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Official Description

Colectomy, partial; with coloproctostomy (low pelvic anastomosis), with colostomy

© Copyright 2025 American Medical Association. All rights reserved.

Common Language Description

The CPT® Code 44146 refers to a surgical procedure known as a partial colectomy with coloproctostomy, which includes the creation of a colostomy. This procedure involves the surgical removal of a portion of the colon, followed by the construction of an anastomosis, which is the connection of the remaining segments of the colon. The term 'coloproctostomy' indicates that the anastomosis is made between the colon and the rectum, specifically in the low pelvic region. The procedure is typically performed through a midline incision in the abdomen, allowing the surgeon to access the abdominal cavity for inspection and intervention. During the operation, the superior rectal vessels are identified, dissected, ligated, and divided to facilitate the mobilization of the rectum and the affected segment of the colon. The diseased portion of the colon is then removed, and the remaining segments are sutured together to restore continuity of the gastrointestinal tract. Additionally, a diverting colostomy is created, which involves making an incision in the lower abdomen, usually on the right side, to bring a portion of the colon through the abdominal wall, forming a stoma. This stoma is then secured to the skin, and a colostomy appliance is applied to manage waste. The procedure is comprehensive, requiring careful attention to detail to ensure proper healing and function post-surgery.

© Copyright 2025 Coding Ahead. All rights reserved.

1. Indications

The procedure described by CPT® Code 44146 is indicated for various conditions affecting the colon and rectum. These may include:

  • Colon Cancer - The presence of malignant tumors in the colon that necessitate surgical removal.
  • Diverticulitis - Inflammation or infection of diverticula in the colon, which may require resection if severe.
  • Inflammatory Bowel Disease - Conditions such as Crohn's disease or ulcerative colitis that lead to significant damage or disease in the colon.
  • Colonic Obstruction - Blockages in the colon that prevent normal passage of stool, which may require surgical intervention.
  • Trauma - Injuries to the colon that necessitate surgical repair or resection.

2. Procedure

The procedure for CPT® Code 44146 involves several critical steps, which are detailed as follows:

  • Step 1: Incision and Inspection - A midline incision is made in the abdomen to allow access to the abdominal cavity. The surgeon inspects the area to assess the condition of the colon and rectum.
  • Step 2: Vascular Dissection - The superior rectal vessels are located and carefully dissected from the sacral promontory. These vessels are then ligated and divided to facilitate the mobilization of the rectum.
  • Step 3: Mobilization of the Rectum and Colon - The rectum is mobilized from its proximal aspect to the mid to distal aspect as necessary. Simultaneously, the segment of the colon that is to be resected is also mobilized to prepare for transection.
  • Step 4: Transection and Resection - The colon is clamped above and below the planned transection sites. The diseased segment of the colon is then transected and removed from the body.
  • Step 5: Anastomosis - The remaining distal and proximal segments of the colon are sutured together to create an anastomosis, restoring continuity of the gastrointestinal tract.
  • Step 6: Creation of Colostomy - A diverting colostomy is created by making an incision in the lower abdomen, typically on the right side. The colon is transected, and the distal segment is closed with sutures.
  • Step 7: Stoma Formation - The proximal segment of the colon is brought through the abdominal wall, everted, and sutured to the skin and subcutaneous tissue to form a stoma.
  • Step 8: Closure and Drain Placement - A colostomy appliance is placed at the stoma site, drains may be placed as necessary, and the abdominal incision is closed in layers to ensure proper healing.

3. Post-Procedure

After the completion of the procedure, patients typically require monitoring for any complications such as infection or bleeding. Post-operative care may include pain management, dietary modifications, and education on colostomy care. Patients are usually advised to follow up with their healthcare provider to assess recovery and the function of the anastomosis and colostomy. The expected recovery time can vary based on individual health factors and the extent of the surgery performed.

Short Descr PARTIAL REMOVAL OF COLON
Medium Descr COLECTOMY PRTL W/COLOPROCTOSTOMY & COLOSTOMY
Long Descr Colectomy, partial; with coloproctostomy (low pelvic anastomosis), with colostomy
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 Inpatient Procedures, not paid under OPPS
Type of Service (TOS) 2 - Surgery
Berenson-Eggers TOS (BETOS) P1B - Major procedure - colectomy
MUE 1
CCS Clinical Classification 78 - Colorectal resection

This is a primary code that can be used with these additional add-on codes.

44139 Addon Code MPFS Status: Active Code APC C CPT Assistant Article Illustration for Code Mobilization (take-down) of splenic flexure performed in conjunction with partial colectomy (List separately in addition to primary procedure)
96547 Add On Code MPFS Status: Active Code APC N Intraoperative hyperthermic intraperitoneal chemotherapy (HIPEC) procedure, including separate incision(s) and closure, when performed; first 60 minutes (List separately in addition to code for primary procedure)
96548 Add On Code MPFS Status: Active Code APC N Intraoperative hyperthermic intraperitoneal chemotherapy (HIPEC) procedure, including separate incision(s) and closure, when performed; each additional 30 minutes (List separately in addition to code for primary procedure)
GC This service has been performed in part by a resident under the direction of a teaching physician
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).
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
GW Service not related to the hospice patient's terminal condition
LT Left side (used to identify procedures performed on the left side of the body)
PD Diagnostic or related non diagnostic item or service provided in a wholly owned or operated entity to a patient who is admitted as an inpatient within 3 days
Q6 Service furnished under a fee-for-time compensation arrangement by a substitute physician or by a substitute physical therapist furnishing outpatient physical therapy services in a health professional shortage area, a medically underserved area, or a rural area
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
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
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