M21.26 Flexion deformity, knee

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 M21.26

• M21.261 Flexion deformity, right knee
• M21.262 Flexion deformity, left knee
• M21.269 Flexion deformity, unspecified knee

Code annotations containing back-references to M21.26

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 M21.26

• Deformity › limb (acquired) › flexion › knee

Nearby codes

• M21.249 Flexion deformity, unspecified finger joints
• M21.25 Flexion deformity, hip
• M21.251 Flexion deformity, right hip
• M21.252 Flexion deformity, left hip
• M21.259 Flexion deformity, unspecified hip
• M21.26 Flexion deformity, knee (this code)
• M21.261 Flexion deformity, right knee
• M21.262 Flexion deformity, left knee
• M21.269 Flexion deformity, unspecified knee
• M21.27 Flexion deformity, ankle and toes
• M21.271 Flexion deformity, right ankle and toes