H40.9 Unspecified glaucoma

Billable ICD-10-CM code, FY2026.

Applies from H40 Glaucoma

Excludes1 (never code together)

• absolute glaucoma (H44.51-)
• congenital glaucoma (Q15.0)
• traumatic glaucoma due to birth injury (P15.3)

Risk adjustment (HCC)

• RxHCC V08: HCC 244 — Other Non-Acute Glaucoma

MS-DRG index

Defines the logic of DRG(s) 124-125 in MDC 02.

Approximate ICD-9-CM (GEMs)

• 365.9 Unspecified glaucoma

Code annotations containing back-references to H40.9

Back-references to H40

• Use Additional: E08.39 Diabetes mellitus due to underlying condition with other diabetic ophthalmic complication ("diabetic glaucoma (H40-H42)")
• Use Additional: E09.39 Drug or chemical induced diabetes mellitus with other diabetic ophthalmic complication ("diabetic glaucoma (H40-H42)")
• Use Additional: E10.39 Type 1 diabetes mellitus with other diabetic ophthalmic complication ("diabetic glaucoma (H40-H42)")
• Use Additional: E11.39 Type 2 diabetes mellitus with other diabetic ophthalmic complication ("diabetic glaucoma (H40-H42)")
• Use Additional: E13.39 Other specified diabetes mellitus with other diabetic ophthalmic complication ("diabetic glaucoma (H40-H42)")
• Code First: H26.23 Glaucomatous flecks (subcapsular) ("underlying glaucoma (H40-H42)")

Diagnosis Index entries for H40.9

• Glaucoma

Nearby codes

• H40.841 Neovascular secondary angle closure glaucoma, right eye
• H40.842 Neovascular secondary angle closure glaucoma, left eye
• H40.843 Neovascular secondary angle closure glaucoma, bilateral
• H40.849 Neovascular secondary angle closure glaucoma, unspecified eye
• H40.89 Other specified glaucoma
• H40.9 Unspecified glaucoma (this code)