ICD-10-CM 2027 diagnosis code
Z91Personal risk factors, not elsewhere classified
Z91 is a header code, so it can't be reported by itself. Choose one of the 7 more specific codes beneath it.
Code unchanged since ICD-10-CM took effect on October 1, 2015. Source: official FY2027 ICD-10-CM release from CDC/NCHS and CMS. Page updated September 29, 2026. About our data
About Z91
Z91 is the ICD-10-CM diagnosis code for personal risk factors, not elsewhere classified. It belongs to block Z77-Z99 (persons with potential health hazards related to family and personal history and certain conditions influencing health status) and chapter 21 (factors influencing health status and contact with health services). It is a header code, so it can't be reported by itself; one of its 7 subcodes must be used instead.
To report this condition, pick the subcode that matches the documentation: Z91.0 (substances), Z91.1 (regimen), Z91.4 (classified), Z91.5 (self-harm), Z91.8 (classified), Z91.A (regimen) and Z91.B (diethylstilbestrol).
The conditions in its Excludes2 note aren't part of Z91, but may be coded alongside it if the patient has both: 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.-) and 1 more.
It has been part of ICD-10-CM since the code set took effect on October 1, 2015 and hasn't changed since.
Specific codes under Z91
- Z91.0Allergy status, other than to drugs and biological substances
- Z91.01Food allergy status
- Z91.02Food additives allergy statusBillable
- Z91.03Insect allergy status
- Z91.04Nonmedicinal substance allergy status
- Z91.09Other allergy status, other than to drugs and biological substancesBillable
- Z91.1Patient's noncompliance with medical treatment and regimen
- Z91.11Patient's noncompliance with dietary regimen
- Z91.12Patient's intentional underdosing of medication regimen
- Z91.13Patient's unintentional underdosing of medication regimen
- Z91.14Patient's other noncompliance with medication regimen
- Z91.15Patient's noncompliance with renal dialysis
- Z91.19Patient's noncompliance with other medical treatment and regimen
- Z91.190Patient's noncompliance with other medical treatment and regimen due to financial hardshipBillable
- Z91.198Patient's noncompliance with other medical treatment and regimen for other reasonBillable
- Z91.199Patient's noncompliance with other medical treatment and regimen due to unspecified reasonBillable
- Z91.4Personal history of psychological trauma, not elsewhere classified
- Z91.41Personal history of adult abuse
- Z91.410Personal history of adult physical and sexual abuseBillable
- Z91.411Personal history of adult psychological abuseBillable
- Z91.412Personal history of adult neglectBillable
- Z91.413Personal history of adult financial abuseBillable
- Z91.414Personal history of adult intimate partner abuseBillable
- Z91.419Personal history of unspecified adult abuseBillable
- Z91.42Personal history of forced labor or sexual exploitationBillable
- Z91.49Other personal history of psychological trauma, not elsewhere classifiedBillable
- Z91.41Personal history of adult abuse
- Z91.5Personal history of self-harm
- Z91.8Other specified personal risk factors, not elsewhere classified
- Z91.ACaregiver's noncompliance with patient's medical treatment and regimen
- Z91.A1Caregiver's noncompliance with patient's dietary regimen
- Z91.A2Caregiver's intentional underdosing of patient's medication regimen
- Z91.A3Caregiver's unintentional underdosing of patient's medication regimenBillable
- Z91.A4Caregiver's other noncompliance with patient's medication regimen
- Z91.A5Caregiver's noncompliance with patient's renal dialysis
- Z91.A9Caregiver's noncompliance with patient's other medical treatment and regimen
- Z91.BPersonal risk factor of exposure to diethylstilbestrolBillable
Coding notes
Notes that apply from higher levels
Instructions written at a parent level also apply to Z91.
Code history
- 2016
- 2017
- 2018
- 2019
- 2020
- 2021
- 2022
- 2023
- 2024
- 2025
- 2026
- 2027
- FY2016 (effective 10/1/2015): Added (first year of ICD-10-CM)
- No changes since FY2016.
Common questions about Z91
Is Z91 billable?
- No. Z91 is a header code. Report one of its more specific subcodes instead.