H33.121 Parasitic cyst of retina, right eye

Billable ICD-10-CM code, FY2026. Acts as a Complication or Comorbidity (CC) as a secondary diagnosis.

Applies from H33 Retinal detachments and breaks

Excludes1 (never code together)

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

Applies from H33.1 Retinoschisis and retinal cysts

Excludes1 (never code together)

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

MS-DRG index

Defines the logic of DRG(s) 121-122 in MDC 02.

Approximate ICD-9-CM (GEMs)

• 360.13 Parasitic endophthalmitis NOS (approximate)

Code annotations containing back-references to H33.121

Back-references to H33

• Use Additional: H44.2C Degenerative myopia with retinal detachment ("code to identify the retinal detachment (H33.-)")

Nearby codes

• H33.111 Cyst of ora serrata, right eye
• H33.112 Cyst of ora serrata, left eye
• H33.113 Cyst of ora serrata, bilateral
• H33.119 Cyst of ora serrata, unspecified eye
• H33.12 Parasitic cyst of retina
• H33.121 Parasitic cyst of retina, right eye (this code)
• H33.122 Parasitic cyst of retina, left eye
• H33.123 Parasitic cyst of retina, bilateral
• H33.129 Parasitic cyst of retina, unspecified eye
• H33.19 Other retinoschisis and retinal cysts
• H33.191 Other retinoschisis and retinal cysts, right eye