H18.519 Endothelial corneal dystrophy, unspecified eye

ICD-10-CM H18.519: Endothelial corneal dystrophy, unspecified eye

ICD-10-CM code H18.519 represents endothelial corneal dystrophy in an unspecified eye, functioning as an active diagnosis concept under the parent category H18.51. Clinical references describe this disease class as involving progressive endothelial cell deterioration, corneal edema, and vision impairment. The unspecified eye designation is utilized when the affected eye is not currently identified in the documentation. 1 2 4

Plain-language overview

Endothelial corneal dystrophy involves dysfunctional corneal endothelial cells that can lead to fluid retention, corneal edema, and resulting vision impairment for the affected patient. 2 4

This disease is characterized by a progressive loss of endothelial cells and the development of guttata, which are excrescences located on the Descemet membrane of the eye. 2

What this code represents

The code H18.519 is an active terminology concept representing the diagnosis of endothelial corneal dystrophy when the affected eye is unspecified, and it falls under the parent concept H18.51. 1 4

Within the corneal dystrophy classification, H18.519 is listed alongside distinct laterality codes such as H18.511 for the right eye and H18.512 for the left eye. 3 5

Documentation considerations

Clinical documentation for this condition is based on slit-lamp biomicroscopy, pachymetry to assess corneal thickness, and specular microscopy to evaluate endothelial cell density. 2

The H18.519 code is meant to be used if the affected eye or eyes are currently unspecified at the moment, distinguishing it from codes specifying right, left, or bilateral eyes. 4

What the sources add

While the terminology record establishes the code hierarchy and active status, clinical references provide operational context by detailing the diagnostic methods and phenotypic characteristics of the disease. 1 2

A clinical reference distinguishes Fuchs endothelial dystrophy from cornea guttata by noting that the former presents with corneal edema, whereas a rare nonguttate form exists without Descemet membrane excrescences. 2

Coverage and utilization context

The appearance of H18.519 in a payer vision policy document provides operational listing context, but the excerpt does not establish specific coverage criteria or utilization rules for the diagnosis. 3

Sources

1. ICD-10-CM H18.519 terminology record — National Cancer Institute Enterprise Vocabulary Services; accessed 2026-07-27.
2. Bookshelf — ncbi.nlm.nih.gov; accessed 2026-07-27.
3. ICD-10 CM — point32health.org; accessed 2026-07-27.
4. Fuchs' Dystrophy ICD-10-CM Codes — carepatron.com; accessed 2026-07-27.
5. ICD-10-CM 2024 | H18 - Other disorders of cornea — unboundmedicine.com; accessed 2026-07-27.