2026 ICD-10-CM Diagnosis Code H33.20Serous retinal detachment, unspecified eye

ICD-10-CM Codes›H00–H59›H30-H36›H33

ICD-10-CM H33.20
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

H33.20 is a billable ICD-10-CM diagnosis code for serous retinal detachment, 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. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Retinal and vitreous conditions.

Code Identity

ICD-10-CM Code
H33.20
Billable Status
Yes — Valid for Submission
Code Describes
Serous retinal detachment, unspecified eye
Short Description
Serous retinal detachment, unspecified eye
Same as the full description in the CMS dataset.
Parent Code
H33.2
Serous retinal detachment

Code Classification

ChapterH00–H59Diseases of the eye and adnexa
SectionH30-H36Disorders of choroid and retina
CategoryH33Retinal detachments and breaks
This CodeH33.20Serous retinal detachment, unspecified eye

Code EditsBilling

Medicare Code Editor checks that affect claim validity for H33.20.

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.

  • Glaucoma due to retinal detachment
  • Occipital encephalocele
  • Old retinal detachment
  • Partial retinal detachment
  • Recent retinal detachment
  • Retinal detachment
  • Retinal detachment and occipital encephalocele
  • Retinal detachment without retinal defect
  • Secondary ocular hypertension due to retinal detachment
  • Serous macular detachment
  • Serous retinal detachment

Clinical ClassificationClinical

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

CCSR EYE005
Retinal and vitreous conditions
Default principal diagnosis: inpatient Yes · outpatient Yes

Clinical InformationClinical

  • Retinal Detachment

    separation of the inner layers of the retina (neural retina) from the pigment epithelium. retinal detachment occurs more commonly in men than in women, in eyes with degenerative myopia, in aging and in aphakia. it may occur after an uncomplicated cataract extraction, but it is seen more often if vitreous humor has been lost during surgery. (dorland, 27th ed; newell, ophthalmology: principles and concepts, 7th ed, p310-12).

  • Serous Retinal Detachment

    retinal detachment secondary to fluid accumulation under the neurosensory retina without a retinal tear or break.

Patient EducationClinical

Retinal Detachment

The retina is a layer of tissue in the back of your eye that senses light and sends images to your brain. It provides the sharp, central vision needed for reading, driving, and seeing fine detail. A retinal detachment lifts or pulls the retina from its normal position.

Read the full article at MedlinePlus

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

Convert H33.20 to ICD-9-CMHistory

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

ICD-9-CM
361.2 Serous retina detachment
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 H33.20Overview

Is H33.20 (Serous retinal detachment) a billable code?

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

What MS-DRG does H33.20 group to?

When serous retinal detachment, 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 H33.20?

Under the General Equivalence Mappings, serous retinal detachment, unspecified eye converts to ICD-9-CM 361.2 (serous retina detachment). 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.