44160

Colectomy, partial, with removal of terminal ileum with ileocolostomy

The procedure represented by CPT code 44160 is an open partial colectomy that includes the resection of the terminal ileum with the subsequent creation of an ileocolostomy. This surgical intervention is widely referred to as a right hemicolectomy or an ileocecectomy. The procedure is typically performed to treat a variety of pathological conditions affecting the right side of the colon, the cecum, and the terminal portion of the small intestine. Common indications include malignant neoplasms such as colon cancer or carcinoid tumors, severe inflammatory bowel disease like Crohn's disease, complex polyps that cannot be managed endoscopically, ischemic bowel disease, or complicated appendicitis with extensive cecal involvement. During the procedure, the surgeon makes a midline abdominal incision to access the peritoneal cavity. The right colon, including the cecum, ascending colon, and sometimes a portion of the transverse colon, is mobilized along with the terminal ileum. Critical attention is paid to the vascular supply, necessitating the careful dissection, ligation, and division of the ileocolic, right colic, and occasionally the right branch of the middle colic vessels, along with their accompanying lymph nodes for adequate oncological clearance if malignancy is suspected. Following vascular isolation, the terminal ileum and the selected portion of the colon are transected, and the diseased bowel segment is removed en bloc. To restore gastrointestinal continuity, the surgeon performs an ileocolostomy, which is an anastomosis joining the healthy end of the ileum to the remaining colon. This anastomosis can be constructed using either hand-sewn sutures or surgical stapling devices, and may be configured in an end-to-end, end-to-side, or side-to-side fashion depending on the clinical scenario and the surgeon's preference. Finally, the mesenteric defect is closed to prevent internal herniation, hemostasis is meticulously verified, and the abdominal incision is closed in layers. Furthermore, the postoperative care involves close monitoring of the patient for potential complications such as anastomotic leak, surgical site infection, bleeding, or postoperative ileus. The choice between an open approach (44160) and a laparoscopic approach (44205) is dictated by the patient's surgical history, the presence of extensive adhesions, the size of the tumor, and the overall clinical stability of the patient. Proper coding requires careful review of the operative report to confirm that the terminal ileum was indeed resected and that the approach was open, not laparoscopic.

Clinical Indications

  • Malignant neoplasm of the cecum, ascending colon, or hepatic flexure
  • Carcinoid tumors of the appendix or terminal ileum
  • Crohn's disease affecting the terminal ileum and right colon
  • Large, complex, or unretrievable benign polyps in the right colon
  • Complicated appendicitis involving the cecal wall (e.g., severe phlegmon or perforation)
  • Intestinal ischemia or infarction affecting the ileocecal region
  • Severe radiation enteritis or colitis in the right lower quadrant
  • Volvulus of the cecum

Procedure Steps

  1. The patient is placed under general anesthesia and positioned supine on the operating table.
  2. A standard midline laparotomy incision is made to expose the abdominal cavity.
  3. Thorough exploration of the abdomen is performed to assess the extent of the disease and check for metastases if applicable.
  4. The terminal ileum, cecum, and right colon are mobilized by incising the white line of Toldt along the right paracolic gutter.
  5. The mesentery supplying the right colon and terminal ileum is identified, and the ileocolic, right colic, and branches of the middle colic arteries are isolated, ligated, and divided.
  6. The bowel is clamped and transected at the predetermined proximal margin (terminal ileum) and distal margin (ascending or transverse colon).
  7. The resected specimen (terminal ileum, cecum, right colon, and regional lymph nodes) is removed en bloc.
  8. Gastrointestinal continuity is restored by creating an ileocolostomy (anastomosis between the ileum and the remaining colon) using staplers or hand-sewn sutures.
  9. The mesenteric defect is approximated and closed to prevent internal hernias.
  10. The abdomen is irrigated, hemostasis is confirmed, and the fascial and skin layers of the abdominal wall are meticulously closed.

Coding Guidelines

  • Do not report CPT 44160 in conjunction with CPT 44205 (Laparoscopic partial colectomy with removal of terminal ileum) for the same session. If a laparoscopic procedure converts to an open procedure, code only the open procedure (44160).
  • Incidental appendectomy is bundled into this procedure and should not be reported separately (e.g., CPT 44950).
  • If an extensive unlisted additional procedure is performed, modifier 22 may be appended if accompanied by substantial documentation of increased procedural complexity or time.
  • Do not report 44160 with other partial colectomy codes (e.g., 44140) if performed on the same contiguous segment of the colon.
  • Confirm the operative report explicitly documents the removal of the terminal ileum; if the terminal ileum is not removed, use CPT 44140.

Associated ICD-10 Codes