T43.21Header code — not billable

Poisoning by, adverse effect of and underdosing of selective serotonin and norepinephrine reuptake inhibitors

Short description: Selective serotonin and norepinephrine reuptake inhibitors

Chapter
19. Injury, poisoning and certain other consequences of external causes
Category
T43
Effective date
October 1, 2026

Related codes in category T43

T43Psychotropic drugs, not elsewhere classifiedT43.0Tricyclic and tetracyclic antidepressantsT43.01Tricyclic antidepressantsT43.011Poisoning by tricyclic antidepressants, accidentalT43.011APoisoning by tricyclic antidepressants, accidental, initYesT43.011DPoisoning by tricyclic antidepressants, accidental, subsYesT43.011SPoisoning by tricyclic antidepressants, accidental, sequelaYesT43.012Poisoning by tricyclic antidepressants, self-harmT43.012APoisoning by tricyclic antidepressants, self-harm, initYesT43.012DPoisoning by tricyclic antidepressants, self-harm, subsYesT43.012SPoisoning by tricyclic antidepressants, self-harm, sequelaYesT43.013Poisoning by tricyclic antidepressants, assault

Frequently asked questions

What is ICD-10 code T43.21?

T43.21 is an ICD-10-CM diagnosis code for Poisoning by, adverse effect of and underdosing of selective serotonin and norepinephrine reuptake inhibitors.

Is T43.21 a billable code?

No. T43.21 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 T43.21 in?

T43.21 falls under Chapter 19: Injury, poisoning and certain other consequences of external causes.

When did T43.21 become effective?

T43.21 has been effective since October 1, 2026, per the CMS/CDC ICD-10-CM annual release.

What other codes are related to T43.21?

T43.21 belongs to category T43, 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.