T38.811 vs T38.816

T38.811 (Poisoning by anterior pituitary [adenohypophyseal] hormones, accidental (unintentional)) compared with T38.816 (Underdosing of anterior pituitary [adenohypophyseal] hormones), from the official CMS tabular data. T38.811 and T38.816 code the same substance (ACTH) with a different intent.

Relationship

Informational

Drug table relationship

T38.811

Poisoning by anterior pituitary [adenohypophyseal] hormones, accidental (unintentional)

↔

T38.816

Underdosing of anterior pituitary [adenohypophyseal] hormones

Same substance, different circumstance of exposure.

Same substance — underdosing (ACTH)

Accidental poisoning, intentional self-harm, assault, undetermined intent, adverse effect and underdosing are mutually exclusive columns — exactly one applies to a given encounter.

Source: CMS Table of Drugs and Chemicals

Can these codes be reported together?

Same substance, different intent. T38.811 and T38.816 code the same substance (ACTH) with a different circumstance of exposure.

From the CMS Table of Drugs and Chemicals: accidental poisoning, intentional self-harm, assault, undetermined intent, adverse effect and underdosing are mutually exclusive columns — only one of them applies to a given encounter.

Side by side

	T38.811Poisoning by anterior pituitary [adenohypophyseal] hormones, accidental (unintentional)	T38.816Underdosing of anterior pituitary [adenohypophyseal] hormones
Billing status	Non-billable header Report instead: T38.811A, T38.811D, T38.811S	Non-billable header Report instead: T38.816A, T38.816D, T38.816S
Classification	S00-T88 — Injury, Poisoning and Certain Other Consequences of External Causes (S00-T88)	S00-T88 — Injury, Poisoning and Certain Other Consequences of External Causes (S00-T88)
Definition	Poisoning by anterior pituitary [adenohypophyseal] hormones, accidental (unintentional) is a non-billable ICD-10-CM category code (T38.811).	Underdosing of anterior pituitary [adenohypophyseal] hormones is a non-billable ICD-10-CM category code (T38.816).
7th character	The appropriate 7th character is to be added to each code from category T38	The appropriate 7th character is to be added to each code from category T38
Includes	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	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
Use additional code	code(s) to specify: manifestations of poisoning underdosing or failure in dosage during medical and surgical care (Y63.6, Y63.8-Y63.9)	code(s) to specify: manifestations of poisoning underdosing or failure in dosage during medical and surgical care (Y63.6, Y63.8-Y63.9)
Code first	, for adverse effects, the nature of the adverse effect, such as: adverse effect NOS (T88.7)	, for adverse effects, the nature of the adverse effect, such as: adverse effect NOS (T88.7)

Edit this comparison Check a whole claim

Derived from the official CMS ICD-10-CM tabular data (FY2026). Not billing advice; verify sequencing rules for the encounter. All data sources