FY2025
Effective from
- Code-level rules changed
Patient's intentional underdosing of medication regimen
Category — select a more specific code
CDC/NCHS · FY2025caregiver noncompliance with patient's medical treatment and regimen (Z91.A-)
For US diagnosis claims covered by HIPAA, ICD-10-CM is required from October 1, 2015.
Use the service date for outpatient/professional claims and the discharge date for hospital inpatient claims. Earlier encounters use ICD-9-CM; each individual code must also be valid for the applicable date.
Official coding guidelines → · CMS ↗First observed · 2015-10-01
Latest recorded change · FY2025
Effective from
Patient's intentional underdosing of medication regimen
Category — select a more specific code
CDC/NCHS · FY2025| All editions | Effective from | Code history |
|---|---|---|
| FY2016 | 2015-10-01 | First observed |
| FY2017 | 2016-10-01 | No tabular change |
| FY2018 | 2017-10-01 | Inherited rules changed |
| FY2019 | 2018-10-01 | No tabular change |
| FY2020 | 2019-10-01 | No tabular change |
| FY2020 · April | 2020-04-01 | No tabular change |
| FY2021 | 2020-10-01 | No tabular change |
| FY2021 · 01-01 | 2021-01-01 | No tabular change |
| FY2022 | 2021-10-01 | No tabular change |
| FY2022 · 04-01 | 2022-04-01 | No tabular change |
| FY2023 | 2022-10-01 | Inherited rules changed |
| FY2023 · 04-01 | 2023-04-01 | Inherited rules changed |
| FY2024 | 2023-10-01 | No tabular change |
| FY2024 · 04-01 | 2024-04-01 | No tabular change |
| FY2025 | 2024-10-01 | Code-level rules changed |
| FY2025 · 04-01 | 2025-04-01 | No tabular change |
| FY2026 | 2025-10-01 | No tabular change |
| FY2026 · April | 2026-04-01 | No tabular change |
| FY2027 | 2026-10-01 | No tabular change |
caregiver noncompliance with patient's medical treatment and regimen (Z91.A-)
Other entries in the same category; these are not automatic substitutes.
| Code | Description | Category · further specificity required |
|---|---|---|
| Z91.11 | Patient's noncompliance with dietary regimen | Category · further specificity required |
| Z91.13 | Patient's unintentional underdosing of medication regimen | Category · further specificity required |
| Z91.14 | Patient's other noncompliance with medication regimen | Category · further specificity required |
| Z91.15 | Patient's noncompliance with renal dialysis | Category · further specificity required |
| Z91.19 | Patient's noncompliance with other medical treatment and regimen | Category · further specificity required |
Official titles and instructions are preserved in their source language. Official sources ↗
Use additional code · underdosing of medication regimen (Z91.12-, Z91.13-)