M22.40 Chondromalacia patellae, unspecified knee

Billable ICD-10-CM code, FY2026.

Applies from M22 Disorder of patella

Excludes2 (not included here)

• traumatic dislocation of patella (S83.0-)

MS-DRG index

Defines the logic of DRG(s) 562-563 in MDC 08.

Approximate ICD-9-CM (GEMs)

• 717.7 Chondromalacia of patella (approximate)

Code annotations containing back-references to M22.40

Back-references to M22.4

• Type 1 Excludes: M94.2 Chondromalacia ("chondromalacia patellae (M22.4)")

Nearby codes

• M22.3X Other derangements of patella
• M22.3X1 Other derangements of patella, right knee
• M22.3X2 Other derangements of patella, left knee
• M22.3X9 Other derangements of patella, unspecified knee
• M22.4 Chondromalacia patellae
• M22.40 Chondromalacia patellae, unspecified knee (this code)
• M22.41 Chondromalacia patellae, right knee
• M22.42 Chondromalacia patellae, left knee
• M22.8 Other disorders of patella
• M22.8X Other disorders of patella
• M22.8X1 Other disorders of patella, right knee