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H20 Iridocyclitis Family MOC

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H20 Iridocyclitis Family MOC

What This MOC Covers

This index covers the complete H20 Iridocyclitis code family in ICD-10-CM — all sub-categories of acute, subacute, recurrent, chronic, secondary, lens-induced, and hypopyon-level iridocyclitis. Use this page to navigate to individual code notes, understand code selection logic, and identify the correct level of specificity for any iridocyclitis encounter.

Full H20 Code Family Tree

H20 Iridocyclitis  
│  
├── H20.0 Acute and Subacute Iridocyclitis  
│ ├── H20.01 Primary Iridocyclitis  
│ │ ├── H20.011 - Right eye  
│ │ ├── H20.012 - Left eye → [[H20.012]]  
│ │ ├── H20.013 - Bilateral → [[H20.013]]  
│ │ └── H20.019 - Unspecified (avoid)  
│ │  
│ ├── H20.02 Recurrent Acute Iridocyclitis  
│ │ ├── H20.021 - Right eye  
│ │ ├── H20.022 - Left eye  
│ │ ├── H20.023 - Bilateral  
│ │ └── H20.029 - Unspecified (avoid)  
│ │  
│ ├── H20.03 Secondary Infectious Iridocyclitis  
│ │ ├── H20.031 - Right eye  
│ │ ├── H20.032 - Left eye  
│ │ ├── H20.033 - Bilateral  
│ │ └── H20.039 - Unspecified (avoid)  
│ │  
│ ├── H20.04 Secondary Noninfectious Iridocyclitis  
│ │ ├── H20.041 - Right eye  
│ │ ├── H20.042 - Left eye  
│ │ ├── H20.043 - Bilateral  
│ │ └── H20.049 - Unspecified (avoid)  
│ │  
│ └── H20.05 Hypopyon  
│ ├── H20.051 - Right eye → [[H20.051]]  
│ ├── H20.052 - Left eye  
│ ├── H20.053 - Bilateral  
│ └── H20.059 - Unspecified (avoid)  
│  
├── H20.1 Chronic Iridocyclitis  
│ ├── H20.11 - Right eye  
│ ├── H20.12 - Left eye  
│ ├── H20.13 - Bilateral  
│ └── H20.19 - Unspecified (avoid)  
│  
├── H20.2 Lens-Induced Iridocyclitis  
│ ├── H20.21 - Right eye  
│ ├── H20.22 - Left eye  
│ ├── H20.23 - Bilateral  
│ └── H20.20 - Unspecified (avoid)  
│  
├── H20.8 Other Iridocyclitis  
│ ├── H20.81x Fuchs' heterochromic cyclitis  
│ │ ├── H20.811 - Right eye  
│ │ ├── H20.812 - Left eye  
│ │ ├── H20.813 - Bilateral  
│ │ └── H20.819 - Unspecified  
│ ├── H20.82x Vogt-Koyanagi syndrome  
│ │ ├── H20.821 - Right eye  
│ │ ├── H20.822 - Left eye  
│ │ ├── H20.823 - Bilateral  
│ │ └── H20.829 - Unspecified  
│ └── H20.89 Other iridocyclitis  
│  
└── H20.9 Unspecified Iridocyclitis (avoid)

Code Selection Logic

Step 1 — Determine Onset/Course Type

Clinical PresentationCorrect Sub-Category
First episode, acute/subacute, no prior historyH20.01x Primary iridocyclitis
Recurrent episodes with documented disease-free intervals of 3+ months off treatmentH20.02x Recurrent acute iridocyclitis
Persistent inflammation 3+ months, or relapse within 3 months of stopping treatmentH20.1x Chronic iridocyclitis
Identified infectious etiology (NOT an Excludes1 cause — see below)H20.03x Secondary infectious iridocyclitis
Identified noninfectious systemic cause (NOT an Excludes1 cause)H20.04x Secondary noninfectious iridocyclitis
Lens-induced uveitis (phacoantigenic, phacolytic)H20.2x Lens-induced iridocyclitis
Hypopyon present (layered WBCs in inferior AC)H20.05x Hypopyon — use as primary inflammatory code; see Step 3
Fuchs’ heterochromic cyclitisH20.81x
Vogt-Koyanagi syndromeH20.82x

Step 2 — Determine Laterality

Always code the most specific laterality available. Never default to unspecified when the chart documents which eye is affected.

