M22.91 Unspecified disorder of patella, right 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)

• 717.9 Unspecified internal derangement of knee (approximate)

Nearby codes

• M22.8X1 Other disorders of patella, right knee
• M22.8X2 Other disorders of patella, left knee
• M22.8X9 Other disorders of patella, unspecified knee
• M22.9 Unspecified disorder of patella
• M22.90 Unspecified disorder of patella, unspecified knee
• M22.91 Unspecified disorder of patella, right knee (this code)
• M22.92 Unspecified disorder of patella, left knee