L04.9
Acute lymphadenitis, unspecified
Billable FY2026 2025-10-01 → 2026-09-30
This is the unspecified option. 5 more
specific codes sit alongside it. Worth
checking whether the documentation supports one of them.
Exclusions 28 never code together
L04code
L00-L08block
Excludes2
- hordeolum (H00.0)H00.0
- infective dermatitis (L30.3)L30.3
- local infections of skin classified in Chapter 1
- lupus panniculitis (L93.2)L93.2
- panniculitis NOS (M79.3)M79.3
- panniculitis of neck and back (M54.0-)M54.0-
- Perlèche NOS (K13.0)K13.0
- Perlèche due to candidiasis (B37.0)B37.0
- Perlèche due to riboflavin deficiency (E53.0)E53.0
- pyogenic granuloma (L98.0)L98.0
- relapsing panniculitis [Weber-Christian] (M35.6)M35.6
- viral warts (B07.-)B07.-
- zoster (B02.-)B02.-
L00-L99chapter
Excludes2
- certain conditions originating in the perinatal period (P04-P96)P04-P96
- certain infectious and parasitic diseases (A00-B99)A00-B99
- complications of pregnancy, childbirth and the puerperium (O00-O9A)O00-O9A
- congenital malformations, deformations, and chromosomal abnormalities (Q00-Q99)Q00-Q99
- endocrine, nutritional and metabolic diseases (E00-E88)E00-E88
- lipomelanotic reticulosis (I89.8)I89.8
- neoplasms (C00-D49)C00-D49
- symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R94)R00-R94
- systemic connective tissue disorders (M30-M36)M30-M36
- viral warts (B07.-)B07.-
Excludes1 — never code together. The excluded condition and this one are mutually exclusive.
Excludes2 — not included here, but the patient may have both. Code both when documented.
Instructional notes 3
Index entries leading here 2
Alongside this code 5 same parent — L04
Additional references
AHA Coding Clinic® Licence required
Official coding advice for this code. Published by the American Hospital Association. Not included in this installation.