H33.129 Parasitic cyst of retina, unspecified 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)

Medicare Code Edits (MCE v43.1 (April 2026))

• Unspecified code (laterality): Unspecified codes for which a more specific code identifying laterality (right, left, bilateral) exists within the same code family.

Code annotations containing back-references to H33.129

Back-references to H33

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

Nearby codes

• H33.119 Cyst of ora serrata, unspecified eye
• H33.12 Parasitic cyst of retina
• H33.121 Parasitic cyst of retina, right eye
• H33.122 Parasitic cyst of retina, left eye
• H33.123 Parasitic cyst of retina, bilateral
• H33.129 Parasitic cyst of retina, unspecified eye (this code)
• H33.19 Other retinoschisis and retinal cysts
• H33.191 Other retinoschisis and retinal cysts, right eye
• H33.192 Other retinoschisis and retinal cysts, left eye
• H33.193 Other retinoschisis and retinal cysts, bilateral
• H33.199 Other retinoschisis and retinal cysts, unspecified eye