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ICD-10 Code H21.3: Cyst of iris, ciliary body and anterior chamber

H21.3 is an ICD-10 diagnosis entry used to group records related to Cyst of iris, ciliary body and anterior chamber. You may see this entry in coding references, medical records, or claims workflows when a broader diagnosis category is being reviewed before a more specific code is chosen. ICD-10 entries help standardize how diagnoses are organized for coding, reporting, analytics, and documentation. This code sits within the broader ICD-10 area for Diseases of the eye and adnexa (H00-H59).

What is this code?

ICD-10 entries help standardize how diagnoses are organized for coding, reporting, analytics, and documentation. This code sits within the broader ICD-10 area for Diseases of the eye and adnexa (H00-H59).

When is it used?

  • May be used when a clinician documents cyst of iris, ciliary body and anterior chamber in a patient's medical record.
  • May appear in hospital records, claims, referrals, and clinical documentation.
  • This code may act more like a grouping or parent code, so a more specific child code may be used in final documentation when available.

What it does not mean

  • A code alone does not explain severity, treatment plan, or outcome.
  • A medical code should not be treated as a substitute for a doctor's diagnosis or advice.
  • This entry may represent a broader category rather than the most specific billable code.

Code hierarchy

chapter
7Diseases of the eye and adnexa (H00-H59)
block
H15-H22Disorders of sclera, cornea, iris and ciliary body
category
H21Other disorders of iris and ciliary body
currentH21

Official coding notes

Excludes2 (may code together if documented)
  • miotic pupillary cyst (H21.27-)

Where you may see this code

You may see this entry in coding references, medical records, or claims workflows when a broader diagnosis category is being reviewed before a more specific code is chosen.

Related specialists

Ophthalmologist

Coding guidelines

Compatibility

Legacy code aligns to an official FY 2026 category. Frontend should resolve to the official category page and surface the billable child codes.
Legacy codes
H21.3

Common synonyms

Cyst of iris, ciliary body and anterior chamber

Frequently asked questions

Code details

CodeH21.3
SystemICD10
Display nameCyst of iris, ciliary body and anterior chamber
ChapterDiseases of the eye and adnexa (H00-H59)
BlockDisorders of sclera, cornea, iris and ciliary body

Flags

BillableNo
Valid clinical useNo

Source

SourceICD-10
Version2026-annual
Releaseannual
Year2026

About this content

This page is prepared by HealthAssure's clinical team using official coding standards from ICD-10. AI tools assist with drafting explanations, which are then reviewed and verified by healthcare professionals for accuracy. This content is for informational purposes and does not replace professional medical advice. Meet our team.