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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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Methodology•Download Data
  1. Home
  2. Providers
  3. William Chafin
⚕️
MDIndividual

William Chafin, M.D.

NPI: 1225122716
Athens, GA
10 years of data
Rheumatology
$26.1M
Total Payments
336
Beneficiaries
2.5M
Services
2.67x
Markup Ratio

Peer Comparison

99th
percentile in specialty
This provider$26.1M
Specialty median$352.6K

📋 Key Findings

1Billed $26.1M over 10 years
22.67x markup ratio (above median)
399th percentile in Rheumatology by payments
4990 services/day — physically implausible
5Payments surged 70% in 2015
69 procedures with >3x markup

⚠️ This provider averages 990 services per working day — physically unusual for an individual practitioner

Based on 2.5M total services over 10 years (250 working days/year). Learn about impossible service volumes →

🔎 Data Analysis

This provider's $26.1M in total Medicare payments ranks in the 99th percentile of Rheumatology providers nationally.

Averaging 990 services per working day raises questions about billing patterns.

Medicare payments to this provider grew 374% from 2014 to 2023.

AI-generated analysis based on Medicare payment data.

Annual Medicare Payments

Annual Services Provided

Avg Payment per Service

Markup Ratio Over Time

📈

Notable: Payments increased 70% in 2015

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 — the gap represents the markup.

YearAvg SubmittedAvg PaidMarkup RatioGap per ServiceTotal PaymentsServicesBeneficiaries
2014$85.70$36.862.33x$48.84$701.9K19.0K20
2015$73.60$32.922.24x$40.68$1.2M36.2K33
2016$51.43$21.132.43x$30.30$1.6M73.4K39
2017$29.65$12.702.33x$16.95$2.3M184.7K40
2018$31.97$12.202.62x$19.77$3.0M249.6K39
2019$27.44$10.242.68x$17.20$3.2M316.5K30
2020$27.04$10.582.56x$16.46$3.6M339.4K35
2021$24.31$9.422.58x$14.89$3.6M383.9K34
2022$23.64$7.912.99x$15.73$3.4M435.3K33
2023$23.98$7.593.16x$16.39$3.3M438.2K33

Top Procedures (20)

