CPT 77011Radiology

Ct scan for localization

CPT code 77011 covers a CT scan used to pinpoint the exact location of a tumor or treatment target before procedures like radiation therapy or biopsies. This imaging helps doctors identify precisely where to aim treatment beams or insert needles.

Showing rates for

National Average

Base Medicare rate

$211.55

This calculator gives a typical-case estimate using standard Medicare modifier rules. Actual payment depends on payer policies, documentation, code-specific CMS status indicators, and locality. Verify before billing.

RVU breakdown

Work RVU

1.21

PE RVU (NF)

5.25

MP RVU

0.08

Total RVU

6.54

Conversion factor: 32.3465 · Source: CMS MPFS RVU25A · Confidence: High

NCCI bundling edits

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Billing tips

Ensure documentation clearly distinguishes 77011 as a localization/treatment planning CT from a diagnostic CT scan (70000-74000 series)
Impact: Prevents denials for incorrect code selection which represent approximately 15-20% of 77011 claim rejections; protects full $211.55 reimbursement
Link 77011 to the appropriate oncology diagnosis code (C00-D49) and include the treatment planning radiation oncology code (77280-77295) when applicable
Impact: Establishes medical necessity and clinical context; reduces denial rate by 25-30% based on radiation oncology billing data
Bill 77011 separately from the therapeutic procedure it guides, using modifier 59 if necessary to unbundle from same-day services
Impact: Secures separate payment for localization imaging that might otherwise be bundled; preserves $211.55 versus $0 if incorrectly bundled
Do not bill 77011 with contrast material codes (e.g., Q9965-Q9967) as localization scans typically do not require contrast administration
Impact: Prevents unnecessary claim complexity and potential audit flags; contrast codes may trigger payer review or delay payment
Verify that 77011 is not billed on the same day as comprehensive diagnostic CT codes for the same anatomic region without clear documentation of separate medical necessity
Impact: Avoids NCCI edits and bundling denials; approximately 30% of 77011 denials involve same-day CT imaging conflicts
For hospital facility billing, ensure the appropriate revenue code (0350 for CT scan) is paired with 77011 on the UB-04 claim form
Prevents technical claim rejections and processing delays; mismatched revenue codes cause 10-15% of initial facility claim denials

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Frequently asked questions

What is the difference between CPT 77011 and a regular diagnostic CT scan?

CPT 77011 is specifically for CT imaging used to localize a target for treatment planning or procedural guidance, not for diagnostic evaluation. Diagnostic CT scans (70000-74000 series) are used to identify or evaluate disease, while 77011 establishes precise coordinates for subsequent therapeutic interventions like radiation therapy. The intent and use of the images determine the correct code.

How much does Medicare pay for CPT code 77011 in 2025?

Medicare pays $211.55 for CPT 77011 in 2025 under the national average non-facility rate. This represents 6.54 total RVUs (1.21 work RVU, 5.25 practice expense RVU, and 0.08 malpractice RVU) multiplied by the 2025 conversion factor of 32.3465. Actual payment may vary based on geographic location and facility versus non-facility setting.

Can CPT 77011 be billed with the same-day radiation treatment planning codes?

Yes, 77011 is typically billed with radiation treatment planning codes (77280-77295) as the CT localization is an integral part of the planning process. However, ensure documentation clearly shows both services were performed and are separately reportable. Some payers may require modifier 59 to indicate distinct services, though 77011 is generally recognized as separately billable from planning codes.

What modifier should I use when billing only the professional component of 77011?

Use modifier 26 when billing only the professional component (physician interpretation) of CPT 77011. This applies when the physician reads and interprets the CT localization images but does not own the equipment or employ the technologist. The technical component would be billed separately by the facility using modifier TC.

How often can CPT 77011 be billed during a radiation therapy treatment course?

There is no universal Medicare frequency limit for 77011, but medical necessity must be established for each instance. Typically, one CT localization is performed during initial treatment planning, though repeat imaging may be justified for adaptive radiation therapy, significant anatomical changes, or treatment re-planning. Documentation must support the clinical need for additional localization scans beyond the initial planning session.

Does CPT 77011 require contrast material administration?

No, CPT 77011 does not typically require or include contrast material administration. CT localization scans are usually performed without contrast to establish anatomical coordinates and treatment fields. If contrast is used for specific clinical reasons, it should be billed separately with appropriate contrast material codes, though this is uncommon for standard localization procedures.

What diagnosis codes are typically used with CPT 77011?

CPT 77011 is most commonly linked to malignant neoplasm diagnosis codes (C00-C96 series) when used for radiation therapy planning. The specific diagnosis should reflect the target lesion or treatment area. For non-oncology applications like stereotactic procedures, appropriate diagnosis codes for the target condition (e.g., arteriovenous malformation, benign tumors) should be used. The diagnosis must justify the medical necessity for CT-based localization.