peripheral ulcerative keratitis

Definition of peripheral ulcerative keratitis

peripher-kerat--itis ulcer- — Inflammatory destruction of the peripheral cornea (immune-mediated corneal melt at the limbus)

1. Peripheral ulcerative keratitis (PUK) is a rare but sight- and life-threatening inflammatory disorder of the juxtalimbal cornea — the narrow zone of peripheral cornea immediately adjacent to the limbus — characterized by its hallmark triad of epithelial defects, progressive stromal lysis, and a crescent-shaped (arcuate) zone of corneal thinning that advances centrally if untreated and can result in corneal perforation; the underlying pathophysiology centers on the unique anatomy of the peripheral cornea, where limbal capillary arcades allow high-molecular-weight immune complexes (IgM, C1 complement component) to deposit in the corneal stroma, triggering complement activation → chemotaxis of neutrophils and macrophages → release of collagenases, matrix metalloproteinases (MMP-2, MMP-9), and proteases that literally dissolve corneal stroma; the most important clinical context is its strong association with systemic autoimmune disease — approximately 34-42% of cases are associated with rheumatoid arthritis, with granulomatosis with polyangiitis (GPA/Wegener’s), systemic lupus erythematosus, relapsing polychondritis, polyarteritis nodosa, and inflammatory bowel disease accounting for most of the remainder; critically, when PUK occurs in a patient with RA, it signals systemic vasculitis with significantly elevated morbidity and 10-year mortality — making PUK both an ophthalmologic and systemic emergency requiring immediate rheumatology co-management; the idiopathic subset with no identifiable systemic etiology is termed Mooren’s ulcer, which by definition is a diagnosis of exclusion; incidence is estimated at approximately 3 per million per year.

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Etymology of peripheral ulcerative keratitis

greek latin • peripher-: Greek periphereia (περιφέρεια) = “carrying around, circumference, periphery” (from peri- = around + pherein = to carry); refers to the outer boundary of the cornea near the limbus. • kerat-: Greek keras (κέρας) = “horn” → applied to the cornea because of its tough, horn-like translucent structure. • ulcer-: Latin ulcus (genitive ulceris) = “a sore, an open wound”; implies a defect with tissue breakdown extending into the stroma. • -itis: Greek -itis = “inflammation of”; denotes an active inflammatory process. • Literal: “Inflammation and ulceration of the peripheral cornea” — a composite anatomical and pathological descriptor coined in 20th-century corneal subspecialty literature to distinguish this limbus-adjacent destructive inflammatory process from central corneal ulcers and from non-ulcerative peripheral keratitis.

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Classification Table

Type	Etiology	Key Features
RA-associated PUK	Rheumatoid arthritis (most common; 34-42%)	Signals systemic vasculitis; high mortality risk; bilateral in advanced disease
GPA-associated PUK	Granulomatosis with polyangiitis (Wegener’s)	May be presenting feature in up to 60%; often with necrotizing scleritis; poor visual prognosis
SLE-associated PUK	Systemic lupus erythematosus	Associated with systemic flares; sclerokeratitis common
Infectious PUK	Bacterial, viral (HSV, HZV), fungal, parasitic (Acanthamoeba), contact lens-related	Requires targeted antimicrobial therapy; culture-directed; avoid steroids until infection controlled
Mooren’s ulcer	Idiopathic (diagnosis of exclusion)	No systemic disease; two subtypes: unilateral (older patients, more responsive to treatment) and bilateral (younger patients, aggressive course)
Post-surgical / traumatic PUK	Prior ocular surgery, corneal trauma	Less common; local inflammatory trigger

Coding Context

ICD-10-CM (7th character NOT required for H16.0x — 6-character codes with laterality):

Code	Description
H16.081	Peripheral corneal ulcer, right eye
H16.082	Peripheral corneal ulcer, left eye
H16.083	Peripheral corneal ulcer, bilateral
H16.089	Peripheral corneal ulcer, unspecified eye
H16.001	Unspecified corneal ulcer, right eye (use when PUK not specified as peripheral in documentation)
H16.002	Unspecified corneal ulcer, left eye
H16.003	Unspecified corneal ulcer, bilateral

Companion / Systemic Disease Codes (Sequence Underlying Condition Per ICD-10-CM Instructions):

Code	Description
M05.811	Rheumatoid arthritis with rheumatoid factor of right shoulder (representative; use site-appropriate M05.8xx)
M06.00	Rheumatoid arthritis without rheumatoid factor, unspecified site (seronegative RA-associated PUK)
M31.30	Wegener’s granulomatosis without renal involvement (GPA-associated PUK)
M31.31	Wegener’s granulomatosis with renal involvement
M32.9	Systemic lupus erythematosus, unspecified (SLE-associated PUK)
M35.1	Other overlap syndromes (mixed connective tissue disease with PUK)
H15.041	Scleritis with corneal involvement, right eye (when necrotizing scleritis co-occurs with PUK)
H15.042	Scleritis with corneal involvement, left eye
H15.043	Scleritis with corneal involvement, bilateral

Complication Codes:

Code	Description
H18.891	Other specified disorders of cornea, right eye (corneal perforation from advanced PUK when not captured by ulcer code)
H18.892	Other specified disorders of cornea, left eye
H59.891	Other intraoperative complications of eye and adnexa (surgical complication codes for corneal gluing/keratoplasty)

