CPT® Code 46742

1. Indications

The procedure described by CPT® Code 46742 is indicated for patients presenting with a high imperforate anus accompanied by a rectourethral or rectovaginal fistula. This condition is typically diagnosed in neonates and may lead to significant complications if not addressed promptly. The indications for this surgical intervention include:

• High Imperforate Anus A congenital anomaly where the anal opening is absent or improperly formed, necessitating surgical correction.
• Rectourethral Fistula An abnormal connection between the rectum and urethra, which can cause complications such as urinary and fecal incontinence.
• Rectovaginal Fistula An abnormal connection between the rectum and vagina, leading to similar complications and requiring surgical intervention for repair.

2. Procedure

The surgical procedure for CPT® Code 46742 involves several critical steps to ensure the successful repair of the high imperforate anus with associated fistulas. The steps are as follows:

• Step 1: Incision An incision is made posterior to the anorectal muscles in the perineum to access the rectal pouch. This initial incision is crucial for the subsequent dissection and mobilization of the rectum.
• Step 2: Dissection The dissection is carried up to the presacral space, continuing until the rectal pouch is identified. Care is taken to avoid damaging surrounding structures during this process.
• Step 3: Mobilization The rectal pouch is mobilized, ensuring complete separation from all attachments to the genitourinary tract. This step is vital for the successful repair of the fistulous tract.
• Step 4: Abdominal Incision An incision is made in the abdomen to inspect the abdominal cavity. This allows for the proximal aspect of the rectum to be exposed, and the superior rectal vessels to be located and protected during the procedure.
• Step 5: Entry into Presacral Space The peritoneum is incised, allowing entry into the presacral space. Dissection continues through both the abdominal and perineal incisions until the rectum is fully mobilized.
• Step 6: Fistula Identification and Excision The fistulous tract is identified, the opening is severed, and the tract is excised. This step is critical to eliminate the abnormal connection and prepare for reconstruction.
• Step 7: Wound Closure The wound is closed following the excision of the fistulous tract, and the abdominal incision is also closed to complete the procedure.
• Step 8: Anoplasty The anoplasty is completed by suturing the rectal mucosa circumferentially to the skin to create a new anal opening, restoring normal anatomy and function.

3. Post-Procedure

Post-procedure care following the surgical repair of a high imperforate anus with rectourethral or rectovaginal fistula is essential for optimal recovery. Patients are typically monitored for any signs of complications, such as infection or bleeding. Pain management is provided as needed, and patients may require a temporary colostomy depending on the extent of the surgery and the individual case. Follow-up appointments are crucial to assess healing, ensure proper function of the newly created anal opening, and address any concerns that may arise during the recovery process. Additionally, education on bowel management and potential long-term outcomes is provided to the patient and caregivers to facilitate a smooth transition post-surgery.