ICD-10 Code H18.059 – Posterior corneal pigmentations, unspecified eye (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code H18.059 – Posterior corneal pigmentations, unspecified eye
What it is
This code identifies pigment deposits on the back surface of the cornea in an unspecified eye. Use it when the record documents posterior corneal pigmentation but does not specify laterality or a more exact cause.
Clinical signs
Findings may include visible corneal pigment on slit-lamp exam, often noted on the posterior cornea. Clinical features vary; refer to documentation for the exact appearance, laterality, and any associated eye disorder.
When to use this code
Use H18.059 when the provider documents posterior corneal pigmentation and does not identify the eye involved. It also fits cases where the chart confirms the finding but gives no more specific diagnosis. Code the documented laterality if available.
Do not use for
Do not use this code for other corneal opacities, deposits, or pigment changes that are better described by a different diagnosis. Do not assign it when documentation is missing or unclear; check documentation.
Coding tip
Confirm the note says posterior corneal pigmentation and whether the right, left, or both eyes are specified before choosing this unspecified-eye code.