ICD-10 Code H18.73 – Descemetocele (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code H18.73 – Descemetocele
What it is
Descemetocele is an advanced corneal ulcer in which the cornea is thinned to Descemet’s membrane only. It indicates severe structural loss and a high risk of perforation.
Clinical signs
Typical findings include a deep corneal defect with marked thinning and a visible bulging area over Descemet’s membrane. Clinical features vary; refer to documentation.
When to use this code
Use this code when the record specifically documents descemetocele, corneal thinning to Descemet’s membrane, or an advanced corneal ulcer with impending perforation. You may also use it when the ophthalmologist confirms the diagnosis during examination or procedure documentation.
Do not use for
Do not use it for a superficial corneal abrasion, uncomplicated corneal ulcer, or nonspecific corneal erosion. Check documentation if the note only mentions corneal thinning without descemetocele.
Coding tip
Assign H18.73 only when the provider clearly documents descemetocele; vague “severe ulcer” wording is not enough.