CPT 77318
Global XXX ActiveBrachytx isodose complex
CPT 77318 Billing & Documentation Guide
CPT code 77318 (Brachytx isodose complex) is classified under Radiology with a global period indicator of XXX. The 2026 Medicare Physician Fee Schedule assigns a work RVU of 2.83, a non-facility practice expense RVU of 10.84, and a malpractice RVU of 0.19, a total non-facility RVU of 13.86 and facility RVU of 13.86. With the current conversion factor of $33.4009, the national average non-facility reimbursement is approximately $479.75, though rates vary from $408.81 to $630.42 based on MAC locality and Geographic Practice Cost Indices (GPCIs).
When billing 77318, ensure documentation supports medical necessity and the specific components required for the code's level of service. For E/M codes, document MDM (medical decision-making) elements: problems addressed, data reviewed, and risk. For procedural codes, document the indication, technique, and any complications. Always verify NCCI edits before bundling 77318 with related codes; this code has 10 PTP bundling relationships on file (see table below).
Payment Status & Global Period
Active code (paid under MPFS)
No global period (E/M and other non-procedural services)
MUE Limit (Medically Unlikely Edits)
Submitting more than 1 units of 77318 for the same patient on the same date triggers automatic line denial unless an appropriate modifier and supporting documentation justify the higher quantity.
RVU Breakdown, CPT 77318
| Component | Non-Facility | Facility |
|---|---|---|
| Work RVU | 2.83 | 2.83 |
| Practice Expense RVU | 10.84 | 10.84 |
| Malpractice RVU | 0.19 | 0.19 |
| Total RVU | 13.86 | 13.86 |
| Conversion Factor | $33.4009 | |
2026 Medicare Reimbursement by State, CPT 77318
State-level averages across all MAC localities. Non-facility rates typically apply to office-based services; facility rates apply to hospital outpatient / inpatient.
| State | Non-Facility | Facility | Range (Non-Fac) | Localities |
|---|---|---|---|---|
| California | $529.78 | $529.78 | $496.36 - $630.42 | 29 |
| Florida | $470.15 | $470.15 | $450.2 - $487.48 | 3 |
| Georgia | $447.67 | $447.67 | $425.05 - $470.29 | 2 |
| Illinois | $456.83 | $456.83 | $435.01 - $478.27 | 4 |
| Michigan | $443.44 | $443.44 | $432.26 - $454.62 | 2 |
| North Carolina | $436.39 | $436.39 | $436.39 - $436.39 | 1 |
| New York | $511.56 | $511.56 | $442.95 - $542.86 | 5 |
| Ohio | $431.49 | $431.49 | $431.49 - $431.49 | 1 |
| Pennsylvania | $456.8 | $456.8 | $432.9 - $480.71 | 2 |
| Texas | $457.39 | $457.39 | $429.9 - $483.4 | 8 |
Source: CMS PFSRVU 2026 · Updated 2026-04-01. Full locality-level detail available for all 53 states, contact us for custom reports.
NCCI Bundling Edits, CPT 77318
Procedure-to-procedure (PTP) edits. If you bill any of these codes with 77318 on the same date of service, review the modifier indicator and payer policy before submission.
| Partner Code | Relationship | Modifier Allowed | Rationale |
|---|---|---|---|
| 0591T | Column 1 (primary), can be billed with modifier | Yes | CPT Manual or CMS manual coding instruction |
| 0592T | Column 1 (primary), can be billed with modifier | Yes | CPT Manual or CMS manual coding instruction |
| 0593T | Column 1 (primary), can be billed with modifier | Yes | CPT Manual or CMS manual coding instruction |
| 0596T | Column 1 (primary), can be billed with modifier | No | Standards of medical/surgical practice |
| 0597T | Column 1 (primary), can be billed with modifier | No | Standards of medical/surgical practice |
| 0694T | Column 1 (primary), can be billed with modifier | No | Misuse of Column Two code with Column One code |
| 11920 | Column 1 (primary), can be billed with modifier | No | Standards of medical/surgical practice |
| 11921 | Column 1 (primary), can be billed with modifier | No | Standards of medical/surgical practice |
| 16000 | Column 1 (primary), can be billed with modifier | No | Standards of medical/surgical practice |
| 16020 | Column 1 (primary), can be billed with modifier | No | Standards of medical/surgical practice |
Frequently Asked Questions, CPT 77318
What does CPT code 77318 mean? +
CPT code 77318 represents: Brachytx isodose complex. It's in the Radiology category with a global period of XXX.
What is the Medicare reimbursement for CPT 77318? +
The 2026 Medicare national average non-facility payment for CPT 77318 is $479.75. Rates range from $408.81 to $630.42 across 53 states depending on MAC locality and GPCIs.
What modifiers can I use with CPT 77318? +
Radiology codes rely heavily on the professional/technical split: modifier 26 (professional component only) and TC (technical component only). Also common: 50 (bilateral imaging), 76 (repeat by same physician), 77 (repeat by different physician), and LT/RT for laterality.
What bundling edits apply to CPT 77318? +
This code has 10 NCCI PTP bundling relationships. See the NCCI Bundling section below for full list.
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Reviewed by the PayerReady Medical Coding Team
Verified against the CMS 2026 code set on June 1, 2026.
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