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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. Erin Chamberlain
๐ŸŽ—๏ธ
MDI

Erin Chamberlain, M.D.

NPI: 1902249469
San Luis Obispo, CA
10 years of data
Hematology-Oncology
$1.9M
Total Payments
2.6K
Beneficiaries
114.0K
Services
28.09x
Markup Ratio

Peer Comparison

91th
percentile in specialty
This provider$1.9M
Specialty median$339.6K

๐Ÿ“‹ Key Findings

1Billed $1.9M over 10 years
228.09x markup ratio (above median)
3Risk score: 67 โ€” flagged for review
491th percentile in Hematology-Oncology by payments
510 procedures with >3x markup

โš ๏ธ Flagged for Review

Risk Score: 67
  • 30x specialty median spending
  • Markup 28.1x (specialty median: 4.0x)
  • 6x specialty median beneficiaries
  • 136x specialty median services
View Deep Dives โ†’Report Fraud โ†’

Statistical flag only โ€” not an accusation of fraud

๐Ÿ”Ž Data Analysis

This provider's $1.9M in total Medicare payments ranks in the 91th percentile of Hematology-Oncology providers nationally.

Their average markup ratio of 28.09x is significantly above the specialty median of 3.5x.

Medicare payments to this provider grew 77% from 2014 to 2023.

This provider has been statistically flagged with a risk score of 67/100. Statistical flags are not accusations of fraud.

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$476.13$16.9528.09x$459.18$135.2K8.0K186
2015$476.13$16.9528.09x$459.18$146.8K8.7K202
2016$476.13$16.9528.09x$459.18$158.4K9.3K218
2017$476.13$16.9528.09x$459.18$170.0K10.0K234
2018$476.13$16.9528.09x$459.18$181.6K10.7K250
2019$476.13$16.9528.09x$459.18$193.2K11.4K266
2020$476.13$16.9528.09x$459.18$204.8K12.1K282
2021$476.13$16.9528.09x$459.18$216.4K12.8K298
2022$476.13$16.9528.09x$459.18$227.9K13.4K314
2023$476.13$16.9528.09x$459.18$239.5K14.1K330

Top Procedures (10)

99213Office/outpatient visit, est patient, lowโš  29.2x markup
$659.5K
38.9K services$16.95/svc29.23x markup
99214Office/outpatient visit, est patient, moderateโš  29.4x markup
$329.8K
19.5K services$16.95/svc29.37x markup
99215Office/outpatient visit, est patient, highโš  24.8x markup
$219.8K
13.0K services$16.95/svc24.80x markup
99223Initial hospital care, high complexityโš  29.2x markup
$164.9K
9.7K services$16.95/svc29.21x markup
99232Subsequent hospital care, moderateโš  24.5x markup
$131.9K
7.8K services$16.95/svc24.50x markup
93000Electrocardiogram, completeโš  31.2x markup
$109.9K
6.5K services$16.95/svc31.19x markup
71046Chest X-ray, 2 viewsโš  33.1x markup
$94.2K
5.6K services$16.95/svc33.11x markup
80053Comprehensive metabolic panelโš  27.0x markup
$82.4K
4.9K services$16.95/svc26.98x markup
85025Complete blood count (CBC)โš  25.1x markup
$73.3K
4.3K services$16.95/svc25.14x markup
36415Venipunctureโš  23.2x markup
$66.0K
3.9K services$16.95/svc23.23x markup
Show detailed table โ–พ
CodeDescriptionServicesPaymentsAvg/ServiceMarkup
99213Office/outpatient visit, est patient, low38.9K$659.5K$16.9529.23x
99214Office/outpatient visit, est patient, moderate19.5K$329.8K$16.9529.37x
99215Office/outpatient visit, est patient, high13.0K$219.8K$16.9524.80x
99223Initial hospital care, high complexity9.7K$164.9K$16.9529.21x
99232Subsequent hospital care, moderate7.8K$131.9K$16.9524.50x
93000Electrocardiogram, complete6.5K$109.9K$16.9531.19x
71046Chest X-ray, 2 views5.6K$94.2K$16.9533.11x
80053Comprehensive metabolic panel4.9K$82.4K$16.9526.98x
85025Complete blood count (CBC)4.3K$73.3K$16.9525.14x
36415Venipuncture3.9K$66.0K$16.9523.23x

Markup Analysis

Charge-to-Payment Ratio

28.09x

This provider submits charges 28.09 times higher than what Medicare actually pays.

What This Means

A markup ratio of 28.09x means for every $100 Medicare pays, this provider initially charges $2809. This is higher than the national average.

Location

San Luis Obispo, CA

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 Hematology-Oncology providers in CA for peer comparison.

Erin Chamberlain (you)
$1.9M
Luke Dreisbach, M.D.
$77.2M
Sachin Gupta, M.D.
$55.1M
Ravi Rao, MDโš ๏ธ
$49.1M
Michael Sherman, M.D., PHD
$38.9M
Nerses Tchekmedyian, M.D.
$38.0M
Show detailed table โ–พ
ProviderLocationTotal PaymentsStatus
Luke Dreisbach, M.D.Rancho Mirage, CA$77.2Mโœ“ Clear
Sachin Gupta, M.D.Fresno, CA$55.1Mโœ“ Clear
Ravi Rao, MDFresno, CA$49.1Mโš ๏ธ Flagged
Michael Sherman, M.D., PHDWalnut Creek, CA$38.9Mโœ“ Clear
Nerses Tchekmedyian, M.D.Irvine, CA$38.0Mโœ“ 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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