H40.9 — Unspecified glaucoma
H40.9 is a billable, specific ICD-10-CM code for unspecified glaucoma. It is valid for submission on a claim.
Risk adjustment
H40.9 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
H40.9 is named in 11 Medicare coverage policies — 11 listing it as supporting medical necessity. Which of them applies to you depends on your Medicare contractor, and coverage genuinely differs by state.
- A56457Billing and Coding: Corneal Pachymetry
- A56537Billing and Coding: Scanning Computerized Ophthalmic Diagnostic Imaging (SCODI)
- A56544Billing and Coding: Cataract Extraction
- A56548Billing and Coding: Corneal Pachymetry
How H40.9 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 H40.9.
- Glaucoma
Related codes at this level
Codes that share H40. If H40.9 is not quite right, the correct code is usually one of these.
Questions about H40.9
- Is H40.9 a billable ICD-10-CM code?
- Yes. H40.9 is a billable, specific ICD-10-CM code and is valid for submission on a claim.
- Where does H40.9 sit in the tabular list?
- Diseases of the eye and adnexa (H00-H59), in the block Glaucoma (H40-H42).