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Official Description

Excision, malignant lesion including margins, trunk, arms, or legs; excised diameter 0.5 cm or less

© Copyright 2025 American Medical Association. All rights reserved.

Common Language Description

The CPT® Code 11600 refers to the excision of a malignant lesion located on the trunk, arms, or legs, where the excised diameter of the lesion is 0.5 cm or less. This procedure involves the surgical removal of the malignant tissue along with a margin of healthy tissue to ensure complete excision of the cancerous cells. Common types of malignant lesions that may be excised using this code include basal cell carcinoma, squamous cell carcinoma, verrucous carcinoma, and melanoma. The procedure begins with the cleansing of the area and the administration of a local anesthetic to minimize discomfort during the excision. A full-thickness incision is made through the dermis, encircling the lesion to remove it entirely. To confirm that the excised margins are free of malignant cells, a frozen section may be performed during the procedure. If any malignant tissue is detected at the margins, additional tissue will be excised until clear margins are achieved. The excised lesion is then sent to a laboratory for histologic evaluation, which is separately reportable. Hemostasis is achieved through electrocautery or chemical cautery, and the surgical wound may be closed using a simple single-layer suture technique. In some cases, more complex closure methods such as intermediate (layer) closure, complex repair, skin grafts, or pedicle flaps may be employed. This code is specifically designated for lesions with an excised diameter of 0.5 cm or less, with additional codes available for larger excised diameters.

© Copyright 2025 Coding Ahead. All rights reserved.

1. Indications

The procedure associated with CPT® Code 11600 is indicated for the excision of malignant lesions on the trunk, arms, or legs. The specific conditions or symptoms that may warrant this procedure include:

  • Basal Cell Carcinoma - A common form of skin cancer that typically appears as a small, shiny bump or a sore that does not heal.
  • Squamous Cell Carcinoma - A type of skin cancer that may present as a firm, red nodule or a flat lesion with a scaly, crusted surface.
  • Verrucous Carcinoma - A variant of squamous cell carcinoma that is characterized by a warty appearance and is often found in the oral cavity or on the skin.
  • Melanoma - A serious form of skin cancer that develops from melanocytes and can appear as a new or changing mole.

2. Procedure

The procedure for excising a malignant lesion as described by CPT® Code 11600 involves several critical steps:

  • Step 1: Preparation - The area surrounding the malignant lesion is thoroughly cleansed to reduce the risk of infection. A local anesthetic is then injected to numb the area, ensuring the patient experiences minimal discomfort during the procedure.
  • Step 2: Incision - A full-thickness incision is made through the dermis, carefully encircling the lesion. This incision is designed to include a margin of healthy tissue surrounding the malignant area to ensure complete removal of cancerous cells.
  • Step 3: Excision - The entire lesion, along with the surrounding healthy tissue, is excised. This step is crucial for achieving clear margins, which are necessary to confirm that all malignant cells have been removed.
  • Step 4: Frozen Section Analysis - At this point, a frozen section may be performed to evaluate the margins of the excised tissue. This involves sending a small portion of the tissue to the laboratory for immediate analysis to check for the presence of malignant cells at the margins.
  • Step 5: Additional Excision (if necessary) - If malignant tissue is detected at the margins during the frozen section analysis, additional tissue will be excised until clear margins are confirmed, ensuring that all cancerous cells are removed.
  • Step 6: Hemostasis - Once the lesion is excised, any bleeding is controlled using electrocautery or chemical cautery to promote hemostasis and minimize blood loss.
  • Step 7: Wound Closure - The surgical wound may be closed using a simple single-layer suture technique. However, if the wound is complex, other closure methods such as intermediate (layer) closure, complex repair, skin grafts, or pedicle flaps may be utilized to ensure proper healing.

3. Post-Procedure

After the excision procedure, patients are typically monitored for any immediate complications. Post-procedure care may include instructions on wound care to prevent infection and promote healing. Patients may be advised to keep the area clean and dry, and to watch for signs of infection such as increased redness, swelling, or discharge. Follow-up appointments may be scheduled to assess the healing process and to discuss the results of the histologic evaluation of the excised tissue. It is important for patients to adhere to any prescribed follow-up care to ensure optimal recovery and to address any further treatment needs based on the pathology results.

