M13.879 Other specified arthritis, unspecified ankle and foot

Billable ICD-10-CM code, FY2026.

Applies from M13 Other arthritis

Excludes1 (never code together)

• arthrosis (M15-M19)
• osteoarthritis (M15-M19)

Applies from M13.8 Other specified arthritis

Applicable to

• Allergic arthritis

Excludes1 (never code together)

• osteoarthritis (M15-M19)

MS-DRG index

Defines the logic of DRG(s) 553-554 in MDC 08.

Approximate ICD-9-CM (GEMs)

• 716.27 Allergic arthritis, ankle and foot (approximate)

Nearby codes

• M13.862 Other specified arthritis, left knee
• M13.869 Other specified arthritis, unspecified knee
• M13.87 Other specified arthritis, ankle and foot
• M13.871 Other specified arthritis, right ankle and foot
• M13.872 Other specified arthritis, left ankle and foot
• M13.879 Other specified arthritis, unspecified ankle and foot (this code)
• M13.88 Other specified arthritis, other site
• M13.89 Other specified arthritis, multiple sites