H20.011

🧬 ICD-10-CM H20.011 - Primary Iridocyclitis, Right Eye

⚠️ Note: H20.011 is an ICD-10-CM diagnosis code, not a CPT procedure code. Fields such as wRVU, global period, and assistant payable do not apply to diagnosis codes. This note includes associated CPT procedure codes and billing information in the Associated CPT Procedures section below.

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Short Definition

Primary iridocyclitis of the right eye — an acute or subacute inflammatory condition of the iris (iritis) and ciliary body (cyclitis) of the right eye with no identifiable underlying systemic, infectious, or traumatic cause at the time of diagnosis (idiopathic/primary).

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Long / Clinical Definition

Iridocyclitis is inflammation of the anterior uveal tract, specifically involving the iris and ciliary body simultaneously. When the inflammation is limited to the iris, it is termed iritis; when the ciliary body is exclusively involved, it is termed cyclitis. In clinical practice, both structures are typically involved concurrently, hence the combined term iridocyclitis, which is synonymous with anterior uveitis.

The prefix “primary” in H20.011 designates that:

1. No confirmed underlying systemic, infectious, autoimmune, or trauma-related etiology has been identified at the time of the encounter, OR
2. A thorough workup has been completed and no underlying cause was found (truly idiopathic)

This is distinct from:

• Secondary infectious iridocyclitis (H20.03x) — caused by herpes simplex, TB, toxoplasmosis, syphilis, etc.
• Secondary noninfectious iridocyclitis (H20.04x) — associated with systemic autoimmune disease (ankylosing spondylitis, psoriatic arthritis, IBD, sarcoidosis, juvenile idiopathic arthritis)
• Recurrent acute iridocyclitis (H20.02x) — documented pattern of repeated acute episodes (important clinical distinction — upgrade from H20.011 to H20.02x when recurrence is established)

Anatomy Review

The uveal tract is the vascular middle layer of the eye, consisting of three contiguous structures:

• Iris — colored diaphragm controlling pupil size; floats in the aqueous humor
• Ciliary body — ring-shaped structure posterior to the iris; produces aqueous humor; contains ciliary muscle for accommodation
• Choroid — posterior vascular layer between sclera and retina

Anterior uveitis = inflammation of the iris and/or ciliary body (anterior uvea) Intermediate uveitis = inflammation of the vitreous and peripheral retina/pars plana Posterior uveitis = inflammation of choroid and/or retina Panuveitis = all uveal layers involved

Note

H20.011 specifically covers anterior uveitis affecting the iris and ciliary body of the right eye.

Clinical Presentation

Feature	Typical Finding
Onset	Acute or subacute; may be sudden
Pain	Aching, periocular, or deep orbital pain — worsens with light (photophobia)
Vision	Variable; mild blurring from flare, cells, or inflammatory miosis
Photophobia	Prominent — pathognomonic for anterior uveitis
Redness	Perilimbal (circumcorneal) injection — “ciliary flush”
Tearing/Lacrimation	Often present
Pupil	Constricted (miosis), sluggish, or irregular; posterior synechiae may distort pupil shape
Slit Lamp	Cells and flare in the anterior chamber; keratic precipitates (KPs) on corneal endothelium; possible hypopyon in severe cases
IOP	Variable — may be elevated (trabeculitis) or reduced (ciliary body suppression)

Grading of Anterior Chamber Cells (SUN Classification)

Grade	Cells per 1mm × 1mm Field	Clinical Significance
0	< 1	No activity
0.5+	1-5 cells	Trace
1+	6-15 cells	Mild
2+	16-25 cells	Moderate
3+	26-50 cells	Marked
4+	> 50 cells	Severe

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Area of the Body

• Primary Structure: Iris and ciliary body of the right eye — anterior uveal tract
• Secondary Structures Affected: Anterior chamber (aqueous humor), corneal endothelium (KPs), lens (posterior synechiae may bind iris to lens capsule), trabecular meshwork (elevated IOP/trabeculitis), vitreous (spillover cells in severe cases)
• Vascular Supply: Major arterial circle of the iris (from long posterior ciliary arteries and anterior ciliary arteries — branches of ophthalmic artery)
• Innervation: Cranial nerve III (oculomotor) — sphincter pupillae (parasympathetic via ciliary ganglion); sympathetic fibers — dilator pupillae
• Laterality: Right eye exclusively — if left eye involved, use H20.012; if bilateral, use H20.013
• Adjacent Structures at Risk: Intraocular pressure elevation (secondary glaucoma — H40.4x), cataract formation (H26.x), cystoid macular edema (H35.81), band keratopathy (H18.42x), vitreous spillover

