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ICD-10-CM 2027 diagnosis code

H20.9Unspecified iridocyclitis

✓ Billable / specificCC — complication/comorbidity

H20.9 is a valid, billable ICD-10-CM code for unspecified iridocyclitis. It can be reported on claims for dates of service from October 1, 2026 – September 30, 2027.

Looking up by condition? See ICD-10 code for Cyclitis, ICD-10 code for Iridocyclitis.

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 H20.9

H20.9 is the ICD-10-CM diagnosis code for unspecified iridocyclitis. It belongs to category H20 (iridocyclitis), block H15-H22 (disorders of sclera, cornea, iris and ciliary body) 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 H20, choose H20.9 (Unspecified iridocyclitis) only when documentation doesn't support a more specific option: acute and subacute iridocyclitis (H20.0), chronic iridocyclitis (H20.1), Lens-induced iridocyclitis (H20.2) and other iridocyclitis (H20.8).

As a secondary diagnosis it is a CC (complication or comorbidity), which can move an inpatient stay into the "with CC" MS-DRG of its family, unless the principal diagnosis excludes it.

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 364.3 (unspecified iridocyclitis).

Coding notes

Applicable toConditions and synonyms classified to this code
  • Uveitis NOS

Notes that apply from higher levels

Instructions written at a parent level also apply to H20.9.

Broader instructions also apply from Chapter 7: Diseases of the eye and adnexa.

Alphabetic index entries

2 entries

Terms in the official ICD-10-CM index that lead to H20.9.

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 →
  • 364.3Unspecified iridocyclitisapproximate

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 H20.9

Is H20.9 billable?

Yes. H20.9 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).

Can H20.9 be used as a principal diagnosis?

Yes. The Medicare Code Editor doesn't restrict H20.9 as a principal diagnosis.

Is H20.9 a CC or MCC?

H20.9 is a CC (complication or comorbidity) under MS-DRG v44.0, unless excluded by the principal diagnosis.

What DRG does H20.9 group to?

H20.9 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 H20.9?

The CMS General Equivalence Mappings map H20.9 to ICD-9-CM 364.3.