Crystal's MCW Coder Hub🧬 ICD-10-CM H44.131 — Sympathetic Uveitis, Right Eye
Billable Code Confirmed — 6 Characters Complete
H44.131 is a valid, billable 6-character ICD-10-CM code for FY2025/2026. [web:307][web:308] No additional characters available or required — complete as written.
🚨 VAULT CORRECTION — H44.13 Is NOT Parasitic Endophthalmitis
H44.002 cross-reference incorrectly listed H44.13x as “Parasitic endophthalmitis — cysticercosis.” This is wrong. Correct H44.1 subcategory map: [web:309][web:312]
- H44.11x = Panuveitis
- H44.12x = Parasitic endophthalmitis, unspecified
- H44.13x = Sympathetic Uveitis ← this family
- H44.19x = Other endophthalmitis
Excludes1 — Bleb-Associated Endophthalmitis → H59.4- Only
H44.1 Excludes1: bleb associated endophthalmitis (H59.4-) [web:309][web:313] Cannot code H44.131 for bleb-related inflammation.
Excludes2 — Ophthalmia Nodosa Is a Separate Condition
H44.1 Excludes2: ophthalmia nodosa (H16.2-) [web:309][web:313] Caterpillar hair/foreign body conjunctivitis/uveitis — different entity, different code, may coexist separately.
🔍 Code Description
H44.131 classifies sympathetic uveitis of the right eye — a bilateral, granulomatous panuveitis that develops in the uninjured fellow eye (the sympathizing eye) following penetrating injury or surgery to the other eye (the exciting eye). It is one of the most dramatic and medically significant bilateral eye conditions in ophthalmology — a T-cell mediated autoimmune reaction to exposed uveal antigens in which the immune system, sensitized by the injured eye, attacks the healthy fellow eye as well.
The condition is rare but devastating — untreated, it causes progressive bilateral vision loss and blindness. The term “sympathetic” refers to the healthy eye developing inflammation in sympathy with the injured one. H44.131 codes the right eye — which may be either the exciting eye (the injured one) or the sympathizing eye (the healthy one that developed uveitis in response). Both eyes can and often should be coded simultaneously.
🔑 Exciting Eye vs. Sympathizing Eye — The Core Concept
Understanding the Two-Eye Dynamic
Sympathetic uveitis involves two eyes with two distinct roles: [web:307][web:308]
| Role | Name | What Happened | Typical Code |
|---|---|---|---|
| The injured/operated eye | Exciting eye | Penetrating trauma or surgery → uveal pigment exposed → immune sensitization | H44.131 or H44.132 (whichever is the injured eye) |
| The healthy fellow eye | Sympathizing eye | Immune system attacks it too — bilateral granulomatous uveitis develops | H44.132 or H44.131 (the other eye) |
| Both | Bilateral | Both eyes inflamed simultaneously | H44.133 — bilateral |
Which Eye Is Which — Laterality Coding Rule
H44.131 right eye = right eye has sympathetic uveitis — whether it’s the exciting eye or the sympathizing eye, the laterality codes THE EYE BEING DIAGNOSED, not its role in the syndrome.
When both eyes are documented with sympathetic uveitis:
- Option A: H44.133 — bilateral (most efficient when both eyes documented equally)
- Option B: H44.131 + H44.132 — code each eye separately when stage, severity, or treatment differs between eyes
Always code the injury/surgery to the exciting eye as an additional code to document the causative event.
🌳 Code Tree — H44.1 Other Endophthalmitis (Corrected)
H44.1 Other Endophthalmitis ❌ Non-billable header
Excludes1: bleb associated endophthalmitis (H59.4-)
Excludes2: ophthalmia nodosa (H16.2-)
│
├── H44.11 Panuveitis ❌ Non-billable
│ ├── H44.111 Panuveitis — right eye ✅ Billable
│ ├── H44.112 Panuveitis — left eye ✅ Billable
│ ├── H44.113 Panuveitis — bilateral ✅ Billable
│ └── H44.119 Panuveitis — unspec eye ⚠️ avoid
│
├── H44.12 Parasitic endophthalmitis, unspec ❌ Non-billable
│ ├── H44.121 Parasitic — right eye ✅ Billable
│ ├── H44.122 Parasitic — left eye ✅ Billable
│ ├── H44.123 Parasitic — bilateral ✅ Billable
│ └── H44.129 Parasitic — unspec eye ⚠️ avoid
│
├── H44.13 Sympathetic uveitis ❌ Non-billable
│ ├── H44.131 Sympathetic uveitis — right ◀ THIS CODE ✅
│ ├── H44.132 Sympathetic uveitis — left ✅ Billable
│ ├── H44.133 Sympathetic uveitis — bilat ✅ Billable
│ └── H44.139 Sympathetic uveitis — unspec ⚠️ avoid
│
└── H44.19 Other endophthalmitis ✅ Billable
📊 Pathophysiology — Why Both Eyes Are Affected
Sympathetic uveitis is a T-cell mediated autoimmune disease targeting uveal melanocytes and retinal antigens — specifically, antigens that are normally sequestered from immune surveillance behind the blood-ocular barrier. [web:307] When penetrating trauma or intraocular surgery disrupts this barrier in the exciting eye, previously hidden antigens (particularly melanin-associated proteins and retinal S-antigen/arrestin) are exposed to circulating T-lymphocytes. Sensitized T-cells then traffic to BOTH eyes — breaking immune tolerance in the uninjured sympathizing eye and triggering bilateral granulomatous inflammation.
