ICD-10 H42
Billable / SpecificGlaucoma in diseases classified elsewhere
About ICD-10-CM H42
ICD-10-CM code H42 represents Glaucoma in diseases classified elsewhere. This is a billable/specific code in the Eye and Adnexa chapter (block H42). The 2026 edition of ICD-10-CM H42 became effective on October 1, 2025.
Type 1 Excludes
Pure excludes, these codes can never be coded together with H42. The conditions are mutually exclusive (e.g., congenital vs acquired forms).
- glaucoma (in) onchocerciasis (B73.02)
- glaucoma (in) syphilis (A52.71)
- glaucoma (in) tuberculous (A18.59)
- neovascular secondary angle closure glaucoma (H40.84-)
Coding Notes
Code First
- underlying condition, such as:
- amyloidosis (E85.-)
- aniridia (Q13.1)
- glaucoma (in) diabetes mellitus (E08.39, E09.39, E10.39, E11.39, E13.39)
- Lowe's syndrome (E72.03)
- Rieger anomaly (Q13.81)
- specified metabolic disorder (E70-E88)
Medicare LCD Coverage for H42
Local Coverage Determinations (LCDs) from CMS MACs that list H42 as a covered diagnosis.
Showing top 10 of 44 total . Click a CPT for full coverage scope.
Commercial Payer Coverage
Coverage policies from major commercial payers referencing H42.
5 Medicare
CPT Codes Commonly Billed with H42
Procedures frequently paired with this diagnosis based on PayerReady's Dx↔Px linkage data.
We don't have CPT pairings indexed for this specific code yet. Use the CPT search above to find common procedures, or check your payer's published medical policy for code-specific guidance.
Convert H42 to ICD-9-CM
Per CMS General Equivalence Mappings (GEMs), useful for legacy data review and historical claim analysis.
| ICD-10 | ICD-9 | Mapping Flags |
|---|---|---|
| H42 | 36544 | 10000 |
Flags format (5 digits): Approximate · No Map · Combination · Scenario · Choice List. Source: CMS 2017 GEMs (final version).
Codes Adjacent To H42
Other codes in section H40-H42 (Glaucoma).
ICD-10 H42, Billing FAQ
Is ICD-10 code H42 billable? +
Yes, H42 is a billable ICD-10-CM code that can appear as a primary or secondary diagnosis on claims.
What codes are Type 1 Excludes for H42? +
Type 1 Excludes (never code together with H42): glaucoma (in) onchocerciasis (B73.02); glaucoma (in) syphilis (A52.71); glaucoma (in) tuberculous (A18.59)
What ICD-9 codes does H42 map to? +
Per CMS GEMs, H42 maps to ICD-9 codes: 36544. Useful for legacy data review and historical claim analysis.
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Reviewed by the PayerReady Medical Coding Team
Verified against the CMS 2026 code set on June 1, 2026.
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