Z91.1CurrentCategory · further specificity required

Patient's noncompliance with medical treatment and regimen

Code-level instructions

Code also

, if applicable, to identify underdosing of specific drug (T36-T50 with final character 6)

Z77-Z99 · Inherited instructions

Code also

any follow-up examination (Z08-Z09)

Excludes 2 · 6

Z91.1

Excludes 2

caregiver noncompliance with patient's medical treatment and regimen (Z91.A-)

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

Z91.11Patient's noncompliance with dietary regimen Z91.12Patient's intentional underdosing of medication regimen Z91.13Patient's unintentional underdosing of medication regimen Z91.14Patient's other noncompliance with medication regimen Z91.15Patient's noncompliance with renal dialysis Z91.19Patient's noncompliance with other medical treatment and regimen

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 · 04-01

ChangedUnchanged

FY2023 · 04-01

Effective from 2023-04-01

Code-level rules changed

Patient's noncompliance with medical treatment and regimen

Category — select a more specific code

CDC/NCHS · FY2023 · 04-01

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	Code-level rules changed · Inherited rules changed
FY2023 · 04-01	2023-04-01	Code-level rules changed
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

caregiver noncompliance with patient's medical treatment and regimen (Z91.A-)

Code also

, if applicable, to identify underdosing of specific drug (T36-T50 with final character 6)

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

Z91.11Patient's noncompliance with dietary regimenCategory · further specificity required Z91.12Patient's intentional underdosing of medication regimenCategory · further specificity required Z91.13Patient's unintentional underdosing of medication regimenCategory · further specificity required Z91.14Patient's other noncompliance with medication regimenCategory · further specificity required Z91.15Patient's noncompliance with renal dialysisCategory · further specificity required Z91.19Patient's noncompliance with other medical treatment and regimenCategory · further specificity required

Related codes

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

Code	Description	Category · further specificity required
Z91.0	Allergy status, other than to drugs and biological substances	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 ↗

Z91.1CurrentCategory · further specificity required

Patient's noncompliance with medical treatment and regimen

Code-level instructions

Code also

, if applicable, to identify underdosing of specific drug (T36-T50 with final character 6)

Z77-Z99 · Inherited instructions

Code also

any follow-up examination (Z08-Z09)

Excludes 2 · 6

Z91.1

Excludes 2

caregiver noncompliance with patient's medical treatment and regimen (Z91.A-)

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 · 04-01

ChangedUnchanged

FY2023 · 04-01

Effective from 2023-04-01

Code-level rules changed

Patient's noncompliance with medical treatment and regimen

Category — select a more specific code

CDC/NCHS · FY2023 · 04-01

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	Code-level rules changed · Inherited rules changed
FY2023 · 04-01	2023-04-01	Code-level rules changed
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

caregiver noncompliance with patient's medical treatment and regimen (Z91.A-)

Code also

, if applicable, to identify underdosing of specific drug (T36-T50 with final character 6)

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