Z91.A2 — Caregiver's intentional underdosing of patient's medication regimen
Is Z91.A2 billable?
No — Z91.A2 is a non-billable header code. Z91.A2 groups more specific codes and cannot be submitted on a claim. A valid ICD-10-CM code must be reported at the highest level of specificity available in its branch. Select one of the 2 billable codes beneath Z91.A2.
Z91.A2 at a glance
| Code | Z91.A2 |
|---|---|
| Description | Caregiver's intentional underdosing of patient's medication regimen |
| Billable | No — header code |
| Code set | ICD-10-CM FY2027 |
| Valid for encounters | October 1, 2026 – September 30, 2027 |
Code first
The underlying condition below must be sequenced before Z91.A2. Z91.A2 describes a manifestation and cannot be the principal or first-listed diagnosis.
- underdosing of medication (T36-T50) with fifth or sixth character 6
Excludes2 — not included here — inherited from Z91
The conditions below are not part of Z91.A2, but a patient may have both at the same time. When documentation supports it, Z91.A2 and the excluded code may both be reported.
Code also — inherited from Z77-Z99
Two codes may be needed to describe the condition fully. Whether Z91.A2 is sequenced first depends on the reason for the encounter.
- any follow-up examination (Z08-Z09)
What codes fall under Z91.A2? (2)
How long has Z91.A2 existed?
Z91.A2 first appears in FY2023.
Derived from the official order files for FY2016–FY2026. FY2017 and FY2020 publish no order file, so those years are not covered.
What other codes are in the Z91.A family? (5)
- Z91.A1Caregiver's noncompliance with patient's dietary regimennot billable
- Z91.A3Caregiver's unintentional underdosing of patient's medication regimen
- Z91.A4Caregiver's other noncompliance with patient's medication regimennot billable
- Z91.A5Caregiver's noncompliance with patient's renal dialysisnot billable
- Z91.A9Caregiver's noncompliance with patient's other medical treatment and regimennot billable