ICD-10 Code H18.799 – Other corneal deformities, unspecified eye (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code H18.799 – Other corneal deformities, unspecified eye
What it is
This code identifies a corneal shape abnormality in an unspecified eye that does not fit a more specific corneal deformity code. Use it when the record documents an unusual corneal contour or distortion, but details are limited.
Clinical signs
Clinical features vary; refer to documentation. Findings may include visible corneal irregularity, altered curvature, or reduced visual quality related to the cornea.
When to use this code
Use H18.799 when the provider documents an other corneal deformity and does not specify right or left eye. It is appropriate when the chart notes corneal shape abnormality, but not a named condition such as keratoconus or corneal ectasia. Check documentation if laterality is recorded elsewhere.
Do not use for
Do not use this code for a more specific corneal disorder when the documentation supports one. Also avoid it when the eye is identified as right or left and a laterality-specific code is available.
Coding tip
Confirm both the exact corneal diagnosis and laterality before assigning this unspecified-eye code.