ICD-10-CM Tabular Index · Chapter 7 · FY 2026 H40

Glaucoma (H40) ICD-10-CM

The H40 code range covers glaucoma with 319 ICD-10-CM diagnosis codes. 252 of them are billable and valid for claim submission in fiscal year 2026, and the category headers group them but cannot themselves be billed.

✓ Built from the official CMS FY 2026 datasetEffective Oct 1, 2025 – Sep 30, 2026
319
Diagnosis Codes
252
Billable Codes
H40
Code Range
H40–H42
Parent Section

Type 1 Excludes

A type 1 excludes note is a pure excludes note. It means "NOT CODED HERE!" An Excludes1 note indicates that the code excluded should never be used at the same time as the code above the Excludes1 note. An Excludes1 is used when two conditions cannot occur together, such as a congenital form versus an acquired form of the same condition.

ICD-10-CM

Codes in the H40 Range 319 codes · 252 billable

319 of 319 shown
  • H40 GlaucomaNon-billable
  • H40.0 Glaucoma suspectNon-billable
  • H40.00 Preglaucoma, unspecifiedNon-billable
  • H40.001 Preglaucoma, unspecified, right eye
  • H40.002 Preglaucoma, unspecified, left eye
  • H40.003 Preglaucoma, unspecified, bilateral
  • H40.009 Preglaucoma, unspecified, unspecified eye
  • H40.01 Open angle with borderline findings, low riskNon-billable
  • H40.011 Open angle with borderline findings, low risk, right eye
  • H40.012 Open angle with borderline findings, low risk, left eye
  • H40.013 Open angle with borderline findings, low risk, bilateral
  • H40.019 Open angle with borderline findings, low risk, unspecified eye
  • H40.02 Open angle with borderline findings, high riskNon-billable
  • H40.021 Open angle with borderline findings, high risk, right eye
  • H40.022 Open angle with borderline findings, high risk, left eye
  • H40.023 Open angle with borderline findings, high risk, bilateral
  • H40.029 Open angle with borderline findings, high risk, unspecified eye
  • H40.03 Anatomical narrow angleNon-billable
  • H40.031 Anatomical narrow angle, right eye
  • H40.032 Anatomical narrow angle, left eye
  • H40.033 Anatomical narrow angle, bilateral
  • H40.039 Anatomical narrow angle, unspecified eye
  • H40.04 Steroid responderNon-billable
  • H40.041 Steroid responder, right eye
  • H40.042 Steroid responder, left eye
  • H40.043 Steroid responder, bilateral
  • H40.049 Steroid responder, unspecified eye
  • H40.05 Ocular hypertensionNon-billable
  • H40.051 Ocular hypertension, right eye
  • H40.052 Ocular hypertension, left eye
  • H40.053 Ocular hypertension, bilateral
  • H40.059 Ocular hypertension, unspecified eye
  • H40.06 Primary angle closure without glaucoma damageNon-billable
  • H40.061 Primary angle closure without glaucoma damage, right eye
  • H40.062 Primary angle closure without glaucoma damage, left eye
  • H40.063 Primary angle closure without glaucoma damage, bilateral
  • H40.069 Primary angle closure without glaucoma damage, unspecified eye
  • H40.1 Open-angle glaucomaNon-billable
  • H40.10 Unspecified open-angle glaucomaNon-billable
  • H40.10X0 Unspecified open-angle glaucoma, stage unspecified
  • H40.10X1 Unspecified open-angle glaucoma, mild stage
  • H40.10X2 Unspecified open-angle glaucoma, moderate stage
  • H40.10X3 Unspecified open-angle glaucoma, severe stage
  • H40.10X4 Unspecified open-angle glaucoma, indeterminate stage
  • H40.11 Primary open-angle glaucomaNon-billable
  • H40.111 Primary open-angle glaucoma, right eyeNon-billable
  • H40.1110 Primary open-angle glaucoma, right eye, stage unspecified
  • H40.1111 Primary open-angle glaucoma, right eye, mild stage
  • H40.1112 Primary open-angle glaucoma, right eye, moderate stage
  • H40.1113 Primary open-angle glaucoma, right eye, severe stage
