M21.8
Other specified acquired deformities of limbs
M21.8 is a non-billable ICD-10-CM code header for other specified acquired deformities of limbs. 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 M21.80 Other specified acquired deformities of unspecified limb, M21.82 Other specified acquired deformities of upper arm, M21.83 Other specified acquired deformities of forearm, M21.85 Other specified acquired deformities of thigh and 1 more. Its coding notes include 3 Excludes1 entries and 14 Excludes2 entries.
Excludes1
Not coded here. The listed conditions generally should not be reported together.
Excludes2
Not included here. Both codes may be reported if the patient has both conditions.
- coxa plana (M91.2)
Also from chapter/block level (11 notes)
- 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
Also from chapter/block level (1 note)
- 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 M21.8 5
- M21.80Other specified acquired deformities of unspecified limbBillable
- M21.82Other specified acquired deformities of upper armHeader
- M21.83Other specified acquired deformities of forearmHeader
- M21.85Other specified acquired deformities of thighHeader
- M21.86Other specified acquired deformities of lower legHeader