Z91.0
Allergy status, other than to drugs and biological substances
Not billable — category only FY2026 2025-10-01 → 2026-09-30
Exclusions 6 never code together
Z91code
Excludes2
- contact with and (suspected) exposures hazardous to health (Z77.-)Z77.-
- exposure to pollution and other problems related to physical environment (Z77.1-)Z77.1-
- female genital mutilation status (N90.81-)N90.81-
- occupational exposure to risk factors (Z57.-)Z57.-
- personal history of physical injury and trauma (Z87.81, Z87.82-)Z87.81Z87.82-
Excludes2 — not included here, but the patient may have both. Code both when documented.
Instructional notes 4
Z00-Z99chapter
Notes
- 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:Z00-Z99A00-Y89
- (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.
Index entries leading here filed at null
No alphabetic index entry points at this code.
Alongside this code 6 same parent — Z91
Z91.1 Patient's noncompliance with medical treatment and regimen category Z91.A Carers noncompl with patient's medical treatment and regimen category Z91.4 Personal history of psychological trauma, NEC category Z91.5 Personal history of self-harm category Z91.8 Oth personal risk factors, not elsewhere classified category Z91.B Personal risk factor of exposure to diethylstilbestrol
Subordinate codes 5
Additional references
AHA Coding Clinic® Licence required
Official coding advice for this code. Published by the American Hospital Association. Not included in this installation.