Is Z89.521 a billable ICD-10-CM code?

Yes. Z89.521 is a billable, specific ICD-10-CM code and is valid for submission on a claim.

Where does Z89.521 sit in the tabular list?

Factors influencing health status and contact with health services (Z00-Z99), in the block Persons with potential health hazards related to family and personal history and certain conditions influencing health status (Z77-Z99).

Z89.521

Z89.521 — Acquired absence of right knee

Billable / specific codeICD-10-CMPOA exemptright

Z89.521 is a billable, specific ICD-10-CM code for acquired absence of right knee. It is valid for submission on a claim.

Risk adjustment

Z89.521 does not map to an HCC and does not risk-adjust under CMS-HCC V28. That is normal — most ICD-10 codes do not. It still needs to be coded correctly; it just will not move a RAF score.

Medicare coverage

Z89.521 is named in 9 Medicare coverage policies — 9 listing it as supporting medical necessity. Which of them applies to you depends on your Medicare contractor, and coverage genuinely differs by state.

A53057Billing and Coding: Home Health Occupational Therapy
A53058Billing and Coding: Home Health Physical Therapy
A53065Billing and Coding: Outpatient Physical Therapy
A56796Billing and Coding: Lower Extremity Major Joint Replacement (Hip and Knee)

Code history

Z89.521 has not changed since FY2024 — no addition, revision or deletion across the three most recent ICD-10-CM releases.

Related codes at this level

Codes that share Z89.52. If Z89.521 is not quite right, the correct code is usually one of these.

Questions about Z89.521

Is Z89.521 a billable ICD-10-CM code?: Yes. Z89.521 is a billable, specific ICD-10-CM code and is valid for submission on a claim.
Where does Z89.521 sit in the tabular list?: Factors influencing health status and contact with health services (Z00-Z99), in the block Persons with potential health hazards related to family and personal history and certain conditions influencing health status (Z77-Z99).