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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. Timothy Kerwin
๐ŸŽ—๏ธ
MDIndividual

Timothy Kerwin, MD

NPI: 1346309085
Naples, FL
10 years of data
Radiation Oncology
$42.2M
Total Payments
268
Beneficiaries
252.2K
Services
5.29x
Markup Ratio

Peer Comparison

99th
percentile in specialty
This provider$42.2M
Specialty median$300.5K
Rank #2 of 5 in specialty

๐Ÿ“‹ Key Findings

1Billed $42.2M over 10 years
25.29x markup ratio (above median)
399th percentile in Radiation Oncology by payments
4101 services/day โ€” unusually high
520 procedures with >3x markup

This provider averages 101 services per working day

Based on 252.2K total services over 10 years (250 working days/year). Learn about impossible service volumes โ†’

๐Ÿ”Ž Data Analysis

This provider's $42.2M in total Medicare payments ranks in the 99th percentile of Radiation Oncology providers nationally.

Their average markup ratio of 5.29x is significantly above the specialty median of 5.0x.

Averaging 101 services per working day raises questions about billing patterns.

AI-generated analysis based on Medicare payment data.

Annual Medicare Payments

Annual Services Provided

Avg Payment per Service

Markup Ratio Over Time

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
2014$742.77$151.064.92x$591.71$4.1M27.2K28
2015$818.44$164.334.98x$654.11$5.3M32.4K26
2016$848.96$161.215.27x$687.75$4.6M28.5K26
2017$904.36$159.965.65x$744.40$3.8M23.7K29
2018$975.69$163.595.96x$812.10$4.6M28.4K28
2019$977.58$162.376.02x$815.21$4.9M30.1K32
2020$996.87$169.305.89x$827.57$5.4M31.9K31
2021$1.0K$186.485.42x$824.89$3.2M17.1K23
2022$745.57$193.673.85x$551.90$2.8M14.4K22
2023$749.82$185.824.04x$564.00$3.4M18.4K23

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  5.9x markup
$17.3M
58.7K services$293.93/svc5.88x markup
77014Ct guidance for insertion of radiation therapy fieldsโš  6.4x markup
$5.8M
59.0K services$97.91/svc6.38x markup
77301High precision radiation therapy planningโš  4.5x markup
$3.4M
2.1K services$1.6K/svc4.48x markup
77427Radiation treatment management, 5 treatment sessionsโš  4.0x markup
$2.4M
15.2K services$155.49/svc3.99x markup
77300Calculation of radiation therapy doseโš  4.2x markup
$2.2M
41.6K services$53.99/svc4.18x markup
G6012Radiation treatment delivery,3 or more separate treatment areas, custom blocking, tangential ports, wedges, rotational beam, compensators, electron beam; 6-10 mevโš  4.0x markup
$2.1M
10.1K services$204.35/svc4.05x markup
77418Intensity modulated radiation treatment delivery per sessionโš  5.2x markup
$1.9M
6.1K services$320.05/svc5.24x markup
77338Design and construction of radiation treatment device for high precision radiation therapyโš  4.1x markup
$1.0M
2.6K services$403.23/svc4.06x markup
77336Continuing radiation therapy consultation per weekโš  3.6x markup
$1.0M
15.3K services$65.76/svc3.61x markup
77373Cranial lesion surgery using radiation over multiple sessionsโš  5.2x markup
$626.9K
648 services$967.44/svc5.17x markup
G6002Stereoscopic x-ray guidance for localization of target volume for the delivery of radiation therapyโš  6.2x markup
$572.0K
9.4K services$60.98/svc6.16x markup
G6013Radiation treatment delivery,3 or more separate treatment areas, custom blocking, tangential ports, wedges, rotational beam, compensators, electron beam; 11-19 mevโš  4.3x markup
$537.5K
2.5K services$212.63/svc4.33x markup
77280Obtaining data needed to develop the optimal radiation treatment, 1 treatment areaโš  3.3x markup
$518.0K
2.4K services$220.41/svc3.27x markup
77334Design and construction of complex radiation treatment deviceโš  4.7x markup
$484.3K
4.5K services$107.55/svc4.72x markup
77290Obtaining data needed to develop the optimal radiation treatment, 3 or more treatment areas or any number of treatment areas where special treatment is involvedโš  4.4x markup
$481.8K
1.2K services$402.86/svc4.41x markup
77263Complex radiation therapy planningโš  4.2x markup
$413.7K
3.0K services$136.61/svc4.21x markup
99205New patient office or other outpatient visit, 60-74 minutesโš  3.9x markup
$221.2K
1.3K services$176.38/svc3.85x markup
772953d radiation therapy planningโš  5.0x markup
$220.9K
559 services$395.25/svc4.99x markup
77421X-ray guidance for radiation therapy deliveryโš  5.9x markup
$94.8K
1.6K services$59.88/svc5.92x markup
99203New patient office or other outpatient visit, typically 30 minutesโš  4.3x markup
$93.8K
1.1K services$88.62/svc4.34x 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 session58.7K$17.3M$293.935.88x
77014Ct guidance for insertion of radiation therapy fields59.0K$5.8M$97.916.38x
77301High precision radiation therapy planning2.1K$3.4M$1.6K4.48x
77427Radiation treatment management, 5 treatment sessions15.2K$2.4M$155.493.99x
77300Calculation of radiation therapy dose41.6K$2.2M$53.994.18x
G6012Radiation treatment delivery,3 or more separate treatment areas, custom blocking, tangential ports, wedges, rotational beam, compensators, electron beam; 6-10 mev10.1K$2.1M$204.354.05x
77418Intensity modulated radiation treatment delivery per session6.1K$1.9M$320.055.24x
77338Design and construction of radiation treatment device for high precision radiation therapy2.6K$1.0M$403.234.06x
77336Continuing radiation therapy consultation per week15.3K$1.0M$65.763.61x
77373Cranial lesion surgery using radiation over multiple sessions648$626.9K$967.445.17x
G6002Stereoscopic x-ray guidance for localization of target volume for the delivery of radiation therapy9.4K$572.0K$60.986.16x
G6013Radiation treatment delivery,3 or more separate treatment areas, custom blocking, tangential ports, wedges, rotational beam, compensators, electron beam; 11-19 mev2.5K$537.5K$212.634.33x
77280Obtaining data needed to develop the optimal radiation treatment, 1 treatment area2.4K$518.0K$220.413.27x
77334Design and construction of complex radiation treatment device4.5K$484.3K$107.554.72x
77290Obtaining data needed to develop the optimal radiation treatment, 3 or more treatment areas or any number of treatment areas where special treatment is involved1.2K$481.8K$402.864.41x
77263Complex radiation therapy planning3.0K$413.7K$136.614.21x
99205New patient office or other outpatient visit, 60-74 minutes1.3K$221.2K$176.383.85x
772953d radiation therapy planning559$220.9K$395.254.99x
77421X-ray guidance for radiation therapy delivery1.6K$94.8K$59.885.92x
99203New patient office or other outpatient visit, typically 30 minutes1.1K$93.8K$88.624.34x

Markup Analysis

Charge-to-Payment Ratio

5.29x

This provider submits charges 5.29 times higher than what Medicare actually pays.

What This Means

A markup ratio of 5.29x means for every $100 Medicare pays, this provider initially charges $529. This is higher than the national average.

Location

Naples, 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.

Timothy Kerwin (you)
$42.2M
Scot Ackerman, MD
$37.7M
Constantine Mantz, MD
$33.8M
Show detailed table โ–พ
ProviderLocationTotal PaymentsStatus
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.

Believe this data is inaccurate? Dispute this data