2026 ICD-10-CM Diagnosis Code H33.193Other retinoschisis and retinal cysts, bilateral

ICD-10-CM Codes›H00–H59›H30-H36›H33

ICD-10-CM H33.193
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

H33.193 is a billable ICD-10-CM diagnosis code for other retinoschisis and retinal cysts, bilateral. 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. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Retinal and vitreous conditions.

Code Identity

ICD-10-CM Code
H33.193
Billable Status
Yes — Valid for Submission
Code Describes
Other retinoschisis and retinal cysts, bilateral
Short Description
Other retinoschisis and retinal cysts, bilateral
Same as the full description in the CMS dataset.
Parent Code
H33.19
Other retinoschisis and retinal cysts

Code Classification

ChapterH00–H59Diseases of the eye and adnexa
SectionH30-H36Disorders of choroid and retina
CategoryH33Retinal detachments and breaks
This CodeH33.193Other retinoschisis and retinal cysts, bilateral

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Bilateral flat retinoschisis
  • Bilateral primary cyst of retinas
  • Bilateral retinal pseudocyst
  • Bilateral schisis of retinas
  • Flat retinoschisis
  • Flat retinoschisis of left eye
  • Flat retinoschisis of right eye
  • Left retinal pseudocyst
  • Primary cyst of left retina
  • Primary cyst of right retina
  • Primary retinal cyst
  • Pseudocyst of retina
  • Right retinal pseudocyst
  • Schisis of left retina
  • Schisis of right retina

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

Patient EducationClinical

Retinal Disorders

The retina is a layer of tissue in the back of your eye that senses light and sends images to your brain. In the center of this nerve tissue is the macula. It provides the sharp, central vision needed for reading, driving and seeing fine detail.

Read the full article at MedlinePlus

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

Convert H33.193 to ICD-9-CMHistory

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

ICD-9-CM
361.19 Retinoshisis or cyst NEC
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 H33.193Overview

Is H33.193 (Other retinoschisis and retinal cysts) a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report other retinoschisis and retinal cysts, bilateral on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

What MS-DRG does H33.193 group to?

When other retinoschisis and retinal cysts, bilateral 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 H33.193?

Under the General Equivalence Mappings, other retinoschisis and retinal cysts, bilateral converts to ICD-9-CM 361.19 (retinoshisis or cyst NEC). 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.