61500

🧠 CPT 61500 — Craniectomy; With Excision Of Tumor Or Other Bone Lesion Of Skull

Quick Reference

wRVU: 18.70 | Global Period: 090 | Assistant Payable: Yes (per-carrier documentation may be required) | Bilateral Indicator: 0
Rule: CPT 61500 is a 090-day major surgery code with a work RVU nearly double that of most burr-hole and exploratory craniectomy codes, reflecting the added work of bone resection for pathology rather than simple access. It carries no NCD and is not restricted by a Noridian LCD, so coverage hinges on documented medical necessity.¹ᐟ²

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📋 Clinical Description

CPT 61500 describes an open craniectomy performed specifically to excise a tumor, metastatic deposit, or other destructive bone lesion arising from the calvarium itself, distinguishing it from codes describing craniectomy performed purely to access intracranial pathology. The surgeon incises scalp and pericranium, uses a craniotome or burr to remove the affected segment of skull en bloc or piecemeal, and excises the lesion along with a margin of grossly normal bone when oncologically appropriate. Unlike 61458, which is performed for cranial nerve exploration or decompression at the suboccipital region, 61500 targets the bone itself as the pathologic structure rather than using the craniectomy as a corridor to neural structures. It also differs from 61510, which describes craniectomy performed to reach and excise an intra-axial supratentorial brain tumor — in that code the bone is removed and typically replaced as a flap, whereas 61500 contemplates the bone as the diseased tissue being resected.

Documentation should clearly establish that the lesion originates in or has eroded into the calvarial bone (primary bone tumor, metastasis, fibrous dysplasia, or similar), since coding a case as 61500 when the pathology is purely intradural or intra-axial will misrepresent the procedure performed. The descriptor does not include mention of cranioplasty or bone graft reconstruction, so if the surgeon reconstructs the resulting calvarial defect with a graft or synthetic implant in the same session, that reconstruction is separately reportable.³

This procedure may be performed in the following clinical contexts:

• Primary calvarial neoplasm — Excision of an osteoma, osteosarcoma, chondrosarcoma, or other primary bone tumor arising from the skull, often confirmed on preoperative CT or MRI showing cortical destruction.
• Metastatic skull deposit — Resection of a solitary symptomatic skull metastasis (breast, prostate, renal, or lung primary being common sources) causing pain, cosmetic deformity, or local mass effect.
• Fibrous dysplasia or other benign fibro-osseous lesion — Contouring or excision of a benign but progressively enlarging lesion causing cosmetic deformity or, less commonly, cranial nerve compression at a foramen.
• Diagnostic excisional biopsy — Removal of an indeterminate calvarial lesion when imaging cannot distinguish benign from malignant etiology and tissue diagnosis is required to guide oncologic management.

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🔬 Anatomical & Procedural Considerations

Variant	Mechanism	Key Notes
En bloc excision	The surgeon plans a margin around the lesion on imaging, then uses a craniotome to remove the involved bone as a single specimen, preserving orientation for pathology and allowing assessment of margin adequacy.	Preferred for suspected or confirmed malignancy where margin status affects staging and recurrence risk; often paired with intraoperative frozen section.
Piecemeal removal	The lesion and surrounding reactive or thinned bone are removed in fragments, typically with rongeurs or a high-speed drill, when the bone is too fragile or the lesion too diffuse for a single specimen.	More common with benign fibro-osseous disease or when the dura is densely adherent and staged separation reduces the risk of a dural tear.
Combined dural repair	When the lesion has eroded through the inner table and involves the dura, the surgeon resects the involved dura along with the bone and repairs the defect with a graft or dural substitute.	This dural work is not bundled into 61500 and should be evaluated for separate reporting per the operative note; watch for NCCI edits before unbundling.

Clinical Pearl

The single most common coding error with 61500 is applying it to a craniectomy performed to access an intracranial tumor rather than to remove a tumor of the bone itself. Read the operative note for whether the pathology specimen sent was calvarial bone versus dura or brain parenchyma — that distinction, not the fact that a craniectomy occurred, is what drives code selection between 61500 and the excision-of-brain-tumor code families (61510–61521).