Causes and Risk Factors

• Systemic autoimmune (most common): Rheumatoid arthritis (~34-42%), granulomatosis with polyangiitis (GPA), SLE, relapsing polychondritis, polyarteritis nodosa, Crohn’s disease, ulcerative colitis
• Infectious: Bacterial (Staphylococcus, Pseudomonas, Moraxella), HSV/HZV, fungal (Fusarium, Candida), Acanthamoeba (contact lens contamination), parasitic
• Local/ocular: Rosacea, Mooren’s ulcer (idiopathic), prior corneal surgery, exposure keratopathy, contact lens-related
• Risk amplifiers: Dry eye disease (impairs epithelial barrier), prior limbal damage, immunosuppression (increases infectious risk), limbal stem cell deficiency
• Life-threatening red flag: PUK in RA patient = likely systemic vasculitis → associated 10-year mortality significantly elevated; mandatory systemic workup and rheumatology referral

Related Terms

• limbus — the corneoscleral border; the anatomic site of PUK; limbal capillary arcades are the site of immune complex deposition
• Mooren’s ulcer — idiopathic PUK; diagnosis of exclusion when all systemic causes excluded; H16.081-H16.083
• keratitis — general inflammation of cornea; PUK is a specific subtype targeting the peripheral zone; broad parent code H16
• scleritis — inflammation of the sclera; frequently co-occurs with PUK, especially in GPA and RA; necrotizing scleritis + PUK = vasculitic emergency; H15.0x
• episcleritis — superficial scleral inflammation; milder than scleritis; distinct but related differential; H15.10-H15.12
• rheumatoid arthritis — most common systemic association (~34-42% of PUK); M05.x/M06.x
• granulomatosis with polyangiitis (GPA) — second most common; PUK may be presenting sign; M31.30/M31.31
• corneal perforation — end-stage complication of untreated PUK; surgical emergency; H18.891
• conjunctival resection — surgical removal of perilimbal conjunctiva to remove inflammatory mediator reservoir; CPT 68110/68115
• keratoplasty — corneal transplantation for severe PUK with corneal melt or perforation; CPT 65730/65750/65755
• amniotic membrane transplantation — biological scaffold placed over denuded peripheral cornea to promote healing; CPT 65778
• cyanoacrylate glue — tissue adhesive applied to impending corneal perforation in PUK; CPT 66999 (unlisted ophthalmic procedure)
• matrix metalloproteinases (MMPs) — MMP-2 and MMP-9; enzymes released by macrophages/keratocytes causing stromal collagen breakdown in PUK
• methotrexate — first-line systemic cytotoxic agent for autoimmune PUK (RA-associated); disease-modifying
• rituximab — anti-CD20 biologic; used for maintenance therapy in GPA-associated and refractory PUK; HCPCS J9312

Clinical Details

Assessment: Slit-lamp exam showing crescent-shaped epithelial defect + stromal thinning at peripheral cornea adjacent to limbus; fluorescein staining delineates epithelial defect; corneal scraping + culture at initial presentation to rule out infectious etiology; ANCA, ANA, RF, anti-CCP, CBC, CMP, chest X-ray, urinalysis for systemic workup Symptoms: Ocular pain, redness, photophobia, tearing, decreased vision; may be painless in RA patients with peripheral neuropathy — a deceptive presentation Management: Infectious PUK → targeted antimicrobials (4th-gen fluoroquinolone empirically); Noninfectious PUK → preservative-free lubricants, oral doxycycline (anti-collagenase), Vitamin C 500-1000 mg/day (collagen synthesis support), systemic corticosteroids (prednisone), MTX or azathioprine; refractory → cyclophosphamide or rituximab; surgical → conjunctival resection, cyanoacrylate glue for impending perforation, amniotic membrane, keratoplasty (last resort) Emergency flag: Corneal perforation from stromal melt = surgical emergency requiring emergent corneal gluing or penetrating keratoplasty (PK)

One-Sentence Summary Peripheral ulcerative keratitis (PUK; H16.081-H16.083; Greek periphereia + keras + Latin ulcus + Greek -itis = “inflammatory ulceration of the peripheral cornea”) is an immune complex-mediated destructive crescentic corneal melt at the juxtalimbal zone most commonly driven by rheumatoid arthritis (~40%) or GPA, managed with systemic immunosuppression (M05.x/M31.30), conjunctival resection (68110), and — when corneal perforation threatens — keratoplasty (65730/65755) or amniotic membrane transplantation (65778).

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DERIVATIONS of peripheral ulcerative keratitis

TABLE definition AS Definition 
WHERE length(filter(roots, (word) => econtains([[peripheral ulcerative keratitis]].roots, word))) > 0 AND file.name != [[peripheral ulcerative keratitis]].file.name
SORT file.name ASC

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Query

TABLE definition AS Definition
FROM #medroot
WHERE length(filter(definition, (word) => econtains([[peripheral ulcerative keratitis]].definition, word))) > 0 AND file.name != [[peripheral ulcerative keratitis]].file.name

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Med roots Appendix A Prefixes Appendix B Combining Forms Appendix C Suffixes Appendix D Suffix forms