2026 ICD-10-CM Diagnosis Code H20.9Unspecified iridocyclitis

ICD-10-CM CodesH00–H59H15-H22H20

ICD-10-CM H20.9
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

H20.9 is a billable ICD-10-CM diagnosis code for unspecified iridocyclitis. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026) and groups to MS-DRG 124 through 125. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Uveitis and ocular inflammation.

Code Identity

ICD-10-CM Code
H20.9
Billable Status
Yes — Valid for Submission
Code Describes
Unspecified iridocyclitis
Short Description
Unspecified iridocyclitis
Same as the full description in the CMS dataset.
Parent Code
Iridocyclitis

Code Classification

ChapterH00–H59Diseases of the eye and adnexa
SectionH15-H22Disorders of sclera, cornea, iris and ciliary body
CategoryH20Iridocyclitis
This CodeH20.9Unspecified iridocyclitis

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Acute angle closure of left eye due to uveitis
  • Acute angle closure of right eye due to uveitis
  • Angle closure of left eye due to uveitis
  • Angle closure of right eye due to uveitis
  • Anterior uveitis
  • Anterior uveitis due to juvenile idiopathic arthritis
  • Bilateral acute angle closure
  • Bilateral acute angle closure due to uveitis
  • Bilateral angle closure due to uveitis
  • Bilateral glaucomatocyclitic crisis
  • Bilateral iritis due to and following surgical procedure on bilateral eye regions
  • Bilateral ocular hypertension due to uveitis
  • Bilateral pars planitis
  • Bilateral secondary acute angle closure
  • Bilateral uveitis of eyes
  • Cyclitis
  • Drug-induced uveitis
  • Extraintestinal Crohn's
  • Glaucoma due to eye inflammation
  • Glaucomatocyclitic crisis
  • Glaucomatocyclitic crisis of left eye
  • Glaucomatocyclitic crisis of right eye
  • Gouty iritis
  • Idiopathic anterior uveitis
  • Infective uveitis
  • Intermediate uveitis
  • Iridocyclitis
  • Iridocyclitis of bilateral eyes
  • Iridocyclitis of left eye
  • Iridocyclitis of right eye
  • Iritis
  • Iritis co-occurrent with inflammatory bowel disease
  • Iritis due to diabetes mellitus
  • Iritis in Behcet's syndrome
  • Iritis of bilateral eyes
  • Iritis of left eye
  • Iritis of left eye due to and following surgical procedure on left eye region
  • Iritis of right eye
  • Iritis of right eye due to and following surgical procedure on right eye region
  • Iritis with Crohn's disease
  • Iritis with ulcerative colitis
  • Keratouveitis
  • Multiple sclerosis associated intermediate uveitis
  • Non-infectious anterior uveitis
  • Ocular hypertension of left eye due to uveitis
  • Ocular hypertension of right eye due to uveitis
  • Optic disc swelling co-occurrent with uveitis
  • Paraneoplastic uveitis
  • Pars planitis
  • Pars planitis of left eye
  • Pars planitis of right eye
  • Postoperative uveitis
  • Post-traumatic uveitis
  • Primary anterior uveitis
  • Sclerouveitis
  • Secondary acute angle closure due to uveitis
  • Secondary angle closure due to uveitis
  • Secondary ocular hypertension due to uveitis
  • Traumatic iritis
  • Tubulointerstitial nephritis with uveitis syndrome
  • Uveitis
  • Uveitis caused by ranibizumab
  • Uveitis due to juvenile idiopathic arthritis
  • Uveitis due to leptospirosis
  • Uveitis of left eye
  • Uveitis of right eye

Tabular List NotesGuidance

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

Inclusion Terms

  • Uveitis NOS

Index to Diseases and InjuriesGuidance

Alphabetical index entries that point to this code.

  • - Cyclitis - See Also: Iridocyclitis; - H20.9

External Cause of Injuries IndexGuidance

References for this code in the External Cause of Injuries Index.

    • Cyclitis
    • Iridocyclitis

Clinical ClassificationClinical

AHRQ’s CCSR groups this code into broader clinical categories.

CCSR EYE004
Uveitis and ocular inflammation
Default principal diagnosis: inpatient Yes · outpatient Yes

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.
  • Ophthalmia, Sympathetic

    granulomatous uveitis which follows in one eye after a penetrating injury to the other eye; the secondarily affected eye is called the sympathizing eye, and the injured eye is called the exciting or activating eye.
  • Uveitis

    inflammation of part or all of the uvea, the middle (vascular) tunic of the eye, and commonly involving the other tunics (sclera and cornea, and the retina). (dorland, 27th ed)
  • Uveitis, Anterior

    inflammation of the anterior uvea comprising the iris, angle structures, and the ciliary body. manifestations of this disorder include ciliary injection, exudation into the anterior chamber, iris changes, and adhesions between the iris and lens (posterior synechiae). intraocular pressure may be increased or reduced.
  • Uveitis, Intermediate

    inflammation of the pars plana, ciliary body, and adjacent structures.
  • Uveitis, Posterior

    inflammation of the choroid as well as the retina and vitreous body. some form of visual disturbance is usually present. the most important characteristics of posterior uveitis are vitreous opacities, choroiditis, and chorioretinitis.
  • Uveitis, Suppurative

    intraocular infection caused mainly by pus-producing bacteria and rarely by fungi. the infection may be caused by an injury or surgical wound (exogenous) or by endogenous septic emboli in such diseases as bacterial endocarditis or meningococcemia.
  • Pars Planitis

    form of granulomatous uveitis occurring in the region of the pars plana. this disorder is a common condition with no detectable focal pathology. it causes fibrovascular proliferation at the inferior ora serrata.
  • Iritis