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✅ Procedure Includes

• Scalp incision, soft tissue dissection, and elevation of the pericranial flap to expose the affected skull.
• Craniotome or burr-hole based osteotomy to outline and free the involved segment of calvarial bone.
• Excision of the tumor or bone lesion, including a margin of adjacent bone as clinically indicated.
• Hemostasis of the diploic space and adjacent dura, including bone wax or bipolar cauterization as needed.
• Routine exploration of the immediately accessible field once the bone is removed.
• Closure of soft tissue layers, with or without a drain, at the conclusion of the case.

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❌ Excludes / Do Not Report Together

Code	Description	Relationship
61501	Craniectomy; for osteomyelitis	Reports the same anatomic approach but for infectious rather than neoplastic bone disease; code selection depends entirely on the operative indication documented, and the two are mutually exclusive for the same lesion.
61510	Craniectomy, trephination, bone flap craniotomy; for excision of brain tumor, supratentorial, except meningioma	Used when the pathology is intra-axial brain tissue rather than the bone itself; if a case involves both a calvarial lesion and a separate intracranial tumor, each may be separately reportable with supporting documentation and modifier -59, but 61500 alone does not capture intracranial tumor excision.
62140	Cranioplasty for skull defect; up to 5 cm diameter	Reconstruction of the resulting calvarial defect is not included in 61500’s descriptor; when the surgeon reconstructs the defect with graft or implant material in the same operative session, this add-on-adjacent code family should be evaluated for separate reporting.
21029	Removal by contouring of benign tumor of facial bone (eg, fibrous dysplasia), extraoral	Applies to facial rather than calvarial bone; misapplication between these two code sets is a frequent audit finding when a lesion spans the fronto-orbital or temporal region.

Bundling Alert

CPT 61500 carries a 090-day global surgical package, so all routine postoperative wound care, suture removal, and uncomplicated follow-up visits within 90 days are bundled and not separately billable. Any unplanned return to the operating room for a complication (hematoma, CSF leak, infection) during the global period requires modifier -78, while a staged or planned second procedure uses -58. Because this is a major surgery code, payers will scrutinize claims where a large excision margin or extensive reconstruction is billed without documentation supporting medical necessity for the added work, so operative notes should explicitly state lesion size, margin planning, and any reconstruction performed.

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🌳 Code Tree — Surgery: Nervous System, Skull, Meninges, and Brain

CPT 61304-61576  Craniectomy or Craniotomy
│
├── 61458-61460  Craniectomy, Suboccipital
│   ├── 61458  Craniectomy, suboccipital; for exploration or decompression of cranial nerves
│   └── 61460  Craniectomy, suboccipital; for section of 1 or more cranial nerves
│
├── 61500-61501  Craniectomy for Bone Lesion
│   ├── ▶▶ 61500 ◀◀  Craniectomy; with excision of tumor or other bone lesion of skull  ← YOU ARE HERE  (Global: 090)
│   └── 61501  Craniectomy; for osteomyelitis  (Global: 090)
│
└── 61510-61576  Craniectomy for Brain Tumor Excision
    ├── 61510  Craniectomy, trephination, bone flap craniotomy; for excision of brain tumor, supratentorial, except meningioma
    └── 61512  Craniectomy, trephination, bone flap craniotomy; for excision of meningioma, supratentorial

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💰 RVU & Reimbursement Profile

Component	Value
Work RVU	18.70 — 2026 MPFS national value²
Global Period	090 — 1 day preoperative, day of procedure, and 90 days postoperative care²
Bilateral Indicator	0 — the skull is not a paired structure by CMS convention; bilateral billing is atypical and the 150% adjustment does not apply
Assistant Surgeon	Typically payable for this major open cranial procedure; verify the current CMS assistant-at-surgery indicator for 61500 in the live MPFS file before submission
Co‑Surgeon	May be payable with documentation when two surgeons of different specialties (e.g., neurosurgery and plastic surgery for reconstruction) perform distinct parts of the same session — verify indicator before appending -62
Team Surgery	Not typically applicable to a single-region calvarial excision
PC/TC Split	0 — physician service code; the PC/TC concept does not apply because this is a global surgical procedure, not a diagnostic test
Modifier -51 Exempt	No — subject to multiple-procedure reduction when billed with other same-session surgical codes
Anesthesia	General anesthesia; not separately billable by the surgeon

Bilateral Billing Rules

Because the skull is a single midline structure, 61500 is essentially never reported with modifier -50 in routine practice. In the rare case of two anatomically distinct**, separately excised calvarial lesions**, use modifier -59 with clear documentation of separate lesion sites rather than defaulting to a bilateral modifier.

