ICD-10-CM 2027
ICD-10 code for iris edema
From the official ICD-10-CM alphabetic index entry “Edema, edematous (infectious) (pitting) (toxic) › iris”. Page updated September 29, 2026.
About coding iris edema
The ICD-10-CM code for iris edema is H21.89 (Other specified disorders of iris and ciliary body).
Within H21.8, choose H21.89 (Other specified disorders of iris and ciliary body) only when documentation doesn't support a more specific option: Floppy iris syndrome (H21.81) and Plateau iris syndrome (post-iridectomy) (postprocedural) (H21.82).
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.
Common questions about iris edema ICD-10 codes
What is the ICD-10 code for iris edema?
- H21.89 — Other specified disorders of iris and ciliary body.
Is H21.89 billable?
- Yes. H21.89 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can H21.89 be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict H21.89 as a principal diagnosis.
Is H21.89 a CC or MCC?
- No. H21.89 is neither a CC nor an MCC under MS-DRG v44.0.