H40.42
⚠ Non-billable (Header)Glaucoma secondary to eye inflammation, left eye
Diseases of the eye and adnexa (H00-H59)
⚠️ This is a category header code — not billable. Use a more specific child code below.
✅ No additional coding notes for H40.42
Child Codes (5)
H40.42X0Glaucoma secondary to eye inflammation, left eye, stage unspecifiedH40.42X1Glaucoma secondary to eye inflammation, left eye, mild stageH40.42X2Glaucoma secondary to eye inflammation, left eye, moderate stageH40.42X3Glaucoma secondary to eye inflammation, left eye, severe stageH40.42X4Glaucoma secondary to eye inflammation, left eye, indeterminate stage
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CodeH40.42
BillableNo — Header code
ParentH40.4
CategoryDiseases of the eye and adnexa (H00-H59)
Excludes10 rule(s)
Excludes20 note(s)
Child codes5
Data Source
CMS ICD-10-CM 2026 Tabular List
Updated October 1, 2025 (FY2026)