When assessing and treating patients with lower-extremity occlusive vascular lesions, health systems need to use the correct 2026 vascular territory codes. The 2026 update to the CPT code set includes significant changes to the vascular surgery section, and to be honest, this is one of the biggest structural overhauls coders have faced in years. Make sure your team is up to date with these changes to reduce denial risk and secure prompt payment. The codes changed. Your documentation and workflows need to change with them.
The CPT section codes for lower-extremity revascularization are broken down into different vascular territories (1). These territories cover the areas of the body (the lower extremities) that may require the endovascular intervention. Each territory has its own codes and coding guidelines.
Before 2026, there were three vascular territories: iliac, femoral and popliteal, and tibial and peroneal (1). The updated CPT section codes now include a new, fourth vascular territory: the inframalleolar (1).
Each vascular territory further breaks down into distinct vessels for coding purposes (1):
Note that in the femoral and popliteal territory, what was previously treated as a single vessel for code assignment is now divided into two distinct vessels (1). This distinction directly affects code selection.
The 2026 CPT code update introduced significant changes to lower-extremity revascularization. Codes 37220-37235 are now gone (2). In their place, there are 46 new codes (37254-37299) organized by vascular territory and treatment type (2).
Now, to accurately code procedures, health systems must precisely identify and record the arteries treated and the territories they occupy (3). Your physicians and cath lab staff will need to work closely together to ensure accurate recording of wire placement and treatment endpoints. Precision in the note is now precision in the code.
Codes will also reflect the intervention performed and the technique used (open or endovascular) (4).
Lesion complexity is another factor that determines which CPT code to use for lower extremity revascularization interventions (5). Straightforward interventions require a different code than complex interventions. The rule is simple: only use the complex codes when dealing with a 100% total occlusion. For anything less, use the appropriate straightforward lesion code (5).
Coders for lower extremity revascularization must also determine whether the imaging is bundled or separately reportable (4). Diagnostic angiography is still separately billable, for example, so long as one of four requirements is met and documented, and the decision to treat was based on the findings (6):
The base codes use a hierarchical reporting structure (5). Use the highest hierarchical code that applies (6). Both stent and atherectomy are higher in the hierarchy than balloon angioplasty, and a combined stent and atherectomy is the highest (5). Similarly, a complex lesion is higher than a straightforward lesion (5).
Keep in mind that the new codes 37254-37299 include all of the following services when performed in the treated vessels (5):
These services are not separately billable. However, you may report the extensive repair or replacement of an artery separately (5).
Any error in your coding could trigger a denial or delay in payment. Avoid these common vascular coding errors to ensure prompt payment:
Each one is avoidable with the right process.
Trying to keep track of and implement CPT changes every year can present huge challenges for health systems. Staff need more training, systems need updating, and things easily fall through the cracks, leading to substantial financial losses from coding errors. The denial triggers outlined above become far more likely in the months right after a major code set overhaul like this one.
So how do you keep up without another round of training sessions and system rework? Autonomous medical coding. While industry solutions often require lengthy retraining processes when coding guidelines are updated, Nym's rules-based Clinical Language Understanding (CLU) technology allows for rapid configuration changes. When the annual CPT and ICD-10 changes come out, the Nym team turns them into technical updates for the engine. After testing and previews, Nym's engine is ready to continue coding your patient encounters accurately and automatically. You stay compliant without the headaches and costly burden of manually adapting to the new codes.
Your coding team probably dreads update season. It doesn't have to be that way. Discover how Nym can simplify update season and transform your coding workflow.
Learn more about autonomous coding with Nym.
The new vascular territory added to CPT coding in 2026 is the inframalleolar (1). Now, there are four vascular territories: iliac, femoral and popliteal, tibial and peroneal, and inframalleolar (1).
As of 2026, CPT codes 37220-37235 are no longer used for lower-extremity revascularization (2). There are now 46 codes (37254-37299) for treating patients with peripheral arterial disease, based on the treated vessel within a vascular territory, the technology, and the lesion complexity (5).
Now that the CPT codes 37220-37235 for lower extremity revascularization are gone, medical coders must use codes 37254-37299 (2). CPT codes 37254–37262 are specific to vessels in the iliac vascular territory, 37263–37279 the femoral and popliteal vascular territory, 37280–37295 the tibial and peroneal vascular territory, and 37296–37299 the new inframalleolar vascular territory (2).
The new CPT codes distinguish between two levels of lesion complexity: straightforward and complex (5). Complete, 100% occlusions require the complex occlusion code, while anything less gets the straightforward code (5).
The bundled services in the new 2026 lower extremity revascularization codes include (5):
With Nym's autonomous medical coding engine, you don't have to worry about manually adapting to annual CPT coding updates like the 2026 vascular changes. The Nym team updates the engine to reflect the CPT code changes and simplify update season for health systems. With thorough testing and a preview option, health systems can count on Nym's engine for reliability, even amidst changes. Learn more about Nym's autonomous medical coding engine.