Eye Affected5th Digit
Right eye1
Left eye2
Bilateral3
Unspecified — avoid9

Step 3 — Hypopyon Sequencing

When hypopyon is present, it represents the most severe level of the inflammatory episode.

  • Use H20.05x (hypopyon) as the primary iridocyclitis code.
  • Add the appropriate H20.01x-H20.04x as a secondary code for context when clinically relevant.
  • When hypopyon resolves, transition back to the appropriate H20.01x-H20.04x code at subsequent visits — do not continue coding H20.05x after the hypopyon has cleared.

Step 4 — Check Excludes1 for Documented Systemic Cause

The following systemic and infectious conditions replace H20.0x-H20.9 when they are the documented cause of iridocyclitis. These are Excludes1 — do not code H20.0x alongside them:

ConditionReplace H20.0x With
Herpes simplex uveitisB00.51
Herpes zoster uveitisB02.32
Syphilis (acute)A51.43
Late syphilisA52.71
Late congenital syphilisA50.39
sarcoidosisD86.83
TuberculosisA18.54
ToxoplasmosisB58.09
Diabetes mellitusE08-E13 with .39 suffix
GonococcalA54.32
DiphtheriaA36.89

Step 5 — Code Also Underlying Systemic Disease (Non-Excludes1)

When the iridocyclitis is associated with a systemic condition that does NOT have an Excludes1 redirect, code both the H20.0x code AND the systemic condition:

Systemic ConditionCode Also
Ankylosing spondylitisM45.-
Psoriatic arthritisL40.5x
Reactive arthritisM02.-
IBD (Crohn/UC)K50-K51.-
Behcet diseaseM35.2
JIAM08.-
Multiple sclerosisG35
Lyme diseaseA69.2x

Excludes1 Reference — Full List at H20 Level

These conditions are Excludes1 at the H20 category level. Do not code H20.x alongside these when they are the documented etiology — use the disease-specific code instead:

  • Iridocyclitis in diabetes mellitus → E08-E13 with .39 suffix
  • Iridocyclitis in diphtheria → A36.89
  • Iridocyclitis in gonococcal infection → A54.32
  • Iridocyclitis in herpes simplex → B00.51
  • Iridocyclitis in herpes zoster → B02.32
  • Iridocyclitis in late congenital syphilis → A50.39
  • Iridocyclitis in late syphilis → A52.71
  • Iridocyclitis in sarcoidosis → D86.83
  • Iridocyclitis in syphilis → A51.43
  • Iridocyclitis in toxoplasmosis → B58.09
  • Iridocyclitis in tuberculosis → A18.54

Endophthalmitis vs. Hypopyon — Critical Distinction

This is one of the highest-stakes coding distinctions in the H20 family:

ScenarioCorrect Code
Hypopyon from severe iridocyclitis (non-infectious or non-Excludes1)H20.05x
Hypopyon from bacterial endophthalmitisH44.001-H44.003 (purulent endophthalmitis)
Hypopyon from panophthalmitisH44.011-H44.013
Ambiguous documentationClarify with provider before coding

Clinical tip: Endophthalmitis hypopyon is typically more severe, associated with severe vitritis and posterior involvement, often post-surgical or post-injection. Iridocyclitis hypopyon is typically anterior chamber confined. Documentation should reflect the clinical distinction.

