ICD-10 Code I89.1 – Lymphangitis (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code I89.1 – Lymphangitis
What it is
I89.1 identifies lymphangitis, an inflammation of lymphatic vessels. You use it when the record documents inflamed lymph channels rather than a generalized skin or soft tissue infection.
Clinical signs
Clinical features vary; refer to documentation. Typical findings include tender, red streaks tracking along lymphatic channels, with possible regional lymph node enlargement and local pain or swelling.
When to use this code
Use I89.1 when the provider clearly diagnoses lymphangitis and the note supports inflammation of the lymphatic vessels. It may appear after an infection or skin injury, but you should code the documented condition, not the presumed cause. If the documentation is unclear, check documentation.
Do not use for
Do not use this code for cellulitis, abscess, or nonspecific redness without documented lymphatic involvement. Do not assign it when the record only mentions swollen lymph nodes or lymphadenitis.
Coding tip
Query the provider if the note describes streaking inflammation but does not explicitly identify lymphangitis.