Short Descr EXC TR-EXT MAL+MARG 0.5 CM/<
Medium Descr EXCISION MAL LESION TRUNK/ARM/LEG 0.5 CM/<
Long Descr Excision, malignant lesion including margins, trunk, arms, or legs; excised diameter 0.5 cm or less
Status Code Active Code
Global Days 010 - Minor Procedure
PC/TC Indicator (26, TC) 0 - Physician Service Code
Multiple Procedures (51) 2 - Standard payment adjustment rules for multiple procedures apply.
Bilateral Surgery (50) 0 - 150% payment adjustment for bilateral procedures does NOT apply.
Physician Supervisions 09 - Concept does not apply.
Assistant Surgeon (80, 82) 1 - Statutory payment restriction for assistants at surgery applies to this procedure...
Co-Surgeons (62) 0 - Co-surgeons not permitted for this procedure.
Team Surgery (66) 0 - Team surgeons not permitted for this procedure.
Diagnostic Imaging Family 99 - Concept Does Not Apply
APC Status Indicator Procedure or Service, Multiple Reduction Applies
ASC Payment Indicator Office-based surgical procedure added to ASC list in CY 2008 or later with MPFS nonfacility PE RVUs; payment based on MPFS nonfacility PE RVUs.
Type of Service (TOS) 2 - Surgery
Berenson-Eggers TOS (BETOS) P5A - Ambulatory procedures - skin
MUE 2
CCS Clinical Classification 170 - Excision of skin lesion
51 Multiple procedures: when multiple procedures, other than e/m services, physical medicine and rehabilitation services or provision of supplies (eg, vaccines), are performed at the same session by the same individual, the primary procedure or service may be reported as listed. the additional procedure(s) or service(s) may be identified by appending modifier 51 to the additional procedure or service code(s). note: this modifier should not be appended to designated "add-on" codes (see appendix d).
59 Distinct procedural service: under certain circumstances, it may be necessary to indicate that a procedure or service was distinct or independent from other non-e/m services performed on the same day. modifier 59 is used to identify procedures/services, other than e/m services, that are not normally reported together, but are appropriate under the circumstances. documentation must support a different session, different procedure or surgery, different site or organ system, separate incision/excision, separate lesion, or separate injury (or area of injury in extensive injuries) not ordinarily encountered or performed on the same day by the same individual. however, when another already established modifier is appropriate it should be used rather than modifier 59. only if no more descriptive modifier is available, and the use of modifier 59 best explains the circumstances, should modifier 59 be used. note: modifier 59 should not be appended to an e/m service. to report a separate and distinct e/m service with a non-e/m service performed on the same date, see modifier 25.
XS Separate structure, a service that is distinct because it was performed on a separate organ/structure
58 Staged or related procedure or service by the same physician or other qualified health care professional during the postoperative period: it may be necessary to indicate that the performance of a procedure or service during the postoperative period was: (a) planned or anticipated (staged); (b) more extensive than the original procedure; or (c) for therapy following a surgical procedure. this circumstance may be reported by adding modifier 58 to the staged or related procedure. note: for treatment of a problem that requires a return to the operating/procedure room (eg, unanticipated clinical condition), see modifier 78.
76 Repeat procedure or service by same physician or other qualified health care professional: it may be necessary to indicate that a procedure or service was repeated by the same physician or other qualified health care professional subsequent to the original procedure or service. this circumstance may be reported by adding modifier 76 to the repeated procedure or service. note: this modifier should not be appended to an e/m service.
78 Unplanned return to the operating/procedure room by the same physician or other qualified health care professional following initial procedure for a related procedure during the postoperative period: it may be necessary to indicate that another procedure was performed during the postoperative period of the initial procedure (unplanned procedure following initial procedure). when this procedure is related to the first, and requires the use of an operating/procedure room, it may be reported by adding modifier 78 to the related procedure. (for repeat procedures, see modifier 76.)
79 Unrelated procedure or service by the same physician or other qualified health care professional during the postoperative period: the individual may need to indicate that the performance of a procedure or service during the postoperative period was unrelated to the original procedure. this circumstance may be reported by using modifier 79. (for repeat procedures on the same day, see modifier 76.)
95 Synchronous telemedicine service rendered via a real-time interactive audio and video telecommunications system: synchronous telemedicine service is defined as a real-time interaction between a physician or other qualified health care professional and a patient who is located at a distant site from the physician or other qualified health care professional. the totality of the communication of information exchanged between the physician or other qualified health care professional and the patient during the course of the synchronous telemedicine service must be of an amount and nature that would be sufficient to meet the key components and/or requirements of the same service when rendered via a face-to-face interaction. modifier 95 may only be appended to the services listed in appendix p. appendix p is the list of cpt codes for services that are typically performed face-to-face, but may be rendered via a real-time (synchronous) interactive audio and video telecommunications system.
AQ Physician providing a service in an unlisted health professional shortage area (hpsa)
AS Physician assistant, nurse practitioner, or clinical nurse specialist services for assistant at surgery
CC Procedure code change (use 'cc' when the procedure code submitted was changed either for administrative reasons or because an incorrect code was filed)
E1 Upper left, eyelid
GA Waiver of liability statement issued as required by payer policy, individual case
GC This service has been performed in part by a resident under the direction of a teaching physician
GV Attending physician not employed or paid under arrangement by the patient's hospice provider
GW Service not related to the hospice patient's terminal condition
GZ Item or service expected to be denied as not reasonable and necessary
LT Left side (used to identify procedures performed on the left side of the body)
QX Crna service: with medical direction by a physician
RT Right side (used to identify procedures performed on the right side of the body)
SA Nurse practitioner rendering service in collaboration with a physician
SG Ambulatory surgical center (asc) facility service
T5 Right foot, great toe
X4 Episodic/focused services: for reporting services by clinicians who provide focused care on particular types of treatment limited to a defined period and circumstance; the patient has a problem, acute or chronic, that will be treated with surgery, radiation, or some other type of generally time-limited intervention; reporting clinician service examples include but are not limited to, the orthopedic surgeon performing a knee replacement and seeing the patient through the postoperative period
XE Separate encounter, a service that is distinct because it occurred during a separate encounter
XU Unusual non-overlapping service, the use of a service that is distinct because it does not overlap usual components of the main service
Date
Action
Notes
2013-01-01 Changed Short Descriptor changed.
2003-01-01 Changed Code description changed.
Pre-1990 Added Code added.
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