CPT code 61624 – Transcatheter CNS embolization

Key takeaways

CPT code 61624 covers percutaneous permanent occlusion or embolization of central nervous system vessels, meaning intracranial and spinal cord targets only.

Since CPT 2026, 61624 includes all radiological supervision and interpretation, so 75894 and 75898 are no longer reported with it.

Picking 61624 when the target sits outside the CNS is the top denial driver, since CPT 61626 covers non-CNS head and neck vessels.

Modifier -50 may apply to bilateral embolization, but payer rules differ, so confirm with your MAC before you submit.

Pabau’s claims management pre-fills the charge line from the record and validates required claim fields before submission.

CPT code 61624 covers permanent CNS embolization

CPT code 61624 covers transcatheter permanent occlusion or embolization of a central nervous system vessel, done percutaneously. Intracranial and spinal cord targets qualify. Head and neck vessels outside the CNS do not.

The American Medical Association’s CPT code set places the code in the Endovascular Therapy subsection of the nervous system surgery chapter. That placement matters, because the subsection’s 2026 revision changed what the code pays for. The official 2026 descriptor breaks into four parts.

• The act: transcatheter permanent occlusion or embolization
• The examples given: for tumor destruction, to achieve hemostasis, to occlude a vascular malformation
• New in 2026: all radiological supervision and interpretation, intraprocedural roadmapping, and imaging guidance necessary to complete the intervention
• Approach and site: percutaneous, any method; central nervous system (intracranial, spinal cord)

Three details in the operative report decide whether the code holds, and a fourth does not matter at all.

• Anatomic scope: intracranial vessels and spinal cord vessels only
• Approach: percutaneous, not open surgical
• Occlusion type: permanent, since temporary balloon occlusion codes elsewhere
• Method: any agent, so coils, liquid embolics and particles all report the same code

The procedures that map to 61624

Any percutaneous procedure that permanently occludes a CNS vessel maps to 61624, whatever the indication. Neurointerventional surgeons and interventional radiologists reach for it across six common scenarios.

• Cerebral AVM embolization: preoperative devascularization or definitive treatment of an intracranial arteriovenous malformation
• Intracranial aneurysm occlusion: parent vessel sacrifice or sac packing performed for permanent occlusion
• Tumor devascularization: preoperative embolization of a hypervascular intracranial or spinal tumor to cut blood loss in theater
• Hemostasis: occlusion of an identified feeding vessel to control CNS hemorrhage
• Spinal cord lesions: embolization of a spinal dural arteriovenous fistula or a spinal cord AVM
• Dural arteriovenous fistula: transarterial or transvenous embolization of an intracranial dural AVF

Location decides the code every time. If the embolized vessel feeds a CNS structure, 61624 applies. If the target is a head or neck vessel with no intracranial or spinal cord involvement, the case maps to 61626.

61624 vs 61626 turns on one vessel

61624 covers CNS embolization and 61626 covers non-CNS head and neck embolization. The technique is the same, and only the anatomy differs. Picking the wrong one drives more denials on these claims than any other error.

Name the vessel in the operative report and state its relationship to the CNS. A note describing embolization of an external carotid branch feeding a CNS tumor can support either code. Where the occlusion happened is what settles it.

How Medicare pays 61624 in 2026

Medicare pays 61624 from the CMS Physician Fee Schedule, multiplying the code’s relative value units by the annual conversion factor. CY2026 has two conversion factors rather than one. Qualifying APM participants are paid at $33.5675, and non-qualifying clinicians at $33.4009.

Geographic practice cost indices then adjust the payment by MAC jurisdiction, so the same case pays differently in Miami and in rural Iowa. Check your locality’s figures on the PFS lookup before you quote a number to anyone.

What goes into the RVU total

Four inputs decide the payment: work, practice expense, malpractice, and the conversion factor. Use the FastRVU 2026 lookup to confirm the current values for your locality before billing.

