Z89.529 Acquired absence of unspecified knee

Billable ICD-10-CM code, FY2026. Exempt from present-on-admission (POA) reporting.

Applies from Z89 Acquired absence of limb

Includes

• amputation status
• postprocedural loss of limb
• post-traumatic loss of limb

Excludes1 (never code together)

• acquired deformities of limbs (M20-M21)
• congenital absence of limbs (Q71-Q73)

Applies from Z89.52 Acquired absence of knee

Applicable to

• Acquired absence of knee joint following explantation of knee joint prosthesis, with or without presence of antibiotic-impregnated cement spacer

MS-DRG index

Defines the logic of DRG(s) 951 in MDC 23.

Approximate ICD-9-CM (GEMs)

• V88.22 Acquired absence of knee joint (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 Z89.529

Back-references to Z89.52

• Type 1 Excludes: Z47.33 Aftercare following explantation of knee joint prosthesis ("acquired absence of knee joint following prior explantation of knee prosthesis (Z89.52-")
• Type 1 Excludes: Z47.33 Aftercare following explantation of knee joint prosthesis ("knee joint prosthesis explantation status (Z89.52-)")

Back-references to Z89

• Type 1 Excludes: M20 Acquired deformities of fingers and toes ("acquired absence of fingers and toes (Z89.-)")
• Type 1 Excludes: M21 Other acquired deformities of limbs ("acquired absence of limb (Z89.-)")
• Type 2 Excludes: M95 Other acquired deformities of musculoskeletal system and connective tissue ("acquired absence of limbs and organs (Z89-Z90)")
• Use Additional: Z47.81 Encounter for orthopedic aftercare following surgical amputation ("code to identify the limb amputated (Z89.-)")

Nearby codes

• Z89.512 Acquired absence of left leg below knee
• Z89.519 Acquired absence of unspecified leg below knee
• Z89.52 Acquired absence of knee
• Z89.521 Acquired absence of right knee
• Z89.522 Acquired absence of left knee
• Z89.529 Acquired absence of unspecified knee (this code)
• Z89.6 Acquired absence of leg above knee
• Z89.61 Acquired absence of leg above knee
• Z89.611 Acquired absence of right leg above knee
• Z89.612 Acquired absence of left leg above knee
• Z89.619 Acquired absence of unspecified leg above knee