ICD-10 Code H10.513 – Ligneous conjunctivitis, bilateral (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code H10.513 – Ligneous conjunctivitis, bilateral
What it is
H10.513 identifies ligneous conjunctivitis affecting both eyes. It is a rare, chronic inflammatory condition of the conjunctiva that can produce firm, woody-looking membrane-like lesions.
Clinical signs
Typical findings include recurrent or persistent conjunctival pseudomembranes, eyelid swelling, redness, and irritation. Clinical features vary; refer to documentation for laterality and whether the lesions are bilateral.
When to use this code
Use H10.513 when the provider documents ligneous conjunctivitis in both eyes. Code it from ophthalmology notes, discharge summaries, or referrals that clearly state bilateral involvement. If the record does not confirm laterality, check documentation before assigning this code.
Do not use for
Do not use this code for nonspecific conjunctivitis, unilateral ligneous conjunctivitis, or other eye surface disorders. If the chart only says “conjunctivitis” without ligneous type and bilateral detail, this code is not appropriate.
Coding tip
Verify both the specific diagnosis and bilateral laterality in the provider’s note before coding H10.513.