ICD-10-CM L03.91 is the diagnosis code for Acute lymphangitis, unspecified. 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 billable/specific ICD-10-CM code that can be used to indicate a diagnosis for reimbursement purposes. 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 L03.91. They are mutually exclusive:
Understanding where L03.91 sits in the ICD-10-CM classification helps ensure proper coding:
Yes, L03.91 is a billable/specific ICD-10-CM code that can be used to indicate a diagnosis for reimbursement purposes.
L03.91 is the ICD-10-CM diagnosis code for "Acute lymphangitis, unspecified". It is used by healthcare providers to classify and document this condition in medical records and insurance claims.
The parent code of L03.91 is L03.9 ("Cellulitis and acute lymphangitis, unspecified"). L03.91 provides a more specific classification within this category.
L03.91 is located in Section L00-L08 — "Infections of the skin and subcutaneous tissue" within Chapter 12 of the ICD-10-CM Tabular List.
Use L03.91 when the patients documented diagnosis matches "Acute lymphangitis, unspecified" 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 lymphangitis, unspecified is L03.91.
Yes, L03.91 can be used as a primary diagnosis code since it is billable and specific.
L03.91 is in Chapter 12 of the ICD-10-CM Tabular List.
Type 1 Excludes for L03.91 include: lymphangitis NOS (I89.1).
Yes, L03.91 is a valid ICD-10-CM code for the 2026 fiscal year, subject to official CMS updates.