Place of service changes what you get paid

61624 is a facility procedure in practice, performed in a hospital interventional suite or an ASC. The facility rate applies when the place of service is 21, 22 or 24. Non-facility rates only fit a rare office-based interventional suite. Billing the wrong place of service creates an overpayment you will have to refund.

Which modifiers 61624 actually takes

61624 is a surgical code with no professional or technical split, so -26 and -TC do not apply to it. The modifiers that do matter cover laterality and unbundling.

Billing both sides in one session

Bilateral embolization is possible when vessels on either side of the CNS midline are occluded in the same session. Some MACs want one line with modifier -50. Others want two lines, one with -LT and one with -RT. Check the payer’s bilateral surgery policy before you submit.

• Check the MUE first: CMS sets a maximum number of units per day, and a bilateral claim has to stay inside it
• Medicare default: modifier -50 on one line at 150% of the unilateral rate, though some MACs want two lines at 100% each
• Commercial payers: rules vary widely, so get bilateral coverage confirmed in writing at prior authorization
• Documentation: name the left and right vessels treated and show that each occlusion was independently necessary

What you can still bill alongside 61624

CPT 2026 cut the list short. The revision folded all radiological supervision and interpretation into 61624, so 75894 and 75898 no longer go out with it. Catheterization access and a few other services still stand alone.

Check the current AAPC CPT code references and the NCCI edit table before you submit any combination.

The split between bundled and separately reportable is easier to see than to read.

NCCI edits decide what gets bundled

The National Correct Coding Initiative sets which codes fold into 61624 and which can go out beside it. CMS updates the tables quarterly, so a pairing that was billable in January may be bundled by April.

• Column 1 and Column 2 edits: some catheterization and imaging codes bundle into 61624 when they are components of the same service
• Modifier -59: reserve it for a service that is genuinely separate in site, session or indication. Using it to clear an edit is an audit trigger
• Mutually exclusive edits: confirm that a co-billed code is not listed as mutually exclusive with 61624
• Quarterly review: give one person on the billing team the CMS NCCI release notes each quarter

Pick the ICD-10 code that proves necessity

Every 61624 claim needs a linked ICD-10-CM code that establishes medical necessity, matched to the indication in the operative report. Specificity at the fifth and sixth character is what keeps the claim out of a truncation rejection.

Pull the subcode from the ICD-10-CM code set rather than from memory. The six codes below cover most 61624 indications.

Code to the highest level of specificity the note supports. For a ruptured aneurysm, the I60 subcode that names the vessel strengthens medical necessity and heads off a records request.

What the operative report has to say

MAC reviewers read the operative report before they pay a 61624 claim, and they read it for seven specific elements. Capture each one before the note is signed.

• Approach: write the word percutaneous, because open surgical embolization is not this code
• CNS location: name the vessel and confirm it is intracranial or spinal cord, since “head vessel” will not carry 61624 over 61626
• Occlusion type: confirm the occlusion is permanent, because temporary balloon occlusion codes elsewhere
• Embolic agent: record the agent used, whether coils, Onyx, Glubran or particles. It does not change the code, but it supports the necessity review
• Clinical indication: tie the procedure to the documented diagnosis in the same note
• Angiography findings: document the initial flow and the post-treatment result. Since CPT 2026 these are bundled into 61624 rather than separately billable
• Laterality: on a bilateral claim, name each side treated and justify each occlusion on its own

A structured note template built around those seven elements catches omissions before the note closes. Store each element as its own field and the check becomes mechanical.

Run this checklist before you submit 61624

The claim moves in a straight line, and it stalls at predictable points. The physician dictates, the coder abstracts the operative report, the charge posts, the clearinghouse checks required fields, and the payer adjudicates.

Each item below is a handoff where a 61624 claim usually goes wrong.

