Alphabetic Index FY2027

L02.421

Furuncle of right axilla

FY2027Chapter 12: Diseases of the skin and subcutaneous tissue/L00–L08 Infections of the skin and subcutaneous tissue

BillableComplete code, valid to report
Care settingsHome Health Primary · Wound

L02.421 (also written L02421) is a billable ICD-10-CM diagnosis code for furuncle of right axilla. It is part of the FY2027 code set, effective October 1, 2026. It is one of the 81 codes in category L02 (Cutaneous abscess, furuncle and carbuncle). Its coding notes include a Use additional code instruction and 29 Excludes2 entries.

Use additional code

Add the listed code as a secondary code, if known.

Inherited from L02 Cutaneous abscess, furuncle and carbuncle
  • code to identify organism (B95-B96)
Also from chapter/block level (1 note)
Inherited from L00–L08 Infections of the skin and subcutaneous tissue
  • code (B95-B97) to identify infectious agent.

Excludes2

Not included here. Both codes may be reported if the patient has both conditions.

Inherited from L02.4 Cutaneous abscess, furuncle and carbuncle of limb
  • Cutaneous abscess, furuncle and carbuncle of groin (L02.214, L02.224, L02.234)
  • Cutaneous abscess, furuncle and carbuncle of hand (L02.5-)
  • Cutaneous abscess, furuncle and carbuncle of foot (L02.6-)
Inherited from L02 Cutaneous abscess, furuncle and carbuncle
  • abscess of anus and rectal regions (K61.-)
  • abscess of female genital organs (external) (N76.4)
  • abscess of male genital organs (external) (N48.2, N49.-)
Also from chapter/block level (23 notes)
Inherited from L00–L08 Infections of the skin and subcutaneous tissue
  • 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.-)
Inherited from Chapter 12 Diseases of the skin and subcutaneous tissue
  • certain conditions originating in the perinatal period (P04-P96)
  • certain infectious and parasitic diseases (A00-B99)
  • complications of pregnancy, childbirth and the puerperium (O00-O9A)
  • congenital malformations, deformations, and chromosomal abnormalities (Q00-Q99)
  • endocrine, nutritional and metabolic diseases (E00-E88)
  • lipomelanotic reticulosis (I89.8)
  • neoplasms (C00-D49)
  • symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R94)
  • systemic connective tissue disorders (M30-M36)
  • viral warts (B07.-)

Care settings

How CMS programs treat this code. These are CMS claim edits and list entries, not coverage or eligibility rules.

Home Health Primary

Accepted as the primary (principal) diagnosis on a home health claim. The Home Health Grouper assigns it to the Wound clinical group.

Source: CMS Home Health Grouper Software v07.2.26, effective October 1, 2026