2026 ICD-10-CM Diagnosis Code H33.312Horseshoe tear of retina without detachment, left eye

ICD-10-CM Codes›H00–H59›H30-H36›H33

ICD-10-CM H33.312
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

H33.312 is a billable ICD-10-CM diagnosis code for horseshoe tear of retina without detachment, left 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. Coders also document this condition as horseshoe retinal tear without detachment. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Retinal and vitreous conditions.

Code Identity

ICD-10-CM Code
H33.312
Billable Status
Yes — Valid for Submission
Code Describes
Horseshoe tear of retina without detachment, left eye
Short Description
Horseshoe tear of retina without detachment, left eye
Same as the full description in the CMS dataset.
Parent Code
H33.31
Horseshoe tear of retina without detachment

Code Classification

ChapterH00–H59Diseases of the eye and adnexa
SectionH30-H36Disorders of choroid and retina
CategoryH33Retinal detachments and breaks
This CodeH33.312Horseshoe tear of retina without detachment, left eye

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Horseshoe retinal tear without detachment
  • Horseshoe tear of retina of left eye without detachment
  • Retinal tear of left eye
  • Retinal tear of left eye without detachment
  • Retinal tear without 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

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 H33.312 to ICD-9-CMHistory

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

ICD-9-CM
361.32 Horseshoe tear of retina
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 H33.312Overview

Is H33.312 (Horseshoe tear of retina without detachment) a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report horseshoe tear of retina without detachment, left eye on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

What MS-DRG does H33.312 group to?

When horseshoe tear of retina without detachment, left 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 H33.312?

Under the General Equivalence Mappings, horseshoe tear of retina without detachment, left eye converts to ICD-9-CM 361.32 (horseshoe tear of retina). 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.