ICD-10 Code H10.51 – Ligneous conjunctivitis (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code H10.51 – Ligneous conjunctivitis
What it is
Ligneous conjunctivitis is a rare chronic inflammatory eye disorder with firm, woody-appearing membrane formation on the conjunctiva. Use this code for the documented condition itself, not for nonspecific eye redness.
Clinical signs
Typical findings include recurrent pseudomembranes or thick, adherent conjunctival plaques, often with persistent redness and irritation. Clinical features vary; refer to documentation.
When to use this code
Use H10.51 when the provider specifically documents ligneous conjunctivitis or describes classic woody conjunctival membranes. Apply it for confirmed cases in the chart, including recurrent or chronic presentations. If the record only notes conjunctivitis without this diagnosis, check documentation.
Do not use for
Do not use this code for ordinary conjunctivitis, allergic eye irritation, or unspecified conjunctival inflammation. If the note does not clearly identify ligneous conjunctivitis, choose the documented condition instead.
Coding tip
Verify the exact wording in the ophthalmology note; this code requires a specific diagnosis, not just membrane-like conjunctival findings.