S90.421Header code — not billable
Blister (nonthermal), right great toe
- Chapter
- 19. Injury, poisoning and certain other consequences of external causes
- Category
- S90
- Effective date
- October 1, 2026
Related codes in category S90
S90Superficial injury of ankle, foot and toesS90.0Contusion of ankleS90.00Contusion of unspecified ankleS90.00XAContusion of unspecified ankle, initial encounterYesS90.00XDContusion of unspecified ankle, subsequent encounterYesS90.00XSContusion of unspecified ankle, sequelaYesS90.01Contusion of right ankleS90.01XAContusion of right ankle, initial encounterYesS90.01XDContusion of right ankle, subsequent encounterYesS90.01XSContusion of right ankle, sequelaYesS90.02Contusion of left ankleS90.02XAContusion of left ankle, initial encounterYes
Frequently asked questions
What is ICD-10 code S90.421?
S90.421 is an ICD-10-CM diagnosis code for Blister (nonthermal), right great toe.
Is S90.421 a billable code?
No. S90.421 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 S90.421 in?
S90.421 falls under Chapter 19: Injury, poisoning and certain other consequences of external causes.
When did S90.421 become effective?
S90.421 has been effective since October 1, 2026, per the CMS/CDC ICD-10-CM annual release.
What other codes are related to S90.421?
S90.421 belongs to category S90, 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.