Coding and coverage · ICD-10-CM

L04 Acute lymphadenitis

Not billable (header)Chapter 12

Report one of the more specific codes below.

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Codes under this one

  • L04.0 Acute lymphadenitis of face, head and neck
  • L04.1 Acute lymphadenitis of trunk
  • L04.2 Acute lymphadenitis of upper limb
  • L04.3 Acute lymphadenitis of lower limb
  • L04.8 Acute lymphadenitis of other sites
  • L04.9 Acute lymphadenitis, unspecified

Instructional notes

Chapter 12

Excludes2Not included here: the patient may have both; report both when both are present.
  • 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.-)

Section L00-L08

Excludes2Not included here: the patient may have both; report both when both are present.
  • 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 codeAdd a second code for the full picture.
  • code (B95-B97) to identify infectious agent.

This code

Excludes1Not coded here: never report with this code, except when the two conditions are unrelated.
  • chronic or subacute lymphadenitis, except mesenteric (I88.1)
  • enlarged lymph nodes (R59.-)
  • human immunodeficiency virus [HIV] disease resulting in generalized lymphadenopathy (B20)
  • lymphadenitis NOS (I88.9)
  • nonspecific mesenteric lymphadenitis (I88.0)
Includes
  • abscess (acute) of lymph nodes, except mesenteric
  • acute lymphadenitis, except mesenteric

Chapter 12: Diseases of the skin and subcutaneous tissue · L00-L08 Infections of the skin and subcutaneous tissue (L00-L08)

Source: ICD-10-CM FY 2027 code descriptions and tabular list (CMS and CDC National Center for Health Statistics), effective 2026-10-01 through 2027-09-30 · CMS ICD-10 files. HCC mapping: CMS-HCC V28, payment year 2027. As of 2026-11-04.

Coverage and payment depend on the claim details; confirm with the Medicare Administrative Contractor.