H33.1 – Retinoschisis and retinal cysts

ICD-10-CM 2027 diagnosis code · Disorders of choroid and retina

Non-billable header

ICD-10-CM code H33.1

Code: H33.1 (claims format: H331)
Description: Retinoschisis and retinal cysts
Billable: No – use a more specific code below
Valid for: Dates of service October 1, 2026 – September 30, 2027 (FY2027)
Chapter: 7. Diseases of the eye and adnexa (H00-H59)
Block: H30-H36 Disorders of choroid and retina
Parent codes: H33

Billable codes under H33.1

H33.1 is a header code and cannot be used on claims. Choose the most specific code:

H33.10 – Unspecified retinoschisisHeader (more codes below)
H33.11 – Cyst of ora serrataHeader (more codes below)
H33.12 – Parasitic cyst of retinaHeader (more codes below)
H33.19 – Other retinoschisis and retinal cystsHeader (more codes below)

Notes for H33.1

Excludes1 (not coded here):

congenital retinoschisis (Q14.1)
microcystoid degeneration of retina (H35.42-)

Notes inherited from parent codes

Instructional notes at a category or block level apply to every code below it.

H33 – Retinal detachments and breaks

Excludes1 (not coded here):

detachment of retinal pigment epithelium (H35.72-, H35.73-)

Related codes in H33

H33.0 – Retinal detachment with retinal breakHeader
H33.2 – Serous retinal detachmentHeader
H33.3 – Retinal breaks without detachmentHeader
H33.4 – Traction detachment of retinaHeader
H33.8 – Other retinal detachmentsBillable

Frequently asked questions

What is ICD-10 code H33.1?

H33.1 is the ICD-10-CM code for retinoschisis and retinal cysts, in the block H30-H36 (Disorders of choroid and retina).

Is H33.1 a billable code?

No. H33.1 is a header code with more specific child codes; report one of the billable codes listed above.

What category does H33.1 belong to?

It belongs to category H33 – Retinal detachments and breaks.

Source: CDC/NCHS ICD-10-CM FY2027 code files, tabular list and index. Reference only – code assignment must follow the official ICD-10-CM guidelines and documentation in the medical record.