• All Diagnostic Codes
• Diseases of the musculoskeletal system and connective tissue (M00-M99)
• Other joint disorders (M20-M25)
• M21 - Other acquired deformities of limbs
  • M21.0 - Valgus deformity, not elsewhere classified
  • M21.1 - Varus deformity, not elsewhere classified
  • M21.2 - Flexion deformity
  • M21.3 - Wrist or foot drop (acquired)
  • M21.4 - Flat foot [pes planus] (acquired)
  • M21.5 - Acquired clawhand, clubhand, clawfoot and clubfoot
  • M21.6 - Other acquired deformities of foot
  • M21.7 - Unequal limb length (acquired)
  • M21.8 - Other specified acquired deformities of limbs
  • M21.9 - Unspecified acquired deformity of limb and hand

M21 is a valid ICD-10-CM diagnosis code meaning 'Other acquired deformities of limbs'.

Purely Excluded Conditions

These diag codes should never be used at the same time as M21 because these conditions cannot occur together:

• acquired absence of limb (Z89.-)
• congenital absence of limbs (Q71-Q73)
• congenital deformities and malformations of limbs (Q65-Q66, Q68-Q74)

Separate Conditions Not Covered By M21

These conditions are is not covered by M21:

• acquired deformities of fingers or toes (M20.-)
• coxa plana (M91.2)

A patient may have both conditions at the same time, but both conditions must be coded separately.