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Code Tree / Hierarchy

ICD-10-CM (FY2026)  
└── Chapter VII - Diseases of the Eye and Adnexa (H00-H59)  
└── H15-H22 - Disorders of Sclera, Cornea, Iris and Ciliary Body  
└── H20 - Iridocyclitis (non-billable header)  
├── H20.0 - Acute and Subacute Iridocyclitis (non-billable)  
│ ├── H20.00 - Unspecified acute and subacute iridocyclitis  
│ │ ├── H20.001 - right eye ✅ (billable)  
│ │ ├── H20.002 - left eye  
│ │ ├── H20.003 - bilateral  
│ │ └── H20.009 - unspecified eye ⚠️ Avoid — laterality required  
│ ├── H20.01 - PRIMARY Iridocyclitis (non-billable parent)  
│ │ ├── H20.011 - right eye ✅ ← THIS CODE  
│ │ ├── H20.012 - left eye  
│ │ ├── H20.013 - bilateral  
│ │ └── H20.019 - unspecified eye ⚠️ Avoid — query for laterality  
│ ├── H20.02 - RECURRENT ACUTE Iridocyclitis (non-billable parent)  
│ │ ├── H20.021 - right eye ✅ (use when pattern of recurrence established)  
│ │ ├── H20.022 - left eye  
│ │ ├── H20.023 - bilateral  
│ │ └── H20.029 - unspecified eye  
│ ├── H20.03 - SECONDARY INFECTIOUS Iridocyclitis (non-billable parent)  
│ │ ├── H20.031 - right eye ✅ (use when confirmed infectious etiology)  
│ │ ├── H20.032 - left eye  
│ │ ├── H20.033 - bilateral  
│ │ └── H20.039 - unspecified eye  
│ ├── H20.04 - SECONDARY NONINFECTIOUS Iridocyclitis (non-billable parent)  
│ │ ├── H20.041 - right eye ✅ (use when confirmed systemic autoimmune etiology)  
│ │ ├── H20.042 - left eye  
│ │ ├── H20.043 - bilateral  
│ │ └── H20.049 - unspecified eye  
│ └── H20.05 - Hypopyon (non-billable parent)  
│ ├── H20.051 - right eye ✅ (severe uveitis with layered WBCs)  
│ ├── H20.052 - left eye  
│ ├── H20.053 - bilateral  
│ └── H20.059 - unspecified eye  
├── H20.1 - Chronic Iridocyclitis (non-billable parent)  
│ ├── H20.10 - Chronic iridocyclitis, unspecified eye ✅  
│ ├── H20.11 - Chronic iridocyclitis, right eye ✅  
│ ├── H20.12 - Chronic iridocyclitis, left eye ✅  
│ └── H20.13 - Chronic iridocyclitis, bilateral ✅  
├── H20.2 - Lens-Induced Iridocyclitis (non-billable parent)  
│ ├── H20.20 - unspecified eye ✅  
│ ├── H20.21 - right eye ✅  
│ ├── H20.22 - left eye ✅  
│ └── H20.23 - bilateral ✅  
├── H20.8 - Other Iridocyclitis (non-billable parent)  
│ ├── H20.81 - Fuchs' heterochromic cyclitis (non-billable)  
│ │ ├── H20.811 - right eye ✅  
│ │ ├── H20.812 - left eye ✅  
│ │ ├── H20.813 - bilateral ✅  
│ │ └── H20.819 - unspecified ✅  
│ └── H20.82 - Vogt-Koyanagi syndrome (non-billable)  
│ ├── H20.821 - right eye ✅  
│ ├── H20.822 - left eye ✅  
│ ├── H20.823 - bilateral ✅  
│ └── H20.829 - unspecified ✅  
└── H20.9 - Unspecified Iridocyclitis ✅ (billable — avoid when specificity achievable)

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ICD-10-CM Tabular Includes & Excludes

Includes (at H20.0 subcategory level)

Per the ICD-10-CM FY2026 Tabular List, the following are included within the H20.0 (Acute and Subacute Iridocyclitis) category from which H20.011 derives:

• Acute anterior uveitis, right eye (primary)
• Acute cyclitis, right eye (primary)
• Acute iritis, right eye (primary)
• Subacute anterior uveitis, right eye (primary)
• Subacute cyclitis, right eye (primary)
• Subacute iritis, right eye (primary)
• Idiopathic anterior uveitis, right eye (acute presentation)

Excludes 1 (at H20.0 Level — Cannot Code Simultaneously)

Excludes 1 = NOT CODED HERE. The following specific forms of iridocyclitis have dedicated codes in other ICD-10-CM chapters and must not be coded with H20.011 because the Excludes 1 note makes them mutually exclusive at the H20.0 category level.

Excluded Code	Condition	Notes
E08-E13 with .39	Iridocyclitis/iritis/uveitis due to diabetes mellitus	Diabetic anterior uveitis → code diabetic combination code first (e.g., E11.39 + H20.011 is allowed as a manifestation sequence, but E11.39 covers the DM-related uveitis; do NOT use H20.0x for DM-caused uveitis — the combination E11.39 is the coding mechanism)
A36.89	Iridocyclitis/uveitis due to diphtheria	Use A36.89 for diphtheritic uveitis
A54.32	Iridocyclitis/uveitis due to gonococcal infection	Use A54.32 for gonococcal iridocyclitis — NOT H20.011
B00.51	Iridocyclitis/uveitis due to herpes simplex	Herpetic anterior uveitis → B00.51 exclusively
B02.32	Iridocyclitis/uveitis due to herpes zoster	Varicella-zoster virus (VZV) anterior uveitis → B02.32 exclusively
A50.39	Iridocyclitis/uveitis due to late congenital syphilis	Congenital syphilitic uveitis → A50.39
A52.71	Iridocyclitis/uveitis due to late (acquired) syphilis	Syphilitic uveitis → A52.71 exclusively
D86.83	Iridocyclitis/uveitis due to sarcoidosis	Sarcoid uveitis → D86.83 exclusively (NOT H20.04x — sarcoid has its own manifestation code)
A51.43	Iridocyclitis/uveitis due to secondary syphilis	Secondary syphilitic uveitis → A51.43
B58.09	Iridocyclitis/uveitis due to toxoplasmosis	Toxoplasmic uveitis → B58.09 exclusively
A18.54	Iridocyclitis/uveitis due to tuberculosis	TB uveitis → A18.54 exclusively

