M25.373 Other instability, 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-)

Applies from M25.3 Other instability of joint

Excludes1 (never code together)

• instability of joint secondary to old ligament injury (M24.2-)
• instability of joint secondary to removal of joint prosthesis (M96.8-)

Excludes2 (not included here)

• spinal instabilities (M53.2-)

MS-DRG index

Defines the logic of DRG(s) 564-566 in MDC 08.

Approximate ICD-9-CM (GEMs)

• 718.87 Other joint derangement, not elsewhere classified, ankle and foot (approximate)

Nearby codes

• M25.362 Other instability, left knee
• M25.369 Other instability, unspecified knee
• M25.37 Other instability, ankle and foot
• M25.371 Other instability, right ankle
• M25.372 Other instability, left ankle
• M25.373 Other instability, unspecified ankle (this code)
• M25.374 Other instability, right foot
• M25.375 Other instability, left foot
• M25.376 Other instability, unspecified foot
• M25.39 Other instability, other specified joint
• M25.4 Effusion of joint