keratectomy is the surgical excision or removal of a portion of the cornea, typically performed to treat superficial corneal diseases, scars, or dystrophies. It is distinguished from a keratotomy (which is an incision into the cornea without tissue removal) and a keratoplasty (which involves full or partial-thickness corneal transplantation). The procedure can be performed mechanically using a surgical blade (superficial keratectomy) or via an excimer laser (phototherapeutic keratectomy, or PTK). Pathological indications often include anterior basement membrane dystrophy (ABMD), band keratopathy, or recurrent corneal erosions that have failed conservative management. It is commonly confused with photorefractive keratectomy (PRK), which uses similar laser technology but is performed for refractive (vision-correcting) purposes rather than therapeutic disease management.
Keratectomic(adjective form — e.g., “keratectomic defect,” “post-keratectomic healing”)
Corneal excision(lay and clinical synonym; often used in general surgical operative reports)
Epithelial debridement(partial or incomplete form of the condition; involves removal of only the outermost epithelial layer without stromal excision)
Superficial keratectomy (SK)(clinical synonym used in specific context — mechanical removal of the corneal epithelium and anterior stroma; coded under 65400)
Phototherapeutic keratectomy (PTK)(laser-assisted form; used for therapeutic removal of diseased corneal tissue; S0812)
Photorefractive keratectomy (PRK)(refractive/cosmetic form; reshapes the cornea to correct myopia, hyperopia, or astigmatism; S0810)
Mechanical keratectomy(define by cause — performed with a surgical blade, diamond burr, or forceps rather than a laser)
Chelation keratectomy(define by cause — performed with EDTA application specifically to remove calcium deposits in band keratopathy)
Central keratectomy(organ/tissue-specific form — excision focused on the visual axis of the cornea)
Peripheral keratectomy(organ/tissue-specific form — excision focused on the outer margins of the cornea, often for Salzmann nodules)
đź”— RELATED TERMS
Keratotomy — the opposite/alternative to keratectomy; an incision into the cornea without the removal of tissue, often used for relaxing astigmatism.
Keratoplasty — shares the kerato- root; involves the surgical replacement or transplantation of corneal tissue rather than mere excision.
Epithelial Debridement — removal of only the corneal epithelium (CPT 65435); distinguished from true keratectomy (CPT 65400) which requires removal of subepithelial tissue (Bowman’s layer or stroma).
corneal dystrophy — genetic, progressive condition characterized by abnormal material accumulation in the cornea; a primary indication for PTK or SK (e.g., H18.5x).
ablation — the physiological mechanism or process of removing tissue, often via excimer laser in PTK/PRK.
Ablative — adjective describing laser inputs that vaporize or remove tissue; e.g., “ablative phototherapy.”
Epithelialization — cellular mechanism of healing and regrowth of the corneal surface following a keratectomy.
Recurrent Corneal Erosion — acquired disease entity characterized by repeated breakdown of the corneal epithelium; often treated with SK or PTK (H18.83x).
Band Keratopathy — disease entity featuring calcium deposition in the superficial cornea; often treated with keratectomy and EDTA chelation (H18.46x).
Salzmann Nodular Degeneration — disease entity featuring bluish-white nodules on the cornea, frequently requiring superficial keratectomy (H18.42x).
Slit-Lamp Examination — primary diagnostic procedure associated with evaluating the cornea prior to and following keratectomy.
CODING CORNER
🏥 ICD-10-CM CODES
Corneal Scars and Opacities (H17.x — Laterality Required)
Ocular surface reconstruction; amniotic membrane transplantation, multiple layers (often used adjunctively with extensive keratectomy)
⚠️ Coding Note: For Noridian MAC (JE/JF) billing, strict attention must be paid to the depth of tissue removed to distinguish between CPT 65400 and 65435. If the operative report describes removal of only the epithelium (e.g., “epithelial debridement”), code 65435 must be used; CPT 65400 requires documentation of excision extending into Bowman’s layer or the corneal stroma. An undercoding/overcoding alert frequently arises with band keratopathy: if EDTA chelation is used to remove the calcium deposits, CPT 65436 is the most accurate code, not 65400. When coding Phototherapeutic Keratectomy (PTK), use HCPCS S0812 rather than an unlisted CPT code; however, ensure the diagnosis meets Noridian’s Local Coverage Determination (LCD) criteria for medical necessity (e.g., recurrent corneal erosion failing conservative therapy, or specific dystrophies), as PRK (S0810) is statutorily excluded from Medicare coverage as cosmetic refractive surgery. Always append laterality modifiers (-RT, -LT, or -50 for bilateral) to both the CPT/HCPCS and ICD-10-CM codes.