Z91.A2Caregiver's intentional underdosing of patient's medication regimen

Z91.A2 is the ICD-10-CM diagnosis code for Caregiver's intentional underdosing of patient's medication 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 2 subcodes must be used instead.

Within Z91.A (Caregiver's noncompliance with patient's medical treatment and regimen), Z91.A2 is specifically for Caregiver's intentional underdosing of patient's medication regimen. Related codes cover noncompliance with patient's dietary regimen (Z91.A1), unintentional underdosing of patient's medication regimen (Z91.A3), other noncompliance with patient's medication regimen (Z91.A4), noncompliance with patient's renal dialysis (Z91.A5) and noncompliance with patient's other medical treatment and regimen (Z91.A9).

To report this condition, pick the subcode that matches the documentation: Z91.A20 (due to financial hardship) and Z91.A28 (reason).

Code first: underdosing of medication (T36-T50) with fifth or sixth character 6.

It was added in FY2023, effective October 1, 2022.