2027 ICD-10-CM Diagnosis Code H20Iridocyclitis

ICD-10-CM Codes›H00–H59›H15-H22›H20

ICD-10-CM H20
CMSSource: CMS FY 2027 ICD-10-CM dataset · Effective Oct 1, 2026 – Sep 30, 2027

H20 is a non-billable ICD-10-CM category code for iridocyclitis, so it cannot be submitted on claims. Use a more specific code from this category instead, such as H20.00, H20.011, H20.012, and H20.013.

Code Identity

ICD-10-CM Code
H20
Billable Status
No — Non-Billable Category
Code Describes
Iridocyclitis
Short Description
Iridocyclitis
Same as the full description in the CMS dataset.
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
CategoryH20Iridocyclitis
This CodeH20Iridocyclitis

Specific Coding for IridocyclitisOverview

Non-specific codes like H20 require more characters. Use one of these billable codes instead:

  • H20.0 for Acute and subacute iridocyclitis

  • Use H20.00 for Unspecified acute and subacute iridocyclitis

  • H20.01 for Primary iridocyclitis

  • H20.02 for Recurrent acute iridocyclitis

  • H20.03 for Secondary infectious iridocyclitis

  • H20.04 for Secondary noninfectious iridocyclitis

  • H20.05 for Hypopyon

  • H20.1 for Chronic iridocyclitis

  • Use H20.10 for Chronic iridocyclitis, unspecified eye

  • Use H20.11 for Chronic iridocyclitis, right eye

  • Use H20.12 for Chronic iridocyclitis, left eye

  • Use H20.13 for Chronic iridocyclitis, bilateral

  • H20.2 for Lens-induced iridocyclitis

  • Use H20.20 for Lens-induced iridocyclitis, unspecified eye

  • Use H20.21 for Lens-induced iridocyclitis, right eye

  • Use H20.22 for Lens-induced iridocyclitis, left eye

  • Use H20.23 for Lens-induced iridocyclitis, bilateral

  • H20.8 for Other iridocyclitis

  • H20.81 for Fuchs' heterochromic cyclitis

  • H20.82 for Vogt-Koyanagi syndrome

  • Use H20.9 for Unspecified iridocyclitis

Instructional NotesGuidance

Instructions from the official ICD-10-CM Tabular List that apply to H20: its own notes plus those printed at Chapter 7. A note printed at a category, block or chapter applies to every code under it.

Excludes2

Not included here: the excluded condition is not part of this code, but a patient may have both, so both codes may be reported.

From Chapter 7 (H00-H59) Diseases of the eye and adnexa applies to 2,677 codes
  • certain conditions originating in the perinatal period (P04-P96)
  • certain infectious and parasitic diseases (A00-B99)
  • complications of pregnancy, childbirth and the puerperium (O00-O9A)
  • congenital malformations, deformations, and chromosomal abnormalities (Q00-Q99)
  • diabetes mellitus related eye conditions (E09.3-, E10.3-, E11.3-, E13.3-)
  • endocrine, nutritional and metabolic diseases (E00-E88)
  • injury (trauma) of eye and orbit (S05.-)
  • injury, poisoning and certain other consequences of external causes (S00-T88)
  • neoplasms (C00-D49)
  • symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R94)
  • syphilis related eye disorders (A50.01, A50.3-, A51.43, A52.71)

Notes

General instructions on how these codes are used.

From Chapter 7 (H00-H59) Diseases of the eye and adnexa applies to 2,677 codes
  • Use an external cause code following the code for the eye condition, if applicable, to identify the cause of the eye condition

Source: CMS ICD-10-CM Tabular List. How to read instructional notes.

Clinical InformationClinical

  • Iridocyclitis

    acute or chronic inflammation of the iris and ciliary body characterized by exudates into the anterior chamber, discoloration of the iris, and constricted, sluggish pupil. symptoms include radiating pain, photophobia, lacrimation, and interference with vision.

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 2017–2026No changes
FY 2027CurrentCurrent code set, no changesEffective October 1, 2026 through September 30, 2027.

Questions About H20Overview

What is the ICD-10 code for iridocyclitis?

H20 is the ICD-10-CM category for iridocyclitis, but it is a non-billable header: claims need a more specific code from this category, listed on this page.

Is H20 (Iridocyclitis) a billable code?

No. This is a category header that groups the codes for iridocyclitis, and headers cannot be submitted on claims. Claims for iridocyclitis need a more specific code from this category, such as H20.00, H20.011, and H20.012.