2027 ICD-10-CM Diagnosis Code H20.022Recurrent acute iridocyclitis, left eye

ICD-10-CM Codes›H00–H59›H15-H22›H20

ICD-10-CM H20.022
CMSSource: CMS FY 2027 ICD-10-CM dataset · Effective Oct 1, 2026 – Sep 30, 2027

H20.022 is a billable ICD-10-CM diagnosis code for recurrent acute iridocyclitis, left eye. It is valid on HIPAA claims for fiscal year 2027 (October 1, 2026 through September 30, 2027) and groups to MS-DRG 124 through 125. As a secondary diagnosis, it counts as a complication or comorbidity (CC) and moves an inpatient stay to a higher severity level within its MS-DRG family. It does not count, however, when the principal diagnosis is one of 39 closely related codes. Coders also document this condition as recurrent anterior uveitis. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Uveitis and ocular inflammation.

Code Identity

ICD-10-CM Code
H20.022
Billable Status
Yes — Valid for Submission
Code Describes
Recurrent acute iridocyclitis, left eye
Short Description
Recurrent acute iridocyclitis, left eye
Same as the full description in the CMS dataset.
Parent Code
H20.02
Recurrent acute iridocyclitis

Code Classification

ChapterH00–H59Diseases of the eye and adnexa
SectionH15-H22Disorders of sclera, cornea, iris and ciliary body
CategoryH20Iridocyclitis
This CodeH20.022Recurrent acute iridocyclitis, left eye

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Recurrent anterior uveitis
  • Recurrent iridocyclitis
  • Recurrent iridocyclitis of left eye
  • Recurrent iritis
  • Recurrent iritis of left eye

Instructional NotesGuidance

Instructions from the official ICD-10-CM Tabular List that apply to H20.022: its own notes plus those printed at H20.0 and Chapter 7. A note printed at a category, block or chapter applies to every code under it.

Excludes1

Not coded here: the excluded code is never reported together with this one, unless the two conditions are unrelated.

From H20.0 Acute and subacute iridocyclitis applies to 21 codes
  • iridocyclitis, iritis, uveitis (due to) (in) diabetes mellitus (E08-E13 with .39)
  • iridocyclitis, iritis, uveitis (due to) (in) diphtheria (A36.89)
  • iridocyclitis, iritis, uveitis (due to) (in) gonococcal (A54.32)
  • iridocyclitis, iritis, uveitis (due to) (in) herpes (simplex) (B00.51)
  • iridocyclitis, iritis, uveitis (due to) (in) herpes zoster (B02.32)
  • iridocyclitis, iritis, uveitis (due to) (in) late congenital syphilis (A50.39)
  • iridocyclitis, iritis, uveitis (due to) (in) late syphilis (A52.71)
  • iridocyclitis, iritis, uveitis (due to) (in) sarcoidosis (D86.83)
  • iridocyclitis, iritis, uveitis (due to) (in) syphilis (A51.43)
  • iridocyclitis, iritis, uveitis (due to) (in) toxoplasmosis (B58.09)
  • iridocyclitis, iritis, uveitis (due to) (in) tuberculosis (A18.54)

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 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.

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.

Convert H20.022 to ICD-9-CMHistory

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

ICD-9-CM
364.02 Recurrent iridocyclitis
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 2017–2026No changes
FY 2027CurrentCurrent code set, no changesEffective October 1, 2026 through September 30, 2027.

Questions About H20.022Overview

What is the ICD-10 code for recurrent acute iridocyclitis, left eye?

The ICD-10-CM code for recurrent acute iridocyclitis, left eye is H20.022 (sometimes written as H20022). It is billable on HIPAA-covered claims from October 1, 2026 through September 30, 2027.

Is H20.022 (Recurrent acute iridocyclitis) a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report recurrent acute iridocyclitis, left eye on HIPAA-covered claims from October 1, 2026 through September 30, 2027.

What MS-DRG does H20.022 group to?

When recurrent acute iridocyclitis, left eye is the principal diagnosis on an inpatient stay, it groups to MS-DRG 125, 124, with relative weights from 0.7699 to 1.2470 depending on complications. Higher weights mean higher Medicare reimbursement.

Is H20.022 a CC or MCC?

CMS lists H20.022 as a CC (complication or comorbidity) for FY 2027. Reported as a secondary diagnosis, it moves the inpatient stay to a higher-weighted DRG within its severity family. It does not count when the principal diagnosis is one of the 39 closely related codes in its exclusion list.

Can H20.022 be reported with A36.89?

Not as a rule. The Excludes1 note at H20.0, which applies to H20.022, lists "iridocyclitis, iritis, uveitis (due to) (in) diphtheria (A36.89)". An Excludes1 note means the excluded code is never reported together with this one; the only exception is when the two conditions are unrelated to each other (Official Guidelines, Section I.A.12.a).