T50.A26Header code — not billable
Underdosing of mixed bacterial vaccines without a pertussis component
Short description: Underdosing of mixed bacterial vaccines w/o a pertuss
- Chapter
- 19. Injury, poisoning and certain other consequences of external causes
- Category
- T50
- Effective date
- October 1, 2026
Related codes in category T50
T50Diuretics and oth and unsp drug/meds/biol substT50.0Mineralocorticoids and their antagonistsT50.0XMineralocorticoids and their antagonistsT50.0X1Poisoning by mineralocorticoids and their antag, accidentalT50.0X1APoisoning by mineralocorticoids and their antag, acc, initYesT50.0X1DPoisoning by mineralocorticoids and their antag, acc, subsYesT50.0X1SPoisoning by mineralocorticoids and antag, acc, sequelaYesT50.0X2Poisoning by mineralocorticoids and their antag, self-harmT50.0X2APoisoning by mineralocorticoids and antag, self-harm, initYesT50.0X2DPoisoning by mineralocorticoids and antag, self-harm, subsYesT50.0X2SPoisn by mineralocorticoids and antag, self-harm, sequelaYesT50.0X3Poisoning by mineralocorticoids and their antag, assault
Frequently asked questions
What is ICD-10 code T50.A26?
T50.A26 is an ICD-10-CM diagnosis code for Underdosing of mixed bacterial vaccines without a pertussis component.
Is T50.A26 a billable code?
No. T50.A26 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 T50.A26 in?
T50.A26 falls under Chapter 19: Injury, poisoning and certain other consequences of external causes.
When did T50.A26 become effective?
T50.A26 has been effective since October 1, 2026, per the CMS/CDC ICD-10-CM annual release.
What other codes are related to T50.A26?
T50.A26 belongs to category T50, 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.