J0129Injection, abatacept, 10 mg (code may be used for medicare when drug administered under the direct supervision of a physician, not for use when drug is self administered)
$8.4M
221.4K services$37.75/svc2.35x markup
J0717Injection, certolizumab pegol, 1 mg (code may be used for medicare when drug administered under the direct supervision of a physician, not for use when drug is self administered)
$8.1M
1.5M services$5.41/svc2.80x markup
J1602Injection, golimumab, 1 mg, for intravenous use
$2.3M
140.1K services$16.15/svc2.79x markup
J3262Injection, tocilizumab, 1 mg
$2.0M
482.5K services$4.24/svc2.40x markup
J9310Injection, rituximab, 100 mg
$1.2M
2.0K services$607.61/svc1.85x markup
J9312Injection, rituximab, 10 mg
$987.1K
14.2K services$69.40/svc2.53x markup
99214Established patient office or other outpatient visit, 30-39 minutes⚠ 3.0x markup
$949.8K
12.4K services$76.79/svc3.03x markup
96413Administration of chemotherapy into vein, 1 hour or less⚠ 5.0x markup
$394.1K
4.0K services$99.37/svc5.03x markup
J1745Injection infliximab, 10 mg
$268.6K
4.6K services$58.19/svc2.23x markup
J0897Injection, denosumab, 1 mg⚠ 3.4x markup
$260.4K
20.4K services$12.76/svc3.37x markup
96401Non-hormonal anti-neoplastic chemotherapy beneath the skin or into muscle⚠ 5.2x markup
$154.0K
2.7K services$57.90/svc5.18x markup
99213Established patient office or other outpatient visit, 20-29 minutes
$114.4K
2.3K services$48.88/svc2.51x markup
80053Blood test, comprehensive group of blood chemicals⚠ 4.7x markup
$101.4K
8.6K services$11.84/svc4.68x markup
96365Infusion into a vein for therapy, prevention, or diagnosis, 1 hour or less
$89.8K
1.8K services$49.18/svc2.71x markup
99204New patient office or other outpatient visit, 45-59 minutes
$77.8K
718 services$108.30/svc2.27x markup
85025Complete blood cell count (red cells, white blood cell, platelets), automated test and automated differential white blood cell count⚠ 3.7x markup
$75.8K
8.6K services$8.81/svc3.66x markup
20610Aspiration and/or injection of fluid from large joint⚠ 6.3x markup
$72.3K
1.7K services$41.55/svc6.29x markup
96372Injection of drug or substance under skin or into muscle
$65.8K
5.4K services$12.11/svc2.93x markup
73120X-ray of hand, 2 views⚠ 4.5x markup
$53.6K
2.8K services$18.86/svc4.46x markup
86140Measurement c-reactive protein for detection of infection or inflammation⚠ 5.1x markup
$45.3K
7.8K services$5.84/svc5.13x markup
Show detailed table ▾
CodeDescriptionServicesPaymentsAvg/ServiceMarkup
J0129Injection, abatacept, 10 mg (code may be used for medicare when drug administered under the direct supervision of a physician, not for use when drug is self administered)221.4K$8.4M$37.752.35x
J0717Injection, certolizumab pegol, 1 mg (code may be used for medicare when drug administered under the direct supervision of a physician, not for use when drug is self administered)1.5M$8.1M$5.412.80x
J1602Injection, golimumab, 1 mg, for intravenous use140.1K$2.3M$16.152.79x
J3262Injection, tocilizumab, 1 mg482.5K$2.0M$4.242.40x
J9310Injection, rituximab, 100 mg2.0K$1.2M$607.611.85x
J9312Injection, rituximab, 10 mg14.2K$987.1K$69.402.53x
99214Established patient office or other outpatient visit, 30-39 minutes12.4K$949.8K$76.793.03x
96413Administration of chemotherapy into vein, 1 hour or less4.0K$394.1K$99.375.03x
J1745Injection infliximab, 10 mg4.6K$268.6K$58.192.23x
J0897Injection, denosumab, 1 mg20.4K$260.4K$12.763.37x
96401Non-hormonal anti-neoplastic chemotherapy beneath the skin or into muscle2.7K$154.0K$57.905.18x
99213Established patient office or other outpatient visit, 20-29 minutes2.3K$114.4K$48.882.51x
80053Blood test, comprehensive group of blood chemicals8.6K$101.4K$11.844.68x
96365Infusion into a vein for therapy, prevention, or diagnosis, 1 hour or less1.8K$89.8K$49.182.71x
99204New patient office or other outpatient visit, 45-59 minutes718$77.8K$108.302.27x
85025Complete blood cell count (red cells, white blood cell, platelets), automated test and automated differential white blood cell count8.6K$75.8K$8.813.66x
20610Aspiration and/or injection of fluid from large joint1.7K$72.3K$41.556.29x
96372Injection of drug or substance under skin or into muscle5.4K$65.8K$12.112.93x
73120X-ray of hand, 2 views2.8K$53.6K$18.864.46x
86140Measurement c-reactive protein for detection of infection or inflammation7.8K$45.3K$5.845.13x

Markup Analysis

Charge-to-Payment Ratio

2.67x

This provider submits charges 2.67 times higher than what Medicare actually pays.

What This Means

A markup ratio of 2.67x means for every $100 Medicare pays, this provider initially charges $267. This is higher than the national average.

Location

Athens, GA

Provider Verification

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

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Data Sources

  • • Centers for Medicare & Medicaid Services (CMS)
  • • Medicare Provider Utilization and Payment Data (2014-2023)
  • • 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