0F7C4ZZ
Dilation Ampulla of Vater to No Qualifier with No Device, Percutaneous Endoscopic Approach
Procedural Specifications
| Clinical Axis | Detail Definition |
|---|---|
| Section | 0 Medical and Surgical |
| Body System | F Hepatobiliary System and Pancreas |
| Operation | 7 Dilation |
| Body Part | C Ampulla of Vater |
| Approach | 4 Percutaneous Endoscopic |
| Device | Z No Device |
| Qualifier | Z No Qualifier |
Operation Definition
Expanding an orifice or the lumen of a tubular body part
Procedure Overview
Dilation procedures widen a narrowed segment of the biliary or pancreatic duct system, most often to relieve a stricture that is blocking the flow of bile or pancreatic enzymes. Strictures can develop from scarring after gallbladder surgery, chronic pancreatitis, or a tumor compressing the duct, and if left untreated they cause bile or digestive fluid to back up, leading to jaundice, infection, or pain.
The procedure typically involves passing a balloon catheter into the narrowed duct, often guided by endoscopy or fluoroscopy, and inflating it to stretch the tissue open; a stent may be left behind afterward to help keep the duct open, though the stent placement itself is coded separately as an Insertion.
Anatomy & Axis Detail
Ampulla of Vater
The ampulla of Vater is the shared outlet where the common bile duct and main pancreatic duct empty into the duodenum through the sphincter of Oddi, and narrowing here can obstruct both biliary and pancreatic drainage simultaneously. Dilation of the ampulla is performed endoscopically, using balloon catheters to widen a papillary stricture or a stenotic sphincter, often as an alternative or adjunct to sphincterotomy when stones need to be extracted or drainage restored. Because the ampulla's small size and dual-duct anatomy make it sensitive to manipulation, balloon dilation here carries a recognized risk of post-procedure pancreatitis, so the size and duration of dilation are chosen carefully. Documentation should clarify that the papilla itself, rather than the distal bile duct proper, was the structure widened.
Approach: Percutaneous Endoscopic
Percutaneous Endoscopic combines a puncture through skin or mucous membrane with insertion of an endoscope to visualize the procedure internally, as in laparoscopic cholecystectomy. It is distinguished from plain Percutaneous by the presence of scope-guided visualization, and from Via Natural or Artificial Opening Endoscopic by its route being a new puncture rather than an existing orifice or stoma.
Coding & Documentation
The operative note needs to clearly document that a narrowed lumen was expanded, and coders should look for the specific duct treated - common bile duct, hepatic duct, or pancreatic duct - since the fourth character body part varies accordingly. Device documentation matters: if a stent is left in place after dilation, that's an additional Insertion code, while a temporary balloon used only to stretch the duct carries no device value. A frequent mistake is coding the balloon dilation and the subsequent stent placement as a single procedure, when ICD-10-PCS requires them as separate codes. Coders should also distinguish endoscopic retrograde approaches (via ERCP) from percutaneous transhepatic approaches, since the approach character differs based on how the scope or catheter reached the duct.