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Data Sources: Centers for Medicare & Medicaid Services (CMS), Medicare Provider Utilization and Payment Data
Disclaimer: This site is an independent journalism project. Data analysis and editorial content are not affiliated with or endorsed by CMS or any government agency. All spending figures are based on publicly available Medicare payment records.
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Methodologyโ€ขDownload Data
  1. Home
  2. Providers
  3. Natalie Alphonse Sullivan
๐ŸŽ—๏ธ
MDIndividual

Natalie Alphonse Sullivan, M.D.

NPI: 1003255761
Venice, FL
3 years of data
Radiation Oncology
$4.8M
Total Payments
6.6K
Beneficiaries
27.6K
Services
5.36x
Markup Ratio

Peer Comparison

97th
percentile in specialty
This provider$4.8M
Specialty median$300.5K

๐Ÿ“‹ Key Findings

1Billed $4.8M over 3 years
25.36x markup ratio (above median)
397th percentile in Radiation Oncology by payments
4Payments surged 87% in 2022
520 procedures with >3x markup
โœ“ No flags detected

๐Ÿ”Ž Data Analysis

This provider's $4.8M in total Medicare payments ranks in the 97th percentile of Radiation Oncology providers nationally.

Their average markup ratio of 5.36x is significantly above the specialty median of 5.0x.

Medicare payments to this provider grew 70% from 2021 to 2023.

AI-generated analysis based on Medicare payment data.

Annual Medicare Payments

Annual Services Provided

Avg Payment per Service

Markup Ratio Over Time

๐Ÿ“ˆ

Notable: Payments increased 87% in 2022

Year-over-year payment surges can indicate changes in practice volume, new services, or billing pattern shifts.

Submitted Charges vs. Medicare Payments

Average per-service amounts submitted by the provider compared to what Medicare actually paid โ€” the gap represents the markup.

YearAvg SubmittedAvg PaidMarkup RatioGap per ServiceTotal PaymentsServicesBeneficiaries
2021$1.2K$234.445.25x$996.56$1.1M6.2K1.3K
2022$1.4K$251.415.70x$1.2K$2.0M11.3K2.6K
2023$1.4K$241.835.74x$1.1K$1.8M10.1K2.6K

Top Procedures (20)

