ICD-10 Code H18.592 – Other hereditary corneal dystrophies, left eye (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code H18.592 – Other hereditary corneal dystrophies, left eye
What it is
This code identifies a hereditary corneal dystrophy affecting the left eye that does not fit a more specific named category. It is used for inherited, noninflammatory corneal disorders documented in the left eye.
Clinical signs
Clinical features vary; refer to documentation. Findings may include corneal opacities, abnormal corneal deposits, or reduced visual clarity, with the left eye specifically noted as affected.
When to use this code
Use H18.592 when the provider documents a hereditary corneal dystrophy in the left eye and no more specific corneal dystrophy code applies. It is appropriate when the diagnosis is confirmed or clearly stated in the chart. If the record does not specify the left eye, check documentation before coding.
Do not use for
Do not use this code for corneal dystrophies with a more specific named diagnosis or for conditions limited to the right eye or both eyes. Also avoid it when the chart only says corneal opacity without hereditary dystrophy.
Coding tip
Verify laterality and the exact dystrophy type in the provider note before assigning H18.592.