The Classic Timeline
| Phase | Timeframe | Clinical Event |
|---|---|---|
| Inciting event | Day 0 | Penetrating trauma or intraocular surgery — exciting eye |
| Sensitization period | Days to years | Uveal antigen exposure → T-cell sensitization |
| Earliest risk window | < 2 weeks | Sympathetic uveitis before 2 weeks extremely rare |
| Peak risk window | 2 weeks to 3 months | Highest incidence — ~80% of cases in first year |
| Extended risk | Up to decades | Lifelong risk — cases reported 60+ years post-injury |
| Sympathizing eye uveitis onset | Variable | Bilateral granulomatous uveitis — Dalen-Fuchs nodules |
Lifelong Risk — Never "Safe" After Penetrating Injury
Once uveal antigen exposure has occurred, the risk of sympathetic uveitis is permanent — there is no safe window after which the fellow eye is protected. Cases have been documented decades after the original injury. This is why patients with old penetrating injuries presenting with new uveitis in the fellow eye should always have sympathetic uveitis on the differential, and why coding and documentation of the original injury (S05.x) as historical cause is important.
🔬 Clinical Features — Dalen-Fuchs Nodules and Granulomatous Signs
Hallmark Clinical Findings
| Finding | Clinical Significance |
|---|---|
| Dalen-Fuchs nodules | Pathognomonic — subretinal granulomas between RPE and Bruch’s membrane; creamy-yellow lesions on fundoscopy |
| Mutton-fat KP | Large greasy keratic precipitates — granulomatous inflammation marker |
| Koeppe/Busacca nodules | Iris granulomas — granulomatous anterior uveitis |
| Choroidal thickening | OCT finding — diffuse choroiditis |
| Exudative retinal detachment | Severe cases — subretinal fluid from choroidal inflammation |
| Vitritis | Posterior segment — vitreous cells |
| Disc edema | Optic nerve involvement |
| Peri-papillary yellow-white lesions | Sunset glow fundus in chronic cases |
🚨 Prevention — Evisceration of the Exciting Eye
The Prevention Paradox — Eviscerate Within 2 Weeks or Not At All
The only preventive intervention for sympathetic uveitis is evisceration or enucleation of the exciting eye within 2 weeks of injury — before immune sensitization is complete. [web:307][web:308] After 2 weeks, enucleation of the exciting eye does NOT reliably prevent or halt sympathetic uveitis in the sympathizing eye and is generally no longer recommended for prevention purposes alone.
This creates one of ophthalmology’s most difficult clinical decisions:
- Eye with no visual potential after penetrating injury → strong consideration of early evisceration to prevent sympathetic uveitis in the fellow eye
- Eye with some visual potential → attempt to preserve, accept the (low but real) risk of sympathetic uveitis
- Once sympathetic uveitis has developed → evisceration no longer prevents progression; systemic immunosuppression is the treatment
For coding: when evisceration is performed specifically to prevent sympathetic uveitis, the ICD-10-CM code for the injury (S05.x) + the reason for surgery context (H44.133 or relevant H44.13x) supports the surgical medical necessity.
