Furuncle of flank

ValidICD-10-CM diagnosis code.

Valid for claims with a date of service in the current code year.

Valid FY2026 onwards.

What has happened to this code

Every change the publisher made, from 2026 to now.

FY2026 Added to the code set Furuncle of flank

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 L02 Cutaneous abscess, furuncle and carbuncle

Excludes2 - not included here

abscess of anus and rectal regions (K61.-)
abscess of female genital organs (external) (N76.4)
abscess of male genital organs (external) (N48.2, N49.-)

Use additional code

code to identify organism (B95-B96)

Inherited from the L00-L08 section Infections of the skin and subcutaneous tissue (L00-L08)

Excludes2 - not included here

hordeolum (H00.0)
infective dermatitis (L30.3)
local infections of skin classified in Chapter 1
lupus panniculitis (L93.2)
panniculitis NOS (M79.3)
panniculitis of neck and back (M54.0-)
Perlèche NOS (K13.0)
Perlèche due to candidiasis (B37.0)
Perlèche due to riboflavin deficiency (E53.0)
pyogenic granuloma (L98.0)
relapsing panniculitis [Weber-Christian] (M35.6)
viral warts (B07.-)
zoster (B02.-)

Use additional code

code (B95-B97) to identify infectious agent.

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.

Boil
Furunculosis
Folliculitis > deep
Furuncle > flank

Codes in the same group

Code	Description	Status
L02.221	Furuncle of abdominal wall	Valid
L02.222	Furuncle of back [any part, except buttock and flank]	Valid
L02.223	Furuncle of chest wall	Valid
L02.224	Furuncle of groin	Valid
L02.225	Furuncle of perineum	Valid
L02.226	Furuncle of umbilicus	Valid
L02.229	Furuncle of trunk, unspecified	Valid