M21.1
Varus deformity, not elsewhere classified
M21.1 is a non-billable ICD-10-CM code header for varus deformity, 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 M21.10 Varus deformity, not elsewhere classified, unspecified site; M21.12 Varus deformity, not elsewhere classified, elbow; M21.15 Varus deformity, not elsewhere classified, hip; M21.16 Varus deformity, not elsewhere classified, knee and 1 more. Its coding notes include 5 Excludes1 entries and 13 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.
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 M21.1 5
- M21.10Varus deformity, not elsewhere classified, unspecified siteBillable
- M21.12Varus deformity, not elsewhere classified, elbowHeader
- M21.15Varus deformity, not elsewhere classified, hipHeader
- M21.16Varus deformity, not elsewhere classified, kneeHeader
- M21.17Varus deformity, not elsewhere classified, ankleHeader