2027 ICD-10-CM Diagnosis Code H40.009Preglaucoma, unspecified, unspecified eye
ICD-10-CM Codes›H00–H59›H40-H42›H40
- Billable — Valid for Submission
- Chronic Condition
H40.009 is a billable ICD-10-CM diagnosis code for preglaucoma, unspecified, unspecified eye. It is valid on HIPAA claims for fiscal year 2027 (October 1, 2026 through September 30, 2027) and groups to MS-DRG 124 through 125. Coders also document this condition as angle closure glaucoma suspect. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Glaucoma.
Code Identity
Code Classification
Approximate SynonymsGuidance
Alternate terms and clinical phrases that map to this code.
- Angle closure glaucoma suspect
- Glaucoma suspect
- Glaucoma suspect caused by corticosteroid
- Glaucoma suspect due to diabetes mellitus type 2
- Open angle glaucoma suspect
Instructional NotesGuidance
Instructions from the official ICD-10-CM Tabular List that apply to H40.009: its own notes plus those printed at H40 and Chapter 7. A note printed at a category, block or chapter applies to every code under it.
Excludes1
Not coded here: the excluded code is never reported together with this one, unless the two conditions are unrelated.
Excludes2
Not included here: the excluded condition is not part of this code, but a patient may have both, so both codes may be reported.
- certain conditions originating in the perinatal period (P04-P96)
- certain infectious and parasitic diseases (A00-B99)
- complications of pregnancy, childbirth and the puerperium (O00-O9A)
- congenital malformations, deformations, and chromosomal abnormalities (Q00-Q99)
- diabetes mellitus related eye conditions (E09.3-, E10.3-, E11.3-, E13.3-)
- endocrine, nutritional and metabolic diseases (E00-E88)
- injury (trauma) of eye and orbit (S05.-)
- injury, poisoning and certain other consequences of external causes (S00-T88)
- neoplasms (C00-D49)
- symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R94)
- syphilis related eye disorders (A50.01, A50.3-, A51.43, A52.71)
Notes
General instructions on how these codes are used.
- Use an external cause code following the code for the eye condition, if applicable, to identify the cause of the eye condition
Source: CMS ICD-10-CM Tabular List. How to read instructional notes.
Clinical ClassificationClinical
AHRQ’s CCSR groups this code into broader clinical categories.
Clinical InformationClinical
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)
Patient EducationClinical
Glaucoma
Glaucoma is a group of diseases that can damage the optic nerve of one, or both, of your eyes. This can result in vision loss. There are different types of glaucoma, but the most common type is open-angle glaucoma. Other less common types include angle-closure glaucoma, and congenital glaucoma.
The full article covers:
- What is glaucoma?
- What causes glaucoma?
- What are the symptoms of glaucoma?
- How is glaucoma diagnosed?
- What are the treatments for glaucoma?
- Can glaucoma be prevented?
Read the full article at MedlinePlus
Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.
Convert H40.009 to ICD-9-CMHistory
The closest ICD-9-CM equivalents under the General Equivalence Mappings.
Code HistoryHistory
Questions About H40.009Overview
What is the ICD-10 code for preglaucoma, unspecified, unspecified eye?
The ICD-10-CM code for preglaucoma, unspecified, unspecified eye is H40.009 (sometimes written as H40009). It is billable on HIPAA-covered claims from October 1, 2026 through September 30, 2027.
Is H40.009 (Preglaucoma, unspecified) a billable code?
Yes. This is a billable ICD-10-CM code, specific enough to report preglaucoma, unspecified, unspecified eye on HIPAA-covered claims from October 1, 2026 through September 30, 2027.
What MS-DRG does H40.009 group to?
When preglaucoma, unspecified, unspecified eye is the principal diagnosis on an inpatient stay, it groups to MS-DRG 125, 124, with relative weights from 0.7699 to 1.2470 depending on complications. Higher weights mean higher Medicare reimbursement.
Can H40.009 be reported with a code from H44.51?
Not as a rule. The Excludes1 note at H40, which applies to H40.009, lists "absolute glaucoma (H44.51-)". An Excludes1 note means the excluded code is never reported together with this one; the only exception is when the two conditions are unrelated to each other (Official Guidelines, Section I.A.12.a).
What is the ICD-9 equivalent of H40.009?
Under the General Equivalence Mappings, preglaucoma, unspecified, unspecified eye converts to ICD-9-CM 365.00 (preglaucoma NOS). The mapping is approximate, so confirm the match fits the documentation.
