Irreversible Electroporation (IRE): Guidelines, Documentation Tips, and 2026 CPT Updates
Irreversible electroporation (IRE) is a minimally invasive, non-thermal ablation technique. It uses short, high-voltage electrical pulses to create permanent pores in cell membranes. As a result, it destroys the targeted tissue while better preserving nearby structures such as vessels and ducts.
In interventional radiology and oncology, providers increasingly use IRE for liver and prostate tumors. In particular, they choose it when thermal ablation (radiofrequency, microwave, or cryoablation) is too risky near critical structures. From a coding perspective, IRE is an image-guided ablation procedure, often performed in the interventional radiology suite or a hybrid OR. Beginning in 2026, new CPT codes and revised guidance make accurate documentation and code selection even more important.
Clinical Overview: Where Is IRE Used?
You will most commonly see IRE for liver lesions. For example, providers use it for primary liver tumors such as hepatocellular carcinoma, and for metastatic lesions near vessels or bile ducts. Providers also use IRE for prostate lesions, especially for focal therapy of localized prostate cancer when nerve sparing and function are major goals. Other uses, such as the pancreas or kidney, appear mainly in research or limited practice.
Key 2026 CPT Updates Affecting Irreversible Electroporation (IRE)
New Category I Codes for IRE of the Liver and Prostate
New codes specifically describe IRE of the liver and IRE of the prostate. Therefore, coders no longer need unlisted or generic ablation codes for these services. Beginning January 1, 2026, stop using any prior unlisted or temporary codes for IRE, and map these services to the new Category I codes.
Related Imaging and Endovascular Updates
The 2026 code set also adds new Category I codes for head and neck CTA and CT perfusion (CTP), replacing older Category III codes. In addition, it introduces structured reporting for thoracic branch endograft procedures. It also revises the prostate biopsy codes to match modern imaging-guided techniques, such as MRI and ultrasound fusion, and updates the sacroiliac joint arthrodesis codes. Patients who undergo advanced therapies like IRE often have related imaging, biopsies, or interventions, so coders need to know all of these changes.
Revised Embolization and Endovascular Guidelines
CPT also revises the vascular embolization and occlusion guidelines and the endovascular therapy guidelines. Specifically, they clarify when imaging guidance is included, when you may report separate imaging codes, and how to handle multiple territories and approaches.
Imaging Guidance and Bundling
IRE almost always involves imaging guidance, and this is where many denials occur. Expect expanded bundling of fluoroscopy, CT, and ultrasound guidance into the new IRE and endovascular codes. Also, stand-alone guidance codes, especially neurointerventional codes such as 61624 and 61626, will have clearer rules about when you can report them separately.
Do not unbundle imaging that the code descriptor explicitly includes. Instead, report separate imaging codes only when they are truly independent diagnostic studies that meet medical necessity and documentation standards. Medical Coding Bundling and Upcoding
Coding tip: Always verify which imaging modality the provider used. Then, read the full code descriptors and parenthetical notes in the 2026 CPT manual to see whether the guidance is included.
Documentation Requirements for IRE in 2026
To assign the correct IRE code and any related imaging or embolization codes, the documentation should clearly capture the following details.
Target Organ and Lesions
The record should state the organ, the number and location of the lesions treated, and their size when documented.
Approach and Access
Next, it should note whether the approach was percutaneous, open, or laparoscopic. It should also list the access sites and any vascular access for combined endovascular therapy.
Technique
The note must confirm that the modality was irreversible electroporation. In addition, it should record the number of electrode or probe placements and whether the provider treated multiple lesions in one encounter.
Imaging Guidance
The note should identify the modality and whether the imaging was diagnostic, guidance, or both. If you bill a diagnostic study separately, the documentation must show a new or changing condition and clinical decisions based on the findings.
Concurrent Procedures and Devices
Finally, the record should describe any embolization, endovascular therapy, or thoracic branch endograft work in the same session. It should also name the IRE system, the electrodes or probes, and any endografts or embolic materials.
Coding Workflow Tips for IRE Encounters
First, confirm the procedure type. In other words, verify that the technique was IRE, not RFA, microwave, or cryoablation, and identify the target organ. Second, assign the 2026 organ-specific IRE code, and check for add-on codes when the provider treated multiple lesions. Third, if embolization or endovascular therapy occurred in the same session, apply the updated codes and guidelines, paying close attention to the vascular territory and bundling rules. Next, check for related services, such as a prostate biopsy using the revised biopsy codes. Finally, apply modifiers such as 26, TC, 59, or the X modifiers only when the documentation and payer allow them.
Common Pitfalls in IRE Coding
Avoid using retired Category III codes after 2025, because they will lead to denials. Also, avoid unbundling imaging guidance that the new codes include. In addition, review the revised embolization and endovascular guidelines to prevent incorrect code combinations. Finally, make sure the documentation ties the imaging findings to the decision to perform IRE, especially when you bill diagnostic imaging separately.
Best Practices for Coders and Practices
Train coding and clinical teams together on the new IRE, imaging, embolization, and endovascular codes. For example, walk through sample operative notes and map them to the 2026 codes. Also, work with providers to update templates so they capture organ and lesion details, approach, imaging modality, device type, and vascular territory. Finally, refresh your cheat sheets and charge masters with the 2026 code set.
The Bottom Line
IRE has matured enough to justify new, organ-specific Category I CPT codes for the liver and prostate starting January 1, 2026. For medical coders, success depends on clear documentation, careful reading of the imaging bundling rules, and updated systems. With the right preparation, you can code IRE procedures confidently and help ensure clean claims.
Related Resources
Coding Clarified Blog
Billing and Coding: Irreversible Electroporation for Cancer