Z91.128 - Patient's intentional underdosing of medication regimen for other reason
ICD-10-CM Chapter 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 (Z77-Z99) · Subcategory of Z91.12 · FY2027
Includes, Excludes and Coding Notes
Sequence the underlying condition before this code.
- underdosing of medication (T36-T50) with fifth or sixth character 6
Not part of this code; report both codes when the patient has both conditions.
- caregiver noncompliance with patient's medical treatment and regimen (Z91.A-)
Report an additional code when both conditions apply.
- , if applicable, to identify underdosing of specific drug (T36-T50 with final character 6)
Not part of this code; report both codes when the patient has both conditions.
- 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-)
Report an additional code when both conditions apply.
- any follow-up examination (Z08-Z09)
Instructional notes from the ICD-10-CM tabular list.
- 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.
Related condition guides
Documentation requirements, coding pitfalls and FAQs for conditions coded with Z91.128.
Codes at the same level as Z91.128