Excision is a fundamental surgical procedure involving the sharp, deliberate removal of tissue, a mass, or a specific anatomical structure. Clinically, an excision implies that the surgeon is cutting around and under the target tissue to remove it completely from its surrounding bed, often with the intent of sending the intact specimen to pathology for histological examination. In dermatology and oncology, excisions usually include a “margin” of healthy tissue to ensure that no diseased cells (like melanoma or basal cell carcinoma) remain.
-cis- (Latin caedere or cisum): root meaning “to cut.”
-ion (Latin -io): suffix denoting an action, process, or state.
Literal Meaning: The act or process of cutting out.
Coding & Documentation Nuances
ICD-10-PCS (Inpatient Coding): * The Golden Rule of PCS: Excision vs. Resection. In PCS, Excision is defined strictly as cutting out or off, without replacement, a portion of a body part (e.g., a lumpectomy, a wedge biopsy of the liver, or removal of a single lobe of the thyroid). If the surgeon removes the entire body part (e.g., a total thyroidectomy or total cholecystectomy), the Root Operation is Resection, regardless of whether the physician called it an “excision” in their note.
Biopsy: If the excision is performed solely for diagnostic purposes, the qualifier “Diagnostic” (X) is used in the 7th character position.
CPT (Current Procedural Terminology): * Benign vs. Malignant: CPT heavily divides integumentary excisions by the pathology of the lesion (benign vs. malignant). You often must wait for the pathology report before finalizing the code.
Measuring for CPT: The coded size is determined by taking the maximum clinical diameter of the lesion plus the narrowest margins required for complete excision (Lesion size + margin + margin = total excised diameter).
Closure Rules: Simple closure is included in the excision code. However, if an intermediate or complex closure is required to repair the surgical defect, it is coded separately.
Clinical Indicators
To accurately code an excision, a coder should look for the following in the operative report:
Method of Removal: Clear documentation of sharp dissection (e.g., scalpel, electrosurgical needle, scissors) cutting entirely through the dermis or deep tissue.
Intent of Margins: Mentions of “elliptical incision,” “margins taken,” or “oriented with sutures for pathology.”
Pathology Submission: The specimen is almost always sent to surgical pathology (unlike destructive methods, where nothing is left to send).
Measurements: Pre-excision measurements of the lesion and the planned margins in centimeters (vital for outpatient/CPT coding).
Extent of Removal: To determine if it’s an ICD-10-PCS Excision or Resection, look for language indicating whether a part of the organ or the whole organ was taken.
Related Terms & Differentials
resection: (PCS specific) The removal of an entire body part. If a surgeon does a “partial gastrectomy,” it’s an excision. If they do a “total gastrectomy,” it’s a Resection.
Destruction: Eradicating tissue by means other than sharp excision, such as laser, liquid nitrogen (cryosurgery), or electrocautery. There is no tissue left to send to pathology.
Shaving: The horizontal slicing of an epidermal or dermal lesion. It does not go through the full thickness of the dermis into the subcutaneous fat, making it clinically and fundamentally different from an excision.
Extirpation: A PCS Root Operation meaning taking or cutting out solid matter from a body part (e.g., removing a blood clot, a bullet, or a gallstone). You are removing matter from the body part, not the body part itself.
Extraction: Pulling or stripping out a portion or all of a body part (e.g., pulling a tooth, stripping a varicose vein). It implies force or pulling rather than sharp cutting.
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