ICD-10 Code H18.81 – Anesthesia and hypoesthesia of cornea (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code H18.81 – Anesthesia and hypoesthesia of cornea
What it is
H18.81 identifies reduced or absent corneal sensation. The cornea may be less responsive to touch, which can increase risk of unnoticed injury and delayed healing.
Clinical signs
Clinical features vary; refer to documentation. Common findings may include decreased corneal reflex, reduced blink response, or corneal surface injury noted on exam.
When to use this code
Use this code when documentation clearly states anesthesia or hypoesthesia of the cornea, whether unilateral or bilateral. It may also fit when a provider documents reduced corneal sensation as a distinct diagnosis. If the record only mentions eye pain, dryness, or another eye disorder without sensory loss, check documentation.
Do not use for
Do not use it for general facial numbness, corneal abrasion, or corneal ulcer unless reduced corneal sensation is specifically documented. Avoid assuming the diagnosis from neurologic or postoperative findings alone.
Coding tip
Code the condition only when the provider documents corneal anesthesia or hypoesthesia, and query if the chart describes decreased corneal reflex without a stated diagnosis.