Z91.A2
Caregiver's intentional underdosing of patient's medication regimen
Z91.A2 is a non-billable ICD-10-CM code header for caregiver's intentional underdosing of patient's medication regimen. Report a more specific code from it instead. It is part of the FY2027 code set, effective October 1, 2026. The more specific codes under it are Z91.A20 Caregiver's intentional underdosing of patient's medication regimen due to financial hardship and Z91.A28 Caregiver's intentional underdosing of medication regimen for other reason. Its coding notes include a Code first instruction, a Code also instruction and 5 Excludes2 entries.
Code first
If the underlying condition listed here is present and known, sequence it first.
- underdosing of medication (T36-T50) with fifth or sixth character 6
Code also
Two codes may be needed to describe the condition. This note gives no sequencing order.
Also from chapter/block level (1 note)
- any follow-up examination (Z08-Z09)
Excludes2
Not included here. Both codes may be reported if the patient has both conditions.
Notes
Also from chapter/block level (3 notes)
- 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.