ICD-10-CM › S00-T88 › S90-S99 › S90.44 External constriction of toe › S90.446

S90.446

External constriction, unspecified lesser toe(s)

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 3 more specific codes instead:

  • S90.446A External constriction, unspecified lesser toe(s), initial encounter
  • S90.446D External constriction, unspecified lesser toe(s), subsequent encounter
  • S90.446S External constriction, unspecified lesser toe(s), sequela

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

What has happened to this code

Every change the publisher made, from 2014 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. FY2014 Added to the draft code set draft External constriction, unspecified lesser toe(s)

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
S90.441 External constriction, right great toe Not billable
S90.442 External constriction, left great toe Not billable
S90.443 External constriction, unspecified great toe Not billable
S90.444 External constriction, right lesser toe(s) Not billable
S90.445 External constriction, left lesser toe(s) Not billable