H42
BillableGlaucoma in diseases classified elsewhere
HCC Category Mapping
RxHCCHCC 244 — Glaucoma, Other
0.000What This Code Means
Glaucoma that develops as a result of another disease or condition affecting the eye.
Coding Tips
- •This code requires a secondary diagnosis code for the underlying disease causing the glaucoma
- •Common underlying conditions include diabetes, inflammation, or vascular disorders; ensure both conditions are coded
Clinical Significance
This manifestation code identifies glaucoma occurring secondary to systemic or other classified diseases, such as diabetes mellitus, amyloidosis, Lowe syndrome, or other metabolic disorders. As a manifestation code, H42 must always be sequenced after the underlying disease code. Capturing this relationship is important for understanding the full clinical picture and comorbidity burden of the patient.
Documentation Requirements
- ✓Documented diagnosis of glaucoma as a manifestation of an underlying systemic disease
- ✓Identification and documentation of the underlying disease (e.g., diabetes, amyloidosis, Lowe syndrome)
- ✓Confirmation that glaucoma is causally related to the underlying condition
- ✓Intraocular pressure measurement
- ✓Optic nerve evaluation
- ✓Code the underlying disease first, then H42 as the manifestation code
Excludes 1 — Do NOT code together
Code First
Commonly Confused Codes
H40.40-H40.43 — Glaucoma secondary to eye inflammation (use for uveitic glaucoma, not systemic disease)H40.50-H40.53 — Glaucoma secondary to other eye diseases (use for other ocular conditions causing glaucoma)H40.60-H40.63 — Glaucoma secondary to drugs (use when medication is the cause)H40.89 — Other specified glaucoma (use when glaucoma type is specified but not secondary to a classified disease)E11.39 — Type 2 diabetes with other diabetic ophthalmic complication (the underlying code that would pair with H42)
Code Hierarchy
└H42Glaucoma in diseases classified elsewhere
└H42Glaucoma in diseases classified elsewhere