M21 Other acquired deformities of limbs

ICD-10-CM category M21 sits in Chapter 13 (Diseases of the musculoskeletal system and connective tissue, M00-M99). It contains 124 billable codes for FY2027, effective October 1, 2026 to September 30, 2027. Always code to the most specific code available: a code with more characters that describes the diagnosis more precisely takes priority over a shorter one.

Subcategories

M21.0 Valgus deformity, not elsewhere classifiedM21.02 Valgus deformity, not elsewhere classified, elbowM21.05 Valgus deformity, not elsewhere classified, hipM21.06 Valgus deformity, not elsewhere classified, kneeM21.07 Valgus deformity, not elsewhere classified, ankleM21.1 Varus deformity, not elsewhere classifiedM21.12 Varus deformity, not elsewhere classified, elbowM21.15 Varus deformity, not elsewhere classified, hipM21.16 Varus deformity, not elsewhere classified, kneeM21.17 Varus deformity, not elsewhere classified, ankleM21.2 Flexion deformityM21.21 Flexion deformity, shoulderM21.22 Flexion deformity, elbowM21.23 Flexion deformity, wristM21.24 Flexion deformity, finger jointsM21.25 Flexion deformity, hipM21.26 Flexion deformity, kneeM21.27 Flexion deformity, ankle and toesM21.3 Wrist or foot drop (acquired)M21.33 Wrist drop (acquired)M21.37 Foot drop (acquired)M21.4 Flat foot [pes planus] (acquired)M21.5 Acquired clawhand, clubhand, clawfoot and clubfootM21.51 Acquired clawhandM21.52 Acquired clubhandM21.53 Acquired clawfootM21.54 Acquired clubfootM21.6 Other acquired deformities of footM21.61 BunionM21.62 BunionetteM21.6X Other acquired deformities of footM21.7 Unequal limb length (acquired)M21.72 Unequal limb length (acquired), humerusM21.73 Unequal limb length (acquired), ulna and radiusM21.75 Unequal limb length (acquired), femurM21.76 Unequal limb length (acquired), tibia and fibulaM21.8 Other specified acquired deformities of limbsM21.82 Other specified acquired deformities of upper armM21.83 Other specified acquired deformities of forearmM21.85 Other specified acquired deformities of thigh

Billable codes in M21

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