  • H40.1114 Primary open-angle glaucoma, right eye, indeterminate stage
  • H40.112 Primary open-angle glaucoma, left eyeNon-billable
  • H40.1120 Primary open-angle glaucoma, left eye, stage unspecified
  • H40.1121 Primary open-angle glaucoma, left eye, mild stage
  • H40.1122 Primary open-angle glaucoma, left eye, moderate stage
  • H40.1123 Primary open-angle glaucoma, left eye, severe stage
  • H40.1124 Primary open-angle glaucoma, left eye, indeterminate stage
  • H40.113 Primary open-angle glaucoma, bilateralNon-billable
  • H40.1130 Primary open-angle glaucoma, bilateral, stage unspecified
  • H40.1131 Primary open-angle glaucoma, bilateral, mild stage
  • H40.1132 Primary open-angle glaucoma, bilateral, moderate stage
  • H40.1133 Primary open-angle glaucoma, bilateral, severe stage
  • H40.1134 Primary open-angle glaucoma, bilateral, indeterminate stage
  • H40.119 Primary open-angle glaucoma, unspecified eyeNon-billable
  • H40.1190 Primary open-angle glaucoma, unspecified eye, stage unspecified
  • H40.1191 Primary open-angle glaucoma, unspecified eye, mild stage
  • H40.1192 Primary open-angle glaucoma, unspecified eye, moderate stage
  • H40.1193 Primary open-angle glaucoma, unspecified eye, severe stage
  • H40.1194 Primary open-angle glaucoma, unspecified eye, indeterminate stage
  • H40.12 Low-tension glaucomaNon-billable
  • H40.121 Low-tension glaucoma, right eyeNon-billable
  • H40.1210 Low-tension glaucoma, right eye, stage unspecified
  • H40.1211 Low-tension glaucoma, right eye, mild stage
  • H40.1212 Low-tension glaucoma, right eye, moderate stage
  • H40.1213 Low-tension glaucoma, right eye, severe stage
  • H40.1214 Low-tension glaucoma, right eye, indeterminate stage
  • H40.122 Low-tension glaucoma, left eyeNon-billable
  • H40.1220 Low-tension glaucoma, left eye, stage unspecified
  • H40.1221 Low-tension glaucoma, left eye, mild stage
  • H40.1222 Low-tension glaucoma, left eye, moderate stage
  • H40.1223 Low-tension glaucoma, left eye, severe stage
  • H40.1224 Low-tension glaucoma, left eye, indeterminate stage
  • H40.123 Low-tension glaucoma, bilateralNon-billable
  • H40.1230 Low-tension glaucoma, bilateral, stage unspecified
  • H40.1231 Low-tension glaucoma, bilateral, mild stage
  • H40.1232 Low-tension glaucoma, bilateral, moderate stage
  • H40.1233 Low-tension glaucoma, bilateral, severe stage
  • H40.1234 Low-tension glaucoma, bilateral, indeterminate stage
  • H40.129 Low-tension glaucoma, unspecified eyeNon-billable
  • H40.1290 Low-tension glaucoma, unspecified eye, stage unspecified
  • H40.1291 Low-tension glaucoma, unspecified eye, mild stage
  • H40.1292 Low-tension glaucoma, unspecified eye, moderate stage
  • H40.1293 Low-tension glaucoma, unspecified eye, severe stage
  • H40.1294 Low-tension glaucoma, unspecified eye, indeterminate stage
  • H40.13 Pigmentary glaucomaNon-billable
  • H40.131 Pigmentary glaucoma, right eyeNon-billable
  • H40.1310 Pigmentary glaucoma, right eye, stage unspecified
  • H40.1311 Pigmentary glaucoma, right eye, mild stage
  • H40.1312 Pigmentary glaucoma, right eye, moderate stage
  • H40.1313 Pigmentary glaucoma, right eye, severe stage
  • H40.1314 Pigmentary glaucoma, right eye, indeterminate stage
  • H40.132 Pigmentary glaucoma, left eyeNon-billable
  • H40.1320 Pigmentary glaucoma, left eye, stage unspecified
  • H40.1321 Pigmentary glaucoma, left eye, mild stage
  • H40.1322 Pigmentary glaucoma, left eye, moderate stage
  • H40.1323 Pigmentary glaucoma, left eye, severe stage
  • H40.1324 Pigmentary glaucoma, left eye, indeterminate stage
  • H40.133 Pigmentary glaucoma, bilateralNon-billable
  • H40.1330 Pigmentary glaucoma, bilateral, stage unspecified
  • H40.1331 Pigmentary glaucoma, bilateral, mild stage
