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SRT CPT Codes

The complete SRT
billing framework.

SRT billing spans treatment delivery, simulation, dosimetry, physics, and physician management — each with its own CPT code and documentation requirement. Most practices underbill because they miss the ancillary codes.

CPT CodeDescriptionBilling Type
77401Radiation treatment delivery — superficial, per fraction. Billed each session of the treatment series.
Per Fraction
77261–77263Radiation treatment planning — simple, intermediate, complex. Billed once per treatment course.
Per Course
77300Basic radiation dosimetry calculation. Typically billed once per site per treatment series.
Per Course
77336Continuing medical physics consultation — billed weekly during treatment. Frequently missed.
● Often Missed
77427Radiation treatment management — 5 fractions. Physician supervision component, billed per 5-fraction block.
● High Value
G6003Radiation treatment delivery, custom block fabrication — used by some payers in lieu of 77401.
● Payer-Specific
What Most Practices Miss

SRT underbilling is
extremely common.

We regularly find that new SRT clients were collecting 60–75% of their eligible reimbursement before engaging us — primarily from missed ancillary codes and incomplete treatment management billing.

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Weekly physics consultation (77336)Billed each week treatment is ongoing — the single most commonly missed SRT code in our audits.
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Treatment management per 5 fractions (77427)Many practices bill the delivery codes but neglect the physician management component entirely.
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Correct planning level (77261–77263)Upcoding to complex when simple applies — or downcoding complex to simple — are both common errors with audit implications.
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Multi-site treatment separationWhen treating multiple sites on the same date, each site may qualify for separate billing if documentation supports.
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Payer pre-authorizationMedicare doesn't require auth for SRT, but UHC, Cigna, and Aetna often do. We track each payer's current policy.

Are you capturing all your
SRT revenue?

We'll audit your last 60 days of SRT claims for missed codes, planning level errors, and management component gaps — at no cost.

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