CPT code 61510 – Craniotomy for brain tumor resection

Key takeaways

CPT Code 61510 covers craniectomy or craniotomy to excise a supratentorial brain tumor, except meningioma, which bills as 61512.

The code carries a 90-day global surgical period, so routine post-op visits in that window are bundled into the surgical payment.

Malignant C71 codes for supratentorial sites, D33.0 (benign) and D43.0 (uncertain behavior) are the main diagnosis pairings.

In 2026, 61510 carries 64.71 total RVUs, or roughly $2,161 at the national Medicare rate before geographic adjustment.

Pabau, the practice management platform we build, tracks prior-auth status and checks code combinations before a neurosurgery claim goes out.

CPT Code 61510: Official description and procedure overview

CPT Code 61510 is defined by the American Medical Association as: Craniectomy, trephination, bone flap craniotomy; for excision of brain tumor, supratentorial, except meningioma.

In plain terms, it is the code for opening the skull to remove a tumor above the tentorium that is not a meningioma. Three words in that descriptor carry the most coding weight: “supratentorial,” “excision,” and “except meningioma.”

“Supratentorial” means the tumor sits above the tentorium cerebelli, within the cerebral hemispheres. Tumors below the tentorium (cerebellum, brainstem) route to 61518 through 61521 instead. “Excision” means the surgeon removes the tumor mass, not just biopsies it. And “except meningioma” is a hard exclusion: meningioma resection has its own code, 61512, even when the approach is otherwise identical.

What the operative procedure involves

Knowing the surgical sequence helps coders spot a missing detail in the operative note before the claim goes out. A typical 61510 case follows this operative path:

1. Patient positioning and scalp incision. The surgeon positions the patient to expose the tumor’s anatomical region and creates a scalp incision, usually curvilinear, to access the skull.
2. Bone flap creation (craniotomy). Burr holes are drilled and connected with a craniotome to lift a bone flap. The operative note must document the location and size of the flap to confirm the supratentorial approach.
3. Dural opening. The surgeon opens the dura mater to expose the cortical surface. Intradural neuronavigation (add-on CPT 61781) may be used from this point. If it is billed separately, the operative note must confirm its use.
4. Tumor resection. The neurosurgeon identifies and excises the tumor, often using an operating microscope (CPT 69990). The operative note should describe the resection margins and any cortical mapping if functional mapping was performed.
5. Specimen handling. The excised tumor is sent to pathology. CPT 61510 itself does not mandate a pathology report. Many payers still require one to confirm the diagnosis code and the nature of the lesion.
6. Closure. The dura is closed, the bone flap is replaced and secured, and the scalp is closed in layers.

Documentation requirements for CPT Code 61510

The operative note carries most of the weight on a 61510 claim. Submitting a clean claim for this code requires the note to address each of the following:

• Confirmed supratentorial approach. The note must explicitly state the tumor’s location above the tentorium cerebelli. “Supratentorial” should appear verbatim, not just implied by anatomical landmarks.
• Bone flap details. Location, dimensions, and method of creation. Reviewers use it to confirm an open craniectomy or bone flap craniotomy, rather than a burr hole biopsy, which bills under a different code.
• Tumor description and excision confirmation. The note must document that the tumor was excised, not merely biopsied. If only partial resection or debulking was performed, document the clinical reason.
• Pathology specimen notation. State that the specimen was sent to pathology. Even when your payer does not require the report itself, noting the send creates an audit trail.
• Neuronavigation use, if applicable. If billing 61781, the note must confirm the navigation system was used and that it guided the intradural resection.
• Operating microscope use, if applicable. If billing CPT 69990, the operative note must document that the microscope was deployed and was integral to the procedure.
• Co-surgeon roles, if applicable. When modifier -62 applies, both surgeons must document their distinct intraoperative contributions in separate operative notes.

Use a superbill for neurosurgery services that prompts for each of these elements at point of care. Retrofitting documentation after denial is time-consuming and not always successful.

CPT 61510 vs. related craniotomy codes

The 615xx neurosurgery family is tightly clustered by tumor type and anatomical region. Selecting the wrong code is one of the most common billing errors for this procedure family.

