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ICD-10-CM 2027 diagnosis code

H47.321Drusen of optic disc, right eye

✓ Billable / specific

H47.321 is a valid, billable ICD-10-CM code for drusen of optic disc, 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 H47.321

H47.321 is the ICD-10-CM diagnosis code for Drusen of optic disc, right eye. It belongs to category H47 (other disorders of optic [2nd] nerve and visual pathways), block H46-H47 (disorders of optic nerve and visual pathways) 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 H47.32 (Drusen of optic disc), H47.321 is specifically for Drusen of optic disc, right eye. Related codes cover left eye (H47.322), bilateral (H47.323) and unspecified eye (H47.329).

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 123 (Neurological Eye Disorders, relative weight 0.822), 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 377.21 (Drusen of optic disc).

Notes that apply from higher levels

Instructions written at a parent level also apply to H47.321.

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 →
  • 377.21Drusen of optic discapproximate

From the CMS 2018 General Equivalence Mappings (GEMs), the final GEMs release.

Code history

  1. 2016
  2. 2017
  3. 2018
  4. 2019
  5. 2020
  6. 2021
  7. 2022
  8. 2023
  9. 2024
  10. 2025
  11. 2026
  12. 2027
  • FY2016 (effective 10/1/2015): Added (first year of ICD-10-CM)
  • No changes since FY2016.

Common questions about H47.321

Is H47.321 billable?

Yes. H47.321 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).

Can H47.321 be used as a principal diagnosis?

Yes. The Medicare Code Editor doesn't restrict H47.321 as a principal diagnosis.

Is H47.321 a CC or MCC?

No. H47.321 is neither a CC nor an MCC under MS-DRG v44.0.

What DRG does H47.321 group to?

H47.321 is used in the MS-DRG v44.0 logic for MS-DRG 123 (Neurological Eye Disorders). 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 H47.321?

The CMS General Equivalence Mappings map H47.321 to ICD-9-CM 377.21.