Is Z89.422 a billable ICD-10-CM code?

Yes. Z89.422 is a billable, specific ICD-10-CM code and is valid for submission on a claim.

Where does Z89.422 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).

What cannot be coded together with Z89.422?

Z89.422 carries Excludes1 notes, which means the conditions they list can never be coded together with it on the same encounter. Some are written on the categories above Z89.422 (Z89) and apply to it just the same.

Z89.422

Z89.422 — Acquired absence of other left toe(s)

Billable / specific codeICD-10-CMPOA exemptleft

Z89.422 is a billable, specific ICD-10-CM code for acquired absence of other left toe(s). It is valid for submission on a claim.

Excludes1 inherited from the categories above Z89.422

These are not written on Z89.422, but they bind it: a note on a category applies to every code beneath it. Billing Z89.422 with anything listed here is a denial.

Written on Z89 — Acquired absence of limb

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

Excludes2 inherited from the categories above Z89.422

Also inherited, and the opposite of Excludes1: these conditions are not part of Z89.422, but a patient can have both, so you may code both.

Written on Z89.42 — Acquired absence of other toe(s)

acquired absence of great toe (Z89.41-)

Other codes that can never be billed with Z89.422

These codes carry an Excludes1 note pointing at Z89.422. The conflict binds both ways, but ICD-10-CM only writes it down on one side — so you would not find this by reading Z89.422 alone.

M20Acquired deformities of fingers and toes
M21Other acquired deformities of limbs

Risk adjustment

Z89.422 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

Z89.422 is named in 3 Medicare coverage policies — 3 listing it as supporting medical necessity. Which of them applies to you depends on your Medicare contractor, and coverage genuinely differs by state.

A53058Billing and Coding: Home Health Physical Therapy
A53065Billing and Coding: Outpatient Physical Therapy
A57311Billing and Coding: Physical Therapy - Home Health

Code history

Z89.422 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 Z89.42. If Z89.422 is not quite right, the correct code is usually one of these.

Questions about Z89.422

Is Z89.422 a billable ICD-10-CM code?: Yes. Z89.422 is a billable, specific ICD-10-CM code and is valid for submission on a claim.
Where does Z89.422 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).
What cannot be coded together with Z89.422?: Z89.422 carries Excludes1 notes, which means the conditions they list can never be coded together with it on the same encounter. Some are written on the categories above Z89.422 (Z89) and apply to it just the same.