The most error-prone pairing is 61510 versus 61512. Meningiomas are the most common primary intracranial tumor and are often supratentorial, so coders sometimes default to 61510. The AMA descriptor’s “except meningioma” language is unambiguous. If the pathology report confirms meningioma, use 61512.

For the four main tumor codes, two questions settle the choice: where the tumor sits, and what pathology confirms.

Allowable add-on codes with CPT 61510

Several add-on codes may be billed alongside 61510 when the services are documented and meet payer criteria. Confirm NCCI edit compatibility for the current quarter before billing any of them.

Billing 61781 without explicit operative documentation of navigation use is a denial trigger. Tumor excision under 61510 is intradural, so the extradural code 61782 rarely fits, and the two are never reported together. Payer acceptance of navigation add-ons varies, so confirm current policy before billing. CPT 69990 is generally well-accepted by Medicare and most commercial payers when the operative note documents microscope use.

Applicable modifiers for CPT Code 61510

Modifier selection for 61510 depends on the surgical team configuration and any billing complexity. These are the modifiers most relevant to neurosurgery craniotomy cases:

• -62 (Co-surgeons). When two neurosurgeons each perform a distinct, documented portion of the craniotomy, both may bill 61510-62. Each surgeon must document their specific intraoperative role. Payers reduce payment to approximately 62.5% of the fee schedule amount per surgeon.
• -80 (Assistant surgeon). A physician who assists the primary surgeon bills 61510-80. Medicare typically pays 16% of the primary surgeon’s allowable.
• -AS (Non-physician assistant at surgery). This applies when a physician assistant, nurse practitioner, or clinical nurse specialist assists. Some payers require -AS rather than -80 for these practitioners.
• -22 (Increased procedural complexity). Reserved for cases significantly more complex than typical. It requires a written justification attached to the claim, and overuse invites audit.
• -51 (Multiple procedures). Applied to lower-valued procedures when multiple codes are billed on the same day. The highest-valued code is billed without -51; additional codes receive it. Confirm NCCI edit status before applying.
• -LT / -RT (Laterality). Indicate left or right hemisphere when payer policy or claim format requires it. They are not universally required, but they reduce ambiguity on repeat craniotomy cases.

ICD-10 diagnosis codes paired with CPT 61510

The correct ICD-10 pairing depends on the tumor’s histology and confirmed anatomical sub-site. Use the most specific code available after pathology confirmation.

Do not use C71.9 (unspecified) when the operative report and imaging confirm a specific lobe. Payers look hard at unspecified codes on high-cost procedures. The CDC/NCHS ICD-10-CM web tool allows free lookups to confirm the most specific available code for each case.

Medicare reimbursement rate and work RVUs for CPT Code 61510

CPT 61510 carries 30.06 work RVUs in 2026, reflecting the complexity and duration of supratentorial tumor resection. The figures below are from the CMS Medicare Physician Fee Schedule. Rates are updated annually and adjusted by geographic practice cost index (GPCI). Always confirm current-year values before submitting claims.

Because 61510 is performed almost exclusively in a hospital operating room, the facility rate applies in virtually all cases. At the 2026 CMS national conversion factor of $33.4009, a facility claim generates roughly $2,161 before geographic adjustment.

Qualifying APM participants (QPs) use a slightly higher factor of $33.5675. Use the FastRVU lookup tool to calculate locality-adjusted figures. Note that co-surgeon billing (-62) reduces each surgeon’s allowed amount to approximately 62.5% of the facility total.

