ICD-10 code for iris disorder

The ICD-10-CM code for iris disorder is H21.9 (Unspecified disorder of iris and ciliary body). The official index lists 3 more specific codes, so check the documentation for details such as type, cause, site or severity before settling on H21.9.

Within H21, choose H21.9 (Unspecified disorder of iris and ciliary body) only when documentation doesn't support a more specific option: Hyphema (H21.0), other vascular disorders of iris and ciliary body (H21.1), degeneration of iris and ciliary body (H21.2), cyst of iris, ciliary body and anterior chamber (H21.3), pupillary membranes (H21.4), other and unspecified adhesions and disruptions of iris and ciliary body (H21.5) and other specified disorders of iris and ciliary body (H21.8).

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.