Z91.1

Patient's noncompliance with medical treatment and regimen

FY2027Chapter 21: Factors influencing health status and contact with health services/Z77–Z99 Persons with potential health hazards related to family and personal history and certain conditions influencing health status

Non-billable headerNot valid on its own. Use one of the more specific codes under it.

Code also
Excludes2

Z91.1 is a non-billable ICD-10-CM code header for patient's noncompliance with medical treatment and regimen. Report a more specific code from it instead. It is part of the FY2027 code set, effective October 1, 2026. The more specific codes under it are Z91.11 Patient's noncompliance with dietary regimen, Z91.12 Patient's intentional underdosing of medication regimen, Z91.13 Patient's unintentional underdosing of medication regimen, Z91.14 Patient's other noncompliance with medication regimen and 2 more. Its coding notes include a Code also instruction and 6 Excludes2 entries.

Code also

Two codes may be needed to describe the condition. This note gives no sequencing order.

This code

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

Also from chapter/block level (1 note)

Inherited from Z77–Z99 Persons with potential health hazards related to family and personal history and certain conditions influencing health status

any follow-up examination (Z08-Z09)

Excludes2

Not included here. Both codes may be reported if the patient has both conditions.

This code

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

Inherited from Z91 Personal risk factors, not elsewhere classified

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-)

Notes

Also from chapter/block level (3 notes)

Inherited from Chapter 21 Factors influencing health status and contact with health services

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.

More specific codes under Z91.1 6