G6015Intensity modulated treatment delivery, single or multiple fields/arcs,via narrow spatially and temporally modulated beams, binary, dynamic mlc, per treatment sessionโš  4.9x markup
$1.9M
6.8K services$275.16/svc4.90x markup
77014Ct scan guidance for insertion of radiation therapy fieldsโš  7.3x markup
$494.9K
5.5K services$90.69/svc7.32x markup
77301Management of modulation radiotherapy planningโš  5.2x markup
$491.2K
351 services$1.4K/svc5.24x markup
G6012Radiation treatment delivery,3 or more separate treatment areas, custom blocking, tangential ports, wedges, rotational beam, compensators, electron beam; 6-10 mevโš  4.5x markup
$354.9K
2.0K services$181.62/svc4.49x markup
77427Radiation treatment management, 5 treatmentsโš  4.4x markup
$268.5K
1.8K services$150.53/svc4.38x markup
77373Cranial lesion surgery using radiation over multiple sessionsโš  7.2x markup
$192.6K
252 services$764.47/svc7.24x markup
G6002Stereoscopic x-ray guidance for localization of target volume for the delivery of radiation therapyโš  6.8x markup
$148.5K
2.7K services$55.76/svc6.85x markup
77336Radiation therapy consultation per weekโš  5.3x markup
$127.9K
2.0K services$63.60/svc5.31x markup
77338Design and construction of device for radiation therapyโš  5.2x markup
$126.0K
354 services$356.06/svc5.17x markup
G6013Radiation treatment delivery,3 or more separate treatment areas, custom blocking, tangential ports, wedges, rotational beam, compensators, electron beam; 11-19 mevโš  5.1x markup
$96.8K
539 services$179.65/svc5.08x markup
77300Calculation of radiation therapy doseโš  4.6x markup
$84.4K
1.7K services$50.64/svc4.61x markup
77263Management of radiation therapy, complexโš  4.6x markup
$72.0K
557 services$129.19/svc4.57x markup
77334Radiation treatment devices, design and construction, complexโš  5.7x markup
$69.0K
719 services$95.98/svc5.65x markup
77290Management of radiation therapy, simulation, complexโš  5.2x markup
$66.8K
189 services$353.24/svc5.24x markup
99204New patient outpatient visit, total time 45-59 minutesโš  4.4x markup
$61.3K
467 services$131.30/svc4.39x markup
77295Management of radiation therapy, 3dโš  10.2x markup
$58.7K
159 services$369.08/svc10.24x markup
77280Management of radiation therapy simulation, simpleโš  5.0x markup
$46.6K
226 services$206.27/svc5.03x markup
99213Established patient outpatient visit, total time 20-29 minutesโš  3.6x markup
$46.2K
661 services$69.88/svc3.56x markup
77293Respiratory motion management simulationโš  4.7x markup
$30.6K
96 services$318.96/svc4.70x markup
77435Management of cranial lesion surgery using radiation over multiple sessionsโš  4.8x markup
$25.0K
49 services$511.00/svc4.85x markup
Show detailed table โ–พ
CodeDescriptionServicesPaymentsAvg/ServiceMarkup
G6015Intensity modulated treatment delivery, single or multiple fields/arcs,via narrow spatially and temporally modulated beams, binary, dynamic mlc, per treatment session6.8K$1.9M$275.164.90x
77014Ct scan guidance for insertion of radiation therapy fields5.5K$494.9K$90.697.32x
77301Management of modulation radiotherapy planning351$491.2K$1.4K5.24x
G6012Radiation treatment delivery,3 or more separate treatment areas, custom blocking, tangential ports, wedges, rotational beam, compensators, electron beam; 6-10 mev2.0K$354.9K$181.624.49x
77427Radiation treatment management, 5 treatments1.8K$268.5K$150.534.38x
77373Cranial lesion surgery using radiation over multiple sessions252$192.6K$764.477.24x
G6002Stereoscopic x-ray guidance for localization of target volume for the delivery of radiation therapy2.7K$148.5K$55.766.85x
77336Radiation therapy consultation per week2.0K$127.9K$63.605.31x
77338Design and construction of device for radiation therapy354$126.0K$356.065.17x
G6013Radiation treatment delivery,3 or more separate treatment areas, custom blocking, tangential ports, wedges, rotational beam, compensators, electron beam; 11-19 mev539$96.8K$179.655.08x
77300Calculation of radiation therapy dose1.7K$84.4K$50.644.61x
77263Management of radiation therapy, complex557$72.0K$129.194.57x
77334Radiation treatment devices, design and construction, complex719$69.0K$95.985.65x
77290Management of radiation therapy, simulation, complex189$66.8K$353.245.24x
99204New patient outpatient visit, total time 45-59 minutes467$61.3K$131.304.39x
77295Management of radiation therapy, 3d159$58.7K$369.0810.24x
77280Management of radiation therapy simulation, simple226$46.6K$206.275.03x
99213Established patient outpatient visit, total time 20-29 minutes661$46.2K$69.883.56x
77293Respiratory motion management simulation96$30.6K$318.964.70x
77435Management of cranial lesion surgery using radiation over multiple sessions49$25.0K$511.004.85x

Markup Analysis

Charge-to-Payment Ratio

5.36x

This provider submits charges 5.36 times higher than what Medicare actually pays.

What This Means

A markup ratio of 5.36x means for every $100 Medicare pays, this provider initially charges $536. This is higher than the national average.

Location

Venice, FL

Provider Verification

Always verify provider credentials and location before scheduling appointments. This data reflects Medicare payments and may not include all practice locations.

Similar Providers

Other Radiation Oncology providers in FL for peer comparison.

Natalie Alphonse Sullivan (you)
$4.8M
Timothy Kerwin, MD
$42.2M
Scot Ackerman, MD
$37.7M
Constantine Mantz, MD
$33.8M
Show detailed table โ–พ
ProviderLocationTotal PaymentsStatus
Timothy Kerwin, MDNaples, FL$42.2Mโœ“ Clear
Scot Ackerman, MDJacksonville, FL$37.7Mโœ“ Clear
Constantine Mantz, MDCape Coral, FL$33.8Mโœ“ Clear

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Data Sources

  • โ€ข Centers for Medicare & Medicaid Services (CMS)
  • โ€ข Medicare Provider Utilization and Payment Data (2014-2023)
  • โ€ข National Plan and Provider Enumeration System (NPPES)

Last Updated: February 2026 (data through 2023, the latest CMS release)

Note: All data is from publicly available Medicare records. OpenMedicare is an independent journalism project not affiliated with CMS.

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