Note

⚠️ Critical Coding Impact: The Excludes 1 list for H20.0 is exceptionally important and comprehensive. All of the above represent specific disease-caused uveitis that has been given its own ICD-10-CM code in the relevant disease chapter. When any of these confirmed etiologies are present, the H20.0x code series is entirely bypassed — the etiology-specific code is used instead, and there is no need to also add H20.011.

The single most dangerous coding error for H20.011 is using it when a confirmed infectious or systemic etiology exists. Always determine — is there a confirmed underlying cause? If yes, use the cause-specific code.

Excludes 2 (at H20 Category Level — May Code Together)

Excludes 2 = Not included here but may be coded in addition to H20.011 when both conditions are present.

Excluded Code	Description	Coding Guidance
H40.4x	Glaucoma secondary to eye inflammation	✅ Code together: when inflammatory glaucoma develops as a complication of iridocyclitis, report H40.4x alongside H20.011
H26.x	Complicated cataract	✅ Code together: posterior subcapsular cataract secondary to chronic iridocyclitis or steroid treatment
H35.81x	Macular edema following cataract surgery / inflammatory CME	✅ Cystoid macular edema (CME) as a complication of severe uveitis
H18.42x	Band-shaped keratopathy	✅ May code together when calcium band keratopathy develops secondary to chronic iridocyclitis
H44.13x	Sympathetic uveitis	✅ If sympathetic uveitis develops contralaterally; distinct entity

Use Additional Code Conventions

When H20.011 is used as the primary code (for truly primary/idiopathic iridocyclitis), the following additional codes may be reported to capture the full clinical picture:

Instruction	Code(s)	Context
Code underlying systemic disease if workup reveals etiology	M45.x (ankylosing spondylitis), M07.x (psoriatic arthritis), K50-K51 (IBD), M08.x (JIA)	When workup reveals an autoimmune etiology, transition to H20.04x + the systemic disease code
Glaucoma complication	H40.40x-H40.43x	Secondary glaucoma complicating iridocyclitis
HLA-B27 association (when documented)	Z13.88 or clinical note	HLA-B27 positivity is not separately codable but should be documented; drives recurrence risk
Posterior synechiae	H21.52x	Documented adhesion of iris to lens capsule
Hypopyon	H20.05x	Layered WBCs in inferior anterior chamber — severe uveitis; use instead of H20.011 when hypopyon is documented

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Coding Specificity: When to Use H20.011 vs. Sibling Codes

This is the most critical coding decision for uveitis encounters:

Clinical Scenario	Correct Code	Rationale
First episode, no confirmed etiology, right eye	H20.011 ✅	Primary iridocyclitis — workup pending or negative
First episode, right eye — confirmed ankylosing spondylitis	H20.041 + M45.x	Secondary noninfectious; AS as additional
Second or subsequent episode — documented recurrence pattern, right eye	H20.021	Recurrent acute iridocyclitis — upgrade code when recurrence confirmed
Inflammation present > 3 months, right eye	H20.11	Chronic iridocyclitis — time threshold crossed
Confirmed HSV anterior uveitis, right eye	B00.51	Excludes 1 — herpes simplex uveitis
Confirmed TB uveitis, right eye	A18.54	Excludes 1 — TB uveitis
Confirmed sarcoid uveitis	D86.83	Excludes 1 — sarcoidosis uveitis
Severe hypopyon uveitis, right eye	H20.051	Hypopyon — more specific; use instead of H20.011
Uveitis due to cataract lens particle, right eye	H20.21	Lens-induced iridocyclitis — specific etiology code
Fuchs’ heterochromic cyclitis, right eye	H20.811	Specific syndrome — use over H20.011
Vogt-Koyanagi-Harada syndrome, right eye	H20.821	Specific syndrome — use over H20.011

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HCC Status & Risk Adjustment

Direct HCC Status of H20.011

Item	Value
CMS-HCC V28 Direct Mapping	❌ Not directly mapped to HCC
HHS-HCC (ACA Exchange Plans)	❌ Not mapped
RAF Score Contribution (standalone)	$0 additional RAF from H20.011 alone

HCC-Mapped Systemic Conditions Associated with Iridocyclitis

Although H20.011 carries no direct HCC weight, it is frequently the presenting finding that triggers investigation and confirmation of an HCC-mapped underlying systemic disease. This makes the iridocyclitis encounter clinically significant for risk adjustment purposes beyond the eye visit itself.