  • H40.1332 Pigmentary glaucoma, bilateral, moderate stage
  • H40.1333 Pigmentary glaucoma, bilateral, severe stage
  • H40.1334 Pigmentary glaucoma, bilateral, indeterminate stage
  • H40.139 Pigmentary glaucoma, unspecified eyeNon-billable
  • H40.1390 Pigmentary glaucoma, unspecified eye, stage unspecified
  • H40.1391 Pigmentary glaucoma, unspecified eye, mild stage
  • H40.1392 Pigmentary glaucoma, unspecified eye, moderate stage
  • H40.1393 Pigmentary glaucoma, unspecified eye, severe stage
  • H40.1394 Pigmentary glaucoma, unspecified eye, indeterminate stage
  • H40.14 Capsular glaucoma with pseudoexfoliation of lensNon-billable
  • H40.141 Capsular glaucoma with pseudoexfoliation of lens, right eyeNon-billable
  • H40.1410 Capsular glaucoma with pseudoexfoliation of lens, right eye, stage unspecified
  • H40.1411 Capsular glaucoma with pseudoexfoliation of lens, right eye, mild stage
  • H40.1412 Capsular glaucoma with pseudoexfoliation of lens, right eye, moderate stage
  • H40.1413 Capsular glaucoma with pseudoexfoliation of lens, right eye, severe stage
  • H40.1414 Capsular glaucoma with pseudoexfoliation of lens, right eye, indeterminate stage
  • H40.142 Capsular glaucoma with pseudoexfoliation of lens, left eyeNon-billable
  • H40.1420 Capsular glaucoma with pseudoexfoliation of lens, left eye, stage unspecified
  • H40.1421 Capsular glaucoma with pseudoexfoliation of lens, left eye, mild stage
  • H40.1422 Capsular glaucoma with pseudoexfoliation of lens, left eye, moderate stage
  • H40.1423 Capsular glaucoma with pseudoexfoliation of lens, left eye, severe stage
  • H40.1424 Capsular glaucoma with pseudoexfoliation of lens, left eye, indeterminate stage
  • H40.143 Capsular glaucoma with pseudoexfoliation of lens, bilateralNon-billable
  • H40.1430 Capsular glaucoma with pseudoexfoliation of lens, bilateral, stage unspecified
  • H40.1431 Capsular glaucoma with pseudoexfoliation of lens, bilateral, mild stage
  • H40.1432 Capsular glaucoma with pseudoexfoliation of lens, bilateral, moderate stage
  • H40.1433 Capsular glaucoma with pseudoexfoliation of lens, bilateral, severe stage
  • H40.1434 Capsular glaucoma with pseudoexfoliation of lens, bilateral, indeterminate stage
  • H40.149 Capsular glaucoma with pseudoexfoliation of lens, unspecified eyeNon-billable
  • H40.1490 Capsular glaucoma with pseudoexfoliation of lens, unspecified eye, stage unspecified
  • H40.1491 Capsular glaucoma with pseudoexfoliation of lens, unspecified eye, mild stage
  • H40.1492 Capsular glaucoma with pseudoexfoliation of lens, unspecified eye, moderate stage
  • H40.1493 Capsular glaucoma with pseudoexfoliation of lens, unspecified eye, severe stage
  • H40.1494 Capsular glaucoma with pseudoexfoliation of lens, unspecified eye, indeterminate stage
  • H40.15 Residual stage of open-angle glaucomaNon-billable
  • H40.151 Residual stage of open-angle glaucoma, right eye
  • H40.152 Residual stage of open-angle glaucoma, left eye
  • H40.153 Residual stage of open-angle glaucoma, bilateral
  • H40.159 Residual stage of open-angle glaucoma, unspecified eye
  • H40.2 Primary angle-closure glaucomaNon-billable
  • H40.20 Unspecified primary angle-closure glaucomaNon-billable
  • H40.20X0 Unspecified primary angle-closure glaucoma, stage unspecified
  • H40.20X1 Unspecified primary angle-closure glaucoma, mild stage
  • 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 glaucomaNon-billable
  • H40.211 Acute angle-closure glaucoma, right eye
  • H40.212 Acute angle-closure glaucoma, left eye
  • H40.213 Acute angle-closure glaucoma, bilateral
  • H40.219 Acute angle-closure glaucoma, unspecified eye
  • H40.22 Chronic angle-closure glaucomaNon-billable