💊 Treatment — Systemic Immunosuppression
Established sympathetic uveitis requires long-term systemic immunosuppression — not just topical or periocular steroids. [web:307][web:308] This generates important coding implications for long-term medication codes alongside H44.131.
| Treatment | ICD-10-CM Companion Code | Notes |
|---|---|---|
| Oral corticosteroids (prednisone) | Z79.52 — long-term systemic steroids | First-line — high dose, prolonged taper |
| Methotrexate | Z79.899 — other long-term drug use | Steroid-sparing agent |
| Mycophenolate mofetil | Z79.899 | Steroid-sparing agent |
| Cyclosporine | Z79.899 | Calcineurin inhibitor — immunosuppression |
| Adalimumab (Humira) | Z79.899 | Biologic — refractory sympathetic uveitis |
| Azathioprine | Z79.899 | Older steroid-sparing option |
Adverse Effects of Systemic Steroids for Sympathetic Uveitis → T38.0X5A/D
Patients on long-term oral prednisone for sympathetic uveitis are at risk for steroid-induced glaucoma (H40.61x) and steroid-induced PSC cataract (H26.13) — and when these develop, the adverse effect code is T38.0X5A (systemic steroid → T38, NOT T49.5X5A). This is the scenario where T38.0X5A is correct — oral prednisone for autoimmune uveitis is systemic, not topical ophthalmic.
🔗 Related ICD-10-CM Codes
H44.13 Sympathetic Uveitis — Full Code Set
| Code | Description | Use When |
|---|---|---|
| H44.131 | Sympathetic uveitis, right eye ← THIS CODE | Right eye involved |
| H44.132 | Sympathetic uveitis, left eye | Left eye involved |
| H44.133 | Sympathetic uveitis, bilateral | Both eyes — most common presentation |
| H44.139 | Sympathetic uveitis, unspecified eye | ⚠️ Avoid — query laterality |
Causative Event Codes — Always Add
| Code | Description | Relationship |
|---|---|---|
| S05.21xA | Ocular laceration with prolapse, right eye, initial | Penetrating trauma — exciting eye |
| S05.31xA | Ocular laceration without prolapse, right eye, initial | Penetrating trauma — exciting eye |
| T81.4XXA | Infection following procedure | Post-surgical exciting eye |
| Z87.39x | Personal history of prior injury | Historical exciting eye event |
Commonly Coded Alongside H44.131
| Code | Description | Relationship |
|---|---|---|
| H44.132 or H44.133 | Sympathetic uveitis, fellow eye | Bilateral disease — code both eyes when both documented |
| H40.61X_ | Drug-induced glaucoma | Long-term steroid complication → T38.0X5A for systemic steroids |
| H26.13 | PSC cataract | Long-term steroid complication |
| Z79.52 | Long-term systemic steroid use | Prednisone for immunosuppression |
| Z79.899 | Other long-term drug use | Methotrexate, mycophenolate, cyclosporine |
| H54.x | Vision loss / blindness | Outcome coding when applicable |
H44.1 Sibling Codes — Corrected Map
| Code | Description | Not Confused With |
|---|---|---|
| H44.11x | Panuveitis | All uveal layers — no bilateral autoimmune mechanism |
| H44.12x | Parasitic endophthalmitis, unspecified | Toxocara, Toxoplasma, Cysticercosis |
| H44.13x | Sympathetic uveitis ← THIS FAMILY | |
| H44.19x | Other endophthalmitis | Miscellaneous |
💊 Coding Scenarios
Scenario 1 — Penetrating Trauma Right Eye → Sympathetic Uveitis Both Eyes (Outpatient)
Clinical Vignette: A 29-year-old male sustained penetrating trauma to the right eye 6 weeks ago from a metal fragment. Today presents with decreased vision and photophobia bilaterally. Exam: granulomatous anterior uveitis OU — mutton-fat KP, Koeppe nodules. Fundoscopy: Dalen-Fuchs nodules OU, choroidal thickening on OCT OU. Impression: Sympathetic uveitis, bilateral — exciting eye right, sympathizing eye left. Starting high-dose prednisone.
ICD-10-CM:
- H44.133 — Sympathetic uveitis, bilateral (both eyes — bilateral code preferred when both equally documented)
- S05.21xD — Ocular laceration with prolapse, right eye, subsequent encounter (exciting eye — penetrating injury, now subsequent encounter)
- Z79.52 — Long-term systemic steroid use (prednisone started — document immediately)
Use Bilateral Code H44.133 When Both Eyes Equally Affected
When the physician documents sympathetic uveitis affecting both eyes without distinguishing severity between them, H44.133 (bilateral) is more efficient and accurate than coding H44.131 + H44.132 separately. Use the bilateral code as the default when both eyes are involved and documented equally.
Scenario 2 — Sympathetic Uveitis Right Eye — Exciting Eye Left (After Vitrectomy)
Clinical Vignette: A 67-year-old female had PPV left eye for a macular hole 3 months ago. Now presents with new anterior chamber cells and flare OD — the previously unoperated eye. Examination: bilateral granulomatous uveitis — more active in right (sympathizing) eye. Dalen-Fuchs nodules suspected on fundoscopy OD. Impression: Sympathetic uveitis — exciting eye left (post-vitrectomy), sympathizing eye right.
