M13.171 Monoarthritis, not elsewhere classified, right ankle and foot

Billable ICD-10-CM code, FY2026.

Applies from M13 Other arthritis

Excludes1 (never code together)

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

MS-DRG index

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

Approximate ICD-9-CM (GEMs)

• 716.67 Unspecified monoarthritis, ankle and foot (approximate)

Nearby codes

• M13.16 Monoarthritis, not elsewhere classified, knee
• M13.161 Monoarthritis, not elsewhere classified, right knee
• M13.162 Monoarthritis, not elsewhere classified, left knee
• M13.169 Monoarthritis, not elsewhere classified, unspecified knee
• M13.17 Monoarthritis, not elsewhere classified, ankle and foot
• M13.171 Monoarthritis, not elsewhere classified, right ankle and foot (this code)
• M13.172 Monoarthritis, not elsewhere classified, left ankle and foot
• M13.179 Monoarthritis, not elsewhere classified, unspecified ankle and foot
• M13.8 Other specified arthritis
• M13.80 Other specified arthritis, unspecified site
• M13.81 Other specified arthritis, shoulder