  • H40.221 Chronic angle-closure glaucoma, right eyeNon-billable
  • H40.2210 Chronic angle-closure glaucoma, right eye, stage unspecified
  • H40.2211 Chronic angle-closure glaucoma, right eye, mild stage
  • H40.2212 Chronic angle-closure glaucoma, right eye, moderate stage
  • H40.2213 Chronic angle-closure glaucoma, right eye, severe stage
  • H40.2214 Chronic angle-closure glaucoma, right eye, indeterminate stage
  • H40.222 Chronic angle-closure glaucoma, left eyeNon-billable
  • H40.2220 Chronic angle-closure glaucoma, left eye, stage unspecified
  • H40.2221 Chronic angle-closure glaucoma, left eye, mild stage
  • H40.2222 Chronic angle-closure glaucoma, left eye, moderate stage
  • H40.2223 Chronic angle-closure glaucoma, left eye, severe stage
  • H40.2224 Chronic angle-closure glaucoma, left eye, indeterminate stage
  • H40.223 Chronic angle-closure glaucoma, bilateralNon-billable
  • H40.2230 Chronic angle-closure glaucoma, bilateral, stage unspecified
  • H40.2231 Chronic angle-closure glaucoma, bilateral, mild stage
  • H40.2232 Chronic angle-closure glaucoma, bilateral, moderate stage
  • H40.2233 Chronic angle-closure glaucoma, bilateral, severe stage
  • H40.2234 Chronic angle-closure glaucoma, bilateral, indeterminate stage
  • H40.229 Chronic angle-closure glaucoma, unspecified eyeNon-billable
  • H40.2290 Chronic angle-closure glaucoma, unspecified eye, stage unspecified
  • H40.2291 Chronic angle-closure glaucoma, unspecified eye, mild stage
  • H40.2292 Chronic angle-closure glaucoma, unspecified eye, moderate stage
  • H40.2293 Chronic angle-closure glaucoma, unspecified eye, severe stage
  • H40.2294 Chronic angle-closure glaucoma, unspecified eye, indeterminate stage
  • H40.23 Intermittent angle-closure glaucomaNon-billable
  • H40.231 Intermittent angle-closure glaucoma, right eye
  • H40.232 Intermittent angle-closure glaucoma, left eye
  • H40.233 Intermittent angle-closure glaucoma, bilateral
  • H40.239 Intermittent angle-closure glaucoma, unspecified eye
  • H40.24 Residual stage of angle-closure glaucomaNon-billable
  • H40.241 Residual stage of angle-closure glaucoma, right eye
  • H40.242 Residual stage of angle-closure glaucoma, left eye
  • H40.243 Residual stage of angle-closure glaucoma, bilateral
  • H40.249 Residual stage of angle-closure glaucoma, unspecified eye
  • H40.3 Glaucoma secondary to eye traumaNon-billable
  • H40.30 Glaucoma secondary to eye trauma, unspecified eyeNon-billable
  • H40.30X0 Glaucoma secondary to eye trauma, unspecified eye, stage unspecified
  • H40.30X1 Glaucoma secondary to eye trauma, unspecified eye, mild stage
  • H40.30X2 Glaucoma secondary to eye trauma, unspecified eye, moderate stage
  • H40.30X3 Glaucoma secondary to eye trauma, unspecified eye, severe stage
  • H40.30X4 Glaucoma secondary to eye trauma, unspecified eye, indeterminate stage
  • H40.31 Glaucoma secondary to eye trauma, right eyeNon-billable
  • H40.31X0 Glaucoma secondary to eye trauma, right eye, stage unspecified
  • H40.31X1 Glaucoma secondary to eye trauma, right eye, mild stage
  • H40.31X2 Glaucoma secondary to eye trauma, right eye, moderate stage
  • H40.31X3 Glaucoma secondary to eye trauma, right eye, severe stage
  • H40.31X4 Glaucoma secondary to eye trauma, right eye, indeterminate stage
  • H40.32 Glaucoma secondary to eye trauma, left eyeNon-billable
  • H40.32X0 Glaucoma secondary to eye trauma, left eye, stage unspecified
  • H40.32X1 Glaucoma secondary to eye trauma, left eye, mild stage
  • H40.32X2 Glaucoma secondary to eye trauma, left eye, moderate stage
  • H40.32X3 Glaucoma secondary to eye trauma, left eye, severe stage
  • H40.32X4 Glaucoma secondary to eye trauma, left eye, indeterminate stage
