ICD-10-CM 2027 diagnosis code
H33.331Multiple defects of retina without detachment, right eye
H33.331 is a valid, billable ICD-10-CM code for multiple defects of retina without detachment, right eye. It can be reported on claims for dates of service from October 1, 2026 – September 30, 2027.
Code unchanged since ICD-10-CM took effect on October 1, 2015. Source: official FY2027 ICD-10-CM release from CDC/NCHS and CMS. Page updated September 29, 2026. About our data
About H33.331
H33.331 is the ICD-10-CM diagnosis code for multiple defects of retina without detachment, right eye. It belongs to category H33 (retinal detachments and breaks), block H30-H36 (disorders of choroid and retina) and chapter 7 (diseases of the eye and adnexa). It is billable, so it can be reported on its own for dates of service from October 1, 2026 through September 30, 2027.
Within H33.33 (multiple defects of retina without detachment), H33.331 is specifically for multiple defects of retina without detachment, right eye. Related codes cover left eye (H33.332), bilateral (H33.333) and unspecified eye (H33.339).
It is not a CC or MCC, so as a secondary diagnosis it doesn't change the MS-DRG severity level.
In MS-DRG v44.0, it is part of the grouping logic for DRG 124 (Other Disorders of the Eye with MCC or Thrombolytic Agent, relative weight 1.2471) and DRG 125 (Other Disorders of the Eye without MCC, relative weight 0.7702), in MDC 02 (Diseases and Disorders of the Eye), as a principal or secondary diagnosis. The DRG a claim lands in depends on the principal diagnosis, procedures and any CC/MCC secondary diagnoses.
It has been part of ICD-10-CM since the code set took effect on October 1, 2015 and hasn't changed since.
Before ICD-10, this condition was coded in ICD-9-CM as 361.33 (multiple defects of retina without detachment).
Notes that apply from higher levels
Instructions written at a parent level also apply to H33.331.
Broader instructions also apply from Chapter 7: Diseases of the eye and adnexa.
MS-DRG v44.0 grouping
All DRGs →Inpatient MS-DRGs this diagnosis can group to, as the principal or a secondary diagnosis, depending on the rest of the claim.
MDC 02 · Diseases and Disorders of the Eye
ICD-9-CM equivalent
Converter →- 361.33Multiple defects of retina without detachmentapproximate
From the CMS 2018 General Equivalence Mappings (GEMs), the final GEMs release.
Code history
- 2016
- 2017
- 2018
- 2019
- 2020
- 2021
- 2022
- 2023
- 2024
- 2025
- 2026
- 2027
- FY2016 (effective 10/1/2015): Added (first year of ICD-10-CM)
- No changes since FY2016.
Common questions about H33.331
Is H33.331 billable?
- Yes. H33.331 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can H33.331 be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict H33.331 as a principal diagnosis.
Is H33.331 a CC or MCC?
- No. H33.331 is neither a CC nor an MCC under MS-DRG v44.0.
What DRG does H33.331 group to?
- H33.331 is used in the MS-DRG v44.0 logic for MS-DRG 124 (Other Disorders of the Eye with MCC or Thrombolytic Agent) and MS-DRG 125 (Other Disorders of the Eye without MCC). Which one applies depends on whether it is the principal diagnosis and on the rest of the claim.
What is the ICD-9 code for H33.331?
- The CMS General Equivalence Mappings map H33.331 to ICD-9-CM 361.33.