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🏷️ Modifier Reference

Modifier	Name	When to Apply
-RT	Right Side	Append when the lesion and craniectomy are clearly localized to the right side of the skull per the operative note.
-LT	Left Side	Append when the lesion and craniectomy are clearly localized to the left side of the skull per the operative note.
-22	Increased Procedural Services	Use when documentation supports substantially greater work than typical — for example, an unusually large lesion, dense dural adhesion requiring extensive dissection, or extensive reconstruction — with a comparison statement in the note.
-24	Unrelated E/M During Postop Period	Append to an E/M code, not to 61500 itself, when the same physician evaluates the patient for an unrelated problem during the 90-day global period.
-51	Multiple Procedures	Applies when 61500 is reported with other significant, separately reportable procedures in the same operative session, subject to multiple-procedure payment reduction.
-57	Decision for Surgery	Append to the E/M code when the decision to perform this major surgery is made during an E/M visit on the day of or day before the procedure.
-58	Staged or Related Procedure	Use for a planned, staged return to the operating room during the global period, such as a planned second-stage reconstruction.
-59	Distinct Procedural Service	Use to unbundle a separately identifiable procedure performed at a different anatomic site or session that might otherwise be bundled under NCCI edits.
-62	Two Surgeons	Applies when two surgeons of different specialties each perform a distinct portion of the same procedure and each documents their own operative work.
-78	Return to OR	Applies to an unplanned return to the operating room during the global period for a complication related to the original surgery, such as postoperative hematoma or CSF leak.
-79	Unrelated Procedure	Applies when the same physician performs an unrelated procedure during the global period of 61500.
-80	Assistant Surgeon	Append when a physician assistant-at-surgery performs a documented, substantive role, subject to the code’s assistant surgeon payment indicator.
-81	Minimum Assistant Surgeon	Applies when assistant services are minimal, per payer documentation requirements.
-82	Assistant Surgeon (No Qualified Resident Available)	Applies at teaching facilities when a qualified resident was unavailable and the operative note documents this circumstance.
-AS	Non-Physician Assistant at Surgery	Applies when a PA, NP, or clinical nurse specialist serves as assistant at surgery.

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🩺 Common ICD‑10‑CM Pairings

Primary Diagnosis Group

ICD‑10	Description	HCC?	Notes
C41.0	Malignant neoplasm of bones of skull and face	✅ Yes	Primary calvarial malignancy; supports the highest specificity for a resected primary bone tumor and is HCC-relevant under the CMS-HCC malignancy category.
D16.4	Benign neoplasm of bones of skull and face	❌ No	Appropriate for osteoma or other confirmed benign lesions; do not use if final pathology returns malignant — update the diagnosis to reflect the confirmed pathology once available.
D48.0	Neoplasm of uncertain behavior of bone and articular cartilage	✅ Yes	Use when pathology is pending or indeterminate at the time of the initial claim; captured under the CMS-HCC malignancy-adjacent category in the current model.
C79.51	Secondary malignant neoplasm of bone	✅ Yes	Reports a metastatic skull deposit; sequence the primary malignancy code per ICD-10-CM guidelines when the primary site is known and documented.
C79.89	Secondary malignant neoplasm of other specified sites	✅ Yes	Use only if a more specific secondary neoplasm code is not available for the documented site.

Secondary Group

ICD‑10	Description	HCC?	Notes
R51.9	Headache, unspecified	❌ No	Supports medical necessity as a presenting symptom; do not use as a standalone justification without the underlying neoplasm diagnosis.
G93.89	Other specified disorders of brain	❌ No	May support documentation of mass effect from an expansile calvarial lesion when more specific codes do not apply.