ICD-10-CM:
- H44.131 — Sympathetic uveitis, right eye (sympathizing eye — currently more active)
- H44.132 — Sympathetic uveitis, left eye (exciting eye — also has uveitis)
- T81.4XXD — Complication following procedure, subsequent encounter (post-surgical exciting eye context)
Scenario 3 — Sympathetic Uveitis Right Eye — Long-Term Monitoring (Outpatient Follow-Up)
Clinical Vignette: A 45-year-old male with established bilateral sympathetic uveitis — history of penetrating left eye injury 3 years ago — presents for routine follow-up. Currently on methotrexate and low-dose prednisone taper. Exam: quiet anterior chambers OU, no active Dalen-Fuchs activity, IOP stable. Beginning to notice early PSC lens changes OD — likely steroid-related.
ICD-10-CM:
- H44.131 — Sympathetic uveitis, right eye (ongoing active diagnosis)
- H44.132 — Sympathetic uveitis, left eye (exciting eye — bilateral disease)
- H26.131 — PSC cataract, right eye (new finding — early steroid-induced)
- T38.0X5D — Adverse effect of glucocorticoids, subsequent encounter (oral prednisone causing PSC — systemic steroid → T38, NOT T49)
- Z79.52 — Long-term systemic steroid use
- Z79.899 — Other long-term drug use (methotrexate)
⚠️ Coding Pitfalls and Tips
| Pitfall or Tip | |
|---|---|
| ❌ | H44.13x is NOT parasitic endophthalmitis — that’s H44.12x; H44.131 is sympathetic uveitis [web:309][web:312] |
| ❌ | Never omit the causative event code — penetrating trauma (S05.x) or surgical history is essential context for sympathetic uveitis |
| ❌ | Never use T49.5X5A for steroid complications in sympathetic uveitis — these patients are on SYSTEMIC (oral) steroids → T38.0X5A or T38.0X5D |
| ❌ | Never use H44.131 for bleb-associated inflammation — Excludes1 → H59.4- [web:309][web:313] |
| ❌ | Never avoid the bilateral code when both eyes are documented — H44.133 is more accurate and efficient than coding each eye separately when severity is equal |
| ✅ | Code both eyes — sympathetic uveitis is by definition bilateral; H44.131 alone without H44.132 (or use of H44.133) is clinically incomplete |
| ✅ | Add the exciting eye injury code — S05.x for penetrating trauma; T81.x for post-surgical; historical → Z87.x |
| ✅ | Evisceration within 2 weeks = prevention; after 2 weeks = not prevention — know this for CIC |
| ✅ | Dalen-Fuchs nodules = pathognomonic — when documented, H44.13x is confirmed |
| ✅ | Long-term immunosuppression codes — Z79.52 for steroids, Z79.899 for steroid-sparing agents; always add when documented |
| ✅ | T38.0X5D (not T49) for steroid adverse effects in these patients — oral prednisone is systemic, not ophthalmic |
📚 Sources
1. AAPC Codify. “H44.131 — Sympathetic uveitis, right eye.” H44.1 Other endophthalmitis subcategory confirmed: H44.11 Panuveitis, H44.12 Parasitic endophthalmitis, H44.13 Sympathetic uveitis. Excludes1: bleb associated (H59.4-). Excludes2: ophthalmia nodosa (H16.2-). [web:307][web:309][web:313]
2. ICDList.com. “H44.131 — Sympathetic uveitis, right eye. Billable, valid FY2025/2026.” H44.13 subcategory: H44.131 right, H44.132 left, H44.133 bilateral, H44.139 unspecified. [web:308][web:312]
3. Unbound Medicine ICD-10-CM. “H44.13 — Sympathetic uveitis. H44.1 Other endophthalmitis hierarchy confirmed.” [web:310][web:314]
4. ICD-10-CM Official Guidelines for Coding and Reporting, FY2025. Section I.B — Laterality: code laterality to the highest degree of specificity; bilateral codes when both eyes documented.
5. EyeWiki, AAO. Sympathetic Ophthalmia clinical overview — T-cell autoimmune mechanism, exciting/sympathizing eye terminology, Dalen-Fuchs nodules, evisceration within 2 weeks for prevention, systemic immunosuppression treatment protocol. (Clinical reference — not web-cited above but standard ophthalmology reference.)