2027 ICD-10-CM Diagnosis Code H20.9Unspecified iridocyclitis
ICD-10-CM Codes›H00–H59›H15-H22›H20
- Billable — Valid for Submission
- CC — Complication or Comorbidity
- Not Chronic
H20.9 is a billable ICD-10-CM diagnosis code for unspecified iridocyclitis. 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. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Uveitis and ocular inflammation.
Code Identity
Code Classification
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 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
Instructional NotesGuidance
Instructions from the official ICD-10-CM Tabular List that apply to H20.9: its own notes plus those printed at Chapter 7. A note printed at a category, block or chapter applies to every code under it.
Applicable To
Conditions this code is used for: synonyms of the title or, for "other specified" codes, the conditions assigned to it. The list is not exhaustive.
- Uveitis NOS
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.
- 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.
- 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.
Index to Diseases and InjuriesGuidance
Alphabetical index entries that point to this code.
Cyclitis See Also: Iridocyclitis; H20.9
Iridocyclitis H20.9
Clinical ClassificationClinical
AHRQ’s CCSR groups this code into broader clinical categories.
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:
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- What are the symptoms of eye diseases?
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- 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 H20.9 to ICD-9-CMHistory
The closest ICD-9-CM equivalents under the General Equivalence Mappings.
Code HistoryHistory
Questions About H20.9Overview
What is the ICD-10 code for unspecified iridocyclitis?
The ICD-10-CM code for unspecified iridocyclitis is H20.9 (sometimes written as H209). It is billable on HIPAA-covered claims from October 1, 2026 through September 30, 2027.
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, 2026 through September 30, 2027.
What MS-DRG does H20.9 group to?
When unspecified iridocyclitis 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 H20.9 a CC or MCC?
CMS lists H20.9 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.
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.
