ICD-10 Code A55 – Chlamydial lymphogranuloma (venereum) (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code A55 – Chlamydial lymphogranuloma (venereum)
What it is
A55 identifies lymphogranuloma venereum, a sexually transmitted chlamydial infection caused by specific strains of Chlamydia trachomatis. Use it when the record documents LGV or chlamydial lymphogranuloma.
Clinical signs
Clinical features vary; refer to documentation. Commonly noted findings include genital lesions, tender inguinal lymphadenopathy, or proctitis in affected patients.
When to use this code
Use A55 when the clinician diagnoses lymphogranuloma venereum or chlamydial lymphogranuloma. It also fits documented LGV-related genital, inguinal, or rectal infection when the provider clearly identifies the condition. If the note only says chlamydia without LGV, check documentation.
Do not use for
Do not use A55 for uncomplicated chlamydial infections, such as routine urogenital or rectal chlamydia without LGV. Also avoid it when the diagnosis is uncertain or not documented; check documentation.
Coding tip
Code A55 only when the provider explicitly links the infection to lymphogranuloma venereum, not just a positive chlamydia result.