021W4ABBypass Thoracic Aorta, Descending to Subclavian with Autologous Arterial Tissue, Percutaneous Endoscopic Approach
- Billable / Specific Code
021W4AB is a billable ICD-10-PCS procedure code for Bypass Thoracic Aorta, Descending to Subclavian with Autologous Arterial Tissue, Percutaneous Endoscopic Approach. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026) and groups to 12 MS-DRGs. The root operation Bypass involves altering the route of passage of the contents of a tubular body part.
Code Identity
PCS Table Breakdown
Each ICD-10-PCS code is built from seven characters, each an axis of the procedure. Hover or tap the icons for the official CMS definitions.
| Position | Designation | Value | Meaning |
|---|---|---|---|
| 1 | Section | 0 | Medical and Surgical |
| 2 | Body System | 2 | Heart and Great Vessels |
| 3 | Operation | 1 | Bypass |
| 4 | BodyPart | W | Thoracic Aorta, Descending |
| 5 | Approach | 4 | Percutaneous Endoscopic |
| 6 | Device | A | Autologous Arterial Tissue |
| 7 | Qualifier | B | Subclavian |
Convert to ICD-9-PCS
Closest ICD-9-PCS equivalents for 021W4AB under the General Equivalence Mappings.
Code History
Similar Procedure Codes
Questions About 021W4AB
Is 021W4AB a billable code?
Yes. 021W4AB is a complete seven-character ICD-10-PCS code, specific enough to report Bypass Thoracic Aorta, Descending to Subclavian with Autologous Arterial Tissue, Percutaneous Endoscopic Approach on inpatient claims from October 1, 2025 through September 30, 2026.
What do the characters in 021W4AB mean?
021W4AB breaks down character by character: the 1st character 0 is the Section (Medical and Surgical); the 2nd character 2 is the Body System (Heart and Great Vessels); the 3rd character 1 is the Operation (Bypass); the 4th character W is the BodyPart (Thoracic Aorta, Descending); the 5th character 4 is the Approach (Percutaneous Endoscopic); the 6th character A is the Device (Autologous Arterial Tissue); the 7th character B is the Qualifier (Subclavian).
What MS-DRG does 021W4AB group to?
On an inpatient stay, Bypass Thoracic Aorta, Descending to Subclavian with Autologous Arterial Tissue, Percutaneous Endoscopic Approach maps to MS-DRGs 037, 038, 039, 270, 271, 272, 907, 908, 909, 957, 958, 959, with relative weights from 1.1755 to 7.6199. The MS-DRG sets the fixed Medicare payment for the stay.
What is the ICD-9-PCS equivalent of 021W4AB?
Under the General Equivalence Mappings, Bypass Thoracic Aorta, Descending to Subclavian with Autologous Arterial Tissue, Percutaneous Endoscopic Approach crosswalks to ICD-9-PCS 39.22. The mapping is approximate, so confirm it fits the documentation.
