2026 ICD-10-CM Diagnosis Code H21.332Parasitic cyst of iris, ciliary body or anterior chamber, left eye

ICD-10-CM Codes›H00–H59›H15-H22›H21

ICD-10-CM H21.332
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

H21.332 is a billable ICD-10-CM diagnosis code for parasitic cyst of iris, ciliary body or anterior chamber, left eye. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026) and groups to MS-DRG 121 through 122. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Other specified eye disorders.

Code Identity

ICD-10-CM Code
H21.332
Billable Status
Yes — Valid for Submission
Code Describes
Parasitic cyst of iris, ciliary body or anterior chamber, left eye
Short Description
Parastc cyst of iris, ciliary body or ant chamber, left eye
Parent Code
H21.33
Parasitic cyst of iris, ciliary body or anterior chamber

Code Classification

ChapterH00–H59Diseases of the eye and adnexa
SectionH15-H22Disorders of sclera, cornea, iris and ciliary body
CategoryH21Other disorders of iris and ciliary body
This CodeH21.332Parasitic cyst of iris, ciliary body or anterior chamber, left eye

Clinical ClassificationClinical

AHRQ’s CCSR groups this code into broader clinical categories.

CCSR EYE012
Other specified eye disorders
Default principal diagnosis: inpatient Yes · outpatient Yes

Patient EducationClinical

Eye Diseases

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Read the full article at MedlinePlus

Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.

Convert H21.332 to ICD-9-CMHistory

The closest ICD-9-CM equivalents under the General Equivalence Mappings.

ICD-9-CM
360.13 Parasitic endophthal NOS
Approximate The match is approximate rather than exact.

Code HistoryHistory

FY 2016AddedAdded to the ICD-10-CM code setEffective October 1, 2015, the first year of ICD-10-CM.
FY 2017–2025No changes
FY 2026CurrentCurrent code set, no changesEffective October 1, 2025 through September 30, 2026.

Questions About H21.332Overview

Is H21.332 (Parasitic cyst of iris, ciliary body or anterior chamber) a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report parasitic cyst of iris, ciliary body or anterior chamber, left eye on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

What MS-DRG does H21.332 group to?

When parasitic cyst of iris, ciliary body or anterior chamber, left eye is the principal diagnosis on an inpatient stay, it groups to MS-DRG 121, 122, with relative weights from 0.7858 to 1.1633 depending on complications. Higher weights mean higher Medicare reimbursement.

What is the ICD-9 equivalent of H21.332?

Under the General Equivalence Mappings, parasitic cyst of iris, ciliary body or anterior chamber, left eye converts to ICD-9-CM 360.13 (parasitic endophthal NOS). The mapping is approximate, so confirm the match fits the documentation.

Footnotes

[1] Not chronic - A diagnosis code that does not fit the criteria for chronic condition (duration, ongoing medical treatment, and limitations) is considered not chronic. Some codes designated as not chronic are acute conditions. Other diagnosis codes that indicate a possible chronic condition, but for which the duration of the illness is not specified in the code description (i.e., we do not know the condition has lasted 12 months or longer) also are considered not chronic.