Etiology / Complication

ICD‑10	Description	HCC?	Notes
M85.00	Fibrous dysplasia (monostotic), unspecified site	❌ No	Applicable when the underlying etiology of the excised lesion is fibrous dysplasia rather than a true neoplasm.
Q75.8	Other specified congenital malformations of skull and face bones	❌ No	Rarely applicable for congenital bone lesions presenting later in life; confirm against the documented etiology before assigning.

Coding Specificity Reminder

Always code to the highest level of specificity supported by pathology and operative documentation. Do not default to an uncertain-behavior code (D48.0) once final pathology has resulted — update the claim to C41.0 or D16.4 as appropriate, since payer edits increasingly flag uncertain-behavior codes reported after a definitive pathology report is on file.

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🏥 MS‑DRG Considerations

CPT 61500 groups on the inpatient side to MDC 01 (Diseases and Disorders of the Nervous System) within the Craniotomy and Endovascular Intracranial Procedures DRG family (MS-DRG 025–027), with final DRG assignment driven primarily by the ICD-10-CM principal diagnosis (malignant versus benign or uncertain-behavior lesion), presence of a CC or MCC among secondary diagnoses, and patient age over 64 in some groupers. There is no National Coverage Determination specific to skull tumor craniectomy, and a review of Noridian’s published LCD library (JE/JF) does not show an active local coverage determination restricting 61500 — coverage is instead governed by general Medicare medical necessity documentation requirements and the operative note supporting the excision.¹

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🔧 ICD‑10‑PCS Equivalents

PCS Code	Full Description	Modality
0NB00ZZ	Excision of Skull, Open Approach	Open surgical excision of a portion of the skull bone, the standard PCS equivalent for a straightforward tumor excision without margin resection of the entire structure.
0NB00ZX	Excision of Skull, Open Approach, Diagnostic	Used when the primary intent documented is diagnostic tissue sampling of an indeterminate calvarial lesion rather than definitive therapeutic excision.
0NT00ZZ	Resection of Skull, Open Approach	Applies when the entire anatomically defined body part (the involved skull segment) is cut out rather than a lesser excision — coder judgment based on operative extent is required.
0N500ZZ	Destruction of Skull, Open Approach	Applies only when the operative note describes ablation or destruction of lesion tissue in place rather than physical excision — uncommon for this code but included for completeness.

PCS Character Analysis

Position	Character	Value	Definition
1	Section	0	Medical and Surgical section, covering the vast majority of operative procedures including this craniectomy.
2	Body System	N	Head and Facial Bones, the ICD-10-PCS body system containing the skull body part value.
3	Root Operation	B	Excision — cutting out or off a portion of a body part without replacement, the correct root operation for a partial calvarial resection.
4	Body Part	0	Skull, the specific body part value within the Head and Facial Bones system used for calvarial procedures.
5	Approach	0	Open — the site is exposed via incision to reach the procedure site directly, consistent with a craniectomy.
6	Device	Z	No Device — no device is left in place following the excision itself; a separate PCS code is required if a graft or plate is placed.
7	Qualifier	Z	No Qualifier — no additional qualifier value applies to a standard open excision of skull.

Root Operation Comparison

• Excision (B) removes only a portion of the body part, matching most 61500 cases where a defined lesion with margin is taken and the remainder of the skull is preserved.
• Resection (T) removes an entire body part; use only if the operative note documents removal of the complete anatomically defined skull segment rather than a bordered lesion.
• Destruction (5) eradicates tissue without removing it; reserve for cases explicitly describing ablation rather than physical excision, which is not the typical technique for 61500.

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📝 Coding Examples

Example 1

Clinical Scenario:
A 58-year-old presents with a palpable, tender right parietal skull mass. CT shows a 2.8 cm lytic lesion with cortical destruction. The neurosurgeon performs a right parietal craniectomy with en bloc excision of the calvarial lesion; final pathology confirms metastatic renal cell carcinoma to bone.

