfunction of the upper extremity, covering restricted or altered motion and tissue texture changes in the shoulder girdle, arm, elbow, forearm, wrist, and hand — used primarily in osteopathic manipulative treatment (OMT) and chiropractic billing contexts.

M99.08 identifies segmental and somatic dysfunction localized to the rib cage, classified as a biomechanical lesion under ICD-10-CM Chapter 13.

Segmental and somatic dysfunction affecting the abdominal region or any anatomical area not captured by the more specific M99.00–M99.08 codes — the designated catch-all within the M99.0 family.

Vertebral subluxation complex localized to the head region, encompassing the occiput and occipitocervical junction, classified as a biomechanical lesion under ICD-10-CM Chapter 13.

M99.11 identifies a vertebral subluxation complex localized to the cervical region — a biomechanical lesion characterized by altered segmental motion and positional integrity of the cervical spine, classified under the ICD-10-CM category for biomechanical lesions not elsewhere classified.

M99.12 identifies a vertebral subluxation complex localized to the thoracic spine — a biomechanical lesion classified under M99 (Biomechanical lesions, not elsewhere classified) rather than under injury or traumatic dislocation codes.

Vertebral subluxation complex localized to the lumbar spine, representing aberrant segmental motion or positional fault of one or more lumbar vertebrae as a biomechanical lesion.

Vertebral subluxation complex localized to the sacral region, classified under biomechanical lesions not elsewhere classified (M99 category).

Vertebral subluxation complex localized to the pelvic region, classified under biomechanical lesions not elsewhere classified (M99 category).

M99.16 identifies a subluxation complex of a vertebral nature localized to the lower extremity, classified under biomechanical lesions not elsewhere classified in Chapter 13 of ICD-10-CM.

Biomechanical subluxation complex of the upper extremity, classified as a vertebral subluxation affecting structures of the shoulder girdle or related upper limb region, including the acromioclavicular and sternoclavicular joints.

M99.18 identifies a subluxation complex of vertebral origin specifically affecting the rib cage, encompassing costochondral, costovertebral, sternochondral, and rib cage articulation dysfunctions classified as biomechanical lesions.

Vertebral subluxation complex affecting the abdominal region or any anatomical region not captured by the more specific M99.10–M99.18 site codes.

M99.20 identifies subluxation stenosis of the neural canal localized to the head region — a biomechanical lesion in which positional displacement of a cranial or upper cervical segment narrows the neural canal passageway.

Subluxation stenosis of the neural canal in the cervical region — narrowing of the spinal canal at the neck caused by vertebral subluxation affecting nerve root or spinal cord space.

Neural canal narrowing in the thoracic spine caused by a vertebral subluxation — a biomechanical lesion reducing the space available for the spinal cord and nerve roots at the thoracic level.

M99.23 identifies narrowing of the lumbar neural canal caused by vertebral subluxation — a biomechanical lesion in which spinal segment malalignment mechanically compromises the space available for neural structures.

Narrowing of the sacral neural canal caused by positional or segmental subluxation of sacral vertebral structures, classified as a biomechanical lesion under M99.

Narrowing of the neural canal in the pelvic region caused by subluxation — a biomechanical displacement of adjacent structures that mechanically compromises the canal space.

Narrowing of the neural canal in the lower extremity caused by a subluxation — a partial dislocation or biomechanical displacement — that mechanically compresses the neural passageway in that region.

Neural canal narrowing in the upper extremity caused by a biomechanical subluxation complex — a positional or movement-based stenosis rather than osseous, disc, or connective tissue pathology.

Narrowing of the neural canal in the rib cage region caused by positional or mechanical subluxation of adjacent bony or soft-tissue structures, classified as a biomechanical lesion not attributable to a more specific structural diagnosis.

Subluxation stenosis of the neural canal affecting the abdominal region or other anatomical regions not specifically indexed elsewhere in the M99.2 subcategory.

Bone-driven narrowing of the neural canal at the head region, classified as a biomechanical lesion under the M99 category, distinct from disc-mediated or connective-tissue-mediated stenosis at the same level.

Narrowing of the spinal neural canal in the cervical region caused by bony changes — including osteophytes, hypertrophied facets, or ossified ligaments — that encroach on the canal space.

Bone-driven narrowing of the spinal canal in the thoracic region that mechanically compresses neural structures, classified under biomechanical lesions not elsewhere classified (M99).