• Confirm the treated vessel is intracranial or spinal cord, quoting the vessel name from the note
• Confirm the note says percutaneous and permanent, in those words
• Drop 75894 and 75898 from the charge, since CPT 2026 bundled them
• Keep the access codes that still stand, such as 36224 or 36226
• Check the place of service against where the case was actually done
• Match the ICD-10-CM subcode to the indication in the operative report
• Verify the MUE and the payer’s bilateral policy before adding -50
• Attach the operative report on a high-value claim rather than waiting for the request

Run that list once and most 61624 denials never happen. Working the same list after a denial means an appeal instead of a payment.

Why 61624 claims get denied, and how to stop it

61624 denies more often than a routine procedure code, and the reasons repeat. Six patterns account for most of them, and each has a fix you can apply at submission. The same denial management strategies apply across the rest of your interventional claims.

• Wrong code (61624 vs 61626): confirm the treated vessel is intracranial or spinal cord before you pick. Ask the physician to clarify an ambiguous note before billing, not after the denial
• Thin medical necessity: a claim without an operative report naming the vessel, the indication and the approach goes straight to clinical review. Attach the report up front on high-value claims
• Bilateral errors: adding -50 without checking that the MAC accepts it, or without justifying each side, pays at the unilateral rate or denies outright
• Modifier -59 misuse: unbundling a service that belongs to the same procedure is an audit trigger, so reserve the modifier for genuinely separate work
• Stale imaging codes: submitting 75894 or 75898 alongside 61624 now triggers a bundling rejection under the CPT 2026 revision
• Vague diagnosis: an unspecified ICD-10-CM code on a complex intervention draws review, so use the most specific subcode the note supports

When a denial does land, appeal with the operative report, the applicable MAC coverage determination and a signed necessity statement from the physician. Most 61624 denials overturn at the first level when the documentation is complete.

How Pabau keeps 61624 charges accurate

Most 61624 errors start before the claim form, at charge entry, where a code gets keyed by hand from a note someone else wrote. Practice management software like Pabau takes a different route. Its accurate claims management pulls the code already attached to the service straight onto the charge line. Diagnosis slots are seeded from the patient’s recorded problem list.

The code libraries behind that are lookup and reference, holding more than 20,000 ICD-10-CM, CPT and HCPCS entries refreshed with each official release. A coder searching 61624 sees the stored descriptor rather than a half-remembered one. The software does not choose the code for you, and on a neurovascular case it should not.

Submission runs through Claim.MD on the US pipeline. Before the send button unlocks, Pabau checks that the claim’s required fields are filled, which is a completeness check rather than a coding opinion. Eligibility checks run live, remittances post back as ERAs, and claim status is tracked in the same place.

Keep 61624 charges accurate from the first claim

Pabau pulls the codes already on the encounter onto the claim line. Coders get a searchable CPT and ICD-10 library, and submission waits until the required fields are complete.

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Conclusion

The 2026 revision reshaped the 61624 claim more than any other change this year. Imaging supervision sits inside the code now, so the charge is simpler and the old 75894 habit is a rejection waiting to happen.

What has not changed is the vessel. One line in the operative report separates 61624 from 61626, and it decides whether the claim pays. Build that check into the note template and into charge entry, and the denial rate on these cases falls without extra work at appeal.

If charge entry is where your 61624 errors start, that is a workflow problem worth fixing. Book a demo to see how Pabau carries the encounter’s codes onto the claim and holds it until the required fields are complete.

Continue your research

Need to understand how claims move through a clearinghouse? Medical claims clearinghouse guide explains how electronic claim validation works before a claim reaches the payer.

Dealing with high denial volumes on complex procedure codes? Denial codes in medical billing covers the most common CARC reason codes and how to respond to each one.

Want the full revenue cycle context for interventional billing? What is revenue cycle management explains the end-to-end billing process from authorization through payment posting.

Looking up the descriptor for another procedure code? CPT code library collects the CPT billing guides on this site in one place.

Frequently asked questions