Acute vs. Recurrent vs. Chronic — Quick Reference

Code FamilyUse When
H20.01x Primary iridocyclitisFirst or new episode; no prior documented recurrence pattern
H20.02x Recurrent acute iridocyclitisDocumented recurrent episodes with 3+ month disease-free intervals off treatment
H20.1x Chronic iridocyclitisPersistent inflammation 3+ months OR relapse within 3 months of stopping treatment

Coding note: JIA-associated uveitis is commonly chronic and often asymptomatic — the clinician’s documentation of chronicity should drive code selection toward H20.1x in established JIA uveitis patients.

HCC Quick Reference for H20 Family

No H20 code directly maps to a CMS-HCC. HCC weight comes from underlying systemic conditions:

Systemic ConditionHCC
Ankylosing spondylitis (M45.-)HCC 40
Psoriatic arthritis (L40.5x)HCC 40
JIA (M08.-)HCC 40
IBD (K50-K51)HCC 35
Multiple sclerosis (G35)HCC 77
Behcet disease (M35.2)HCC 40

Always code confirmed systemic comorbidities for full CDI and RAF accuracy.

MS-DRG Reference for H20 Family

When H20.x is the principal diagnosis for an inpatient admission:

DRGDescriptionWhen
DRG 124Other disorders of the eye with MCCH20.x principal + documented MCC
DRG 125Other disorders of the eye without MCCH20.x principal, no MCC

When the systemic disease is the principal admission diagnosis, that condition’s MDC/DRG applies — H20.x is secondary.

Inpatient admission for iridocyclitis alone is uncommon. Most H20.x encounters are managed outpatient.

Associated CPT Codes — Quick Reference

Ophthalmological Exams

CPTDescription
92002New patient, intermediate
92004New patient, comprehensive
92012Established patient, intermediate
92014Established patient, comprehensive

Diagnostic Testing

CPTDescription
92250Fundus photography
92132Anterior segment OCT
92134OCT retina (if CME or posterior involvement)
92020Gonioscopy

Procedures

CPTDescription
65800Paracentesis of anterior chamber (AC tap)
67028Intravitreal injection (e.g., triamcinolone)
68200Subconjunctival injection (periocular steroid)

Common Documentation Failures — Audit Tips

  • Unspecified laterality — always document which eye; H20.x19/029/039/049/059/19 unspecified codes should be avoided when laterality is known.
  • Failing to transition codes — once hypopyon resolves, stop coding H20.05x and transition to H20.01x-H20.04x at follow-up.
  • Using H20.0x when Excludes1 applies — if herpes, sarcoid, TB, or syphilis is the confirmed etiology, the H20.0x code must not be used.
  • Missing the underlying systemic disease — failing to code ankylosing spondylitis, Behcet, JIA, IBD, etc. alongside H20.0x leaves HCC weight, CDI accuracy, and clinical story incomplete.
  • Using primary iridocyclitis when pattern is recurrent or chronic — H20.01x is for new or non-recurrent episodes; document and code the recurrence pattern (H20.02x) or chronicity (H20.1x) when applicable.
  • Failing to add H20.05x when hypopyon is documented — hypopyon is a billable, severity-defining finding and should always be coded when present.

Modifiers Commonly Used with H20 Family Encounters

ModifierUse Case
-25Same-day E/M + procedure (e.g., exam + AC tap, exam + injection)
-50Bilateral procedure on same day
-RT / -LTUnilateral procedures — right or left eye
-24Unrelated E/M during post-operative global period
-57Decision for surgery made at E/M visit
-78Unplanned return to OR for complication within global period

Individual Code Notes in This Vault

CodeDescriptionNote
H20.011Primary iridocyclitis, right eye(create note)
H20.012Primary iridocyclitis, left eyeH20.012
H20.013Primary iridocyclitis, bilateralH20.013
H20.051Hypopyon, right eyeH20.051
H20.052Hypopyon, left eye(create note)
H20.053Hypopyon, bilateral(create note)

Suggested Obsidian Linkouts

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