Glossary · Clinical
Radiofrequency ablation (RFA)
Radiofrequency ablation (RFA) is a minimally invasive procedure that uses thermal energy in the radiofrequency range to destroy pain-transmitting nerve tissue, interrupting nociceptive signals from structures such as facet joints, the sacroiliac joint, or the genicular nerves of the knee. It is also applied percutaneously to ablate metastatic or primary bone tumors.
Verified May 8, 2026 · 9 sources ↓
Definition
Source · Editorial summary grounded in 9 cited references ↓
RFA works by passing a high-frequency alternating current through a needle electrode placed adjacent to a target nerve or lesion. The resulting resistive heating—typically 80–85 °C for conventional (non-pulsed) RFA—causes coagulative necrosis of the nerve, blocking pain transmission without removing tissue. In spine care, the most common targets are the medial branch nerves of the dorsal rami that innervate the facet joints; in the knee, the genicular nerve branches are targeted; and in the sacroiliac joint region, the nerves innervating the posterior capsule are ablated. Image guidance (fluoroscopy or CT) is integral to accurate needle placement and is bundled into the procedure codes for most orthopedic RFA applications—it cannot be billed separately.
In musculoskeletal oncology, RFA is used to destroy one or more metastatic bone tumors and adjacent involved soft tissue percutaneously. This application uses a distinct CPT code family (20982 for bone tumor ablation) that is independent of the nerve-destruction codes used in pain management. Imaging guidance for tumor ablation follows different bundling rules and should be verified against current NCCI edits before billing separately.
From a coverage standpoint, Medicare Local Coverage Determination L38803 governs facet joint RFA and requires documented diagnostic medial branch blocks as a prerequisite. Procedural documentation must specify which nerves were ablated and which joints were treated at each level—reporting is per joint, not per nerve. Societies including ASIPP, AANS/CNS, and NICE support appropriate use of RFA, though the evidence base for long-term spinal efficacy continues to evolve.
Why it matters
Improper code selection or documentation gaps directly cause claim denials and post-payment audits. Bundling errors—such as separately billing fluoroscopy guidance (77002, 77003) that is already included in codes like 64624 or 64625—trigger NCCI edit denials. Bilateral procedures must be reported with modifier -50 on a single line (1 unit) rather than as two separate line items, or the second side will be denied under Medically Unlikely Edit limits. At the facility level, the difference between an office-based RFA payment (~$411 physician Medicare fee for 64624 office) and an ASC setting (~$949 Medicare national average) can be substantial, making correct site-of-service reporting critical to both revenue integrity and compliance.
Common mistakes
Where people most often go wrong with this concept.
Source · Editorial brief grounded in cited references ↓
- Billing fluoroscopy or CT guidance codes (77002, 77003, 77012) separately when they are already bundled into 64624, 64625, 64633, and 64635 per NCCI policy.
- Submitting bilateral RFA as two separate line items instead of one line with modifier -50 and 1 unit, which violates the MUE of 1 for codes 64624 and 64625.
- Reporting codes per nerve treated rather than per joint treated for facet and sacroiliac RFA—CPT requires one unit of 64635 for the primary joint and add-on code 64636 for each additional joint at the same level.
- Using nerve-destruction codes (64633–64636, 64624, 64625) for bone tumor RFA instead of the correct musculoskeletal code 20982.
- Failing to document the specific nerve(s) ablated and the joint level(s) treated in the operative note, which is required by CPT Assistant guidance and is a frequent audit trigger under LCD L38803.
- Skipping or inadequately documenting the prerequisite diagnostic medial branch blocks before facet RFA, resulting in medical necessity denials under CMS LCD L38803.
- Applying facet joint RFA codes (64633/64635) to genicular nerve ablation instead of the correct code 64624.
Related codes
Codes commonly involved when this concept appears in practice.
Frequently asked questions
Source · Generated from the editorial pipeline, verified against 9 cited references ↓
01What is the difference between RFA and radiofrequency neurotomy?
02Can I bill fluoroscopy guidance separately when performing genicular nerve RFA with CPT 64624?
03How do I report bilateral genicular or SI joint RFA performed in the same session?
04How many CPT units does a two-level lumbar facet RFA (e.g., L3-4 and L4-5) generate?
