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    OpenPayerBilling CodesGlaucomaICD-10-CM h42-glaucoma-in-diseases-classified-elsewhere
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    ICD-10-CM Code For Glaucoma In Diseases Classified Elsewhere: Group Overview

    The International Classification of Diseases, Tenth Revision, Clinical Modification (ICD-10-CM) code group H42 includes secondary glaucomas that are attributed to other systemic or ocular diseases, covering conditions where glaucoma is a manifestation of another primary diagnosis. These ICD-10-CM diagnosis codes are used to document clinical scenarios such as glaucoma due to inflammation, trauma, neoplasm, or other classified disorders, capturing disease severity, organ involvement, or clinical complexity relevant to this group. Accurate coding within the ICD-10-CM H42 group supports proper claim adjudication, complete clinical documentation, and appropriate reimbursement.

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    ICD-10-CM H42: Glaucoma In Diseases Classified Elsewhere Overview

    This group represents glaucomatous optic neuropathy that occurs as a consequence of underlying systemic or ocular conditions classified elsewhere, targeting the optic nerve and intraocular pressure pathways. It includes secondary glaucomas linked to other diseases and specifies laterality and chronicity where applicable. Accurate coding matters for correct clinical documentation and appropriate reimbursement because it links the glaucoma to its underlying etiology and supports claim adjudication.

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    When to Use

    Use a code from this group when glaucoma is documented as resulting from another specified systemic or ocular disease and the primary condition is coded separately. Select the code that reflects laterality and chronicity as documented in the clinical record.

    ICD-10-CM Codes

    1 rows

    ICD-10-CM CodeDescription
    H42Glaucoma in diseases classified elsewhere

    DRG Codes

    2 rows

    DRG CodeDescription
    124Other Disorders of the Eye with MCC or Thrombolytic Agent
    125Other Disorders of the Eye without MCC

    Typical Clinical Scenarios

    • A 62-year-old patient with a long history of rheumatoid arthritis treated with chronic corticosteroids presents to the ophthalmology clinic with progressive vision loss, optic nerve cupping on exam, and visual field constriction. The clinician documents glaucoma secondary to corticosteroid therapy in the affected eye(s) as the ocular hypertension and optic nerve damage are attributed to a disease classified elsewhere, prompting assignment of a code from this group. Typical codes: H42
    • A 45-year-old patient is referred for evaluation after complicated pars plana vitrectomy for proliferative diabetic retinopathy; postoperative intraocular pressure elevation and glaucomatous optic neuropathy are noted during follow-up. Because the glaucoma is directly related to the underlying ocular surgical/disease process rather than primary open-angle or angle-closure mechanisms, a code from this group is used to indicate glaucoma in diseases classified elsewhere. Typical codes: H42
    • An elderly patient with known uveitis presents emergently with acute eye pain, decreased vision, and markedly elevated intraocular pressure; examination shows inflammatory debris obstructing the trabecular meshwork and signs of glaucomatous optic nerve damage. The glaucoma is documented as secondary to intraocular inflammation (a disease classified elsewhere), so a diagnosis from this code group is recorded. Typical codes: H42

    Related Codes

    H40-GLAUCOMA-CONDITIONS

    ICD-10-CM Code For Glaucoma: Group Overview

    Frequently Asked Questions

    References

    1. 1.CPT® Codes and Descriptions. AAPC. Retrieved Aug 11, 2026.Maintains the CPT code set's official descriptions and guidelines, licensed from the American Medical Association, used as the definitional source for CPT codes on this page.
    2. 2.HCPCS Quarterly Update. Centers for Medicare & Medicaid Services (CMS). Retrieved Aug 11, 2026.CMS's quarterly release of HCPCS Level II codes and short/long descriptors, the source for HCPCS code definitions and update history.
    3. 3.ICD-10-CM Full Code List. Centers for Medicare & Medicaid Services (CMS). Retrieved Aug 11, 2026.CMS's complete ICD-10-CM diagnosis code list, used to cross-reference diagnosis codes associated with this procedure or service.
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