T38.99Header code — not billable
Poisoning by, adverse effect of and underdosing of other hormone antagonists
Short description: Hormone antagonists
- Chapter
- 19. Injury, poisoning and certain other consequences of external causes
- Category
- T38
- Effective date
- October 1, 2026
Related codes in category T38
T38Hormones and their synthetic substitutes and antag, NECT38.0Glucocorticoids and synthetic analoguesT38.0XGlucocorticoids and synthetic analoguesT38.0X1Poisoning by glucocort/synth analog, accidentalT38.0X1APoisoning by glucocort/synth analog, accidental, initYesT38.0X1DPoisoning by glucocort/synth analog, accidental, subsYesT38.0X1SPoisoning by glucocort/synth analog, accidental, sequelaYesT38.0X2Poisoning by glucocort/synth analog, intentional self-harmT38.0X2APoisoning by glucocort/synth analog, self-harm, initYesT38.0X2DPoisoning by glucocort/synth analog, self-harm, subsYesT38.0X2SPoisoning by glucocort/synth analog, self-harm, sequelaYesT38.0X3Poisoning by glucocort/synth analog, assault
Frequently asked questions
What is ICD-10 code T38.99?
T38.99 is an ICD-10-CM diagnosis code for Poisoning by, adverse effect of and underdosing of other hormone antagonists.
Is T38.99 a billable code?
No. T38.99 is a category/header code, not billable on its own — use one of its more specific child codes instead.
What ICD-10-CM chapter is T38.99 in?
T38.99 falls under Chapter 19: Injury, poisoning and certain other consequences of external causes.
When did T38.99 become effective?
T38.99 has been effective since October 1, 2026, per the CMS/CDC ICD-10-CM annual release.
What other codes are related to T38.99?
T38.99 belongs to category T38, which includes 12 other codes — see the related codes list on this page.
ICD-10-CM data maintained by CDC/CMS (public domain). Always verify codes with authoritative sources before making coding or billing decisions.