ICD-10 Code G51.2 – Melkersson’s syndrome (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code G51.2 – Melkersson’s syndrome
What it is
G51.2 identifies Melkersson’s syndrome, a rare neurologic condition classically linked to recurrent facial swelling and facial nerve palsy. Use it when the record specifically documents this syndrome.
Clinical signs
Typical findings include recurrent or persistent facial edema, facial paralysis, and sometimes a fissured tongue. Clinical features vary; refer to documentation.
When to use this code
Use this code when the provider diagnoses Melkersson’s syndrome or records the classic triad, even if not all features are present. It may also apply when the chart clearly links recurrent facial swelling with facial nerve involvement. If the diagnosis is uncertain, check documentation before coding.
Do not use for
Do not use it for isolated facial swelling, Bell’s palsy, or other facial nerve disorders without documentation of Melkersson’s syndrome. Do not assume the diagnosis from symptoms alone.
Coding tip
Code G51.2 only when the provider names Melkersson’s syndrome or documents it unmistakably.