ICD-10-CM	Description	HCC Status	HCC #	Association with H20.011
M45.0-M45.9	Ankylosing spondylitis	✅ HCC-40	Rheumatoid Arthritis & Inflammatory Connective Tissue Disease	Most common systemic association with HLA-B27+ uveitis; ~25-40% of AAION patients have AS
M07.60-M07.69	Psoriatic arthritis with arthritis mutilans	✅ HCC-40	Same	Psoriatic arthritis-associated anterior uveitis
[[M08.00-M08.99	Juvenile idiopathic arthritis (JIA)	✅ HCC-40	Same	JIA is the leading cause of uveitis in children; often chronic, insidious, antinuclear antibody-positive
K50.x	Crohn’s disease	✅ HCC-35	Inflammatory Bowel Disease	IBD-associated anterior uveitis (HLA-B27 linked)
K51.x	Ulcerative colitis	✅ HCC-35	Inflammatory Bowel Disease	UC-associated uveitis
G35.-	Multiple sclerosis	✅ HCC-77	Multiple Sclerosis	MS-associated intermediate uveitis (more than anterior, but anterior overlap exists)
D86.83	Sarcoidosis with iridocyclitis	✅ May map to systemic sarcoid HCC	—	Excludes 1 from H20.0x but sarcoidosis itself should be coded
M32.9	Systemic lupus erythematosus (SLE)	✅ HCC-40	Connective Tissue Disease	SLE-associated uveitis
M35.00-M35.09	Sjögren’s syndrome	✅ HCC-40	CTD	Sjögren’s with anterior uveitis
M31.6	Giant cell arteritis	✅ HCC-40	CTD/Inflammatory Vascular	Rarely causes anterior uveitis; more commonly ION
B20	HIV disease	✅ HCC-1	HIV/AIDS	HIV-associated opportunistic uveitis (CMV, toxoplasma, syphilis — but those have own Excludes 1 codes)
N18.4	CKD Stage 4	✅ HCC-328	CKD	Comorbidity in chronic uveitis management (affects drug dosing)
E11.39	Type 2 DM with other diabetic ophthalmic complication	✅ HCC-37	Diabetes	DM-related uveitis is Excludes 1 from H20.0x but DM as comorbidity managing steroids is code-able

Note

💡 HCC Opportunity: Anterior uveitis is a well-known clinical sentinel for HLA-B27-associated spondyloarthropathy. When a patient presents with acute iridocyclitis (H20.011) and is subsequently found to have ankylosing spondylitis (M45.x = HCC-40), both the ophthalmologist’s coding and the rheumatologist’s coding contribute to the patient’s RAF score. Ophthalmologists should ensure that confirmed systemic diagnoses driving the uveitis are captured at every visit — not just by the rheumatologist.

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MS-DRG Assignment (Inpatient Facility)

Iridocyclitis/anterior uveitis as an isolated condition rarely requires inpatient admission. The vast majority of H20.011 encounters occur in the outpatient setting (ophthalmology or optometry office, urgent care, ED). Inpatient admissions associated with H20.011 are typically driven by the underlying systemic disease rather than the eye condition itself.

When H20.011 May Appear on Inpatient Claims

Clinical Scenario	Expected DRG Driver	MS-DRG Family
Severe bilateral uveitis with hypopyon, admission for IV steroids	H20.011 or H20.051 may drive DRG if eye condition primary	MDC 02 - DRG 124/125
Ankylosing spondylitis flare with acute iridocyclitis	M45.x as principal	MDC 08 - Musculoskeletal DRGs
IBD flare with extraintestinal manifestation (uveitis)	K50.x or K51.x as principal	MDC 06 - GI DRGs
JIA exacerbation with uveitis	M08.x as principal	MDC 08 - Musculoskeletal DRGs
Sarcoidosis with acute ocular crisis	D86.83 or D86.x as principal	MDC 04 (if pulmonary) or MDC 08
HIV patient with uveitis due to opportunistic infection	B20 as principal	MDC 25 - HIV DRGs

MDC 02 Mapping (When H20.011 Drives the Admission)

MS-DRG	Description	CC/MCC Tier
124	Other Disorders of the Eye with MCC	MCC present
125	Other Disorders of the Eye without MCC	No MCC

Note

⚠️ In most current grouper versions (v42.x), H20.011 groups to MDC 02 in the Other Disorders of the Eye DRG family. Verify whether the current grouper assigns it to DRG 123 (Neurological Eye Disorders) or 124/125 (Other Eye Disorders). The distinction matters for reimbursement weight. Capturing MCC-level comorbidities (sepsis, severe systemic flare, respiratory failure) shifts the DRG tier.

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Associated CPT Procedure Codes & wRVU Values

Since H20.011 is a diagnosis code, the following represents CPT procedures most commonly billed in the evaluation and management of primary iridocyclitis and anterior uveitis.

