Z91 – Personal risk factors, not elsewhere classified

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

Code: Z91 (claims format: Z91)
Description: Personal risk factors, not elsewhere classified
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

Billable codes under Z91

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

Z91.0 – Allergy status, other than to drugs and biological substancesHeader (more codes below)
Z91.1 – Patient's noncompliance with medical treatment and regimenHeader (more codes below)
Z91.A – Caregiver's noncompliance with patient's medical treatment and regimenHeader (more codes below)
Z91.4 – Personal history of psychological trauma, not elsewhere classifiedHeader (more codes below)
Z91.5 – Personal history of self-harmHeader (more codes below)
Z91.8 – Other specified personal risk factors, not elsewhere classifiedHeader (more codes below)
Z91.B – Personal risk factor of exposure to diethylstilbestrolBillable

Notes for Z91

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-)

Notes inherited from parent codes

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

Block Z77-Z99

Code also:

any follow-up examination (Z08-Z09)

Frequently asked questions

What is ICD-10 code Z91?

Z91 is the ICD-10-CM code for personal risk factors, not elsewhere classified, in the block Z77-Z99 (Persons with potential health hazards related to family and personal history and certain conditions influencing health status).

Is Z91 a billable code?

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

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.