ICD-10-CM 2027 diagnosis code

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

Not billable — use a more specific code

Z91.1 is a header code, so it can't be reported by itself. Choose one of the 6 more specific codes beneath it.

Code unchanged since ICD-10-CM took effect on October 1, 2015. Source: official FY2027 ICD-10-CM release from CDC/NCHS and CMS. Page updated September 29, 2026. About our data

About Z91.1

Z91.1 is the ICD-10-CM diagnosis code for patient's noncompliance with medical treatment and regimen. 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 6 subcodes must be used instead.

Within Z91 (personal risk factors, not elsewhere classified), Z91.1 is specifically for patient's noncompliance with medical treatment and regimen. Related codes cover allergy status, other than to drugs and biological substances (Z91.0), 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: Z91.11 (regimen), Z91.12 (regimen), Z91.13 (regimen), Z91.14 (regimen), Z91.15 (dialysis) and Z91.19 (regimen).

The conditions in its Excludes2 note aren't part of Z91.1, but may be coded alongside it if the patient has both: caregiver noncompliance with patient's medical treatment and regimen (Z91.A-).

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

Specific codes under Z91.1

Coding notes

Excludes2Not included here — may be reported together if both conditions exist

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

Code alsoTwo codes may be needed; sequencing depends on circumstances

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

Notes that apply from higher levels

Instructions written at a parent level also apply to Z91.1.

› From Z91 Personal risk factors, not elsewhere classified

Excludes2

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-)

Broader instructions also apply from 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.

Code history

2016
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2021
2022
2023
2024
2025
2026
2027

FY2016 (effective 10/1/2015): Added (first year of ICD-10-CM)
No changes since FY2016.

Common questions about Z91.1

Is Z91.1 billable?: No. Z91.1 is a header code. Report one of its more specific subcodes instead.