Evaluation & Management (Ophthalmology-Specific Codes)

CPT	Description	2026 wRVU (est.)	Global Period	Notes
92004	Ophthalmological services, new patient, comprehensive	2.33	000	New patient with first-episode iridocyclitis
92002	Ophthalmological services, new patient, intermediate	1.12	000	Brief new patient ophthalmological exam
92014	Ophthalmological services, established patient, comprehensive	1.97	000	🔑 Most common code for follow-up iridocyclitis management
92012	Ophthalmological services, established patient, intermediate	0.97	000	Follow-up with limited scope
99205	Office/outpatient E/M, new patient, high complexity	3.50	000	When E/M framework used instead of ophthalmologic exam codes
99215	Office/outpatient E/M, established patient, high complexity	2.85	000	High-complexity established patient visit
99223	Initial hospital care, high complexity	3.86	000	Inpatient admission
99233	Subsequent inpatient E/M, high complexity	2.00	000	Inpatient follow-up

Note

💡 Ophthalmologic E/M Code Choice: Ophthalmologists may bill either the specialty-specific ophthalmological services codes (92004, 92012, 92014) or the standard E/M office visit codes (99202-99215). The ophthalmological codes require documentation of specific ocular examination elements (history, biomicroscopy, IOP measurement, dilation/fundus exam). The standard E/M codes follow the 2021 AMA/CMS E/M guidelines framework. Practices typically select one system and apply it consistently — both are legitimate for H20.011 encounters.

Diagnostic Procedures (Anterior Segment & Uveitis Workup)

CPT	Description	2026 wRVU (est.)	Global Period	Notes
92020	Gonioscopy (separate procedure)	0.48	000	🔑 Angle examination — critical to assess for angle adhesions (peripheral anterior synechiae), secondary glaucoma, and angle closure in iridocyclitis
92025	Computerized corneal topography	0.36	000	If corneal irregularity suspected from KPs or band keratopathy
92250	Fundus photography with interpretation and report	0.44	000	Posterior segment documentation; disc edema, CME
92134	OCT - posterior segment (retina/macula), with interpretation	0.52	000	🔑 Detect cystoid macular edema (CME) — most vision-threatening complication of uveitis
92133	OCT - optic nerve, posterior segment, with interpretation	0.52	000	Assess optic nerve if elevated IOP/glaucoma suspected
92235	Fluorescein angiography (FA) with interpretation and report	1.26	000	Assess posterior segment involvement; CME on FA; intermediate/posterior uveitis spillover
92240	Indocyanine-green (ICG) angiography	1.38	000	Choroidal assessment in posterior spillover
92083	Visual field examination, extended (Humphrey threshold)	0.42	000	Glaucoma/optic nerve involvement monitoring
65800	Paracentesis of anterior chamber (separate procedure)	2.46	010	Aqueous humor tap for diagnostic PCR (HSV, CMV, TB, toxoplasma) when infectious etiology suspected
92132	Scanning computerized ophthalmic diagnostic imaging, anterior segment	0.38	000	Anterior segment OCT — assess angle, cornea, anterior chamber depth

Intraocular Pressure Measurement

CPT	Description	2026 wRVU (est.)	Notes
92100	Serial tonometry examination (separate procedure)	0.42	IOP monitoring — important in iridocyclitis; steroid IOP response monitoring

Surgical / Interventional Procedures

CPT	Description	2026 wRVU (est.)	Assistant Payable	Global Period	Notes
67028	Intravitreal injection of pharmacologic agent (separate procedure)	0.59	No	000	🔑 For treatment-resistant uveitis — intravitreal triamcinolone, dexamethasone implant (Ozurdex), or anti-VEGF for CME
66985	Secondary IOL implant (if cataract surgery needed after uveitis-related cataract)	10.32	Yes - Ind. 1	090	Cataract surgery for uveitic cataract
66984	Cataract surgery, extracapsular with insertion of IOL (simple)	10.32	Yes - Ind. 1	090	Uveitic cataract removal
65820	Goniotomy	6.57	Yes - Ind. 1	090	Angle surgery if inflammatory angle synechiae causing glaucoma
66170	Trabeculectomy with Mitomycin C	14.30	Yes - Ind. 1	090	Glaucoma surgery for inflammatory glaucoma refractory to medical management
67041	Vitrectomy, pars plana approach, with focal endolaser	14.82	Yes - Ind. 1	090	If intermediate/posterior uveitis with vitreous debris or CME refractory to injections

Pharmacy / J-Codes (Common Intravitreal Agents Used in Uveitis)

HCPCS	Drug	Clinical Use
J3301	Triamcinolone acetonide (Kenalog)	Intravitreal or sub-Tenon’s injection for uveitic CME
J0178	Aflibercept (Eylea)	Anti-VEGF for uveitis-related CNV or CME
J7313	Fluocinolone acetonide implant (Retisert)	Sustained-release intravitreal steroid implant for chronic uveitis
J7311	Fluocinolone acetonide injectable suspension (Iluvien)	Long-term uveitis management
J1100	Dexamethasone sodium phosphate	Systemic or intravitreal use
C9257	Dexamethasone intravitreal implant (Ozurdex)	Biodegradable intravitreal implant for macular edema secondary to uveitis

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Common Modifiers for Associated CPT Codes

