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ICD-10-CM 2027 diagnosis code

H10.821Rosacea conjunctivitis, right eye

✓ Billable / specific

H10.821 is a valid, billable ICD-10-CM code for rosacea conjunctivitis, right eye. It can be reported on claims for dates of service from October 1, 2026 – September 30, 2027.

Code last changed in FY2019 (effective October 1, 2018). Source: official FY2027 ICD-10-CM release from CDC/NCHS and CMS. Page updated September 29, 2026. About our data

About H10.821

H10.821 is the ICD-10-CM diagnosis code for rosacea conjunctivitis, right eye. It belongs to category H10 (conjunctivitis), block H10-H11 (disorders of conjunctiva) 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 H10.82 (rosacea conjunctivitis), H10.821 is specifically for rosacea conjunctivitis, right eye. Related codes cover left eye (H10.822), bilateral (H10.823) and unspecified eye (H10.829).

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 FY2019, effective October 1, 2018.

Notes that apply from higher levels

Instructions written at a parent level also apply to H10.821.

› From H10.82 Rosacea conjunctivitis
Code first
  • underlying rosacea dermatitis (L71.-)
› From H10 Conjunctivitis
Excludes1

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.

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
  • FY2019 (effective 10/1/2018): Added
  • No changes since FY2019.

Common questions about H10.821

Is H10.821 billable?

Yes. H10.821 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).

Can H10.821 be used as a principal diagnosis?

Yes. The Medicare Code Editor doesn't restrict H10.821 as a principal diagnosis.

Is H10.821 a CC or MCC?

No. H10.821 is neither a CC nor an MCC under MS-DRG v44.0.

What DRG does H10.821 group to?

H10.821 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.