Compression of vein

This code represents a condition where a vein is narrowed or flattened due to external pressure. This compression can impede normal blood flow, potentially leading to symptoms such as pain, swelling, or venous insufficiency in the affected area. It describes the physical impingement on a vein.

Apply this code when documentation explicitly states a vein is being compressed by an external structure, such as an anatomical anomaly, tumor, or scar tissue. This is appropriate for conditions like May-Thurner syndrome (iliac vein compression) or thoracic outlet syndrome when venous compression is specified. Supporting documentation should clearly identify the compressed vein and the nature of the compression.

• Do not use this code for intrinsic venous stenosis or thrombosis unless external compression is also documented as the cause.
• Always code the underlying cause of the compression (e.g., tumor, anatomical variant) first, if known and documented.
• Consider additional codes for any associated symptoms or complications, such as venous insufficiency (459.81) or edema (782.3).