Is Z91.09 a billable ICD-10-CM code?

Yes. Z91.09 is a billable, specific ICD-10-CM code and is valid for submission on a claim.

Where does Z91.09 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).

Z91.09

Z91.09 — Other allergy status, other than to drugs and biological substances

Billable / specific codeICD-10-CMPOA exempt

Z91.09 is a billable, specific ICD-10-CM code for other allergy status, other than to drugs and biological substances. It is valid for submission on a claim.

Excludes2 inherited from the categories above Z91.09

Also inherited, and the opposite of Excludes1: these conditions are not part of Z91.09, but a patient can have both, so you may code both.

Written on Z91.0 — Allergy status, other than to drugs and biological substances

Allergy status to drugs, medicaments, and biological substances (Z88.-)

Written on Z91 — Personal risk factors, not elsewhere classified

contact with and (suspected) exposures hazardous to health (Z77.-)
exposure to pollution and other problems related to physical environment (Z77.1-)
female genital mutilation status (N90.81-)
occupational exposure to risk factors (Z57.-)
personal history of physical injury and trauma (Z87.81, Z87.82-)

Risk adjustment

Z91.09 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

Z91.09 is named in 15 Medicare coverage policies — 15 listing it as supporting medical necessity. Which of them applies to you depends on your Medicare contractor, and coverage genuinely differs by state.

A56844Billing and Coding: RAST Type Tests
A57043Billing and Coding: RAST Type Tests
A57473Billing and Coding: Allergy Testing
A57473Billing and Coding: Allergy Testing

How Z91.09 is indexed

Coders do not find codes by browsing the tabular list — they look them up in the alphabetic index, under the word the physician wrote. These are the index entries that lead here, so you can see which chart wordings map to Z91.09.

History›personal›allergy›specified NEC

Code history

Z91.09 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 Z91.0. If Z91.09 is not quite right, the correct code is usually one of these.

Questions about Z91.09

Is Z91.09 a billable ICD-10-CM code?: Yes. Z91.09 is a billable, specific ICD-10-CM code and is valid for submission on a claim.
Where does Z91.09 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).