H21.339 Parasitic cyst of iris, ciliary body or anterior chamber, unspecified eye

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

Applies from H21 Other disorders of iris and ciliary body

Excludes2 (not included here)

• sympathetic uveitis (H44.1-)

Applies from H21.3 Cyst of iris, ciliary body and anterior chamber

Excludes2 (not included here)

• miotic pupillary cyst (H21.27-)

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.

Nearby codes

• H21.329 Implantation cysts of iris, ciliary body or anterior chamber, unspecified eye
• H21.33 Parasitic cyst of iris, ciliary body or anterior chamber
• H21.331 Parasitic cyst of iris, ciliary body or anterior chamber, right eye
• H21.332 Parasitic cyst of iris, ciliary body or anterior chamber, left eye
• H21.333 Parasitic cyst of iris, ciliary body or anterior chamber, bilateral
• H21.339 Parasitic cyst of iris, ciliary body or anterior chamber, unspecified eye (this code)
• H21.34 Primary cyst of pars plana
• H21.341 Primary cyst of pars plana, right eye
• H21.342 Primary cyst of pars plana, left eye
• H21.343 Primary cyst of pars plana, bilateral
• H21.349 Primary cyst of pars plana, unspecified eye