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ICD-10-CM 2027 diagnosis code

H05.321Deformity of right orbit due to bone disease

✓ Billable / specific

H05.321 is a valid, billable ICD-10-CM code for deformity of right orbit due to bone disease. 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 H05.321

H05.321 is the ICD-10-CM diagnosis code for deformity of right orbit due to bone disease. It belongs to category H05 (disorders of orbit), block H00-H05 (disorders of eyelid, lacrimal system and orbit) 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 H05.32 (deformity of orbit due to bone disease), H05.321 is specifically for deformity of right orbit due to bone disease. Related codes cover left orbit due to bone disease (H05.322), bilateral orbits due to bone disease (H05.323) and unspecified orbit due to bone disease (H05.329).

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 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 376.43 (local deformities of orbit due to bone disease).

Notes that apply from higher levels

Instructions written at a parent level also apply to H05.321.

› From H05.32 Deformity of orbit due to bone disease
Code also
  • associated bone disease
› From H05.3 Deformity of orbit
Excludes1
  • congenital deformity of orbit (Q10.7)
  • hypertelorism (Q75.2)
› From H05 Disorders of orbit
Excludes1
  • congenital malformation of orbit (Q10.7)

Broader instructions also apply from H00-H05 Disorders of eyelid, lacrimal system and orbit and 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.

ICD-9-CM equivalent

Converter →
  • 376.43Local deformities of orbit due to bone diseaseapproximate

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 H05.321

Is H05.321 billable?

Yes. H05.321 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).

Can H05.321 be used as a principal diagnosis?

Yes. The Medicare Code Editor doesn't restrict H05.321 as a principal diagnosis.

Is H05.321 a CC or MCC?

No. H05.321 is neither a CC nor an MCC under MS-DRG v44.0.

What DRG does H05.321 group to?

H05.321 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 H05.321?

The CMS General Equivalence Mappings map H05.321 to ICD-9-CM 376.43.