ICD-10-CM 2027
ICD-10 code for glaucoma
From the official ICD-10-CM alphabetic index entry “Glaucoma”. Page updated September 29, 2026.
About coding glaucoma
The ICD-10-CM code for glaucoma is H40.9 (Unspecified glaucoma). The official index lists 40 more specific codes, so check the documentation for details such as type, cause, site or severity before settling on H40.9.
Within H40, choose H40.9 (Unspecified glaucoma) only when documentation doesn't support a more specific option: suspect (H40.0), open-angle glaucoma (H40.1), primary angle-closure glaucoma (H40.2), secondary to eye trauma (H40.3), secondary to eye inflammation (H40.4), secondary to other eye disorders (H40.5), secondary to drugs (H40.6) and other glaucoma (H40.8).
It is not a CC or MCC, so as a secondary diagnosis it doesn't change the MS-DRG severity level.
In MS-DRG v44.0, it is part of the grouping logic for DRG 124 (Other Disorders of the Eye with MCC or Thrombolytic Agent, relative weight 1.2471) and DRG 125 (Other Disorders of the Eye without MCC, relative weight 0.7702), in MDC 02 (Diseases and Disorders of the Eye), as a principal or secondary diagnosis. The DRG a claim lands in depends on the principal diagnosis, procedures and any CC/MCC secondary diagnoses.
More specific glaucoma codes (official index)
- with
- increased episcleral venous pressure H40.81 — Glaucoma with increased episcleral venous pressure
- pseudoexfoliation of lens
- absolute H44.51 — Absolute glaucoma
- angle-closure (primary) H40.20 — Unspecified primary angle-closure glaucoma
- acute (attack) (crisis) H40.21 — Acute angle-closure glaucoma
- chronic H40.22 — Chronic angle-closure glaucoma
- intermittent H40.23 — Intermittent angle-closure glaucoma
- residual stage H40.24 — Residual stage of angle-closure glaucoma
- secondary, neovascular H40.84 — Neovascular secondary angle closure glaucoma
- borderline H40.00 — Preglaucoma, unspecified
- capsular (with pseudoexfoliation of lens)
- childhood Q15.0 — Congenital glaucoma
- closed angle
- congenital Q15.0 — Congenital glaucoma
- corticosteroid-induced
- hypersecretion H40.82 — Hypersecretion glaucoma
- in (due to)
- amyloidosis E85.4 — Organ-limited amyloidosis
- aniridia Q13.1 — Absence of iris
- concussion of globe
- dislocation of lens
- disorder of lens NEC
- drugs
- endocrine disease NOS E34.9 — Endocrine disorder, unspecified
- eye
- inflammation
- trauma
- hypermature cataract
- iridocyclitis
- lens disorder
- Lowe's syndrome E72.03 — Lowe's syndrome
- metabolic disease NOS E88.9 — Metabolic disorder, unspecified
- ocular disorders NEC
- onchocerciasis B73.02 — Onchocerciasis with glaucoma
- pupillary block
- retinal vein occlusion
- Rieger anomaly Q13.81 — Rieger anomaly
- rubeosis of iris
- tumor of globe
- infantile Q15.0 — Congenital glaucoma
- low tension
- malignant H40.83 — Aqueous misdirection
- narrow angle
- neovascular secondary angle closure H40.84 — Neovascular secondary angle closure glaucoma
- newborn Q15.0 — Congenital glaucoma
- noncongestive (chronic)
- nonobstructive
- obstructive
- due to lens changes
- open angle H40.10 — Unspecified open-angle glaucoma
- primary H40.11 — Primary open-angle glaucoma
- capsular (with pseudoexfoliation of lens) H40.14 — Capsular glaucoma with pseudoexfoliation of lens
- low-tension H40.12 — Low-tension glaucoma
- pigmentary H40.13 — Pigmentary glaucoma
- residual stage H40.15 — Residual stage of open-angle glaucoma
- phacolytic
- pigmentary
- postinfectious
- secondary (to) H40.5 — Glaucoma secondary to other eye disorders
- drugs H40.6 — Glaucoma secondary to drugs
- inflammation H40.4 — Glaucoma secondary to eye inflammation
- trauma H40.3 — Glaucoma secondary to eye trauma
- simple (chronic) H40.11 — Primary open-angle glaucoma
- simplex H40.11 — Primary open-angle glaucoma
- specified type NEC H40.89 — Other specified glaucoma
- suspect H40.00 — Preglaucoma, unspecified
- syphilitic A52.71 — Late syphilitic oculopathy
- traumatic
- newborn (birth injury) P15.3 — Birth injury to eye
- tuberculous A18.59 — Other tuberculosis of eye
Common questions about glaucoma ICD-10 codes
What is the ICD-10 code for glaucoma?
- H40.9 — Unspecified glaucoma. More specific codes apply when the documentation supports them: H40.81, H44.51, H40.20, H40.21 and others below.
What is the ICD-10 code for absolute glaucoma?
- H44.51 — Absolute glaucoma (header code; choose a more specific subcode).
What is the ICD-10 code for angle-closure glaucoma?
- H40.20 — Unspecified primary angle-closure glaucoma (header code; choose a more specific subcode).
What is the ICD-10 code for borderline glaucoma?
- H40.00 — Preglaucoma, unspecified (header code; choose a more specific subcode).
What is the ICD-10 code for childhood glaucoma?
- Q15.0 — Congenital glaucoma.
What is the ICD-10 code for congenital glaucoma?
- Q15.0 — Congenital glaucoma.
What is the ICD-10 code for hypersecretion glaucoma?
- H40.82 — Hypersecretion glaucoma (header code; choose a more specific subcode).
Is H40.9 billable?
- Yes. H40.9 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can H40.9 be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict H40.9 as a principal diagnosis.
Is H40.9 a CC or MCC?
- No. H40.9 is neither a CC nor an MCC under MS-DRG v44.0.