T40.601A — Poisoning by unspecified narcotics, accidental (unintentional), initial encounter
Is T40.601A billable?
Yes, but T40.601A is an unspecified code. T40.601A is a valid, billable ICD-10-CM code for encounters from October 1, 2026 through September 30, 2027. However, T40.601A is an unspecified or catch-all code. Payers apply additional scrutiny to unspecified codes and many deny them when the medical record supports a more specific option, so check the documentation before selecting T40.601A — the more specific alternatives are listed below.
More specific alternatives
- T40.0X1APoisoning by opium, accidental (unintentional), initial encounter
- T40.1X1APoisoning by heroin, accidental (unintentional), initial encounter
- T40.2X1APoisoning by other opioids, accidental (unintentional), initial encounter
- T40.3X1APoisoning by methadone, accidental (unintentional), initial encounter
- T40.411APoisoning by fentanyl or fentanyl analogs, accidental (unintentional), initial encounter
- T40.5X1APoisoning by cocaine, accidental (unintentional), initial encounter
- T40.711APoisoning by cannabis, accidental (unintentional), initial encounter
- T40.8X1APoisoning by lysergide [LSD], accidental (unintentional), initial encounter
T40.601A at a glance
| Code | T40.601A |
|---|---|
| Description | Poisoning by unspecified narcotics, accidental (unintentional), initial encounter |
| Billable | Yes |
| Code set | ICD-10-CM FY2027 |
| Valid for encounters | October 1, 2026 – September 30, 2027 |
| 7th character "A" | initial encounter |
What does the 7th character "A" mean in T40.601A?
In T40.601A, the 7th character A means initial encounter. The 7th character is required for T40.601A to be a valid, complete code.
Same condition, different episode of care — switch the 7th character:
Which MS-DRGs does T40.601A group to?
T40.601A sits in MDC 21 and helps define the logic of 2 MS-DRGs (version 44, FY2027). Which one a stay actually groups to also depends on procedures and secondary diagnoses.
- 917Poisoning and Toxic Effects of Drugs with MCCmedical
- 918Poisoning and Toxic Effects of Drugs without MCCmedical
Inclusion terms
Alternative wording in documentation that is classified to T40.601A.
- Poisoning by narcotics NOS
Excludes1 — never code together — inherited from T36-T50
The conditions below can never be reported together with T40.601A on the same claim. An Excludes1 note means the two conditions cannot occur in the same patient, so reporting both is a coding error.
- toxic reaction to local anesthesia in pregnancy (O29.3-)
Code first — inherited from T36-T50
The underlying condition below must be sequenced before T40.601A. T40.601A describes a manifestation and cannot be the principal or first-listed diagnosis.
Use additional code — inherited from Chapter 19
Report an additional code alongside T40.601A to fully describe the condition. T40.601A is sequenced first.
- code to identify any retained foreign body, if applicable (Z18.-)
Use additional code — inherited from T36-T50
Report an additional code alongside T40.601A to fully describe the condition. T40.601A is sequenced first.
Excludes2 — not included here — inherited from Chapter 19
The conditions below are not part of T40.601A, but a patient may have both at the same time. When documentation supports it, T40.601A and the excluded code may both be reported.
Excludes2 — not included here — inherited from T36-T50
The conditions below are not part of T40.601A, but a patient may have both at the same time. When documentation supports it, T40.601A and the excluded code may both be reported.
Excludes2 — not included here — inherited from T40
The conditions below are not part of T40.601A, but a patient may have both at the same time. When documentation supports it, T40.601A and the excluded code may both be reported.
- drug dependence and related mental and behavioral disorders due to psychoactive substance use (F10.-F19.-)
How long has T40.601A existed?
T40.601A has been in ICD-10-CM since at least FY2016, the earliest fiscal year on record here.
Derived from the official order files for FY2016–FY2026. FY2017 and FY2020 publish no order file, so those years are not covered.