ICD-10-CM Code H42

Glaucoma in diseases classified elsewhere

Version 2021 Billable Code Manifestation Diagnoses

Valid for Submission

H42 is a billable code used to specify a medical diagnosis of glaucoma in diseases classified elsewhere. The code is valid for the fiscal year 2021 for the submission of HIPAA-covered transactions. The ICD-10-CM code H42 might also be used to specify conditions or terms like glaucoma and sleep apnea syndrome, glaucoma associated with systemic syndromes, glaucoma associated with vascular disorder, glaucoma due to combination of mechanisms, glaucoma due to diabetes mellitus type 1, glaucoma due to systemic syndrome, etc

ICD-10:H42
Short Description:Glaucoma in diseases classified elsewhere
Long Description:Glaucoma in diseases classified elsewhere

Tabular List of Diseases and Injuries

The Tabular List of Diseases and Injuries is a list of ICD-10 codes, organized "head to toe" into chapters and sections with guidance for inclusions, exclusions, descriptions and more. The following references are applicable to the code H42:

Code First

Code First
Certain conditions have both an underlying etiology and multiple body system manifestations due to the underlying etiology. For such conditions, the ICD-10-CM has a coding convention that requires the underlying condition be sequenced first followed by the manifestation. Wherever such a combination exists, there is a "use additional code" note at the etiology code, and a "code first" note at the manifestation code. These instructional notes indicate the proper sequencing order of the codes, etiology followed by manifestation.

Type 1 Excludes

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.
  • glaucoma in onchocerciasis B73.02
  • glaucoma in syphilis A52.71
  • glaucoma in tuberculous A18.59

Code Edits

The Medicare Code Editor (MCE) detects and reports errors in the coding of claims data. The following ICD-10 Code Edits are applicable to this code:

  • Manifestation diagnoses - Manifestation codes describe the manifestation of an underlying disease, not the disease itself, and therefore should not be used as a principal diagnosis.

Synonyms

The following clinical terms are approximate synonyms or lay terms that might be used to identify the correct diagnosis code:

  • Glaucoma and sleep apnea syndrome
  • Glaucoma associated with systemic syndromes
  • Glaucoma associated with vascular disorder
  • Glaucoma due to combination of mechanisms
  • Glaucoma due to diabetes mellitus type 1
  • Glaucoma due to systemic syndrome
  • Glaucoma due to systemic syndrome
  • Glaucoma due to systemic syndrome
  • Glaucoma in endocrine, nutritional and metabolic diseases
  • Glaucoma of bilateral eyes due to systemic disorder
  • Glaucoma of left eye due to systemic disorder
  • Glaucoma of right eye due to systemic disorder
  • Imperforate pectinate glaucoma
  • Neovascular glaucoma
  • Neovascular glaucoma due to diabetes mellitus
  • Neovascularization of angle
  • Primary angle-closure glaucoma
  • Primary glaucoma due to combination of mechanisms
  • Rubeosis iridis
  • Secondary angle-closure glaucoma

Diagnostic Related Groups

The ICD-10 code H42 is grouped in the following groups for version MS-DRG V38.0 What are Diagnostic Related Groups?
The Diagnostic Related Groups (DRGs) are a patient classification scheme which provides a means of relating the type of patients a hospital treats. The DRGs divides all possible principal diagnoses into mutually exclusive principal diagnosis areas referred to as Major Diagnostic Categories (MDC).
applicable from 10/01/2020 through 09/30/2021.

  • 124 - OTHER DISORDERS OF THE EYE WITH MCC
  • 125 - OTHER DISORDERS OF THE EYE WITHOUT MCC

Convert H42 to ICD-9

  • 365.44 - Glaucoma w systemic synd (Approximate Flag)

Code Classification

  • Diseases of the eye and adnexa (H00–H59)
    • Glaucoma (H40-H42)
      • Glaucoma in diseases classified elsewhere (H42)

Code History

  • FY 2016 - New Code, effective from 10/1/2015 through 9/30/2016
    (First year ICD-10-CM implemented into the HIPAA code set)
  • FY 2017 - No Change, effective from 10/1/2016 through 9/30/2017
  • FY 2018 - No Change, effective from 10/1/2017 through 9/30/2018
  • FY 2019 - No Change, effective from 10/1/2018 through 9/30/2019
  • FY 2020 - No Change, effective from 10/1/2019 through 9/30/2020
  • FY 2021 - No Change, effective from 10/1/2020 through 9/30/2021

Information for Patients


Glaucoma

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 (Medical Encyclopedia)
  • Ophthalmoscopy (Medical Encyclopedia)
  • Standard ophthalmic exam (Medical Encyclopedia)
  • Tonometry (Medical Encyclopedia)

[Learn More]