ICD-10-CM 2027 diagnosis code

H18Other disorders of cornea

Not billable — use a more specific code

H18 is a header code, so it can't be reported by itself. Choose one of the 10 more specific codes beneath it.

Code unchanged since ICD-10-CM took effect on October 1, 2015. Source: official FY2027 ICD-10-CM release from CDC/NCHS and CMS. Page updated September 29, 2026. About our data

About H18

H18 is the ICD-10-CM diagnosis code for other disorders of cornea. It belongs to block H15-H22 (disorders of sclera, cornea, iris and ciliary body) and chapter 7 (diseases of the eye and adnexa). It is a header code, so it can't be reported by itself; one of its 10 subcodes must be used instead.

To report this condition, pick the subcode that matches the documentation: H18.0 (deposits), H18.1 (keratopathy), H18.2 (edema), H18.3 (membranes), H18.4 (degeneration), H18.5 (dystrophies), H18.6 (Keratoconus), H18.7 (deformities) and 2 more.

It has been part of ICD-10-CM since the code set took effect on October 1, 2015 and hasn't changed since.

Specific codes under H18

Notes that apply from higher levels

Instructions written at a parent level also apply to H18.

Broader instructions also apply from Chapter 7: Diseases of the eye and adnexa.

Code history

2016
2017
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2021
2022
2023
2024
2025
2026
2027

FY2016 (effective 10/1/2015): Added (first year of ICD-10-CM)
No changes since FY2016.

Common questions about H18

Is H18 billable?: No. H18 is a header code. Report one of its more specific subcodes instead.