2026 ICD-10-CM Diagnosis Code S36.13XAInjury of bile duct, initial encounter
S36.13XA is a billable ICD-10-CM diagnosis code for injury of bile duct, initial encounter. The 7th character A marks it as an initial encounter code, used while the patient is receiving active treatment. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026) and groups to MS-DRG 444 through 446, 963 through 965. Coders also document this condition as bile duct injury with open wound into cavity. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Internal organ injury, initial encounter.
Code Identity
Code Classification
Approximate SynonymsGuidance
Alternate terms and clinical phrases that map to this code.
- Bile duct injury with open wound into cavity
- Bile duct tear
- Contusion of bile duct
- Hemorrhage of bile duct
- Injury of bile duct
- Injury of bile duct without open wound into abdominal cavity
- Injury of biliary tree
- Peri-bile duct hematoma
- Transection of bile duct
Coding GuidelinesGuidance
The appropriate 7th character is to be added to each code from block Injury of intra-abdominal organs (S36). Use the following options for the applicable episode of care:
- A - initial encounter
- D - subsequent encounter
- S - sequela
Source: ICD-10-CM Official Guidelines for Coding and Reporting, FY 2026, published by CMS and the National Center for Health Statistics.
Clinical ClassificationClinical
AHRQ’s CCSR groups this code into broader clinical categories.
Patient EducationClinical
Bile Duct Diseases
Your liver makes a digestive juice called bile. Your gallbladder stores it between meals. When you eat, your gallbladder pushes the bile into tubes called bile ducts. They carry the bile to your small intestine. The bile helps break down fat. It also helps the liver get rid of toxins and wastes.
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Convert S36.13XA to ICD-9-CMHistory
The closest ICD-9-CM equivalents under the General Equivalence Mappings.
Code HistoryHistory
Questions About S36.13XAOverview
Is S36.13XA (Injury of bile duct) a billable code?
Yes. This is a billable ICD-10-CM code, specific enough to report injury of bile duct, initial encounter on HIPAA-covered claims from October 1, 2025 through September 30, 2026.
What does the 7th character A in S36.13XA mean?
The final character A marks the initial encounter: use it while the patient is receiving active treatment for injury of bile duct, such as an emergency visit or first evaluation.
What MS-DRG does S36.13XA group to?
When injury of bile duct, initial encounter is the principal diagnosis on an inpatient stay, it groups to MS-DRG 444, 445, 446, 963, 964, 965, with relative weights from 0.8273 to 2.7338 depending on complications. Higher weights mean higher Medicare reimbursement.
What is the ICD-9 equivalent of S36.13XA?
Under the General Equivalence Mappings, injury of bile duct, initial encounter converts to ICD-9-CM 868.02 (biliary tract injury-cl). The mapping is approximate, so confirm the match fits the documentation.
Footnotes
[1] Not chronic - A diagnosis code that does not fit the criteria for chronic condition (duration, ongoing medical treatment, and limitations) is considered not chronic. Some codes designated as not chronic are acute conditions. Other diagnosis codes that indicate a possible chronic condition, but for which the duration of the illness is not specified in the code description (i.e., we do not know the condition has lasted 12 months or longer) also are considered not chronic.
