CPT code 21047: Excision of benign tumor or cyst of mandible

Key takeaways

CPT code 21047 covers excision of a benign mandibular tumor or cyst requiring extra-oral osteotomy and partial mandibulectomy.

The code carries roughly 19.57 work RVUs and 32.23 total RVUs, which pays about $1,076 nationally before geographic adjustment.

Medicare lists the same 2026 national amount for the facility and non-facility settings, and the code carries a 90-day global period.

Choosing between 21040, 21046, and 21047 turns on the surgical approach and whether a partial mandibulectomy was performed.

Practice management software like Pabau keeps the operative note, modifier use, and claim status on one record, so denials get caught early.

CPT code 21047 covers excision of a benign tumor or cyst of the mandible. It applies when the surgeon works through an extra-oral approach, performs an osteotomy, and removes part of the jaw.

Reach for it when a locally aggressive lesion has remodeled bone past the point where curettage or an intraoral excision will do. Ameloblastoma and an expanded odontogenic keratocyst are the usual examples. Simpler lesions belong in 21040 or 21046.

This guide covers the AMA descriptor, the codes on either side of it, the ICD-10-CM crosswalk, applicable modifiers, RVU components, and Medicare rates.

It then covers documentation and prior authorization, which is where most of the payment on this code is won or lost. All fee figures are subject to geographic adjustment, so check them against the current CMS Physician Fee Schedule lookup.

What CPT code 21047 covers

The code is maintained by the American Medical Association (AMA) within the Excision Procedures on the Head section of the CPT code set. Its full descriptor reads:

Excision, benign tumor or cyst, mandible; requiring extra-oral osteotomy and partial mandibulectomy (e.g., locally aggressive or destructive lesion)

Three elements must all be present. First, the pathology must be benign. Second, the approach must be extra-oral, meaning the surgeon enters through the skin or submandibular tissue rather than transorally. Third, the surgeon must perform both an osteotomy and a partial mandibulectomy.

A transoral excision without osteotomy and partial mandibulectomy belongs in a different code, however large the lesion. The parenthetical phrase about locally aggressive or destructive lesions is instructive rather than limiting.

It signals the clinical picture that usually drives this approach, which is a lesion that has expanded, remodeled, or invaded cortical bone. The lesion needs no specific diagnosis, but the operative note has to make the rationale clear.

Lesions that justify an extra-oral resection

A handful of pathology types account for most of these cases. Each is benign by classification while behaving aggressively in bone, which is what makes a conservative intraoral approach inadequate.

• Ameloblastoma: The most frequently cited indication. This odontogenic epithelial tumor recurs often after simple enucleation, so it usually needs a marginal or segmental mandibulectomy to reach adequate margins.
• Odontogenic keratocyst: Also called a keratocystic odontogenic tumor. It is known for aggressive bone expansion and a high recurrence rate, and larger or recurrent lesions often need resection rather than enucleation.
• Central giant cell lesion: Larger, locally destructive giant cell granulomas may need surgical resection once they have expanded beyond what conservative management can control.
• Desmoplastic fibroma: Rare, but locally aggressive enough that resection is generally required for adequate control.
• Calcifying epithelial odontogenic tumor: The Pindborg tumor is less common, and advanced cases can be destructive enough to require a partial mandibulectomy.

Pathology confirmation is required. The operative note should reference the working diagnosis at the time of surgery. Keep the final pathology report in the clinical record so medical necessity is easy to evidence if the claim is reviewed.

21047 vs the other mandible excision codes

The 21040 to 21049 range covers benign lesion excision in the mandible and the maxilla. Three variables separate the codes: whether the approach is intraoral or extra-oral, whether an osteotomy and partial resection are performed, and which bone is involved.

Medicare Administrative Contractor (MAC) auditors look for one upcoding pattern in particular. It is 21047 billed for a procedure that included neither an extra-oral osteotomy nor a partial mandibulectomy.

The distinction between 21046 and 21047 is the approach. 21046 covers an intraoral osteotomy. 21047 requires an external incision plus a partial mandibulectomy.

When the operative report names a submandibular incision and a segmental mandibulectomy, 21047 is the right selection. When the surgeon never leaves the mouth, it is not, whatever the lesion measures.

Two neighboring code families cause most of the remaining confusion. An osteotomy performed to move the jaw rather than remove a lesion belongs to the orthognathic codes, such as 21199.

