2026 ICD-10-CM Diagnosis Code H21Other disorders of iris and ciliary body

ICD-10-CM Codes›H00–H59›H15-H22›H21

ICD-10-CM H21
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

H21 is a non-billable ICD-10-CM category code for other disorders of iris and ciliary body, so it cannot be submitted on claims. Use a more specific code from this category instead, such as H21.00, H21.01, H21.02, and H21.03.

Code Identity

ICD-10-CM Code
H21
Billable Status
No — Non-Billable Category
Code Describes
Other disorders of iris and ciliary body
Chapter
H15-H22
Disorders of sclera, cornea, iris and ciliary body

Code Classification

ChapterH00–H59Diseases of the eye and adnexa
SectionH15-H22Disorders of sclera, cornea, iris and ciliary body
CategoryH21Other disorders of iris and ciliary body
This CodeH21Other disorders of iris and ciliary body

Specific Coding for Other disorders of iris and ciliary bodyOverview

Non-specific codes like H21 require more characters. Use one of these billable codes instead:

  • H21.0 for Hyphema

  • Use H21.00 for Hyphema, unspecified eye

  • Use H21.01 for Hyphema, right eye

  • Use H21.02 for Hyphema, left eye

  • Use H21.03 for Hyphema, bilateral

  • H21.1 for Other vascular disorders of iris and ciliary body

  • H21.1X for Other vascular disorders of iris and ciliary body

  • H21.2 for Degeneration of iris and ciliary body

  • H21.21 for Degeneration of chamber angle

  • H21.22 for Degeneration of ciliary body

  • H21.23 for Degeneration of iris (pigmentary)

  • H21.24 for Degeneration of pupillary margin

  • H21.25 for Iridoschisis

  • H21.26 for Iris atrophy (essential) (progressive)

  • H21.27 for Miotic pupillary cyst

  • Use H21.29 for Other iris atrophy

  • H21.3 for Cyst of iris, ciliary body and anterior chamber

  • H21.30 for Idiopathic cysts of iris, ciliary body or anterior chamber

  • H21.31 for Exudative cysts of iris or anterior chamber

  • H21.32 for Implantation cysts of iris, ciliary body or anterior chamber

  • H21.33 for Parasitic cyst of iris, ciliary body or anterior chamber

  • H21.34 for Primary cyst of pars plana

  • H21.35 for Exudative cyst of pars plana

  • H21.4 for Pupillary membranes

  • Use H21.40 for Pupillary membranes, unspecified eye

  • Use H21.41 for Pupillary membranes, right eye

  • Use H21.42 for Pupillary membranes, left eye

  • Use H21.43 for Pupillary membranes, bilateral

  • H21.5 for Other and unspecified adhesions and disruptions of iris and ciliary body

  • H21.50 for Unspecified adhesions of iris

  • H21.51 for Anterior synechiae (iris)

  • H21.52 for Goniosynechiae

  • H21.53 for Iridodialysis

  • H21.54 for Posterior synechiae (iris)

  • H21.55 for Recession of chamber angle

  • H21.56 for Pupillary abnormalities

  • H21.8 for Other specified disorders of iris and ciliary body

  • Use H21.81 for Floppy iris syndrome

  • Use H21.82 for Plateau iris syndrome (post-iridectomy) (postprocedural)

  • Use H21.89 for Other specified disorders of iris and ciliary body

  • Use H21.9 for Unspecified disorder of iris and ciliary body

Tabular List NotesGuidance

Coding notes and annotation back-references applicable to this code.

Type 2 Excludes

  • sympathetic uveitis H44.1

Patient EducationClinical

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.

The full article covers:

  • What diseases can affect the eye?
  • What are the symptoms of eye diseases?
  • Who is more likely to develop eye diseases?
  • What are the treatments for eye diseases?
  • Can eye diseases be prevented?

Read the full article at MedlinePlus

Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.

Code HistoryHistory

FY 2016AddedAdded to the ICD-10-CM code setEffective October 1, 2015, the first year of ICD-10-CM.
FY 2017–2025No changes
FY 2026CurrentCurrent code set, no changesEffective October 1, 2025 through September 30, 2026.

Questions About H21Overview

Is H21 (Other disorders of iris and ciliary body) a billable code?

No. This is a category header that groups the codes for other disorders of iris and ciliary body, and headers cannot be submitted on claims. Claims for other disorders of iris and ciliary body need a more specific code from this category, such as H21.00, H21.01, and H21.02.