    inflammation of the iris characterized by circumcorneal injection, aqueous flare, keratotic precipitates, and constricted and sluggish pupil along with discoloration of the iris.
  • Chronic Iridocyclitis|Chronic Uveitis

    uveitis that is usually insidious in onset, bilateral, and can be asymptomatic, most often affecting the anterior uveal tract, including the iris and ciliary body, and can result in long-term complications. it is most commonly associated with certain forms of juvenile idiopathic arthritis, but may occur independent of arthritis.
  • Iridocyclitis

    inflammation of the iris and the ciliary body.
  • Acute Anterior Uveitis

    sudden onset of anterior uveitis, usually unilateral, and associated with pain, erythema, photophobia, and blurred vision. often associated with hla-b27, with or without co-existing spondyloarthritis.
  • Anterior Uveitis

    inflammation of the iris and anterior chamber of the eye.
  • CDAI Version 1 - Iritis/Uveitis|CDAI01-Iritis/Uveitis|CDAI01-Iritis/Uveitis|CDAI0110

    crohn's disease activity index version 1 (cdai version 1) iritis/uveitis.
  • Grade 1 Uveitis, CTCAE|Grade 1 Uveitis|Grade 1 Uveitis

    anterior uveitis with trace cells
  • Grade 2 Uveitis, CTCAE|Grade 2 Uveitis|Grade 2 Uveitis

    anterior uveitis with 1+ or 2+ cells
  • Grade 3 Uveitis, CTCAE|Grade 3 Uveitis|Grade 3 Uveitis

    anterior uveitis with 3+ or greater cells; intermediate posterior or pan-uveitis
  • Grade 4 Uveitis, CTCAE|Grade 4 Uveitis|Grade 4 Uveitis

    best corrected visual acuity of 20/200 or worse in the affected eye
  • HBI - Complication: Uveitis|HBI01-Complication: Uveitis|HBI01-Complication: Uveitis|HBI0105B

    harvey-bradshaw index (hbi) complication: uveitis.
  • Intermediate Uveitis|Pars Planitis

    inflammation of the pars plana.
  • Panuveitis

    a disorder characterized by inflammation of the entire uvea which includes the iris, ciliary body, and choroid. causes include systemic infections, sarcoidosis, and cancers.
  • Posterior Uveitis|Choroiditis

    an inflammatory process that affects the choroid.
  • Tubulointerstitial Nephritis and Uveitis|TINU

    an autoimmune disorder comprising tubulointerstitial nephritis and uveitis.
  • Uveitis

    an inflammatory process affecting a part of or the entire uvea. causes include inflammatory agents (e.g., herpes simplex, herpes zoster, leptospirosis) and systemic diseases (e.g., inflammatory bowel disease, multiple sclerosis, systemic lupus erythematosus, ankylosing spondylitis). patients present with pain and redness in the eye, light sensitivity, and blurred and decreased vision.
  • Uveitis Glaucoma and Hyphema Syndrome|UGH (Uveitis Glaucoma Hyphema) Syndrome

    clinical triad of uveitis, glaucoma, and hyphema (ugh), especially associated with the early anterior chamber intraocular lens (iol). glaucoma is believed to be caused by movement of the iol against the iris causing release of inflammatory and red blood cell debris, which obstruct the trabecular meshwork. the haptic also may cause direct damage to the trabecular meshwork contributing to the glaucoma. incidence of ugh is dependent on both surgical methodology applied in the cataract population and type of iol used. ugh is particularly common if metal clip lenses have been used. components of the condition may be reversed if the offending iol is removed before permanent damage has occurred.
  • Uveitis, CTCAE|Uveitis|Uveitis|Uveitis

    a disorder characterized by inflammation to the uvea of the eye.
  • Cyclitis

    inflammation of the ciliary body.
  • Pars Planitis

    an inflammatory disorder of the cilliary body in the uvea that affects healthy, younger individuals who are often asymptomatic. it has a long clinical course with relapses and remissions. symptoms include mildly decreased vision and floaters. it may be associated with autoimmune disorders.
  • Iritis

    inflammation of the iris.
  • Ophthalmology Uveitis and Ocular Inflammatory Disease Specialist|Ophthalmology Uveitis and Ocular Inflammatory Disease|Ophthalmology Uveitis and Ocular Inflammatory Disease

    an ophthalmologist with additional training/certification in the treatment of uveitis and inflammatory disease of the eye.

Patient EducationClinical

Eye Diseases

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Read the full article at MedlinePlus

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Convert H20.9 to ICD-9-CMHistory

The closest ICD-9-CM equivalents under the General Equivalence Mappings.

ICD-9-CM
364.3 Iridocyclitis NOS
Approximate The match is approximate rather than exact.

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 H20.9Overview

Is H20.9 (Iridocyclitis) a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report unspecified iridocyclitis on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

What MS-DRG does H20.9 group to?

When unspecified iridocyclitis is the principal diagnosis on an inpatient stay, it groups to MS-DRG 124, 125, with relative weights from 0.7678 to 1.3231 depending on complications. Higher weights mean higher Medicare reimbursement.

What is the ICD-9 equivalent of H20.9?

Under the General Equivalence Mappings, unspecified iridocyclitis converts to ICD-9-CM 364.3 (iridocyclitis NOS). The mapping is approximate, so confirm the match fits the documentation.

Footnotes

[1] Not chronic - A diagnosis code that does not fit the criteria for chronic condition (duration, ongoing medical treatment, and limitations) is considered not chronic. Some codes designated as not chronic are acute conditions. Other diagnosis codes that indicate a possible chronic condition, but for which the duration of the illness is not specified in the code description (i.e., we do not know the condition has lasted 12 months or longer) also are considered not chronic.