Soft tissue lesion excision follows a different logic again, since dermatology practices pick their excision codes by lesion size and margin rather than by approach.

ICD-10-CM diagnosis codes that support the claim

Every claim needs a paired ICD-10-CM diagnosis code that supports medical necessity. The codes below are the ones most often matched to mandibular lesion resections. Verify the current crosswalk pairings and confirm MAC coverage policy in a tool such as CrossCoder before you submit.

D16.5 is the broadest fit whenever the pathology report confirms a benign mandibular neoplasm. Specificity improves claim acceptance, so name the lesion wherever the report names it.

If the pathology says ameloblastoma, use D16.5 rather than a general cyst code, since the ICD-10-CM index maps ameloblastoma of the mandible there.

Modifiers that apply

This is a surgical code, so modifier rules follow standard CMS and National Correct Coding Initiative (NCCI) guidance. The table below covers the modifiers that come up most often on mandibular excision claims.

Modifier 22 deserves particular attention. MACs scrutinize these claims because they trigger a manual review for additional payment. The note has to describe concrete factors, such as extensive cortical bone involvement, prior radiation to the field, or simultaneous reconstruction.

Practices that build those prompts into their operative note templates catch the missing language before the claim goes out.

RVU values and the 2026 conversion factor

Relative Value Units (RVUs) drive Medicare payment through the Resource-Based Relative Value Scale. This code carries three RVU components, and their sum is multiplied by the annual conversion factor to produce the national unadjusted rate.

The figures below are the published 2026 values, and you can confirm them in the FastRVU lookup tool or the CMS data file.

For 2026, CMS set two conversion factors rather than one. Qualifying alternative payment model participants are paid at $33.5675, and everyone else at $33.4009. At the lower figure, 32.23 total RVUs work out at roughly $1,076 before any local adjustment.

The difference between the two factors is worth about $5 on a single 21047 claim, which adds up across a surgical list.

Geographic Practice Cost Indices then adjust each component by locality, so the same operation pays differently in Manhattan and in rural Mississippi. Groups operating across several sites need reporting that tracks those adjustments by location, or the variance never surfaces.

The code also carries a 90-day global period, which means routine post-operative visits inside that window are not separately billable.

Medicare reimbursement and fee schedule

Medicare usually pays two different amounts for a procedure depending on where it happens. The facility rate is lower, because the hospital or ambulatory surgery center bills separately for the overhead. The non-facility rate is higher, because the practice carries that cost itself.

This code is an exception. CMS lists the same national amount for both settings in 2026, so the site of service does not change what the surgeon is paid. In practice the claim almost always goes out with a facility place of service, since the resection needs an operating room and general anesthesia.

Facility vs non-facility reimbursement rates

These are national averages before adjustment. Actual payment moves with locality, the conversion factor that applies to you, and any modifiers on the claim.

Verify current rates through the CMS fee schedule lookup or your MAC’s published schedule. Commercial payers usually reimburse at a percentage of the Medicare schedule, though contracted rates vary a lot by plan.

Practices juggling Medicare, Medicaid, and commercial contracts need to track fee schedule variation by payer and procedure. Practice management workflows that link procedure codes to payer contracts can flag an underpayment when it happens, rather than during a reconciliation months later.

Documentation requirements for the operative note

Surgical claims live or die on the operative report. An incomplete report is the most common reason high-value codes like this one get denied or downcoded on audit. The note has to capture all three code-defining elements: the extra-oral approach, the osteotomy, and the extent of the mandibulectomy.

• Approach: Name the extra-oral incision, for example submandibular or retromandibular. A note that says only “mandibular excision performed” is not enough.
• Osteotomy: Describe the cuts, including where they sit relative to the lesion margins and which landmarks were used. State that the osteotomy was performed rather than implying it.
• Extent of resection: Specify marginal mandibulectomy, where the inferior cortex is preserved, or segmental mandibulectomy, which is full thickness. Both support 21047 when the approach and osteotomy criteria are met.
• Lesion characterization: Document the pre-operative imaging findings, the intraoperative appearance, and the working diagnosis. Reference the pre-operative biopsy where one exists.
• Medical necessity: Add a sentence explaining why an extra-oral approach was required instead of an intraoral one. This is the element most often missing from audited records.

