Coding Ahead
CasePilot
Medical Coding Assistant
Case2Code
Search and Code Lookup Tool
RedactPHI
HIPAA-Compliant PHI Redaction
DetectICD10CM
ICD-10-CM Code Detection
Log in Register free account
1 code page views remaining. Guest accounts are limited to 1 page view. Register free account to get 5 more views.
Log in Register free account

Official Description

Excision of rectal tumor, transanal approach; not including muscularis propria (ie, partial thickness)

© Copyright 2025 American Medical Association. All rights reserved.

Common Language Description

The CPT® Code 45171 refers to the excision of a rectal tumor using a transanal approach, specifically indicating that the procedure involves a partial thickness excision. This means that during the surgery, the excision does not extend into the muscularis propria, which is the thick muscle layer of the rectum responsible for its contraction. Instead, the excision may include the rectal mucosa, the muscularis mucosa, and the submucosa, which are the inner layers of the rectum. The transanal approach allows for direct access to the rectum through the anal canal, facilitating the removal of tumors located within this area. The procedure is typically performed with the assistance of an anoscope, a tubular instrument that helps visualize the rectal cavity and locate the tumor accurately. The excised tumor is sent for pathological evaluation to ensure that the margins are clear of cancerous cells, which is crucial for determining the success of the excision and planning any further treatment if necessary.

© Copyright 2025 Coding Ahead. All rights reserved.

1. Indications

The procedure described by CPT® Code 45171 is indicated for the excision of rectal tumors that are accessible via a transanal approach. This may include tumors that present with symptoms such as rectal bleeding, obstruction, or changes in bowel habits. The procedure is typically performed when a tumor is identified within the rectal wall that requires removal but does not necessitate a full thickness excision involving the muscularis propria.

  • Rectal Tumors Tumors located within the rectum that require excision.
  • Rectal Bleeding Symptoms such as rectal bleeding that may indicate the presence of a tumor.
  • Bowel Obstruction Conditions where a tumor may be causing obstruction in the rectal area.
  • Changes in Bowel Habits Alterations in bowel habits that may suggest underlying rectal pathology.

2. Procedure

The procedure begins with the patient positioned appropriately to allow access to the rectal area. An anoscope may be inserted to visualize the tumor clearly. Once the tumor is located, the rectal mucosa is incised to gain access to the deeper tissues. The incision is carefully extended through the layers of the rectal wall, ensuring that the tumor is excised along with a margin of healthy tissue to minimize the risk of residual disease. During the excision, frozen sections of the tissue may be obtained to confirm that the margins are clear of cancerous cells. This step is critical for ensuring that the tumor has been completely removed. After the tumor and surrounding tissue are excised, the incision in the rectum is closed using sutures to promote proper healing.

  • Step 1: Positioning The patient is positioned to allow optimal access to the rectal area for the procedure.
  • Step 2: Anoscope Insertion An anoscope is inserted to visualize the tumor within the rectum.
  • Step 3: Incision of Rectal Mucosa The rectal mucosa is incised to access the deeper layers of the rectal wall.
  • Step 4: Tumor Excision The tumor is excised along with a margin of healthy tissue, ensuring complete removal.
  • Step 5: Frozen Section Analysis Frozen sections are obtained to verify that the excised margins are clear of cancerous cells.
  • Step 6: Closure The incision in the rectum is closed with sutures to facilitate healing.

3. Post-Procedure

After the procedure, patients may be monitored for any immediate complications, such as bleeding or infection. Post-operative care typically includes pain management and instructions on bowel care to promote healing. Patients may be advised to follow a specific diet and to avoid straining during bowel movements. Follow-up appointments are essential to assess recovery and to review the results of the pathological evaluation of the excised tumor. Any further treatment or surveillance will be based on the findings from the pathology report.