Modifier	Description	Application with H20.011 Context
-RT	Right side	Required for all laterality-specific procedures (intravitreal injection, gonioscopy, fundus photography, OCT) — matches the right eye laterality of H20.011
-LT	Left side	Required when any procedure is performed on the left eye in the same session (e.g., bilateral OCT)
-50	Bilateral	When the same procedure is performed on both eyes during the same session (e.g., bilateral OCT, bilateral FA)
-25	Significant, Separately Identifiable E/M	When a significant E/M service (92014, 99214, etc.) is performed on the same day as a diagnostic or procedural service (e.g., 92014 + 92020 + 92134 on same date)
-59	Distinct Procedural Service	NCCI override when separate diagnostic procedures might otherwise be bundled; verify current PTP edits for ophthalmic codes before applying
-KX	Documentation of Medical Necessity on File	Required by some MACs on OCT (92134, 92133) claims — H20.011 is a covered diagnosis on most OCT LCDs; check your MAC’s LCD
-52	Reduced Services	When an examination is abbreviated due to patient condition, pain, or cooperation
-GY	Not a Medicare Benefit	Certain diagnostic tests not covered for this diagnosis under Medicare
-57	Decision for Surgery	Appended to E/M code when decision to perform major eye surgery (e.g., trabeculectomy, cataract surgery) is made at the visit
-79	Unrelated Procedure During Global	Unrelated surgical procedure during global period of prior eye surgery

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Coding Examples / Scenarios

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Scenario 1 - First Episode Acute Iridocyclitis, Right Eye, No Known Etiology (Urgent Ophthalmology Visit)

Clinical Situation: A 34-year-old male presents urgently with sudden onset photophobia, right eye pain, and decreased vision. Slit-lamp examination reveals 3+ cells and 2+ flare in the right anterior chamber, fine keratic precipitates (KPs), and a constricted sluggish right pupil. IOP is right eye 18 mmHg, left eye 14 mmHg. No prior history of uveitis. No known systemic disease. Workup ordered (HLA-B27, ANA, ACE, RPR, TB QuantiFERON, CBC, CMP, CXR). Diagnosis: Primary acute anterior uveitis, right eye.

ICD-10-CM:

• H20.011 - Primary iridocyclitis, right eye (first-listed — appropriate since no etiology confirmed at this visit)

CPT:

• 92002-RT - Ophthalmological services, new patient, intermediate (or 92004 if comprehensive exam performed)
• 92020-RT - Gonioscopy, right eye (angle assessment — separate procedure)

✅ H20.011 is the correct first-listed code here. This is a first episode with no established etiology — primary/idiopathic classification is appropriate. Once lab and imaging results return and confirm an underlying disease, the code may need to be updated.

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Scenario 2 - Workup Returns Positive: Ankylosing Spondylitis Confirmed — Code Update

Clinical Situation: The same patient from Scenario 1 returns 2 weeks later. Lab results reveal HLA-B27 positive. Rheumatology has confirmed ankylosing spondylitis (AS) with sacroiliac joint involvement on MRI. The ophthalmologist documents “acute anterior uveitis, right eye, secondary to confirmed ankylosing spondylitis.”

Updated ICD-10-CM (Code Transition):

• H20.041 - Secondary noninfectious iridocyclitis, right eye (code UPDATED from H20.011 — now that a systemic noninfectious etiology is confirmed)
• M45.9 - Ankylosing spondylitis, unspecified sites (underlying systemic disease — code after H20.041 or as co-equal if the rheumatology visit drives AS coding)

⚠️ Code Transition Alert: This scenario illustrates a critical coding principle. When a patient initially coded as H20.011 (primary/idiopathic) is subsequently found to have a systemic etiology, the code must be updated to the more specific subcategory:

• Confirmed autoimmune/noninfectious systemic etiology → H20.04x
• Confirmed infectious etiology → The specific Excludes 1 code (B00.51, A18.54, etc.)
• Confirmed recurrence → H20.02x
• Duration > 3 months → H20.11 (chronic)

Using H20.011 after a systemic etiology is confirmed constitutes inaccurate coding.

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Scenario 3 - Recurrent Acute Iridocyclitis: Code Upgrade from H20.011 to H20.021

Clinical Situation: A 29-year-old HLA-B27 positive female with no confirmed systemic disease has experienced three episodes of acute right-eye iridocyclitis over the past 18 months. The current episode is her fourth. The ophthalmologist documents “recurrent acute anterior uveitis, right eye — fourth episode.”

ICD-10-CM:

• H20.021 - Recurrent acute iridocyclitis, right eye (correct — do NOT use H20.011 once a pattern of recurrence is documented)

💡 Recurrence Upgrade: Once the physician documents a recurrent pattern (typically two or more distinct acute episodes with intervening periods of no inflammation), the code should be upgraded from H20.011 (primary) to H20.021 (recurrent acute). This is clinically and administratively important — recurrent uveitis has different management implications (systemic workup priority, consideration of immunosuppression) and represents a different severity tier than a first episode.

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Scenario 4 - Iridocyclitis with Cystoid Macular Edema (CME) Complication

Clinical Situation: A 45-year-old female with chronic right eye iridocyclitis (H20.11) returns for follow-up. OCT reveals cystoid macular edema (CME), right eye, with central subfield thickness of 380μm (normal <300μm). Vision has decreased from 20/30 to 20/80 right eye. Intravitreal dexamethasone implant (Ozurdex) is administered.