  • H40.33 Glaucoma secondary to eye trauma, bilateralNon-billable
  • H40.33X0 Glaucoma secondary to eye trauma, bilateral, stage unspecified
  • H40.33X1 Glaucoma secondary to eye trauma, bilateral, mild stage
  • H40.33X2 Glaucoma secondary to eye trauma, bilateral, moderate stage
  • H40.33X3 Glaucoma secondary to eye trauma, bilateral, severe stage
  • H40.33X4 Glaucoma secondary to eye trauma, bilateral, indeterminate stage
  • H40.4 Glaucoma secondary to eye inflammationNon-billable
  • H40.40 Glaucoma secondary to eye inflammation, unspecified eyeNon-billable
  • H40.40X0 Glaucoma secondary to eye inflammation, unspecified eye, stage unspecified
  • H40.40X1 Glaucoma secondary to eye inflammation, unspecified eye, mild stage
  • H40.40X2 Glaucoma secondary to eye inflammation, unspecified eye, moderate stage
  • H40.40X3 Glaucoma secondary to eye inflammation, unspecified eye, severe stage
  • H40.40X4 Glaucoma secondary to eye inflammation, unspecified eye, indeterminate stage
  • H40.41 Glaucoma secondary to eye inflammation, right eyeNon-billable
  • H40.41X0 Glaucoma secondary to eye inflammation, right eye, stage unspecified
  • H40.41X1 Glaucoma secondary to eye inflammation, right eye, mild stage
  • H40.41X2 Glaucoma secondary to eye inflammation, right eye, moderate stage
  • H40.41X3 Glaucoma secondary to eye inflammation, right eye, severe stage
  • H40.41X4 Glaucoma secondary to eye inflammation, right eye, indeterminate stage
  • H40.42 Glaucoma secondary to eye inflammation, left eyeNon-billable
  • H40.42X0 Glaucoma secondary to eye inflammation, left eye, stage unspecified
  • H40.42X1 Glaucoma secondary to eye inflammation, left eye, mild stage
  • H40.42X2 Glaucoma secondary to eye inflammation, left eye, moderate stage
  • H40.42X3 Glaucoma secondary to eye inflammation, left eye, severe stage
  • H40.42X4 Glaucoma secondary to eye inflammation, left eye, indeterminate stage
  • H40.43 Glaucoma secondary to eye inflammation, bilateralNon-billable
  • H40.43X0 Glaucoma secondary to eye inflammation, bilateral, stage unspecified
  • H40.43X1 Glaucoma secondary to eye inflammation, bilateral, mild stage
  • H40.43X2 Glaucoma secondary to eye inflammation, bilateral, moderate stage
  • H40.43X3 Glaucoma secondary to eye inflammation, bilateral, severe stage
  • H40.43X4 Glaucoma secondary to eye inflammation, bilateral, indeterminate stage
  • H40.5 Glaucoma secondary to other eye disordersNon-billable
  • H40.50 Glaucoma secondary to other eye disorders, unspecified eyeNon-billable
  • H40.50X0 Glaucoma secondary to other eye disorders, unspecified eye, stage unspecified
  • H40.50X1 Glaucoma secondary to other eye disorders, unspecified eye, mild stage
  • H40.50X2 Glaucoma secondary to other eye disorders, unspecified eye, moderate stage
  • H40.50X3 Glaucoma secondary to other eye disorders, unspecified eye, severe stage
  • H40.50X4 Glaucoma secondary to other eye disorders, unspecified eye, indeterminate stage
  • H40.51 Glaucoma secondary to other eye disorders, right eyeNon-billable
  • H40.51X0 Glaucoma secondary to other eye disorders, right eye, stage unspecified
  • H40.51X1 Glaucoma secondary to other eye disorders, right eye, mild stage
  • H40.51X2 Glaucoma secondary to other eye disorders, right eye, moderate stage
  • H40.51X3 Glaucoma secondary to other eye disorders, right eye, severe stage
  • H40.51X4 Glaucoma secondary to other eye disorders, right eye, indeterminate stage
  • H40.52 Glaucoma secondary to other eye disorders, left eyeNon-billable
  • H40.52X0 Glaucoma secondary to other eye disorders, left eye, stage unspecified
  • H40.52X1 Glaucoma secondary to other eye disorders, left eye, mild stage
