M21.96 Unspecified acquired deformity of lower leg

Non-billable header with 3 child codes.

Applies from M21 Other acquired deformities of limbs

Excludes1 (never code together)

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

Excludes2 (not included here)

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

Codes under M21.96

• M21.961 Unspecified acquired deformity of right lower leg
• M21.962 Unspecified acquired deformity of left lower leg
• M21.969 Unspecified acquired deformity of unspecified lower leg

Code annotations containing back-references to M21.96

Back-references to M21

• Type 1 Excludes: M23 Internal derangement of knee ("deformity of knee (M21.-)")
• Type 2 Excludes: M24.5 Contracture of joint ("acquired deformities of limbs (M20-M21)")
• Type 2 Excludes: M25 Other joint disorder, not elsewhere classified ("acquired deformities of limb (M20-M21)")
• Type 2 Excludes: M95 Other acquired deformities of musculoskeletal system and connective tissue ("acquired deformities of limbs (M20-M21)")
• Type 1 Excludes: Z89 Acquired absence of limb ("acquired deformities of limbs (M20-M21)")

Diagnosis Index entries for M21.96

• Deformity › joint (acquired) NEC › knee
• Deformity › limb (acquired) › lower leg

Nearby codes

• M21.949 Unspecified acquired deformity of hand, unspecified hand
• M21.95 Unspecified acquired deformity of thigh
• M21.951 Unspecified acquired deformity of right thigh
• M21.952 Unspecified acquired deformity of left thigh
• M21.959 Unspecified acquired deformity of unspecified thigh
• M21.96 Unspecified acquired deformity of lower leg (this code)
• M21.961 Unspecified acquired deformity of right lower leg
• M21.962 Unspecified acquired deformity of left lower leg
• M21.969 Unspecified acquired deformity of unspecified lower leg