H18.9 — Unspecified disorder of cornea
H18.9 is a billable, specific ICD-10-CM code for unspecified disorder of cornea. It is valid for submission on a claim.
Risk adjustment
H18.9 does not map to an HCC and does not risk-adjust under CMS-HCC V28. That is normal — most ICD-10 codes do not. It still needs to be coded correctly; it just will not move a RAF score.
Medicare coverage
H18.9 is named in 3 Medicare coverage policies — 3 listing it as supporting medical necessity. Which of them applies to you depends on your Medicare contractor, and coverage genuinely differs by state.
- A57068Billing and Coding: Ocular Photography - External
- A57483Billing and Coding: Visual Fields
- A57637Billing and Coding: Visual Field Examination
How H18.9 is indexed
Coders do not find codes by browsing the tabular list — they look them up in the alphabetic index, under the word the physician wrote. These are the index entries that lead here, so you can see which chart wordings map to H18.9.
- Keratopathy
- Disease, diseased›cornea
- Disorder›cornea
Related codes at this level
Codes that share H18. If H18.9 is not quite right, the correct code is usually one of these.
Questions about H18.9
- Is H18.9 a billable ICD-10-CM code?
- Yes. H18.9 is a billable, specific ICD-10-CM code and is valid for submission on a claim.
- Where does H18.9 sit in the tabular list?
- Diseases of the eye and adnexa (H00-H59), in the block Disorders of sclera, cornea, iris and ciliary body (H15-H22).