ICD-10 Diagnosis Code H42

Glaucoma in diseases classified elsewhere

Diagnosis Code H42

ICD-10: H42
Short Description: Glaucoma in diseases classified elsewhere
Long Description: Glaucoma in diseases classified elsewhere
This is the 2017 version of the ICD-10-CM diagnosis code H42

Code Classification
  • Diseases of the eye and adnexa
    • Glaucoma (H40-H42)
      • Glaucoma in diseases classified elsewhere (H42)

Information for Medical Professionals

Code Edits
The following edits are applicable to this code:
Manifestation diagnoses Additional informationCallout TooltipManifestation diagnoses
Manifestation codes describe the manifestation of an underlying disease, not the disease itself, and therefore should not be used as a principal diagnosis.

Diagnostic Related Groups
The diagnosis code H42 is grouped in the following Diagnostic Related Group(s) (MS-DRG v33.0)


Convert to ICD-9 Additional informationCallout TooltipGeneral Equivalence Map
The ICD-10 and ICD-9 GEMs are used to facilitate linking between the diagnosis codes in ICD-9-CM and the new ICD-10-CM code set. The GEMs are the raw material from which providers, health information vendors and payers can derive specific applied mappings to meet their needs.

  • Glaucoma associated with systemic syndromes
  • Glaucoma associated with vascular disorder
  • Glaucoma due to another disorder
  • Glaucoma due to combination of mechanisms
  • Glaucoma due to systemic syndrome
  • Glaucoma in endocrine, nutritional and metabolic diseases
  • Neovascular glaucoma
  • Neovascular glaucoma due to diabetes mellitus
  • Primary angle-closure glaucoma
  • Primary glaucoma due to combination of mechanisms
  • Rieger eye malformation sequence
  • Secondary angle-closure glaucoma
  • Secondary angle-closure glaucoma

Index of Diseases and Injuries
References found for the code H42 in the Index of Diseases and Injuries:

Information for Patients


Glaucoma is a group of diseases that can damage 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. Without treatment, people with glaucoma will slowly lose their peripheral, or side vision. They seem to be looking through a tunnel. Over time, straight-ahead vision may decrease until no vision remains.

A comprehensive eye exam can tell if you have glaucoma. 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

There is no cure, but glaucoma can usually be controlled. Early treatment can help protect your eyes against vision loss. Treatments usually include prescription eyedrops and/or surgery.

NIH: National Eye Institute

  • Glaucoma
  • Ophthalmoscopy
  • Standard ophthalmic exam
  • Tonometry

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