Z91.0 – Allergy status, other than to drugs and biological substances

ICD-10-CM 2027 diagnosis code · Persons with potential health hazards related to family and personal history and certain conditions influencing health status

Non-billable header

ICD-10-CM code Z91.0

Code: Z91.0 (claims format: Z910)
Description: Allergy status, other than to drugs and biological substances
Short description: Allergy status, oth than to drugs and biological substances
Billable: No – use a more specific code below
Valid for: Dates of service October 1, 2026 – September 30, 2027 (FY2027)
Chapter: 21. Factors influencing health status and contact with health services (Z00-Z99)
Block: Z77-Z99 Persons with potential health hazards related to family and personal history and certain conditions influencing health status
Parent codes: Z91

Billable codes under Z91.0

Z91.0 is a header code and cannot be used on claims. Choose the most specific code:

Z91.01 – Food allergy statusHeader (more codes below)
Z91.02 – Food additives allergy statusBillable
Z91.03 – Insect allergy statusHeader (more codes below)
Z91.04 – Nonmedicinal substance allergy statusHeader (more codes below)
Z91.09 – Other allergy status, other than to drugs and biological substancesBillable

Notes for Z91.0

Excludes2 (not included here):

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

Notes inherited from parent codes

Instructional notes at a category or block level apply to every code below it.

Z91 – Personal risk factors, not elsewhere classified

Excludes2 (not included here):

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-)

Block Z77-Z99

Code also:

any follow-up examination (Z08-Z09)

Related codes in Z91

Frequently asked questions

What is ICD-10 code Z91.0?

Z91.0 is the ICD-10-CM code for allergy status, other than to drugs and biological substances, in the block Z77-Z99 (Persons with potential health hazards related to family and personal history and certain conditions influencing health status).

Is Z91.0 a billable code?

No. Z91.0 is a header code with more specific child codes; report one of the billable codes listed above.

What category does Z91.0 belong to?

It belongs to category Z91 – Personal risk factors, not elsewhere classified.

Source: CDC/NCHS ICD-10-CM FY2027 code files, tabular list and index. Reference only – code assignment must follow the official ICD-10-CM guidelines and documentation in the medical record.