M24.673 Ankylosis, unspecified ankle

Billable ICD-10-CM code, FY2026.

Applies from M24 Other specific joint derangements

Excludes1 (never code together)

• current injury - see injury of joint by body region

Excludes2 (not included here)

• ganglion (M67.4)
• snapping knee (M23.8-)
• temporomandibular joint disorders (M26.6-)

Applies from M24.6 Ankylosis of joint

Excludes1 (never code together)

• stiffness of joint without ankylosis (M25.6-)

Excludes2 (not included here)

• spine (M43.2-)

MS-DRG index

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

Approximate ICD-9-CM (GEMs)

• 718.57 Ankylosis of joint, ankle and foot (approximate)

Code annotations containing back-references to M24.673

Back-references to M24.6

• Type 1 Excludes: M25.6 Stiffness of joint, not elsewhere classified ("ankylosis of joint (M24.6-)")

Nearby codes

• M24.662 Ankylosis, left knee
• M24.669 Ankylosis, unspecified knee
• M24.67 Ankylosis, ankle and foot
• M24.671 Ankylosis, right ankle
• M24.672 Ankylosis, left ankle
• M24.673 Ankylosis, unspecified ankle (this code)
• M24.674 Ankylosis, right foot
• M24.675 Ankylosis, left foot
• M24.676 Ankylosis, unspecified foot
• M24.69 Ankylosis, other specified joint
• M24.7 Protrusio acetabuli