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H21.331

H21.331: Parasitic cyst of iris, ciliary body or anterior chamber, right eye

Billable / specific codeICD-10-CMright

H21.331 is a billable, specific ICD-10-CM code for parasitic cyst of iris, ciliary body or anterior chamber, right eye. It is valid for submission on a claim.

Check H21.331 with the rest of the claim: free scrubber

Excludes2 inherited from the categories above H21.331

Not part of this code, but both may be coded when both are present.

Written on H21.3: Cyst of iris, ciliary body and anterior chamber

  • miotic pupillary cyst (H21.27-)

Written on H21: Other disorders of iris and ciliary body

  • sympathetic uveitis (H44.1-)

Risk adjustment

No CMS-HCC V28 category: this code does not change a RAF score.

Medicare coverage

H21.331 is named in 7 Medicare coverage policies: 7 listing it as supporting medical necessity. Which one applies depends on your Medicare contractor.

  • A53060Billing and Coding: Ophthalmology: Extended Ophthalmoscopy and Fundus Photography
  • A56726Billing and Coding: Ophthalmology: Posterior Segment Imaging (Extended Ophthalmoscopy and Fundus Photography)
  • A56729Billing and Coding: Magnetic Resonance Imaging of the Head and Neck
  • A57068Billing and Coding: Ocular Photography - External

Code history

Unchanged in every release from FY2024 to FY2027.

Other codes under H21.33

ICD-10-CMFY2027· effective October 1, 2026

Loaded directly from the CMS/NCHS ICD-10-CM public-domain release: see data sources and our editorial policy. If this page disagrees with the CMS tabular list, this page is wrong. Reference information for professional coders; not medical or billing advice.