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

⚠ Non-Billable ICD-10-CM 2026
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The ICD-10-CM code for Patient's noncompliance with medical treatment and regimen is Z91.1 (FY2026). It is a non-billable category code — select a more specific code below for claims.

Classification

Section
Z77-Z99: Persons with potential health hazards related to family and personal history and certain conditions influencing health status (Z77-Z99)
Category Z91
87 codes (62 billable)
FY2026 Status
Stable since FY2024
Excludes2
Not included here. These conditions are coded elsewhere but may be coded together if applicable.
  • 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)

Official Coding Guidelines

Unlabeled Z code list + cross-reference to I.B.14

Z76.3 Healthy person accompanying sick person Z76.4 Other boarder to healthcare facility Z76.5 Malingerer [conscious simulation] Z91.1- Patient’s noncompliance with medical treatment and regimen Z91.A- Caregiver’s noncompliance with patient’s medical treatment and regimen Z91.B Personal risk factor of exposure to diethylstilbestrol Z91.83 Wandering in diseases classified elsewhere Z91.84- Oral health risk factors Z91.89 Other specified personal risk factors, not elsewhere classified See Section I.B.14. for Z55-Z65 Persons with potential health hazards related to socioeconomic and psychosocial circumstances, documentation by clinicians other than the patient’s provider

— ICD-10-CM Official Guidelines for Coding and Reporting, FY2026
Used with any code in range A00.0-T88.9, Z00-Z99

1) Used with any code in the range of A00.0-T88.9, Z00-Z99 An external cause code may be used with any code in the range of A00.0-T88.9, Z00-Z99, classification that represents a health condition due to an external cause. Though they are most applicable to injuries, they are also valid for use with such things as infections or diseases due to an external source, and other health conditions, such as a heart attack that occurs during strenuous physical activity.

— ICD-10-CM Official Guidelines for Coding and Reporting, FY2026, Section I.C.20.a.1

Source: CMS — ICD-10-CM Official Guidelines for Coding and Reporting, FY2026

References

Related Codes

Parent Code

Z91 Personal risk factors, not elsewhere classified

More Specific Codes

Z91.11 Patient's noncompliance with dietary regimen Z91.110 Patient's noncompliance with dietary regimen due to financial hardship Z91.118 Patient's noncompliance with dietary regimen for other reason Z91.119 Patient's noncompliance with dietary regimen due to unspecified reason Z91.12 Patient's intentional underdosing of medication regimen Z91.120 Patient's intentional underdosing of medication regimen due to financial hardship Z91.128 Patient's intentional underdosing of medication regimen for other reason Z91.13 Patient's unintentional underdosing of medication regimen Z91.130 Patient's unintentional underdosing of medication regimen due to age-related debility Z91.138 Patient's unintentional underdosing of medication regimen for other reason Z91.14 Patient's other noncompliance with medication regimen Z91.141 Patient's other noncompliance with medication regimen due to financial hardship Z91.148 Patient's other noncompliance with medication regimen for other reason Z91.15 Patient's noncompliance with renal dialysis Z91.151 Patient's noncompliance with renal dialysis due to financial hardship Z91.158 Patient's noncompliance with renal dialysis for other reason Z91.19 Patient's noncompliance with other medical treatment and regimen Z91.190 Patient's noncompliance with other medical treatment and regimen due to financial hardship Z91.198 Patient's noncompliance with other medical treatment and regimen for other reason Z91.199 Patient's noncompliance with other medical treatment and regimen due to unspecified reason

Related Codes in Z91

Z91 Personal risk factors, not elsewhere classified Z91.0 Allergy status, other than to drugs and biological substances Z91.01 Food allergy status Z91.010 Allergy to peanuts Z91.011 Allergy to milk products Z91.0110 Allergy to milk products, unspecified Z91.0111 Allergy to milk products with tolerance to baked milk Z91.0112 Allergy to milk products with reactivity to baked milk Z91.012 Allergy to eggs Z91.0120 Allergy to eggs, unspecified Z91.0121 Allergy to eggs with tolerance to baked egg Z91.0122 Allergy to eggs with reactivity to baked egg Z91.013 Allergy to seafood Z91.014 Allergy to mammalian meats Z91.018 Allergy to other foods Z91.02 Food additives allergy status Z91.03 Insect allergy status Z91.030 Bee allergy status Z91.038 Other insect allergy status Z91.04 Nonmedicinal substance allergy status
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Reviewed by Prajwal Shrestha, CPC, CRC
Certified Professional Coder (CPC) and Certified Risk Adjustment Coder (CRC) · AAPC Member ID 01997614 · About · Editorial policy · Content last reviewed: 2025-10-01

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