Field	Code	Rationale
CPT	61500--RT	Reports the open craniectomy with excision of a bone lesion, side-specified to the right parietal region.
PDx	C79.51	Codes the confirmed secondary malignant neoplasm of bone; the primary renal malignancy should also be sequenced per documentation.

Note

Ensure the primary renal cell carcinoma diagnosis is also captured and sequenced correctly per ICD-10-CM guidelines for secondary neoplasms with a known primary site.

Example 2

Clinical Scenario:
A 41-year-old with progressive frontal bossing undergoes CT and MRI showing fibrous dysplasia of the left frontal bone. The surgeon performs a left frontal craniectomy with piecemeal contouring and excision of the dysplastic bone, followed by same-session cranioplasty with a titanium mesh implant to reconstruct the defect.

Field	Code	Rationale
CPT 1	61500--LT	Reports the primary craniectomy with excision of the benign fibro-osseous lesion.
CPT 2	62140--59	Reports the separately identifiable cranioplasty reconstruction performed in the same session, distinct from the excision itself.
PDx	M85.00	Codes fibrous dysplasia as the underlying diagnosis driving the excision.

Warning

Confirm payer-specific NCCI edit status between 61500 and the cranioplasty code before unbundling; some payers require strong documentation that the reconstruction is a distinct, medically necessary component rather than an integral part of closure.

Example 3

Clinical Scenario:
A 67-year-old with a known history of prostate cancer develops a painful, enlarging occipital skull mass. Imaging is indeterminate between metastasis and a primary bone tumor. The surgeon performs an excisional biopsy via craniectomy; pathology is pending at the time of claim submission.

Field	Code	Rationale
CPT	61500	Reports the craniectomy performed to excise the indeterminate calvarial lesion for diagnostic purposes.
PDx	D48.0	Codes the neoplasm of uncertain behavior appropriately while pathology is pending; update once final pathology results.

Global period reminder, if applicable

The 90-day global period begins on the date of this procedure; any follow-up visit to discuss final pathology results and next steps within that window is bundled unless it meets criteria for a separately reportable service.

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⚠️ Common Coding Pitfalls

• Pitfall 1: Reporting 61500 when the excised pathology is actually an intra-axial brain tumor rather than a bone lesion. Review the operative note and pathology report to confirm the specimen originated from calvarial bone before assigning this code.
• Pitfall 2: Continuing to report an uncertain-behavior diagnosis code (D48.0) after final pathology has confirmed a malignant or benign result. Update the claim to the definitive diagnosis once pathology is finalized to avoid a compliance flag.
• Pitfall 3: Separately billing routine wound closure, hemostasis, or bone wax placement as distinct procedures. These are bundled components of the craniectomy under the 090-day global surgical package.
• Pitfall 4: Failing to separately capture and report a same-session cranioplasty or dural repair when the operative note supports it as distinct, medically necessary work beyond the excision itself.
• Pitfall 5: Appending modifier -50 for a bilateral procedure without clear documentation of two anatomically distinct excised lesions; the skull’s bilateral indicator of 0 makes this an atypical and audit-prone combination.
• Pitfall 6: Omitting the primary malignancy code when reporting a secondary neoplasm of bone (C79.51), which can affect DRG assignment and risk-adjustment accuracy on the inpatient side.

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📎 Sources

1. Noridian Healthcare Solutions. *Local Coverage Determination (LCD) and Medical Policy Search — Jurisdictions JE/JF.* Noridian Healthcare Solutions, LLC; 2026. 2. Centers for Medicare & Medicaid Services. *2026 National Physician Fee Schedule Relative Value File (PPRRVU2026).* CMS Physician Fee Schedule Search Tool; 2026. 3. American Medical Association. *CPT® 2026 Professional Edition — Surgery, Nervous System, Skull, Meninges, and Brain.* AMA; 2026.

_{Sources listed above correspond to superscript citations throughout this note. Verify all Medicare payment figures against your current CMS PFS Lookup tool and applicable MAC LCD prior to claim submission. Please use the latest AAPC/AHIMA Coding Books to verify each code within this note.}