M25.173 Fistula, unspecified ankle

Billable ICD-10-CM code, FY2026.

Applies from M25 Other joint disorder, not elsewhere classified

Excludes2 (not included here)

• abnormality of gait and mobility (R26.-)
• acquired deformities of limb (M20-M21)
• calcification of bursa (M71.4-)
• calcification of shoulder (joint) (M75.3)
• calcification of tendon (M65.2-)
• difficulty in walking (R26.2)
• temporomandibular joint disorder (M26.6-)

MS-DRG index

Defines the logic of DRG(s) 555-556 in MDC 08.

Approximate ICD-9-CM (GEMs)

• 719.87 Other specified disorders of joint, ankle and foot (approximate)

Nearby codes

• M25.162 Fistula, left knee
• M25.169 Fistula, unspecified knee
• M25.17 Fistula, ankle and foot
• M25.171 Fistula, right ankle
• M25.172 Fistula, left ankle
• M25.173 Fistula, unspecified ankle (this code)
• M25.174 Fistula, right foot
• M25.175 Fistula, left foot
• M25.176 Fistula, unspecified foot
• M25.18 Fistula, other specified site
• M25.2 Flail joint