1. ICD-10-CM Codes
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2. H00-H59 Diseases of the eye and adnexa
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3. H40-H42 Glaucoma
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4. H40- Glaucoma
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5. 2021 ICD-10-CM Diagnosis Code H40.9

2021 ICD-10-CM Diagnosis Code H40.9

Unspecified glaucoma

2016 2017 2018 2019 2020 2021 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 2021 edition of ICD-10-CM H40.9 became effective on October 1, 2020.
• This is the American ICD-10-CM version of H40.9 - other international versions of ICD-10 H40.9 may differ.

• 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

• 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.

• 124 Other disorders of the eye with mcc
• 125 Other disorders of the eye without mcc

Convert H40.9 to ICD-9-CM

• 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

• Glaucoma H40.9

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