Z91.0Allergy status, other than to drugs and biological substances

Z91.0 is the ICD-10-CM diagnosis code for allergy status, other than to drugs and biological substances. It belongs to category Z91 (personal risk factors, not elsewhere classified), 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 5 subcodes must be used instead.

Within Z91, choose Z91.0 (Allergy status, other than to drugs and biological substances) only when documentation doesn't support a more specific option: patient's noncompliance with medical treatment and regimen (Z91.1), personal history of psychological trauma, not elsewhere classified (Z91.4), personal history of self-harm (Z91.5), other specified personal risk factors, not elsewhere classified (Z91.8), Caregiver's noncompliance with patient's medical treatment and regimen (Z91.A) and personal risk factor of exposure to diethylstilbestrol (Z91.B).

To report this condition, pick the subcode that matches the documentation: Z91.01 (status), Z91.02 (status), Z91.03 (status), Z91.04 (status) and Z91.09 (substances).

The conditions in its Excludes2 note aren't part of Z91.0, but may be coded alongside it if the patient has both: Allergy status to drugs, medicaments, and biological substances (Z88.-).

It has been part of ICD-10-CM since the code set took effect on October 1, 2015 and hasn't changed since.