FY2025 · 04-01
Effective from
- Inherited rules changed
Poisoning by other synthetic narcotics, accidental (unintentional)
Category — select a more specific code
CDC/NCHS · FY2025 · 04-01code to identify any retained foreign body, if applicable (Z18.-)
toxic reaction to local anesthesia in pregnancy (O29.3-)
A — initial encounter
D — subsequent encounter
S — sequela
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 · 2020-10-01
Latest recorded change · FY2025 · 04-01
Effective from
Poisoning by other synthetic narcotics, accidental (unintentional)
Category — select a more specific code
CDC/NCHS · FY2025 · 04-01| All editions | Effective from | Code history |
|---|---|---|
| FY2021 | 2020-10-01 | Added |
| 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 | No tabular change |
| FY2023 · 04-01 | 2023-04-01 | No tabular change |
| FY2024 | 2023-10-01 | No tabular change |
| FY2024 · 04-01 | 2024-04-01 | No tabular change |
| FY2025 | 2024-10-01 | No tabular change |
| FY2025 · 04-01 | 2025-04-01 | Inherited rules changed |
| FY2026 | 2025-10-01 | No tabular change |
| FY2026 · April | 2026-04-01 | No tabular change |
| FY2027 | 2026-10-01 | No tabular change |
Poisoning by other synthetic narcotics NOS
code to identify any retained foreign body, if applicable (Z18.-)
toxic reaction to local anesthesia in pregnancy (O29.3-)
drug dependence and related mental and behavioral disorders due to psychoactive substance use (F10.-F19.-)
The appropriate 7th character is to be added to each code from category T40
A — initial encounter
D — subsequent encounter
S — sequela
T40.491APoisoning by other synthetic narcotics, accidental (unintentional), initial encounterBillable / specificT40.491DPoisoning by other synthetic narcotics, accidental (unintentional), subsequent encounterBillable / specificT40.491SPoisoning by other synthetic narcotics, accidental (unintentional), sequelaBillable / specificOther entries in the same category; these are not automatic substitutes.
| Code | Description | Category · further specificity required |
|---|---|---|
| T40.492 | Poisoning by other synthetic narcotics, intentional self-harm | Category · further specificity required |
| T40.493 | Poisoning by other synthetic narcotics, assault | Category · further specificity required |
| T40.494 | Poisoning by other synthetic narcotics, undetermined | Category · further specificity required |
| T40.495 | Adverse effect of other synthetic narcotics | Category · further specificity required |
| T40.496 | Underdosing of other synthetic narcotics | Category · further specificity required |
Official titles and instructions are preserved in their source language. Official sources ↗