05What Medicare coverage criteria apply to spinal facet RFA?
06Which CPT code covers RFA of a metastatic bone lesion?
07Does the site of service affect how much Medicare pays for an RFA procedure?
Sources & references
Editorial content was developed using the following public sources. Last verified May 8, 2026.
- 01CMS LCD L38803 — Facet Joint Interventions for Pain Management: https://www.cms.gov/medicare-coverage-database/view/lcd.aspx?LCDId=38803
- 02Medtronic RFA for Nerve Tissue 2026 Coding and Payment Guide: https://www.medtronic.com/content/dam/medtronic-wide/public/united-states/products/neurological/radiofrequency-ablation-nerve-tissue-reimbursement-guide.pdf
- 03Boston Scientific Radio Frequency Ablation 2026 Reimbursement Guide: https://www.bostonscientific.com/content/dam/bostonscientific/Reimbursement/pain-management/thumbnails/RF-Reimbursement-Guide.pdf
- 04Boston Scientific Radiofrequency Ablation 2025 Coding & Reimbursement Guide: https://www.bostonscientific.com/content/dam/bostonscientific/Reimbursement/peripheral-intervention/pdf/RF_ablation_coding_and_reimbursement_guide.pdf
- 05CPT Assistant, May 2020 — Documentation guidance for RFA nerve codes 64635/64636 (via GoHealthcare Practice Solutions): https://www.gohealthcarellc.com/blog/radiofrequency-ablation-rfa-of-nerves
- 06AAPC Codify — CPT 20982 description and forum guidance: https://www.aapc.com/codes/cpt-codes/20982
- 07AAOS Coding Resources: https://www.aaos.org/education/about-aaos-products/coding-resources/
- 08CMS NCCI Policy Manual, Chapter I, V.3.a.ii — bilateral procedure reporting rules
- 09CMS Transmittal 1421, CR 8853 — bilateral modifier guidance: http://www.cms.gov/Regulations-and-Guidance/Guidance/Transmittals/Downloads/R1421OTN.pdf
Mira AI Scribe
When Mira detects an RFA procedure note, it applies the following logic before suggesting codes: 1. TARGET STRUCTURE — Distinguish nerve-destruction RFA (facet, genicular, or SI joint) from bone-tumor RFA. Nerve RFA maps to the 646xx family; bone tumor RFA maps to 20982. 2. ANATOMIC LEVEL — For facet RFA, identify whether the level is cervical/thoracic (64633 primary + 64634 add-on) or lumbar/sacral (64635 primary + 64636 add-on). Flag if the note lists only 'lumbar RFA' without specifying the number of joints—documentation must state each joint treated. 3. LATERALITY — If both sides are treated in the same session, apply modifier -50 to the primary code with 1 unit. Do not generate two separate line items. 4. IMAGING GUIDANCE BUNDLING — Suppress separate imaging guidance codes (77002, 77003, 77012) for 64624, 64625, 64633, and 64635; these are already included. Flag any separately listed imaging codes for coder review. 5. PREREQUISITE DOCUMENTATION — For facet RFA (64633–64636), verify the note references a prior diagnostic medial branch block response. If absent, generate a documentation gap alert referencing LCD L38803. 6. NERVE SPECIFICITY — Confirm the operative report names the specific nerve(s) ablated and the joint level(s) per CPT Assistant (May 2020) guidance. If only generic language ('facet denervation performed') is present, flag for surgeon addendum before submission. 7. SITE OF SERVICE — Capture whether the procedure was performed in the office, ASC, or hospital outpatient setting, as this materially affects the allowable (e.g., ~$411 vs. ~$949 Medicare national average for 64624).
See Mira's approachRelated terms
A facet joint injection delivers a diagnostic or therapeutic agent—typically corticosteroid with or without local anesthetic—directly into a paravertebral (zygapophysial) joint or onto the medial branch nerves that supply it, under fluoroscopic or CT guidance, to identify or treat axial spine pain.
A Local Coverage Determination (LCD) is a regional Medicare policy issued by a Medicare Administrative Contractor (MAC) that defines when a specific service, procedure, or supply is considered reasonable and medically necessary within that contractor's jurisdiction.