CPT 77431Radiology

Radiation therapy management

CPT code 77431 covers the professional work of managing a patient's radiation therapy treatment, including review of treatment plans, monitoring patient response, and adjusting therapy as needed during one to two treatment sessions.

Showing rates for

National Average

Base Medicare rate

$106.10

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

1.81

PE RVU (NF)

1.31

MP RVU

0.16

Total RVU

3.28

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

NCCI bundling edits

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Billing tips

Do not bill 77431 for the same treatment period covered by weekly management codes (77427, 77431, 77432, or 77435); use 77431 only for 1-2 fractions not included in other management codes
Impact: Prevents bundling denials that would result in $106.10 loss per claim and potential refund demands for previously paid services
Document the specific fractions managed, patient assessment findings, treatment parameters reviewed, and any modifications made to the treatment plan in the medical record
Impact: Reduces audit risk and denial rate by 60-70%; missing documentation is the primary cause of recoupment in radiation oncology audits
Bill 77431 only when the physician personally provides medical evaluation and management; chart review alone or physicist-only consultations do not qualify
Impact: Prevents fraud allegations and ensures compliance; improper billing can trigger OIG investigation and penalties exceeding 3-4x the $106.10 payment
Consider using 77427 (weekly management for 5 fractions) instead when appropriate, as it provides higher reimbursement efficiency for standard treatment courses
Impact: 77427 reimburses at approximately $268 for 5 fractions versus $212.20 for two units of 77431, saving administrative burden
Verify that the treatment dates on the claim match the fractions documented in the treatment management note; date mismatches are a common audit trigger
Impact: Eliminates 30-40% of technical denials that require costly appeals and delay payment by 45-60 days
For patients receiving simultaneous treatment to multiple sites, document medical necessity for same-day management of both sites if billing 77431 twice with modifier 59 or XE

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Frequently asked questions

What is the Medicare reimbursement rate for CPT 77431 in 2025?

The 2025 Medicare national average reimbursement rate for CPT 77431 is $106.10 for both facility and non-facility settings. This rate is based on 3.28 total RVUs (1.81 work RVU, 1.31 practice expense RVU, 0.16 malpractice RVU) multiplied by the 2025 conversion factor of 32.3465.

How many fractions does CPT 77431 cover?

CPT 77431 covers radiation treatment management for one or two fractions of radiation therapy. If you are managing more fractions, you should use different codes: 77427 for 3-5 fractions, 77431 for 1-2 fractions, 77432 for stereotactic body radiation therapy, or 77435 for intensity modulated radiation therapy.

Can I bill CPT 77431 on the same day as an E/M visit?

Generally no, because the physician work for patient evaluation and management is already included in the 77431 service. Billing a separate E/M code (99211-99215) on the same day would require clearly distinct and separately identifiable evaluation for an unrelated problem, documented with modifier 25, and most payers will deny this as bundled services unless exceptional circumstances are demonstrated.

What is the difference between CPT 77431 and 77427?

CPT 77427 is for weekly radiation treatment management covering 3-5 fractions, while CPT 77431 covers only 1-2 fractions. Code 77427 reimburses at a higher rate and is more appropriate for standard weekly oversight during a radiation course. Use 77431 for short treatment courses or interim management visits that fall outside your weekly management schedule.

How often can I bill CPT 77431 during a radiation treatment course?

You can bill 77431 for each 1-2 fractions managed, but you cannot bill it for the same fractions covered by other management codes. Most radiation courses use weekly management codes (77427), so 77431 is typically reserved for the initial 1-2 fractions before weekly billing begins, the final 1-2 fractions after weekly billing ends, or for patients receiving very short courses (1-2 total fractions). Overlapping billing triggers automatic denials.

What documentation is required to support billing CPT 77431?

Required documentation includes the specific treatment fractions being managed, review of treatment parameters and dose delivery, review of port images or setup verification, patient examination findings, assessment of treatment tolerance and toxicities, medical decision-making regarding treatment continuation or modification, and physician signature. The note must demonstrate direct physician involvement beyond routine physicist or therapist oversight.

Can radiation oncology residents bill CPT 77431?

Residents cannot independently bill 77431, but the teaching physician can bill using modifier GC when the resident provides the service under direct supervision. The teaching physician must be present for critical portions of the service, personally review the patient, and document their involvement. The resident's note alone is insufficient; the attending must document their personal participation in treatment management and decision-making.