H18.00 Unspecified corneal deposit

ICD-10-CM H18.00: Unspecified Corneal Deposit

ICD-10-CM code H18.00 designates an unspecified corneal deposit, categorized under corneal pigmentations and deposits. The terminology record classifies this active concept as a disease or syndrome. While one source identifies H18.00 as non-billable, another coding reference lists more specific variations that specify laterality. 1 4 5

Plain-language overview

The diagnostic label for H18.00 is unspecified corneal deposit, and the terminology record classifies this active concept as a disease or syndrome within the ICD-10-CM version 2026 system. 1

What this code represents

Code H18.00 represents an unspecified corneal deposit and has no narrower concepts branching beneath it, while its parent concept is H18.0 for corneal pigmentations and deposits. 1

The parent concept for H18.00 is H18.0, which covers corneal pigmentations and deposits, placing this specific diagnosis within that broader category of corneal conditions. 1

Coding details

One coding reference designates H18.00 as a non-billable code within Chapter 7, and the code hierarchy places it under the H15-H22 block and the H18.0 category. 5

More specific variations of H18.00 exist to designate laterality, including codes for the right eye, left eye, bilateral, and unspecified eye, which provide greater documentation specificity. 4

Documentation considerations

A coding reference lists specific variations of H18.00 that designate laterality, including H18.001 for the right eye, H18.002 for the left eye, and H18.003 for bilateral cases. 4

What the sources add

One source classifies H18.00 as a non-billable code, while another source lists H18.009 as a variation for an unspecified eye within the same code hierarchy. 4 5

A terminology exploration source maps the concept of a corneal deposit to the ICD-10-CM code H18.00, confirming the semantic linkage between the clinical concept and this specific diagnostic identifier. 3

Clinical context

Corneal opacity involves stromal scarring and fibrosis that can result in irreversible vision loss, and clinical research discusses treatments like topical losartan to manage this condition. 2

Sources

1. ICD-10-CM H18.00 terminology record — National Cancer Institute Enterprise Vocabulary Services; accessed 2026-07-27.
2. Topical losartan for established corneal fibrosis with machine learning-based predictors — pmc.ncbi.nlm.nih.gov; accessed 2026-07-27.
3. EVS Explore — evsexplore.semantics.cancer.gov; accessed 2026-07-27.
4. ICD-10-CM 2024 | H18 - Other disorders of cornea — unboundmedicine.com; accessed 2026-07-27.
5. Codigo. The #1 Billing Agency for Medical Practices — codigo.care; accessed 2026-07-27.