All ICD10 Codes
H21Not billable, use a more specific code below

Other disorders of iris and ciliary body

In Disorders of sclera, cornea, iris and ciliary body (H15-H22), chapter 7: Diseases of the Eye and Adnexa

97 billable codes under H21: 4 are a CC; none map to an HCC.A CC or MCC (major CC) is a secondary diagnosis that raises the MS-DRG payment.

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Instructional notes

Excludes2: not included here, code separately if applicable

  • sympathetic uveitis (H44.1-)

Official coding guidelines

From the ICD-10-CM Official Guidelines for Coding and Reporting, FY 2027 (CMS and NCHS). Links open the PDF at the right page.

Covers coding glaucoma by type, eye, and stage, including bilateral cases and stage changes, and coding blindness or low vision when the impairment category is undocumented.

Read Section I.C.7 (page 48)

All codes under H21

H21 can't be used on a claim. Pick a billable code below; grey headings group them.

H21 MS-DRGs

As the principal diagnosis, the billable codes under H21 group to MS-DRG 124, 125, 121, or 122 (v44.0). Which one applies depends on procedures performed, secondary diagnoses (CC/MCC), and the patient's age and discharge status.

About the condition

Plain-language background from MedlinePlus (National Library of Medicine), not coding guidance.

Eye Diseases

Even if your eyes feel healthy, you could have a problem and not know it. That's why regular eye exams are so important. Refractive errors are the most common type of vision problem that makes it hard to see clearly. But some eye conditions or diseases don't have any symptoms and can lead to a permanent loss of vision.

Read more about eye diseases on MedlinePlus

Code history

Valid since FY2016, when ICD-10-CM took effect on October 1, 2015. No changes since.