T39.1X5A — Adverse effect of 4-Aminophenol derivatives, initial encounter

Billing Status: YES. This is a valid, specific, and billable ICD-10-CM reference.

Inpatient Payment Groups (MS-DRG)

MS-DRGs this diagnosis helps define, as principal or secondary, per the CMS ICD-10-CM/PCS MS-DRG Definitions Manual v43.0 (FY2026), Appendix B.

A diagnosis appearing in a group's logic does not by itself determine the DRG assigned to a stay; the grouper uses the full claim.

Adverse effect of 4-Aminophenol derivatives, initial encounter is a billable ICD-10-CM diagnosis code (T39.1X5A).

Sequencing, inclusion, and exclusion notes published for T39.1X5A in the official ICD-10-CM tabular list.

Conditions the official ICD-10-CM tabular list includes under this code.

adverse effect of correct substance properly administered
poisoning by overdose of substance
poisoning by wrong substance given or taken in error
underdosing by (inadvertently) (deliberately) taking less substance than prescribed or instructed

Conditions that can never be reported with this code; the two are mutually exclusive.

Conditions not covered by this code, but which may be reported alongside it when both are present.

abuse and dependence of psychoactive substances (F10-F19)
abuse of non-dependence-producing substances (F55.-)
immunodeficiency due to drugs (D84.821)
drug reaction and poisoning affecting newborn (P00-P96)
pathological drug intoxication (inebriation) (F10-F19)

Underlying conditions that must be sequenced before this code.

Supplementary codes the tabular list directs you to add.

Use additional code(s) to specify:
manifestations of poisoning
underdosing or failure in dosage during medical and surgical care (Y63.6, Y63.8-Y63.9)
underdosing of medication regimen (Z91.12-, Z91.13-)

Yes. The appropriate 7th character is to be added to each code from category T39.

Official ICD-10-CM classifications closest to T39.1X5A in its code family, with their registry titles.

T39.1X4 — Poisoning by 4-Aminophenol derivatives, undetermined
T39.1X4A — Poisoning by 4-Aminophenol derivatives, undetermined, initial encounter
T39.1X4D — Poisoning by 4-Aminophenol derivatives, undetermined, subsequent encounter
T39.1X4S — Poisoning by 4-Aminophenol derivatives, undetermined, sequela
T39.1X5 — Adverse effect of 4-Aminophenol derivatives
T39.1X5D — Adverse effect of 4-Aminophenol derivatives, subsequent encounter
T39.1X5S — Adverse effect of 4-Aminophenol derivatives, sequela
T39.1X6 — Underdosing of 4-Aminophenol derivatives
T39.1X6A — Underdosing of 4-Aminophenol derivatives, initial encounter
T39.1X6D — Underdosing of 4-Aminophenol derivatives, subsequent encounter

Substances from the official ICD-10-CM Table of Drugs and Chemicals that map to this code.