Bony narrowing of the spinal (neural) canal at the lumbar level, where osseous overgrowth or structural change compresses neural elements within the canal itself — classified as a biomechanical lesion under M99.

Bone-based narrowing of the neural canal at the sacral level, classified under biomechanical lesions of the musculoskeletal system, distinct from disc or connective tissue causes of the same stenosis.

Osseous stenosis of the neural canal in the pelvic region caused by bony overgrowth or structural changes that narrow the canal and compress neural structures.

Bone-mediated narrowing of the neural canal affecting the lower extremity region, classified as a biomechanical lesion under the M99 category.

Bone-driven narrowing of the neural canal in the upper extremity — shoulder girdle, arm, elbow, or forearm region — caused by osseous (bony) encroachment rather than soft-tissue or disc pathology.

M99.38 identifies bone-related narrowing of the neural canal specifically within the rib cage region, classified as a biomechanical lesion not classifiable elsewhere.

Osseous stenosis of the neural canal occurring in the abdominal region or other anatomical regions not captured by more specific site-level codes within the M99.3 category.

M99.40 identifies connective tissue stenosis of the neural canal localized to the head region — a biomechanical lesion where fibrous or connective tissue narrows the spinal/neural canal at the craniovertebral or head level.

M99.41 identifies narrowing of the cervical spinal canal caused by connective tissue (e.g., fibrosis, ligamentous hypertrophy, or scar tissue) rather than by bone, disc material, or subluxation.

Narrowing of the thoracic spinal neural canal caused by connective tissue proliferation or fibrosis, classified as a biomechanical lesion under M99.

M99.43 identifies connective tissue stenosis of the neural canal specifically in the lumbar region — a biomechanical lesion in which fibrous or connective tissue encroaches on the lumbar spinal canal, reducing neural space.

Narrowing of the sacral neural canal caused by abnormal connective tissue — fibrosis, ligamentous hypertrophy, or other non-osseous soft-tissue changes — that encroaches on neural structures at the sacral level.

Narrowing of the neural canal in the pelvic region caused by abnormal connective tissue, classified as a biomechanical lesion under the M99 category.

M99.46 identifies connective tissue stenosis of the neural canal localized to the lower extremity — a biomechanical lesion in which fibrotic or thickened connective tissue narrows the bony canal through which neural structures pass in the lower limb region.

M99.47 identifies narrowing of the neural canal in the upper extremity caused by connective tissue pathology, classified under biomechanical lesions not elsewhere classified.

Narrowing of the neural canal in the rib cage region caused by connective tissue changes, classified as a biomechanical lesion not elsewhere classified.

Connective tissue stenosis of the neural canal affecting the abdominal region or other anatomical regions not captured by more specific M99.4x subcodes — a biomechanical lesion classification used primarily in chiropractic and osteopathic coding contexts.

M99.50 identifies narrowing of the neural canal at the head region caused by intervertebral disc tissue — classified as a biomechanical lesion under the M99 category.

Narrowing of the cervical neural canal caused specifically by intervertebral disc material compressing the spinal canal in the cervical region, classified as a biomechanical lesion.

M99.52 identifies narrowing of the neural canal in the thoracic spine caused specifically by intervertebral disc pathology, classified under biomechanical lesions of the musculoskeletal system.

Narrowing of the lumbar neural canal caused by encroachment from an intervertebral disc, classified as a biomechanical lesion under the M99 category when no more specific structural diagnosis applies.

Narrowing of the neural canal in the sacral spine caused by intervertebral disc pathology, classified as a biomechanical lesion under M99.

Narrowing of the neural canal in the pelvic region caused by intervertebral disc pathology, classified under biomechanical lesions of the musculoskeletal system.

M99.56 identifies intervertebral disc stenosis of the neural canal specifically attributed to biomechanical lesion at the lower extremity region, classified under the M99 biomechanical lesions category.

Narrowing of the neural canal caused by intervertebral disc pathology at a spinal level whose primary neurological impact is on the upper extremities — typically the cervical spine.

Narrowing of the neural canal in the rib cage region caused by intervertebral disc pathology, classified under biomechanical lesions (M99) rather than disc displacement or degeneration categories.

Intervertebral disc stenosis of the neural canal affecting the abdominal region or other regions not captured by more anatomically specific M99.5x codes.