Short Descr EXC RECT TUM TRANSANAL PART
Medium Descr EXC RCT TUM NOT INCL MUSCULARIS PROPRIA
Long Descr Excision of rectal tumor, transanal approach; not including muscularis propria (ie, partial thickness)
Status Code Active Code
Global Days 090 - Major Surgery
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) 2 - Payment restriction for assistants at surgery does not apply to this procedure...
Co-Surgeons (62) 1 - Co-surgeons could be paid, though supporting documentation is required...
Team Surgery (66) 0 - Team surgeons not permitted for this procedure.
Diagnostic Imaging Family 99 - Concept Does Not Apply
APC Status Indicator Hospital Part B services paid through a comprehensive APC
ASC Payment Indicator Non office-based surgical procedure added in CY 2008 or later; payment based on OPPS relative payment weight.
Type of Service (TOS) 2 - Surgery
Berenson-Eggers TOS (BETOS) P5E - Ambulatory procedures - other
MUE 2
CCS Clinical Classification 78 - Colorectal resection
22 Increased procedural services: when the work required to provide a service is substantially greater than typically required, it may be identified by adding modifier 22 to the usual procedure code. documentation must support the substantial additional work and the reason for the additional work (ie, increased intensity, time, technical difficulty of procedure, severity of patient's condition, physical and mental effort required). note: this modifier should not be appended to an e/m service.
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).
52 Reduced services: under certain circumstances a service or procedure is partially reduced or eliminated at the discretion of the physician or other qualified health care professional. under these circumstances the service provided can be identified by its usual procedure number and the addition of modifier 52, signifying that the service is reduced. this provides a means of reporting reduced services without disturbing the identification of the basic service. note: for hospital outpatient reporting of a previously scheduled procedure/service that is partially reduced or cancelled as a result of extenuating circumstances or those that threaten the well-being of the patient prior to or after administration of anesthesia, see modifiers 73 and 74 (see modifiers approved for asc hospital outpatient use).
53 Discontinued procedure: under certain circumstances, the physician or other qualified health care professional may elect to terminate a surgical or diagnostic procedure. due to extenuating circumstances or those that threaten the well being of the patient, it may be necessary to indicate that a surgical or diagnostic procedure was started but discontinued. this circumstance may be reported by adding modifier 53 to the code reported by the individual for the discontinued procedure. note: this modifier is not used to report the elective cancellation of a procedure prior to the patient's anesthesia induction and/or surgical preparation in the operating suite. for outpatient hospital/ambulatory surgery center (asc) reporting of a previously scheduled procedure/service that is partially reduced or cancelled as a result of extenuating circumstances or those that threaten the well being of the patient prior to or after administration of anesthesia, see modifiers 73 and 74 (see modifiers approved for asc hospital outpatient use).
54 Surgical care only: when 1 physician or other qualified health care professional performs a surgical procedure and another provides preoperative and/or postoperative management, surgical services may be identified by adding modifier 54 to the usual procedure number.
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.
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.
62 Two surgeons: when 2 surgeons work together as primary surgeons performing distinct part(s) of a procedure, each surgeon should report his/her distinct operative work by adding modifier 62 to the procedure code and any associated add-on code(s) for that procedure as long as both surgeons continue to work together as primary surgeons. each surgeon should report the co-surgery once using the same procedure code. if additional procedure(s) (including add-on procedure(s) are performed during the same surgical session, separate code(s) may also be reported with modifier 62 added. note: if a co-surgeon acts as an assistant in the performance of additional procedure(s), other than those reported with the modifier 62, during the same surgical session, those services may be reported using separate procedure code(s) with modifier 80 or modifier 82 added, as appropriate.
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.)
80 Assistant surgeon: surgical assistant services may be identified by adding modifier 80 to the usual procedure number(s).
82 Assistant surgeon (when qualified resident surgeon not available): the unavailability of a qualified resident surgeon is a prerequisite for use of modifier 82 appended to the usual procedure code number(s).
AG Primary physician
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)
CR Catastrophe/disaster related
GC This service has been performed in part by a resident under the direction of a teaching physician
GW Service not related to the hospice patient's terminal condition
SG Ambulatory surgical center (asc) facility service
XS Separate structure, a service that is distinct because it was performed on a separate organ/structure
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
2010-01-01 Added -
Code
Description
Code
Description
Code
Description
Code
Description
Code
Description
CasePilot

Get instant expert-level medical coding assistance.

Ask about:
CPT Codes Guidelines Modifiers Crosswalks NCCI Edits Compliance Medicare Coverage
Example: "What is CPT code 99213?" or "Guidelines for E/M services"