ICD-10-CM L04 is the diagnosis code for Acute lymphadenitis. This code falls under the section "Infections of the skin and subcutaneous tissue" within Chapter 12 — Diseases of the skin and subcutaneous tissue (L00-L99). It is a non-billable/non-specific ICD-10-CM code that should not be used for reimbursement. A more specific sub-code is required for billing. Medical coders and healthcare providers use this code to document and classify diagnoses in electronic health records, insurance claims, and clinical databases.
The following conditions should never be coded at the same time as L04. They are mutually exclusive:
Understanding where L04 sits in the ICD-10-CM classification helps ensure proper coding:
No, L04 is a non-billable/non-specific code. You should use a more specific sub-code for billing and reimbursement.
L04 is the ICD-10-CM diagnosis code for "Acute lymphadenitis". It is used by healthcare providers to classify and document this condition in medical records and insurance claims.
L04 is located in Section L00-L08 — "Infections of the skin and subcutaneous tissue" within Chapter 12 of the ICD-10-CM Tabular List.
L04 has 6 sub-code(s) that provide more specific detail: L04.0, L04.1, L04.2, L04.3, L04.8 and more.
Use L04 when the patients documented diagnosis matches "Acute lymphadenitis" and the clinical documentation supports this level of specificity. Always verify with the latest ICD-10-CM guidelines and payer requirements.
The ICD-10-CM code for Acute lymphadenitis is L04.
No, L04 is non-billable. Use a more specific sub-code for primary diagnosis billing.
L04 is in Chapter 12 of the ICD-10-CM Tabular List.
Type 1 Excludes for L04 include: chronic or subacute lymphadenitis, except mesenteric (I88.1); enlarged lymph nodes (R59.-); human immunodeficiency virus [HIV] disease resulting in generalized lymphadenopathy (B20) and more.
Yes, L04 is a valid ICD-10-CM code for the 2026 fiscal year, subject to official CMS updates.