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ICD-10-CM 2027 diagnosis code

H05.839Thyroid orbitopathy, unspecified orbit

✓ Billable / specific

H05.839 is a valid, billable ICD-10-CM code for thyroid orbitopathy, unspecified orbit. It can be reported on claims for dates of service from October 1, 2026 – September 30, 2027.

Code last changed in FY2026 (effective October 1, 2025). Source: official FY2027 ICD-10-CM release from CDC/NCHS and CMS. Page updated September 29, 2026. About our data

About H05.839

H05.839 is the ICD-10-CM diagnosis code for thyroid orbitopathy, unspecified orbit. 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 H05.83, choose H05.839 (unspecified orbit) only when documentation doesn't support a more specific option: right orbit (H05.831), left orbit (H05.832) and bilateral (H05.833).

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 was added in FY2026, effective October 1, 2025.

Notes that apply from higher levels

Instructions written at a parent level also apply to H05.839.

› From H05.83 Thyroid orbitopathy
Code also
  • , if applicable, any associated conditions such as:
  • autoimmune thyroiditis (E06.3)
  • thyrotoxicosis with diffuse goiter (E05.0-)
› 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.

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
  • FY2026 (effective 10/1/2025): Added
  • No changes since FY2026.

Common questions about H05.839

Is H05.839 billable?

Yes. H05.839 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).

Can H05.839 be used as a principal diagnosis?

Yes. The Medicare Code Editor doesn't restrict H05.839 as a principal diagnosis.

Is H05.839 a CC or MCC?

No. H05.839 is neither a CC nor an MCC under MS-DRG v44.0.

What DRG does H05.839 group to?

H05.839 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.