Z91.0UpcomingCategory · further specificity required

Allergy status, other than to drugs and biological substances

Z77-Z99 · Inherited instructions

Code also

any follow-up examination (Z08-Z09)

Excludes 2 · 6

Z91.0

Excludes 2

Allergy status to drugs, medicaments, and biological substances (Z88.-)

Z91 · Personal risk factors, not elsewhere classified

Excludes 2

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-)

More specific codes

Z91.01Food allergy status Z91.02Food additives allergy status Z91.03Insect allergy status Z91.04Nonmedicinal substance allergy status Z91.09Other allergy status, other than to drugs and biological substances

Claims & coverage

When ICD-10-CM is required

For US diagnosis claims covered by HIPAA, ICD-10-CM is required from October 1, 2015.

Use the service date for outpatient/professional claims and the discharge date for hospital inpatient claims. Earlier encounters use ICD-9-CM; each individual code must also be valid for the applicable date.

Official coding guidelines → · CMS ↗

First observed · 2015-10-01

Code history

Latest recorded change · FY2023

ChangedUnchanged

FY2023

Effective from 2022-10-01

Inherited rules changed

Allergy status, other than to drugs and biological substances

Category — select a more specific code

CDC/NCHS · FY2023

All editions (19)

All editions	Effective from	Code history
FY2016	2015-10-01	First observed
FY2017	2016-10-01	No tabular change
FY2018	2017-10-01	Inherited rules changed
FY2019	2018-10-01	No tabular change
FY2020	2019-10-01	No tabular change
FY2020 · April	2020-04-01	No tabular change
FY2021	2020-10-01	No tabular change
FY2021 · 01-01	2021-01-01	No tabular change
FY2022	2021-10-01	No tabular change
FY2022 · 04-01	2022-04-01	No tabular change
FY2023	2022-10-01	Inherited rules changed
FY2023 · 04-01	2023-04-01	No tabular change
FY2024	2023-10-01	No tabular change
FY2024 · 04-01	2024-04-01	No tabular change
FY2025	2024-10-01	No tabular change
FY2025 · 04-01	2025-04-01	No tabular change
FY2026	2025-10-01	No tabular change
FY2026 · April	2026-04-01	No tabular change
FY2027	2026-10-01	No tabular change

Code-level instructions

Excludes 2

Allergy status to drugs, medicaments, and biological substances (Z88.-)

Inherited instructions

Chapters 21 · Factors influencing health status and contact with health services (Z00-Z99)

Note

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.

Z77-Z99 · Persons with potential health hazards related to family and personal history and certain conditions influencing health status (Z77-Z99)

Code also

any follow-up examination (Z08-Z09)

Z91 · Personal risk factors, not elsewhere classified

Excludes 2

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-)

More specific codes

Z91.01Food allergy statusCategory · further specificity required Z91.02Food additives allergy statusBillable / specific Z91.03Insect allergy statusCategory · further specificity required Z91.04Nonmedicinal substance allergy statusCategory · further specificity required Z91.09Other allergy status, other than to drugs and biological substancesBillable / specific

Related codes

Other entries in the same category; these are not automatic substitutes.

Code	Description	Category · further specificity required
Z91.1	Patient's noncompliance with medical treatment and regimen	Category · further specificity required
Z91.4	Personal history of psychological trauma, not elsewhere classified	Category · further specificity required
Z91.5	Personal history of self-harm	Category · further specificity required
Z91.8	Other specified personal risk factors, not elsewhere classified	Category · further specificity required
Z91.A	Caregiver's noncompliance with patient's medical treatment and regimen	Category · further specificity required
Z91.B	Personal risk factor of exposure to diethylstilbestrol	Billable / specific

Official titles and instructions are preserved in their source language. Official sources ↗

References from other codes (3)

D89.44 · Hereditary alpha tryptasemia

Use additional code · allergy status, other than to drugs and biological substances (Z91.0-)

Z87.892 · Personal history of anaphylaxis

Code also · allergy status, other than to drugs and biological substances (Z91.0-)

Z88 · Allergy status to drugs, medicaments and biological substances

Excludes 2 · Allergy status, other than to drugs and biological substances (Z91.0-)

Z91.0UpcomingCategory · further specificity required

Allergy status, other than to drugs and biological substances

Z77-Z99 · Inherited instructions

Code also

any follow-up examination (Z08-Z09)

Excludes 2 · 6

Z91.0

Excludes 2

Allergy status to drugs, medicaments, and biological substances (Z88.-)

Z91 · Personal risk factors, not elsewhere classified

Excludes 2

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-)

More specific codes

Claims & coverage

When ICD-10-CM is required

For US diagnosis claims covered by HIPAA, ICD-10-CM is required from October 1, 2015.

Official coding guidelines → · CMS ↗

First observed · 2015-10-01

Code history

Latest recorded change · FY2023

ChangedUnchanged

FY2023

Effective from 2022-10-01

Inherited rules changed

Allergy status, other than to drugs and biological substances

Category — select a more specific code

CDC/NCHS · FY2023

All editions (19)

All editions	Effective from	Code history
FY2016	2015-10-01	First observed
FY2017	2016-10-01	No tabular change
FY2018	2017-10-01	Inherited rules changed
FY2019	2018-10-01	No tabular change
FY2020	2019-10-01	No tabular change
FY2020 · April	2020-04-01	No tabular change
FY2021	2020-10-01	No tabular change
FY2021 · 01-01	2021-01-01	No tabular change
FY2022	2021-10-01	No tabular change
FY2022 · 04-01	2022-04-01	No tabular change
FY2023	2022-10-01	Inherited rules changed
FY2023 · 04-01	2023-04-01	No tabular change
FY2024	2023-10-01	No tabular change
FY2024 · 04-01	2024-04-01	No tabular change
FY2025	2024-10-01	No tabular change
FY2025 · 04-01	2025-04-01	No tabular change
FY2026	2025-10-01	No tabular change
FY2026 · April	2026-04-01	No tabular change
FY2027	2026-10-01	No tabular change

Code-level instructions

Excludes 2

Allergy status to drugs, medicaments, and biological substances (Z88.-)

Inherited instructions

Chapters 21 · Factors influencing health status and contact with health services (Z00-Z99)

Note

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.

Z77-Z99 · Persons with potential health hazards related to family and personal history and certain conditions influencing health status (Z77-Z99)

Code also

any follow-up examination (Z08-Z09)

Z91 · Personal risk factors, not elsewhere classified

Excludes 2

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-)

More specific codes

Related codes

Other entries in the same category; these are not automatic substitutes.

Code	Description	Category · further specificity required
Z91.1	Patient's noncompliance with medical treatment and regimen	Category · further specificity required
Z91.4	Personal history of psychological trauma, not elsewhere classified	Category · further specificity required
Z91.5	Personal history of self-harm	Category · further specificity required
Z91.8	Other specified personal risk factors, not elsewhere classified	Category · further specificity required
Z91.A	Caregiver's noncompliance with patient's medical treatment and regimen	Category · further specificity required
Z91.B	Personal risk factor of exposure to diethylstilbestrol	Billable / specific

Official titles and instructions are preserved in their source language. Official sources ↗

References from other codes (3)

D89.44 · Hereditary alpha tryptasemia

Use additional code · allergy status, other than to drugs and biological substances (Z91.0-)

Z87.892 · Personal history of anaphylaxis

Code also · allergy status, other than to drugs and biological substances (Z91.0-)

Z88 · Allergy status to drugs, medicaments and biological substances

Excludes 2 · Allergy status, other than to drugs and biological substances (Z91.0-)