Z91.A3
Z91.A3: Caregiver's unintentional underdosing of patient's medication regimen
Billable / specific codeICD-10-CMPOA exempt
Z91.A3 is a billable, specific ICD-10-CM code for caregiver's unintentional underdosing of patient's medication regimen. It is valid for submission on a claim.
Check Z91.A3 with the rest of the claim: free scrubberCode first
The underlying condition must be sequenced before this code.
Excludes2 inherited from the categories above Z91.A3
Not part of this code, but both may be coded when both are present.
Written on Z91: Personal risk factors, not elsewhere classified
Risk adjustment
No CMS-HCC V28 category: this code does not change a RAF score.
Medicare coverage
Z91.A3 is named in 4 Medicare coverage policies: 4 listing it as supporting medical necessity. Which one applies depends on your Medicare contractor.
- A54799Billing and Coding: Urine Drug Testing
- A55001Billing and Coding: Urine Drug Testing
- A56818Billing and Coding: Urine Drug Testing
- A59416Billing and Coding: Urine Drug Testing
Alphabetic index entries that lead here
- Noncompliance›with›medication regimen NEC›underdosing›unintentional NEC›by caregiver
Code history
Unchanged in every release from FY2024 to FY2027.
Other codes under Z91.A
- Z91.A1Caregiver's noncompliance with patient's dietary regimen
- Z91.A2Caregiver's intentional underdosing of patient's medication regimen
- Z91.A4Caregiver's other noncompliance with patient's medication regimen
- Z91.A5Caregiver's noncompliance with patient's renal dialysis
- Z91.A9Caregiver's noncompliance with patient's other medical treatment and regimen