Reconstruction is coded separately, and it needs its own documentation. A bone graft to the mandible is reported with 21215, while a free fibula transfer is reported with 20955. Both require the donor site to be named, and the free flap also requires the microvascular anastomosis to be described.

Where a plastic surgery team handles that reconstruction, their note and the resection note have to agree on how much bone came out. Two operative reports that describe the same jaw differently give a reviewer an easy reason to deny both claims.

A structured note is worth more than the claim it supports. Templates that prompt the surgeon for each required element before dictation cut the number of addenda written later. Practices that keep audit-ready records see faster claim processing and fewer post-payment reviews. File the pathology report alongside the operative note, because MACs request both together.

Prior authorization and payer considerations

Prior authorization rules for this code vary by payer and plan, but the patterns are predictable enough to plan around. Getting the package right the first time is what protects the payment.

Medicare: Traditional Medicare does not require prior authorization for this code in most MAC jurisdictions. Medicare Advantage plans generally do, and their coverage policies vary widely even inside the same carrier family. Verify the requirement with the specific plan before you schedule surgery.

Commercial payers: Most require prior authorization for mandibular resection. Submit the request with pre-operative imaging showing cortical expansion or bone destruction, the biopsy result confirming benign pathology, and a clinical summary. Payers will often approve a simpler code and refuse the upgrade later, so the documentation has to support the extra-oral approach from the start.

Common denial reasons on these claims:

• The operative report does not document an extra-oral approach, so the claim is downcoded to 21046
• Modifier 22 appended without specific complexity documentation
• The ICD-10-CM code does not match the clinical indication, such as a malignant code on a benign lesion
• Missing pre-authorization on a commercial payer claim
• The wrong place of service code, creating a facility versus non-facility mismatch

A denial tracking system that records the reason code for every rejection pays for itself here. Without one, the same missing sentence repeats across a dozen claims before anyone spots the pattern. A HIPAA-compliant system that links scheduling, operative documentation, and claim submission builds the trail payers ask for.

How Pabau keeps high-value surgical claims clean

Most oral and maxillofacial surgery practices run this workflow across three systems. The operative note sits in the clinical record, the claim goes out through a separate billing tool, and denials land in someone’s inbox. Nobody sees the whole picture until the month-end report, by which point the same documentation error has shipped on ten more claims.

Practice management software like Pabau keeps those three things on one patient record. Claims management sits next to the clinical note, so a coder can read the operative report while building the claim instead of requesting it.

Note templates prompt the surgeon for the approach, the osteotomy, and the extent of resection before the note is signed off.

Denials come back into the same record with their reason codes attached. That means a pattern shows up after two claims rather than twenty. You can also see whether the problem is one surgeon’s dictation or one payer’s policy. So your team spends its time fixing the cause instead of rekeying the same appeal.

Manage oral surgery billing without the manual work

Pabau brings scheduling, clinical notes, and claims management onto one patient record. Oral and maxillofacial surgery practices use it to track modifier use, spot denial patterns early, and keep documentation audit-ready.

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Conclusion

What this code pays is decided in the operating room, not in the billing office. A report that names the incision, the osteotomy, and the extent of bone removed gets paid at the full rate. One that says “mandibular excision performed” gets downcoded to 21046, and winning the difference back on appeal takes weeks.

So the fix sits upstream of the claim. Give the surgeon a template that asks the three questions before the note is signed, and check the note against it before submission. That one habit removes the most common denial on this code, and it costs nothing to put in place.

Book a demo to see how Pabau keeps operative notes, modifier use, and claim status on one record for oral and maxillofacial surgery practices.

Continue your research

Coding a tumor resection outside the jaw? CPT code 21936 walks through radical resection of a soft tissue tumor and the documentation it needs.

Billing facial reconstruction alongside a resection? CPT code 21255 covers zygomatic arch and glenoid fossa reconstruction, including its RVUs and modifiers.

Handling orbital cases in the same practice? CPT code 21184 sets out the billing rules for orbital wall reconstruction.

No code fits the procedure you performed? CPT code 20999 explains how to submit an unlisted musculoskeletal procedure without losing the payment.

Want a reference your whole team can share? Our medical coding cheat sheet collects the CPT, ICD-10, HCPCS, and E/M codes practices reach for most.

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