L04: Acute lymphadenitis
Codes under L04 (Acute lymphadenitis). A ✓ marks a billable (fully specified) code; category codes without a ✓ are not billable on their own.
| Code | Description | Billable |
|---|---|---|
| L04.0 | Acute lymphadenitis of face, head and neck | ✓ |
| L04.0 | Acute lymphadenitis of face, head and neck | ✓ |
| L04.1 | Acute lymphadenitis of trunk | ✓ |
| L04.1 | Acute lymphadenitis of trunk | ✓ |
| L04.2 | Acute lymphadenitis of upper limb | ✓ |
| L04.2 | Acute lymphadenitis of upper limb | ✓ |
| L04.3 | Acute lymphadenitis of lower limb | ✓ |
| L04.3 | Acute lymphadenitis of lower limb | ✓ |
| L04.8 | Acute lymphadenitis of other sites | ✓ |
| L04.8 | Acute lymphadenitis of other sites | ✓ |
| L04.9 | Acute lymphadenitis, unspecified | ✓ |
| L04.9 | Acute lymphadenitis, unspecified | ✓ |
Frequently asked questions
What is ICD-10-CM code L04?
L04 is an ICD-10-CM category covering Acute lymphadenitis. It contains 12 more specific diagnosis codes, 12 of which are billable.
Is L04 a billable code?
No — L04 is a category header and isn't billable on its own. Code to the highest level of specificity using one of its subcodes (for example L04.0 — Acute lymphadenitis of face, head and neck). 12 of the 12 codes under L04 are billable.
What codes fall under L04?
L04 includes L04.0, L04.0, L04.1, L04.1, L04.2, plus 7 more. See the full list with descriptions and billable status above.
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Informational only, not coding or medical advice. Verify against the official ICD-10-CM (FY2026) and your payer's guidelines.
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