Z96.662 Presence of left artificial ankle joint

Billable ICD-10-CM code, FY2026.

Applies from Z96 Presence of other functional implants

Excludes2 (not included here)

• complications of internal prosthetic devices, implants and grafts (T82-T85)
• fitting and adjustment of prosthetic and other devices (Z44-Z46)

MS-DRG index

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

Approximate ICD-9-CM (GEMs)

• V43.66 Ankle joint replacement (approximate)

Medicare Code Edits (MCE v43.1 (April 2026))

• Unacceptable principal diagnosis: These codes describe a circumstance which influences care but is not a current illness or injury, or capture only an underlying condition, and are unacceptable as principal diagnosis.

Code annotations containing back-references to Z96.662

Back-references to Z96.6

• Use Additional: M97.8 Periprosthetic fracture around other internal prosthetic joint ("code to identify the joint (Z96.6-)")
• Use Additional: T84.018 Broken internal joint prosthesis, other site ("code to identify the joint (Z96.6-)")
• Use Additional: T84.028 Dislocation of other internal joint prosthesis ("code to identify the joint (Z96.6-)")
• Use Additional: T84.038 Mechanical loosening of other internal prosthetic joint ("code to identify the joint (Z96.6-)")
• Use Additional: T84.058 Periprosthetic osteolysis of other internal prosthetic joint ("code to identify the joint (Z96.6-)")
• Use Additional: T84.068 Wear of articular bearing surface of other internal prosthetic joint ("code to identify the joint (Z96.6-)")
• Use Additional: T84.098 Other mechanical complication of other internal joint prosthesis ("code to identify the joint (Z96.6-)")
• Type 1 Excludes: Z18 Retained foreign body fragments ("artificial joint prosthesis status (Z96.6-)")
• Use Additional: Z47.1 Aftercare following joint replacement surgery ("code to identify the joint (Z96.6-)")

Back-references to Z96

• Type 2 Excludes: M96 Intraoperative and postprocedural complications and disorders of musculoskeletal system, not elsewhere classified ("presence of functional implants and other devices (Z96-Z97)")
• Type 1 Excludes: Z18 Retained foreign body fragments ("organ or tissue replaced by means other than transplant (Z96.-, Z97.-)")
• Type 2 Excludes: Z46 Encounter for fitting and adjustment of other devices ("presence of prosthetic and other devices (Z95-Z97)")
• Type 2 Excludes: Z78 Other specified health status ("postprocedural status (Z93-Z99)")
• Type 2 Excludes: Z87.7 Personal history of (corrected) congenital malformations ("presence of other functional implants (Z96.-)")

Nearby codes

• Z96.652 Presence of left artificial knee joint
• Z96.653 Presence of artificial knee joint, bilateral
• Z96.659 Presence of unspecified artificial knee joint
• Z96.66 Presence of artificial ankle joint
• Z96.661 Presence of right artificial ankle joint
• Z96.662 Presence of left artificial ankle joint (this code)
• Z96.669 Presence of unspecified artificial ankle joint
• Z96.69 Presence of other orthopedic joint implants
• Z96.691 Finger-joint replacement of right hand
• Z96.692 Finger-joint replacement of left hand
• Z96.693 Finger-joint replacement, bilateral