  • H40.52X2 Glaucoma secondary to other eye disorders, left eye, moderate stage
  • H40.52X3 Glaucoma secondary to other eye disorders, left eye, severe stage
  • H40.52X4 Glaucoma secondary to other eye disorders, left eye, indeterminate stage
  • H40.53 Glaucoma secondary to other eye disorders, bilateralNon-billable
  • H40.53X0 Glaucoma secondary to other eye disorders, bilateral, stage unspecified
  • H40.53X1 Glaucoma secondary to other eye disorders, bilateral, mild stage
  • H40.53X2 Glaucoma secondary to other eye disorders, bilateral, moderate stage
  • H40.53X3 Glaucoma secondary to other eye disorders, bilateral, severe stage
  • H40.53X4 Glaucoma secondary to other eye disorders, bilateral, indeterminate stage
  • H40.6 Glaucoma secondary to drugsNon-billable
  • H40.60 Glaucoma secondary to drugs, unspecified eyeNon-billable
  • H40.60X0 Glaucoma secondary to drugs, unspecified eye, stage unspecified
  • H40.60X1 Glaucoma secondary to drugs, unspecified eye, mild stage
  • H40.60X2 Glaucoma secondary to drugs, unspecified eye, moderate stage
  • H40.60X3 Glaucoma secondary to drugs, unspecified eye, severe stage
  • H40.60X4 Glaucoma secondary to drugs, unspecified eye, indeterminate stage
  • H40.61 Glaucoma secondary to drugs, right eyeNon-billable
  • H40.61X0 Glaucoma secondary to drugs, right eye, stage unspecified
  • H40.61X1 Glaucoma secondary to drugs, right eye, mild stage
  • H40.61X2 Glaucoma secondary to drugs, right eye, moderate stage
  • H40.61X3 Glaucoma secondary to drugs, right eye, severe stage
  • H40.61X4 Glaucoma secondary to drugs, right eye, indeterminate stage
  • H40.62 Glaucoma secondary to drugs, left eyeNon-billable
  • H40.62X0 Glaucoma secondary to drugs, left eye, stage unspecified
  • H40.62X1 Glaucoma secondary to drugs, left eye, mild stage
  • H40.62X2 Glaucoma secondary to drugs, left eye, moderate stage
  • H40.62X3 Glaucoma secondary to drugs, left eye, severe stage
  • H40.62X4 Glaucoma secondary to drugs, left eye, indeterminate stage
  • H40.63 Glaucoma secondary to drugs, bilateralNon-billable
  • H40.63X0 Glaucoma secondary to drugs, bilateral, stage unspecified
  • H40.63X1 Glaucoma secondary to drugs, bilateral, mild stage
  • H40.63X2 Glaucoma secondary to drugs, bilateral, moderate stage
  • H40.63X3 Glaucoma secondary to drugs, bilateral, severe stage
  • H40.63X4 Glaucoma secondary to drugs, bilateral, indeterminate stage
  • H40.8 Other glaucomaNon-billable
  • H40.81 Glaucoma with increased episcleral venous pressureNon-billable
  • H40.811 Glaucoma with increased episcleral venous pressure, right eye
  • H40.812 Glaucoma with increased episcleral venous pressure, left eye
  • H40.813 Glaucoma with increased episcleral venous pressure, bilateral
  • H40.819 Glaucoma with increased episcleral venous pressure, unspecified eye
  • H40.82 Hypersecretion glaucomaNon-billable
  • H40.821 Hypersecretion glaucoma, right eye
  • H40.822 Hypersecretion glaucoma, left eye
  • H40.823 Hypersecretion glaucoma, bilateral
  • H40.829 Hypersecretion glaucoma, unspecified eye
  • H40.83 Aqueous misdirectionNon-billable
  • H40.831 Aqueous misdirection, right eye
  • H40.832 Aqueous misdirection, left eye
  • H40.833 Aqueous misdirection, bilateral
  • H40.839 Aqueous misdirection, unspecified eye
  • H40.84 Neovascular secondary angle closure glaucomaNon-billable
  • H40.841 Neovascular secondary angle closure glaucoma, right eye New
  • H40.842 Neovascular secondary angle closure glaucoma, left eye New
  • H40.843 Neovascular secondary angle closure glaucoma, bilateral New
  • H40.849 Neovascular secondary angle closure glaucoma, unspecified eye New
  • H40.89 Other specified glaucoma
  • H40.9 Unspecified glaucoma