ICD-10-CM:

• H20.11 - Chronic iridocyclitis, right eye (established chronic condition — NOT H20.011)
• H35.811 - Cystoid macular edema following cataract surgery — ⚠️ NOTE: For inflammatory CME (not post-cataract surgery), consider H35.30 (Unspecified macular degeneration) or more specifically code the CME from uveitis as H35.891 (Other specified retinal disorders, right eye). Verify documentation and use most specific available code.

CPT:

• 92014-RT - Ophthalmological services, established patient, comprehensive
• 92134-RT - OCT, retina/macula, right eye
• 67028-RT - Intravitreal injection, pharmacologic agent, right eye
• C9257-RT - Dexamethasone intravitreal implant (Ozurdex) — HCPCS drug code

⚠️ CPT 67028 and the corresponding J/C-code for the drug are billed together on the same claim. The J/C code represents the drug cost; 67028 represents the injection service. Both carry the -RT modifier for right eye.

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Scenario 5 - Iridocyclitis in JIA Patient (Pediatric)

Clinical Situation: A 9-year-old girl with known juvenile idiopathic arthritis (JIA), oligoarticular subtype, presents to ophthalmology for her semi-annual uveitis screening. She has been diagnosed with bilateral chronic anterior uveitis secondary to JIA — currently her right eye shows mild activity (1+ cells). She receives topical prednisolone acetate and is followed by rheumatology on methotrexate.

ICD-10-CM:

• H20.041 - Secondary noninfectious iridocyclitis, right eye (NOT H20.011 — the JIA etiology is confirmed)
• M08.40 - Pauciarticular juvenile idiopathic arthritis, unspecified site (underlying systemic disease — HCC-40)
• Z79.3 - Long-term (current) use of systemic steroids (if on systemic steroids)
• Z79.899 - Long-term (current) use of other medication (methotrexate)

💡 JIA-associated uveitis is the most common form of uveitis in children and is characteristically insidious in onset, asymptomatic, and chronic. These children require routine ophthalmologic screening even without symptoms. H20.041 (secondary noninfectious) is the correct code — NOT H20.011 — once JIA etiology is confirmed.

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Scenario 6 - Paracentesis of Anterior Chamber for Diagnostic Workup

Clinical Situation: A 52-year-old immunocompromised male (on chronic immunosuppression for kidney transplant) presents with severe right anterior uveitis. Despite standard anti-inflammatory therapy, inflammation is refractory. The ophthalmologist performs an anterior chamber paracentesis to obtain aqueous humor for PCR analysis (HSV, CMV, VZV, toxoplasma).

CPT:

• 65800-RT - Paracentesis of anterior chamber, diagnostic, right eye

ICD-10-CM:

• H20.011 - Primary iridocyclitis, right eye (appropriate — no infectious etiology confirmed yet; workup in progress)
• Z94.0 - Kidney transplant status (immunosuppressed context)
• Z79.899 - Long-term (current) use of other medication (tacrolimus/mycophenolate)

Post-Results Update: If PCR returns positive for CMV — update diagnosis to the appropriate infectious code (e.g., B25.8 — Other cytomegaloviral diseases; consult tabular for specific CMV anterior uveitis code). If HSV positive → B00.51. If no organism identified → H20.011 remains appropriate.

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Scenario 7 - Emergency Department Acute Iritis Visit

Clinical Situation: A 27-year-old male presents to the ED with sudden right eye pain, redness, and photophobia. The emergency physician performs a basic slit-lamp examination and diagnoses acute iritis, right eye. Refers urgently to ophthalmology. No systemic disease documented. Prescribes topical prednisolone and cyclopentolate.

ICD-10-CM (ED Claim):

• H20.011 - Primary iridocyclitis, right eye (acute iritis = iridocyclitis = same entity; H20.011 is correct)

CPT (ED):

• 99283 or 99284 - Emergency department E/M (moderate to moderate-high complexity)

✅ H20.011 applies equally to an ED presentation as to an ophthalmology office visit. “Acute iritis,” “acute cyclitis,” and “acute anterior uveitis” are all synonymous with iridocyclitis and code to H20.011 when primary/idiopathic.

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Scenario 8 - Inpatient Admission: Severe Bilateral Uveitis with Hypopyon (Behçet’s Disease Workup)

Clinical Situation: A 38-year-old male is admitted for severe bilateral uveitis with hypopyon in the right eye. Systemic review reveals oral ulcers, genital ulcers, and skin pathergy. Behçet’s disease is suspected and rheumatology is consulted. Workup ongoing. IV steroids initiated.

ICD-10-CM (Inpatient Sequencing):

• H20.051 - Hypopyon, right eye (more specific than H20.011 when hypopyon present — use hypopyon code)
• H20.013 - Primary iridocyclitis, bilateral (for the bilateral anterior uveitis component; hypopyon only right eye)
• M35.2 - Behçet’s disease (if confirmed during workup — sequence as principal if confirmed and drives admission)

⚠️ When hypopyon is documented, use H20.05x (hypopyon) rather than H20.011. Hypopyon represents the most severe tier of anterior chamber inflammation and has its own specific code. The two codes (H20.05x and H20.01x) should not be used simultaneously for the same eye — hypopyon is the more specific and clinically severe designation.

