ICD-10 Code H18.812 – Anesthesia and hypoesthesia of cornea, left eye (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code H18.812 – Anesthesia and hypoesthesia of cornea, left eye
What it is
This code identifies reduced or absent corneal sensation in the left eye. It means the cornea is less responsive to touch, which can affect protective blinking and comfort.
Clinical signs
Clinical features vary; refer to documentation. Common findings include decreased corneal sensitivity on exam and possible foreign body sensation, dryness, or reduced blink response.
When to use this code
Use H18.812 when the provider documents anesthesia or hypoesthesia of the left cornea as a diagnosis. It is appropriate when the record clearly identifies the left eye and not just general ocular numbness.
Code it for confirmed sensory loss on corneal examination, including postoperative or neurogenic descriptions if the left side is specified. Check documentation when the note only mentions corneal irritation, pain, or reduced vision without sensory loss.
Do not use for
Do not use this code for right eye or bilateral corneal sensory loss. Do not assign it for nonspecific eye discomfort or surface disease without documented decreased corneal sensation.
Coding tip
Verify laterality and the exact wording of the eye exam before assigning H18.812.