Clinical Terms in This Code Range

Definitions from the National Library of Medicine for conditions coded in the H40 range.

Exfoliation Syndrome

The deposition of flaky, translucent fibrillar material most conspicuous on the anterior lens capsule and pupillary margin but also in both surfaces of the iris, the zonules, trabecular meshwork, ciliary body, corneal endothelium, and orbital blood vessels. It sometimes forms a membrane on the anterior iris surface. Exfoliation refers to the shedding of pigment by the iris. (Newell, Ophthalmology, 7th ed, p380)

Glaucoma

An ocular disease, occurring in many forms, having as its primary characteristics an unstable or a sustained increase in the intraocular pressure which the eye cannot withstand without damage to its structure or impairment of its function. The consequences of the increased pressure may be manifested in a variety of symptoms, depending upon type and severity, such as excavation of the optic disk, hardness of the eyeball, corneal anesthesia, reduced visual acuity, seeing of colored halos around lights, disturbed dark adaptation, visual field defects, and headaches. (Dictionary of Visual Science, 4th ed)

Glaucoma Drainage Implants

Devices, usually incorporating unidirectional valves, which are surgically inserted in the sclera to maintain normal intraocular pressure.

Glaucoma, Angle-Closure

A form of glaucoma in which the intraocular pressure increases because the angle of the anterior chamber is blocked and the aqueous humor cannot drain from the anterior chamber.

Glaucoma, Neovascular

A form of secondary glaucoma which develops as a consequence of another ocular disease and is attributed to the forming of new vessels in the angle of the anterior chamber.

Glaucoma, Open-Angle

Glaucoma in which the angle of the anterior chamber is open and the trabecular meshwork does not encroach on the base of the iris.

Low Tension Glaucoma

A form of glaucoma in which chronic optic nerve damage and loss of vision normally attributable to buildup of intraocular pressure occurs despite prevailing conditions of normal intraocular pressure.

Ocular Hypertension

A condition in which the intraocular pressure is elevated above normal and which may lead to glaucoma.

Weill-Marchesani Syndrome

Rare congenital disorder of connective tissue characterized by brachydactyly, joint stiffness, childhood onset of ocular abnormalities (e.g., microspherophakia, ECTOPIA LENTIS; GLAUCOMA), and proportionate short stature. Cardiovascular anomalies are occasionally seen.

About the H40 Code Range

ICD-10 code section H40 covers a broad range of diagnoses related to glaucoma, a group of eye conditions that damage the optic nerve, often linked with increased eye pressure. This classification enables precise coding from suspicion of glaucoma to detailed subtypes and stages, addressing affected eyes separately or bilaterally.

This section includes codes for conditions such as glaucoma suspect (H40.0), various forms of open-angle glaucoma and angle-closure glaucoma, as well as specific types like low-tension glaucoma, pigmentary glaucoma, and capsular glaucoma with pseudoexfoliation. Subcodes identify laterality (right, left, bilateral) and disease stages (unspecified, mild, moderate, severe, indeterminate). Synonyms such as angle closure glaucoma suspect, acute angle-closure glaucoma, primary open angle glaucoma, drug-induced glaucoma, ocular hypertension, and others help clarify code selection, aiding coders in matching clinical documentation to the correct ICD-10 code for glaucoma subtypes. Codes also address glaucoma secondary to trauma, inflammation, drugs, and other eye disorders, ensuring comprehensive coverage for different etiologies and presentations.

Medical coders should use this detailed hierarchy within the H40 ICD-10 code block to reflect the exact glaucoma diagnosis, side affected, and stage severity, improving specificity in medical records and billing.

Questions About This Page

How many billable codes are in the H40 range?

Of the 319 codes in this range, 252 are billable and valid for claim submission from October 1, 2025 through September 30, 2026. Category header codes group them but cannot be reported on claims.

What does the H40 range classify?

The range classifies glaucoma. Each code links to its own reference page with billing status, MS-DRG grouping, coding notes, and clinical information.

Related References

All ICD-10-CM ChaptersAll of Chapter 7ICD-10-CM Code LookupMS-DRG ReferenceMedicare Code EditsPOA Exempt Codes

Source: CMS FY 2026 ICD-10-CM Tabular List and order file, effective October 1, 2025 through September 30, 2026.