H40.212 Acute angle-closure glaucoma, left eye

Billable ICD-10-CM code, FY2026. Acts as a Complication or Comorbidity (CC) as a secondary diagnosis.

Applies from H40 Glaucoma

Excludes1 (never code together)

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

Applies from H40.2 Primary angle-closure glaucoma

Excludes1 (never code together)

• aqueous misdirection (H40.83-)
• malignant glaucoma (H40.83-)

Applies from H40.21 Acute angle-closure glaucoma

Applicable to

• Acute angle-closure glaucoma attack
• Acute angle-closure glaucoma crisis

MS-DRG index

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

Approximate ICD-9-CM (GEMs)

• 365.22 Acute angle-closure glaucoma (approximate)

Code annotations containing back-references to H40.212

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)")

Nearby codes

• H40.20X2 Unspecified primary angle-closure glaucoma, moderate stage
• H40.20X3 Unspecified primary angle-closure glaucoma, severe stage
• H40.20X4 Unspecified primary angle-closure glaucoma, indeterminate stage
• H40.21 Acute angle-closure glaucoma
• H40.211 Acute angle-closure glaucoma, right eye
• H40.212 Acute angle-closure glaucoma, left eye (this code)
• H40.213 Acute angle-closure glaucoma, bilateral
• H40.219 Acute angle-closure glaucoma, unspecified eye
• H40.22 Chronic angle-closure glaucoma
• H40.221 Chronic angle-closure glaucoma, right eye
• H40.2210 Chronic angle-closure glaucoma, right eye, stage unspecified