T39.2X4D Poisoning by pyrazolone derivatives, undetermined, subsequent encounter

ICD-10-CM T39.2X4D: Poisoning by pyrazolone derivatives, undetermined, subsequent encounter

ICD-10-CM code T39.2X4D identifies a subsequent encounter for poisoning by pyrazolone derivatives when the intent is undetermined. The code is active and classified under the parent concept T39.2X4. It appears in Medicare and payer drug-testing contexts, though the sources do not specify coverage criteria. 1 2 4

Plain-language overview

Code T39.2X4D describes a subsequent healthcare encounter for a patient experiencing poisoning by pyrazolone derivatives when the intent remains undetermined. 1

What this code represents

The official display label for T39.2X4D is Poisoning by pyrazolone derivatives, undetermined, subsequent encounter, and its semantic type is Injury or Poisoning. 1

T39.2X4D is an active ICD-10-CM concept that has narrower concepts and falls under the parent concept T39.2X4, Poisoning by pyrazolone derivatives, undetermined. 1

Coding details

The ICD-10-CM 2026 terminology record lists T39.2X4D as a subsequent encounter code, distinguishing it from T39.2X4A, which represents the initial encounter for the same undetermined poisoning. 1 3

An official abbreviation for T39.2X4D is Poisoning by pyrazolone derivatives, undetermined, subs., as listed in the ICD-10-CM 2026 terminology record. 1

Documentation considerations

The terminology record for T39.2X4D assigns the semantic type Injury or Poisoning and specifies the undetermined intent and subsequent encounter status that distinguish this specific diagnosis. 1

Coverage and utilization context

Code T39.2X4D appears in a Medicare billing and coding article for controlled substance monitoring and drugs of abuse testing, alongside other pyrazolone derivative codes. 2

What the sources add

Both the CMS article and a Highmark provider drug-testing policy list T39.2X4D alongside T39.2X5A, indicating the code appears in payer drug-testing contexts across different source domains. 2 4

The NCI terminology record defines T39.2X4D as an active, hierarchical ICD-10-CM concept, whereas the CMS and Highmark sources list the code within drug-testing policies without defining its structure. 1 2 4

Sources

1. ICD-10-CM T39.2X4D terminology record — National Cancer Institute Enterprise Vocabulary Services; accessed 2026-07-27.
2. Article - Billing and Coding: Controlled Substance Monitoring and Drugs of Abuse Testing (A56645) — cms.gov; accessed 2026-07-27.
3. MCD Search — cms.gov; accessed 2026-07-27.
4. Drug Testing — providers.highmark.com; accessed 2026-07-27.