Z91.09
Other allergy status, other than to drugs and biological substances
This code does not map to a risk-adjusting HCC in the loaded models.
Coding notes
Excludes 1 never coded together · Excludes 2 may co-exist
Allergy status to drugs, medicaments, and biological substances (Z88.-)
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-)
any follow-up examination (Z08-Z09)
Z codes represent reasons for encounters. A corresponding procedure code must accompany a Z code if a procedure is performed. 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 (immunization), 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.
Official Guidelines for Z91.09
FY 2026 ›Sections that reference Z91.09
- I.C.18.dRepeated fallsChapter 18
… Code Z91.81, History of falling, is for use when a patient has fallen in the past and is at risk for future falls. …
- I.C.19.e.5)(c)UnderdosingChapter 19
… Noncompliance (Z91.12-, Z91.13-, Z91.14- and Z91.A4-) or complication of care (Y63.6-Y63.9) codes are to be used with an underdosing code to …
- I.C.21.c.3)Status
… and biological substances status Z89 Acquired absence of limb Z90 Acquired absence of organs, not elsewhere classified Z91.0- Allergy status, other than to drugs and biological substances Z92.82 Status post administration of tPA (rtPA) in a different …
- I.C.21.c.4)History (of)
… of malignant neoplasm Z86 Personal history of certain other diseases Z87 Personal history of other diseases and conditions Z91.4- Personal history of psychological trauma, not elsewhere classified Z91.5- Personal history of self-harm Z91.81 History of …
- I.C.21.c.13)Miscellaneous Z Codes
… Healthy person accompanying sick person Z76.4 Other boarder to healthcare facility Z76.5 Malingerer [conscious simulation] Z91.1- Patient’s noncompliance with medical treatment and regimen Z91.A- Caregiver’s noncompliance with patient’s medical treatment …
- I.B.3Code or codes from A00.0 through T88.9, Z00-Z99.8, U00-U85Conventions & general rules
The appropriate code or codes from A00.0 through T88.9, Z00-Z99.8, and U00-U85 must be used to identify diagnoses, symptoms, conditions, problems, complaints or other reason(s) for the …
Showing 6 of 9. Search the guidelines for Z91. Sections whose FY 2026 text names Z91.09, its Z91 category, or a range containing it — the chapter guidance above is the authoritative source.
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