H33.1 vs H35.42
H33.1 (Retinoschisis and retinal cysts) compared with H35.42 (Microcystoid degeneration of retina), from the official CMS tabular data. Do not report these codes together: the official tabular list marks them Excludes1.
Can these codes be reported together?
No — do not report together. H33.1 carries an Excludes1 note covering H35.42: “microcystoid degeneration of retina (H35.42-)”
Sole exception: when the two conditions are documented as unrelated to each other (ICD-10-CM Official Guidelines, Section I.A.12.a).
Side by side
| H33.1Retinoschisis and retinal cysts | H35.42Microcystoid degeneration of retina | |
|---|---|---|
| Billing status | Non-billable header | Non-billable header |
| Classification | H00-H59 — Diseases of the Eye and Adnexa (H00-H59) | H00-H59 — Diseases of the Eye and Adnexa (H00-H59) |
| Definition | Retinoschisis and retinal cysts is a non-billable ICD-10-CM category code (H33.1). | Microcystoid degeneration of retina is a non-billable ICD-10-CM category code (H35.42). |
Derived from the official CMS ICD-10-CM tabular data (FY2026). Not billing advice; verify sequencing rules for the encounter. All data sources