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Documentation Requirements

For accurate coding, medical necessity support, and audit defense, clinical documentation should include:

• Laterality: Right, left, or bilateral — explicitly documented in the assessment/diagnosis
• Acuity/Duration: Acute, subacute, or chronic (> 3 months = chronic → H20.11)
• Episode designation: First episode vs. recurrent (recurrence → H20.02x)
• Anterior chamber activity: Document AC cells and flare grade using SUN criteria (0-4+); document keratic precipitate characteristics (fine KPs = nongranulomatous; mutton-fat KPs = granulomatous/sarcoid/TB)
• Hypopyon: If present, document explicitly — changes code to H20.05x
• Pupillary status: Miosis, irregular pupil, posterior synechiae
• IOP measurement: Both eyes — essential for glaucoma complication detection
• Posterior segment: Dilated fundus exam documentation — vitreous cells (spillover), CME, disc edema
• Etiology assessment: Document working diagnosis, rule-outs, and workup ordered; if etiology confirmed, update diagnosis to specific code (H20.03x, H20.04x, or Excludes 1 code)
• Systemic review of systems: HLA-B27 associated symptoms (back pain, SI joint pain, skin, bowel, genital); TB exposure; prior herpetic disease; sarcoidosis symptoms (pulmonary, skin, lymph nodes)
• Prior episodes: Documented history of prior uveitis episodes — supports recurrent acute classification
• Treatment response: Document AC cell and flare grade at each follow-up — supports medical necessity for ongoing treatment, repeated diagnostic tests (OCT for CME monitoring)
• Medication list: Current and planned — topical steroids (type, frequency), cycloplegics, systemic immunosuppressants, biologics; required for long-term drug use codes (Z79.x)

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Coding Tips & Pitfalls

💡 H20.011 is a transitional code. Think of H20.011 as the code you use while the clinical picture is developing — before a specific etiology is confirmed. It is entirely appropriate at first presentation or when workup is ongoing. The moment a specific cause is confirmed (infectious or systemic), transition to the correct etiologic code. Continuing to use H20.011 after a confirmed AS, JIA, or IBD diagnosis has been made constitutes undercoding.

💡 Iritis = Iridocyclitis = Anterior Uveitis. All three terms are clinically synonymous and code to the H20.0x family. The ICD-10-CM Alphabetic Index entries for “Iritis,” “Cyclitis,” and “Uveitis, anterior” all cross-reference to H20. Do not use any of these as a basis for selecting a different code — they all belong here.

💡 Never assume primary when a systemic disease is documented. The single most common error in uveitis coding is using H20.011 (primary) when the patient has a documented systemic disease associated with uveitis (AS, JIA, IBD, sarcoidosis). This represents incomplete and inaccurate coding. Always review the full problem list and medication list before finalizing the uveitis code selection.

💡 The Excludes 1 list is your most important tabular reference for H20.0x. Memorize or reference the Excludes 1 codes for the H20.0 category. These 10+ specific infectious and disease-caused uveitis codes represent scenarios where H20.0x is entirely bypassed. Billing H20.011 for herpes zoster uveitis (when B02.32 is the correct code) will likely generate a claim edit and potentially trigger an audit.

💡 Hypopyon documentation triggers a code change. If you are coding from a note that mentions “hypopyon,” do not default to H20.011. Hypopyon has its own code — H20.05x (with laterality). Use H20.05x instead of H20.011 when hypopyon is documented. These are different levels of clinical severity, different codes, and different MS-DRG grouping potential.

💡 Chronic uveitis crosses a time threshold. The ICD-10-CM classification distinguishes acute/subacute (H20.0x) from chronic (H20.1x) iridocyclitis. The SUN (Standardization of Uveitis Nomenclature) Working Group defines uveitis as chronic when inflammation has been present for ≥ 3 months. When the ophthalmologist’s notes reflect chronic anterior uveitis or when duration exceeds 3 months without remission, transition to H20.11 (chronic iridocyclitis, right eye). Continuing to use H20.011 for a patient with 2 years of active uveitis constitutes inaccurate code selection.

💡 OCT LCD compliance — KX modifier. Multiple MACs require modifier -KX on CPT 92134 (OCT of the retina) to attest that the medical necessity criteria of the applicable LCD are met for the diagnosis being billed. H20.011 (iridocyclitis) is a covered indication on most MAC OCT LCDs for monitoring cystoid macular edema. Check your specific MAC’s LCD and append -KX when required to prevent claim denial.

💡 Intravitreal injections need -RT or -LT. CPT 67028 (intravitreal injection) must always carry a laterality modifier. When H20.011 (right eye) is the diagnosis driving an intravitreal injection, append -RT to 67028. If bilateral injections are given, either use -50 (bilateral, per payer preference) or two separate line items with -RT and -LT. The drug J/C-code should be billed with the appropriate unit count.