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Official Description

Sigmoidoscopy, flexible; with endoscopic ultrasound examination

© Copyright 2025 American Medical Association. All rights reserved.

Common Language Description

A flexible sigmoidoscopy is a diagnostic procedure that involves the use of a flexible tube equipped with a light and camera, known as a sigmoidoscope, to examine the lower part of the colon, specifically the sigmoid colon. This procedure is performed with the aid of an endoscopic ultrasound examination, which enhances the visualization of the intestinal wall and surrounding structures. During the procedure, the sigmoidoscope is carefully inserted into the anus and advanced through the rectum into the sigmoid colon. To facilitate this process, air is insufflated into the colon, which helps to separate the mucosal folds, allowing for a clearer view of the inner lining. Once the sigmoidoscope is in place, the physician withdraws it slowly while meticulously inspecting the mucosa for any abnormalities, such as polyps, tumors, or signs of inflammation. If any irregularities are detected, they are documented for further evaluation. Following the initial examination, an echoendoscope is introduced. This specialized instrument can be advanced further into the descending colon, providing a more comprehensive assessment. The echoendoscope is equipped with a transducer that is covered by a balloon filled with water, which aids in acoustic coupling for optimal ultrasound imaging. Continuous ultrasound imaging is conducted during this phase, allowing for the acquisition of detailed images that assist in evaluating any identified abnormalities. The primary purpose of echoendoscopy is to assess the depth of a tumor or lesion, determining whether it has penetrated beyond the mucosal layer into the submucosa or muscular wall of the colon, and to check for any involvement of adjacent organs or transmural spread. After a thorough evaluation of the tumor or lesion, the echoendoscope is carefully removed, concluding the procedure.

© Copyright 2025 Coding Ahead. All rights reserved.

1. Indications

The flexible sigmoidoscopy with endoscopic ultrasound examination is indicated for various clinical scenarios, particularly when there is a need to evaluate the lower gastrointestinal tract. The following conditions may warrant this procedure:

  • Evaluation of Abnormal Findings: This procedure is often performed to investigate abnormal findings from previous imaging studies or other diagnostic tests.
  • Assessment of Tumors: It is indicated for assessing the depth of penetration of tumors or lesions within the sigmoid colon and determining their potential spread to surrounding tissues.
  • Investigation of Symptoms: Patients presenting with symptoms such as rectal bleeding, unexplained abdominal pain, or changes in bowel habits may require this examination to identify underlying causes.
  • Surveillance of Known Conditions: It is also used for surveillance in patients with a history of colorectal cancer or polyps, allowing for monitoring of any changes over time.

2. Procedure

The procedure consists of several key steps that ensure a thorough examination of the sigmoid colon and surrounding structures:

  • Step 1: Preparation and Positioning The patient is positioned appropriately, typically lying on their left side, to facilitate access to the rectum and sigmoid colon. Adequate preparation may involve bowel cleansing to ensure clear visibility during the procedure.
  • Step 2: Insertion of the Sigmoidoscope A standard flexible sigmoidoscope is gently inserted into the anus and advanced through the rectum into the sigmoid colon. Air insufflation is utilized to expand the colon and separate the mucosal folds, enhancing visibility.
  • Step 3: Inspection of the Mucosa As the sigmoidoscope is withdrawn, the physician carefully inspects the mucosal lining for any abnormalities, such as polyps, lesions, or signs of inflammation. Any findings are documented for further analysis.
  • Step 4: Introduction of the Echoendoscope Following the initial examination, an echoendoscope is introduced. This specialized instrument is advanced as far as the descending colon, allowing for a more detailed evaluation of any identified abnormalities.
  • Step 5: Ultrasound Imaging The balloon covering the transducer housing of the echoendoscope is filled with water to facilitate acoustic coupling. Continuous ultrasound imaging is performed, capturing detailed images that assist in evaluating the depth of any tumors or lesions.
  • Step 6: Evaluation and Removal The physician assesses the ultrasound images to determine the extent of any lesions and their involvement with surrounding structures. Once the evaluation is complete, the echoendoscope is carefully removed from the patient.

3. Post-Procedure

After the procedure, patients may be monitored for a short period to ensure there are no immediate complications. It is common for patients to experience mild discomfort or cramping, which typically resolves quickly. Patients are advised to follow any specific post-procedure instructions provided by their healthcare provider, which may include dietary recommendations or activity restrictions. Follow-up appointments may be scheduled to discuss findings and any necessary further evaluations or treatments based on the results of the procedure.

Short Descr SIGMOIDOSCOPY W/ULTRASOUND
Medium Descr SIGMOIDOSCOPY FLX NDSC US XM
Long Descr Sigmoidoscopy, flexible; with endoscopic ultrasound examination
Status Code Active Code
Global Days 000 - Endoscopic or Minor Procedure
PC/TC Indicator (26, TC) 0 - Physician Service Code
Multiple Procedures (51) 3 - Special payment adjustment rules for multiple endoscopic 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.
Endoscopic Base Code 45330  Sigmoidoscopy, flexible; diagnostic, including collection of specimen(s) by brushing or washing, when performed (separate procedure)
Diagnostic Imaging Family 99 - Concept Does Not Apply
APC Status Indicator Procedure or Service, Multiple Reduction Applies
ASC Payment Indicator Surgical procedure on ASC list in CY 2007; payment based on OPPS relative payment weight.
Type of Service (TOS) 2 - Surgery
Berenson-Eggers TOS (BETOS) P8C - Endoscopy - sigmoidoscopy
MUE 1
CCS Clinical Classification 77 - Proctoscopy and anorectal biopsy
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).
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.
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).
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.
74 Discontinued out-patient hospital/ambulatory surgery center (asc) procedure after administration of anesthesia: due to extenuating circumstances or those that threaten the well being of the patient, the physician may terminate a surgical or diagnostic procedure after the administration of anesthesia (local, regional block(s), general) or after the procedure was started (incision made, intubation started, scope inserted, etc). under these circumstances, the procedure started but terminated can be reported by its usual procedure number and the addition of modifier 74. note: the elective cancellation of a service prior to the administration of anesthesia and/or surgical preparation of the patient should not be reported. for physician reporting of a discontinued procedure, see modifier 53.
AG Primary physician
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
GZ Item or service expected to be denied as not reasonable and necessary
PT Colorectal cancer screening test; converted to diagnostic test or other procedure
SG Ambulatory surgical center (asc) facility service
XE Separate encounter, a service that is distinct because it occurred during a separate encounter
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
2017-01-01 Changed Moderate (Conscious) Sedation flag removed. See new Moderate Sedation category.
2001-01-01 Added First appearance in code book in 2001.
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