Z91.199 Patient's noncompliance with other medical treatment and regimen due to unspecified reason

Billable ICD-10-CM code, FY2026. Exempt from present-on-admission (POA) reporting.

Applies from 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-)

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

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)

Applies from Z91.19 Patient's noncompliance with other medical treatment and regimen

Applicable to

• Patient's nonadherence to medical treatment

MS-DRG index

Defines the logic of DRG(s) 951 in MDC 23.

Medicare Code Edits (MCE v43.1 (April 2026))

• Unacceptable principal diagnosis: These codes describe a circumstance which influences care but is not a current illness or injury, or capture only an underlying condition, and are unacceptable as principal diagnosis.

Diagnosis Index entries for Z91.199

• Nonadherence to medical treatment, specified NEC
• Noncompliance
• Noncompliance › with › medical treatment, specified NEC

Nearby codes

• 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 (this code)
• Z91.A Caregiver's noncompliance with patient's medical treatment and regimen
• Z91.A1 Caregiver's noncompliance with patient's dietary regimen
• Z91.A10 Caregiver's noncompliance with patient's dietary regimen due to financial hardship
• Z91.A18 Caregiver's noncompliance with patient's dietary regimen for other reason
• Z91.A2 Caregiver's intentional underdosing of patient's medication regimen