Alphabetic Index FY2027

M99.0

Segmental and somatic dysfunction

FY2027Chapter 13: Diseases of the musculoskeletal system and connective tissue/M99 Biomechanical lesions, not elsewhere classified

Non-billable headerNot valid on its own. Use one of the more specific codes under it.

M99.0 is a non-billable ICD-10-CM code header for segmental and somatic dysfunction. Report a more specific code from it instead. It is part of the FY2027 code set, effective October 1, 2026. The more specific codes under it are M99.00 Segmental and somatic dysfunction of head region, 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 and 6 more. Its coding notes include 10 Excludes2 entries.

Excludes2

Not included here. Both codes may be reported if the patient has both conditions.

Also from chapter/block level (10 notes)
Inherited from Chapter 13 Diseases of the musculoskeletal system and connective tissue
  • arthropathic psoriasis (L40.5-)
  • certain conditions originating in the perinatal period (P04-P96)
  • certain infectious and parasitic diseases (A00-B99)
  • compartment syndrome (traumatic) (T79.A-)
  • complications of pregnancy, childbirth and the puerperium (O00-O9A)
  • congenital malformations, deformations, and chromosomal abnormalities (Q00-Q99)
  • endocrine, nutritional and metabolic diseases (E00-E88)
  • injury, poisoning and certain other consequences of external causes (S00-T88)
  • neoplasms (C00-D49)
  • symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R94)

Notes

Inherited from M99 Biomechanical lesions, not elsewhere classified
  • This category should not be used if the condition can be classified elsewhere.
Also from chapter/block level (1 note)
Inherited from Chapter 13 Diseases of the musculoskeletal system and connective tissue
  • Use an external cause code following the code for the musculoskeletal condition, if applicable, to identify the cause of the musculoskeletal condition

More specific codes under M99.0 10