M99.00 Segmental and somatic dysfunction of head region

Billable ICD-10-CM code, FY2026.

Applies from M99 Biomechanical lesions, not elsewhere classified

Notes

• This category should not be used if the condition can be classified elsewhere.

MS-DRG index

Defines the logic of DRG(s) 555-556 in MDC 08.

Approximate ICD-9-CM (GEMs)

• 739.0 Nonallopathic lesions, head region (approximate)

Code annotations containing back-references to M99.00

Back-references to M99

• Type 1 Excludes: M43.5 Other recurrent vertebral dislocation ("biomechanical lesions NEC (M99.-)")

Diagnosis Index entries for M99.00

• Dysfunction › somatic › head region
• Dysfunction › somatic › occipitocervical

Nearby codes

• M99 Biomechanical lesions, not elsewhere classified
• M99.0 Segmental and somatic dysfunction
• M99.00 Segmental and somatic dysfunction of head region (this code)
• M99.01 Segmental and somatic dysfunction of cervical region
• M99.02 Segmental and somatic dysfunction of thoracic region
• M99.03 Segmental and somatic dysfunction of lumbar region
• M99.04 Segmental and somatic dysfunction of sacral region
• M99.05 Segmental and somatic dysfunction of pelvic region