2023 ICD-10-CM Diagnosis Code H40.9

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Unspecified glaucoma

    2016 2017 2018 2019 2020 2021 2022 2023 Billable/Specific Code
  • H40.9 is a billable/specific ICD-10-CM code that can be used to indicate a diagnosis for reimbursement purposes.
  • The 2023 edition of ICD-10-CM H40.9 became effective on October 1, 2022.
  • This is the American ICD-10-CM version of H40.9 - other international versions of ICD-10 H40.9 may differ.
The following code(s) above H40.9 contain annotation back-references
Annotation Back-References
In this context, annotation back-references refer to codes that contain:
  • Applicable To annotations, or
  • Code Also annotations, or
  • Code First annotations, or
  • Excludes1 annotations, or
  • Excludes2 annotations, or
  • Includes annotations, or
  • Note annotations, or
  • Use Additional annotations
that may be applicable to H40.9:
  • H00-H59
    2023 ICD-10-CM Range H00-H59

    Diseases of the eye and adnexa

    • Use an external cause code following the code for the eye condition, if applicable, to identify the cause of the eye condition
    Type 2 Excludes
    • 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)
    Diseases of the eye and adnexa
  • H40
    ICD-10-CM Diagnosis Code H40


      2016 2017 2018 2019 2020 2021 2022 2023 Non-Billable/Non-Specific Code
    Type 1 Excludes
    • absolute glaucoma (H44.51-)
    • congenital glaucoma (Q15.0)
    • traumatic glaucoma due to birth injury (P15.3)
Approximate Synonyms
  • Bilat glaucoma
  • Bilateral glaucoma
  • Bilateral inflammatory glaucoma
  • Bilateral subcapsular glaucomatous flecks
  • Glaucoma
  • Glaucoma of bilateral eyes due to ocular inflammation
  • Glaucoma of left eye
  • Glaucoma of left eye due to ocular inflammation
  • Glaucoma of right eye
  • Glaucoma of right eye due to ocular inflammation
  • Left glaucoma
  • Left inflammatory glaucoma
  • Left inguinal hernia
  • Left subcapsular glaucomatous flecks
  • Right glaucoma
  • Right inflammatory glaucoma
  • Right subcapsular glaucomatous flecks
  • Subcapsular glaucomatous flecks, both eyes
Clinical Information
  • A condition in which there is a build-up of fluid in the eye, which presses on the retina and the optic nerve. The retina is the layer of nerve tissue inside the eye that senses light and sends images along the optic nerve to the brain. Glaucoma can damage the optic nerve and cause loss of vision or blindness.
  • A disorder characterized by an increase in pressure in the eyeball due to obstruction of the aqueous humor outflow.
  • 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 damages the eye's optic nerve. It is a leading cause of blindness in the United States. It usually happens when the fluid pressure inside the eyes slowly rises, damaging the optic nerve. Often there are no symptoms at first, but a comprehensive eye exam can detect it. People at risk should get eye exams at least every two years. They include
    • african americans over age 40
    • people over age 60, especially mexican americans
    • people with a family history of glaucoma
    early treatment can help protect your eyes against vision loss. Treatments usually include prescription eyedrops and/or surgery. nih: national eye institute
  • Group of diseases characterized by increased intraocular pressure resulting in damage to the optic nerve and retinal nerve fibers.
  • Increased pressure in the eyeball due to obstruction of the outflow of aqueous humor.
ICD-10-CM H40.9 is grouped within Diagnostic Related Group(s) (MS-DRG v40.0):
  • 124 Other disorders of the eye with mcc
  • 125 Other disorders of the eye without mcc

Convert H40.9 to ICD-9-CM

Code History
  • 2016 (effective 10/1/2015): New code (first year of non-draft ICD-10-CM)
  • 2017 (effective 10/1/2016): No change
  • 2018 (effective 10/1/2017): No change
  • 2019 (effective 10/1/2018): No change
  • 2020 (effective 10/1/2019): No change
  • 2021 (effective 10/1/2020): No change
  • 2022 (effective 10/1/2021): No change
  • 2023 (effective 10/1/2022): No change

Diagnosis Index entries containing back-references to H40.9:

ICD-10-CM Codes Adjacent To H40.9
H40.821 …… right eye
H40.822 …… left eye
H40.823 …… bilateral
H40.829 …… unspecified eye
H40.83 Aqueous misdirection
H40.831 …… right eye
H40.832 …… left eye
H40.833 …… bilateral
H40.839 …… unspecified eye
H40.89 Other specified glaucoma
H40.9 Unspecified glaucoma
H42 Glaucoma in diseases classified elsewhere
H43 Disorders of vitreous body
H43.0 Vitreous prolapse
H43.00 …… unspecified eye
H43.01 …… right eye
H43.02 …… left eye
H43.03 …… bilateral
H43.1 Vitreous hemorrhage
H43.10 …… unspecified eye
H43.11 …… right eye

Reimbursement claims with a date of service on or after October 1, 2015 require the use of ICD-10-CM codes.