Z91 ICD-10-CA category: Personal history of risk-factors, not elsewhere classified
Z91 isn’t a code on its own. Choose one of the 9 codes beneath it, the one the documentation supports.
Official description
Z91Personal history of risk-factors, not elsewhere classified
ICD-10-CA · Canada
Codes in Z91
Z91 isn’t a code on its own. Open the code that matches what the note documents.
Z91.0Personal history of allergy, other than to drugs and biological substancesZ91.1Personal history of noncompliance with medical treatment and regimenZ91.2Personal history of poor personal hygieneZ91.3Personal history of unhealthy sleep-wake scheduleZ91.4Personal history of psychological trauma, not elsewhere classifiedZ91.5Personal history of self-harmZ91.6Personal history of other physical traumaZ91.7Personal history of female genital mutilationZ91.8Personal history of other specified risk-factors, not elsewhere classifiedNotes for Z91
As CIHI prints them, with any note Z91 takes from the headings above it.
Excludes
Conditions classified elsewhere.
- Exposure to pollution and other problems related to physical environment (Z58.-)occupational exposure to risk-factors (Z57.-)personal history of psychoactive substance abuse (Z86.4)
- Follow-up examination (Z08-Z09)follow-up medical care and convalescence (Z42-Z51, Z54.-)when family or personal history is the reason for special screening or other examination or investigation (Z00-Z13)when the possibility that the fetus might be affected is the reason for observation or action during pregnancy (O35.-)From Z80-Z99 Persons with potential health hazards related to family and personal history and certain conditions influencing health status
Note
- This chapter should not be used for international comparison or for primary mortality coding.Categories Z00-Z99 are provided for occasions when circumstances other than a disease, injury or external cause classifiable to categories A00-Y89 are recorded as "diagnoses" or "problems". This can arise in two main ways:(a) When a person who may or may not be sick encounters the health services for some specific purpose, such as to receive limited care or service for a current condition, to donate an organ or tissue, to receive prophylactic vaccination or to discuss a problem which is in itself not a disease or injury.(b) When some circumstance or problem is present which influences the person's health status but is not in itself a current illness or injury. Such factors may be elicited during population surveys, when the person may or may not be currently sick, or be recorded as an additional factor to be borne in mind when the person is receiving care for some illness or injury.From Chapter 21: Factors influencing health status and contact with health services (Z00-Z99)
Where Z91 sits
- 1ChapterChapter 21: Factors influencing health status and contact with health services (Z00-Z99)
- 2Block Z80-Z99Persons with potential health hazards related to family and personal history and certain conditions influencing health status
- 3Category Z91Personal history of risk-factors, not elsewhere classified
Source and release
- Data release
- ICD-10-CA · FY 2026–2027
- Effective date
- Apr 1, 2026
- Publisher
- CIHI
This page is built from the ICD-10-CA catalog that Vero Codes reads when it suggests codes: Canadian Institute for Health Information’s FY 2026–2027 release, imported from the publisher’s file and checked against it. The description, notes and structured data come from the same record.
Frequently asked questions
Is Z91 a valid ICD-10-CA code?
No. Z91 (Personal history of risk-factors, not elsewhere classified) is a category heading in CIHI’s ICD-10-CA FY 2026–2027 release. It holds 9 codes; record the one the documentation supports.
Where is Z91 in ICD-10-CA?
Z91 sits under Z80-Z99 Persons with potential health hazards related to family and personal history and certain conditions influencing health status, within Chapter 21: Factors influencing health status and contact with health services (Z00-Z99).
What coding notes apply to Z91?
ICD-10-CA lists Excludes, Note notes for Z91, including those from the headings it sits under. They are listed on this page with where each one comes from.
Which ICD-10-CA release does this page use?
It uses CIHI’s FY 2026–2027 release, in effect from Apr 1, 2026 to Mar 31, 2027. It is a reference: confirm the code against the current list and the payer’s rules before you submit it.
Codes beside Z91
View Z80-Z99Z80Family history of malignant neoplasmZ81Family history of mental and behavioural disordersZ82Family history of certain disabilities and chronic diseases leading to disablementZ83Family history of other specific disordersZ84Family history of other conditionsZ85Personal history of malignant neoplasmZ86Personal history of certain other diseasesZ87Personal history of other diseases and conditionsZ88Personal history of allergy to drugs, medicaments and biological substancesZ89Acquired absence of limbZ90Acquired absence of organs, not elsewhere classifiedZ92Personal history of medical treatmentZ93Artificial opening statusZ94Transplanted organ and tissue statusZ95Presence of cardiac and vascular implants and graftsZ96Presence of other functional implantsZ97Presence of other devicesZ98Other postsurgical statesZ99Dependence on enabling machines and devices, not elsewhere classified