2026 ICD-10-CM Diagnosis Code H20.029Recurrent acute iridocyclitis, unspecified eye

ICD-10-CM Codes›H00–H59›H15-H22›H20

ICD-10-CM H20.029
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

H20.029 is a billable ICD-10-CM diagnosis code for recurrent acute iridocyclitis, unspecified eye. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026) and groups to MS-DRG 124 through 125. The code is flagged as an unspecified code, since codes identifying laterality exist in the same family. Coders also document this condition as recurrent acute anterior uveitis. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Uveitis and ocular inflammation.

Code Identity

ICD-10-CM Code
H20.029
Billable Status
Yes — Valid for Submission
Code Describes
Recurrent acute iridocyclitis, unspecified eye
Short Description
Recurrent acute iridocyclitis, unspecified eye
Same as the full description in the CMS dataset.
Parent Code
H20.02
Recurrent acute iridocyclitis

Code Classification

ChapterH00–H59Diseases of the eye and adnexa
SectionH15-H22Disorders of sclera, cornea, iris and ciliary body
CategoryH20Iridocyclitis
This CodeH20.029Recurrent acute iridocyclitis, unspecified eye

Code EditsBilling

Medicare Code Editor checks that affect claim validity for H20.029.

Unspecified codes
Unspecified codes exist in the ICD-10-CM classification for circumstances when documentation in the medical record does not provide the level of detail needed to support reporting a more specific code. However, in the inpatient setting, there should generally be very limited and rare circumstances for which the laterality (right, left, bilateral) of a condition is unable to be documented and reported. The following pages contain the list of unspecified ICD-10-CM diagnosis codes for which there is a more specific code to identify laterality (right, left, bilateral) within that code family.

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Recurrent acute anterior uveitis
  • Recurrent anterior uveitis
  • Recurrent iritis

Clinical ClassificationClinical

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

CCSR EYE004
Uveitis and ocular inflammation
Default principal diagnosis: inpatient Yes · outpatient Yes

Patient EducationClinical

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Read the full article at MedlinePlus

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Convert H20.029 to ICD-9-CMHistory

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

ICD-9-CM
364.02 Recurrent iridocyclitis
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 H20.029Overview

Is H20.029 (Recurrent acute iridocyclitis) a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report recurrent acute iridocyclitis, unspecified eye on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

What MS-DRG does H20.029 group to?

When recurrent acute iridocyclitis, unspecified eye is the principal diagnosis on an inpatient stay, it groups to MS-DRG 124, 125, with relative weights from 0.7678 to 1.3231 depending on complications. Higher weights mean higher Medicare reimbursement.

What is the ICD-9 equivalent of H20.029?

Under the General Equivalence Mappings, recurrent acute iridocyclitis, unspecified eye converts to ICD-9-CM 364.02 (recurrent iridocyclitis). 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.