Global surgical period for CPT 61510

CPT 61510 carries a 90-day global surgical period, as confirmed by the CMS Medicare Physician Fee Schedule global days indicator. This means the following services are bundled into the primary surgical payment:

• Pre-operative visits the day before and the day of surgery
• Intraoperative services included in the surgical package
• Routine post-operative visits within 90 days of the surgery date

Four modifiers allow separate billing within the global window when the clinical situation warrants it:

• -24: Unrelated E&M visit during the global period (e.g., the patient presents with a new condition unrelated to the craniotomy)
• -57: Decision for surgery, for the E&M visit the day before or the day of the craniotomy where the decision to operate was made
• -25: Significant, separately identifiable E&M on the same day, for a problem beyond the decision for surgery and the routine pre-op work
• -79: Unrelated procedure during the global period (e.g., a second surgery for a separate diagnosis within the 90-day window)

A return to the operating room for a complication of the original craniotomy is billed with modifier -78. Medicare pays only the intraoperative portion, and no new global period starts. Complications managed outside the operating room stay bundled, so document the clinical distinction carefully.

Prior authorization and payer-specific requirements

Medicare does not currently require prior authorization for CPT 61510 in most jurisdictions, but commercial payers apply a range of preauthorization policies. Thorough insurance eligibility verification before scheduling is non-negotiable for a procedure at this cost level.

When commercial payers require authorization, they typically ask for:

• Current MRI or CT imaging confirming tumor location, size, and supratentorial position
• Oncology or neuro-oncology consult note recommending surgical intervention
• Neurosurgery attestation documenting the surgical plan and clinical necessity
• ICD-10 diagnosis code tied to the specific tumor histology (confirmed or suspected)

Urgent or emergent craniotomies may bypass standard authorization workflows. The practice still needs retrospective authorization within the payer’s timeframe, often 24–72 hours after the procedure. On elective cases, an authorization that expires before the surgery date can sink the whole claim, so track each one against the scheduled date.

Common denial reasons for CPT 61510 and how to avoid them

High-dollar neurosurgery claims attract close scrutiny. Understanding structured denial management workflows for 61510 starts with knowing the five most common triggers:

• Wrong anatomical region. This means billing 61510 for an infratentorial (posterior fossa) tumor. The operative note and imaging must confirm supratentorial position. If the surgeon operates across the tentorium, document the primary site.
• Missing pathology notation. Many payers cross-reference the ICD-10 code against pathology results. If the diagnosis code indicates malignancy but no pathology report accompanies the claim, denial is likely. Send the report or reference the specimen number in the claim narrative.
• NCCI edit violations. These come from billing add-on codes (61781, 69990) without confirming current NCCI edit status. The National Correct Coding Initiative updates quarterly, so check before each claim cycle.
• Incomplete -62 documentation. Both co-surgeons submit claims, but only one operative note exists. Payers reviewing -62 claims require distinct documentation from each surgeon. A shared note with a single signature fails this requirement.
• Facility vs. professional claim mismatch. This happens when the professional claim uses non-facility RVUs for a procedure performed in a hospital OR. The place-of-service code on the claim must match the setting.

Sorting your denial codes by reason is the fastest way to see which of these patterns drives your 61510 denials.

Streamlining neurosurgery billing workflows with Pabau

High-complexity codes like 61510 only pay when the billing workflow keeps pace with surgical volume. A practice billing several craniotomies a week is tracking prior authorizations, add-on codes, co-surgeon notes, and 90-day global windows at once.

Pabau supports faster, cleaner claims management by checking code combinations and tracking prior-auth status against each case. For electronic submission, Pabau connects to Claim.MD, a clearinghouse that runs eligibility checks and routes 837P claims to thousands of US payers.

The result is less time chasing authorizations and resubmitting rejected claims. Mapping the wider medical billing workflows behind complex procedures also helps you design intake and documentation that stop denials before they happen.

Reduce 61510 claim denials with Pabau

Pabau’s billing tools help neurosurgery practices track prior-auth status, validate code combinations, and submit cleaner claims across complex high-value procedures. See how it works for your practice.

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Conclusion

If you bill CPT Code 61510, put the effort into the operative note before the claim goes out, not into the appeal after it. Three details carry the most weight on review: the word “supratentorial,” the pathology result, and proof of every add-on you bill.

That costs a few extra minutes of documentation per case. Against a national Medicare payment of roughly $2,161, the time pays for itself the first time it prevents a denial.

Book a demo to see how Pabau keeps prior authorizations, code checks, and craniotomy claims in one billing workflow.

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