Alphabetic Index FY2027

M99

Biomechanical lesions, not elsewhere classified

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 is a non-billable ICD-10-CM code category for biomechanical lesions, not elsewhere classified. 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 M99.0 Segmental and somatic dysfunction, M99.1 Subluxation complex (vertebral), M99.2 Subluxation stenosis of neural canal, M99.3 Osseous stenosis of neural canal 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

This code
  • 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 10