Z91.1 – Patient's noncompliance with medical treatment and regimen

ICD-10-CM 2027 diagnosis code · Persons with potential health hazards related to family and personal history and certain conditions influencing health status

Non-billable header

ICD-10-CM code Z91.1

Code: Z91.1 (claims format: Z911)
Description: Patient's noncompliance with medical treatment and regimen
Billable: No – use a more specific code below
Valid for: Dates of service October 1, 2026 – September 30, 2027 (FY2027)
Chapter: 21. Factors influencing health status and contact with health services (Z00-Z99)
Block: Z77-Z99 Persons with potential health hazards related to family and personal history and certain conditions influencing health status
Parent codes: Z91

Billable codes under Z91.1

Z91.1 is a header code and cannot be used on claims. Choose the most specific code:

Z91.11 – Patient's noncompliance with dietary regimenHeader (more codes below)
Z91.12 – Patient's intentional underdosing of medication regimenHeader (more codes below)
Z91.13 – Patient's unintentional underdosing of medication regimenHeader (more codes below)
Z91.14 – Patient's other noncompliance with medication regimenHeader (more codes below)
Z91.15 – Patient's noncompliance with renal dialysisHeader (more codes below)
Z91.19 – Patient's noncompliance with other medical treatment and regimenHeader (more codes below)

Notes for Z91.1

Excludes2 (not included here):

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)

Notes inherited from parent codes

Instructional notes at a category or block level apply to every code below it.

Z91 – Personal risk factors, not elsewhere classified

Excludes2 (not included here):

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-)

Block Z77-Z99

Code also:

any follow-up examination (Z08-Z09)

Related codes in Z91

Frequently asked questions

What is ICD-10 code Z91.1?

Z91.1 is the ICD-10-CM code for patient's noncompliance with medical treatment and regimen, in the block Z77-Z99 (Persons with potential health hazards related to family and personal history and certain conditions influencing health status).

Is Z91.1 a billable code?

No. Z91.1 is a header code with more specific child codes; report one of the billable codes listed above.

What category does Z91.1 belong to?

It belongs to category Z91 – Personal risk factors, not elsewhere classified.

Source: CDC/NCHS ICD-10-CM FY2027 code files, tabular list and index. Reference only – code assignment must follow the official ICD-10-CM guidelines and documentation in the medical record.