ICD-10-CM › S00-T88 › S90-S99 › S90.4 Other superficial injuries of toe › S90.42

S90.42

Blister (nonthermal) of toe

Not billableICD-10-CM diagnosis code.

This code exists but cannot be submitted on its own. It groups the more specific codes beneath it.

A category header for its whole life, FY2016 onwards. It has never been valid for submission on its own.

Submit one of these 6 more specific codes instead:

  • S90.421 Blister (nonthermal), right great toe (also a header)
  • S90.422 Blister (nonthermal), left great toe (also a header)
  • S90.423 Blister (nonthermal), unspecified great toe (also a header)
  • S90.424 Blister (nonthermal), right lesser toe(s) (also a header)
  • S90.425 Blister (nonthermal), left lesser toe(s) (also a header)
  • S90.426 Blister (nonthermal), unspecified lesser toe(s) (also a header)

This code requires a seventh character. See the rule below.

What has happened to this code

Every change the publisher made, from 2012 to now. Entries marked draft are from the pre-implementation releases: ICD-10 took effect on 1 October 2015, so nothing before FY2016 was ever valid on a claim.

  1. FY2012 Added to the draft code set draft Blister (nonthermal) of toe

Official coding rules

Published by CDC for FY2027. A rule attached to a category binds every code beneath it, so the rules inherited from this code's ancestors are shown with the code they come from.

Inherited from S90 Superficial injury of ankle, foot and toes

Seventh character required

  • The appropriate 7th character is to be added to each code from category S90

Inherited from the S90-S99 section Injuries to the ankle and foot (S90-S99)

Excludes2 - not included here

  • burns and corrosions (T20-T32)
  • fracture of ankle and malleolus (S82.-)
  • frostbite (T33-T34)
  • insect bite or sting, venomous (T63.4)

How CDC's index refers to this code

Wording from the official alphabetic index. Much of it appears nowhere in the code description, which is why a search for the everyday phrase so often finds nothing.

Codes in the same group

CodeDescriptionStatus
S90.41 Abrasion of toe Not billable
S90.44 External constriction of toe Not billable
S90.45 Superficial foreign body of toe Not billable
S90.46 Insect bite (nonvenomous) of toe Not billable
S90.47 Other superficial bite of toe Not billable