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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. William Westerkam
๐Ÿฆด
MDIndividual

William Westerkam, MD

NPI: 1255303103
Columbia, SC
10 years of data
Physical Medicine and Rehabilitation
$3.8M
Total Payments
32.3K
Beneficiaries
78.6K
Services
2.87x
Markup Ratio

Peer Comparison

99th
percentile in specialty
This provider$3.8M
Specialty median$111.8K

๐Ÿ“‹ Key Findings

1Billed $3.8M over 10 years
22.87x markup ratio (above median)
399th percentile in Physical Medicine and Rehabilitation by payments
45 procedures with >3x markup
โœ“ No flags detected

๐Ÿ”Ž Data Analysis

This provider's $3.8M in total Medicare payments ranks in the 99th percentile of Physical Medicine and Rehabilitation providers nationally.

This provider's billing patterns fall within normal ranges for their specialty.

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$242.51$78.553.09x$163.96$379.4K8.0K3.3K
2015$237.41$80.762.94x$156.65$370.0K8.0K3.3K
2016$228.71$77.722.94x$150.99$364.2K7.9K3.2K
2017$232.85$77.922.99x$154.93$361.4K8.2K3.1K
2018$232.85$76.693.04x$156.16$377.7K9.0K3.2K
2019$261.44$85.453.06x$175.99$354.0K8.1K3.0K
2020$260.36$90.512.88x$169.85$337.2K6.8K3.0K
2021$253.33$88.942.85x$164.39$355.9K6.7K3.2K
2022$249.41$87.382.85x$162.03$424.6K8.0K3.4K
2023$260.80$94.192.77x$166.61$460.0K7.9K3.5K

Top Procedures (18)

99231Subsequent hospital inpatient care, typically 15 minutes per dayโš  3.7x markup
$1.3M
42.6K services$29.99/svc3.73x markup
99232Subsequent hospital inpatient care, typically 25 minutes per day
$986.1K
18.1K services$54.57/svc2.29x markup
99222Initial hospital inpatient care, typically 50 minutes per day
$411.0K
4.1K services$100.54/svc1.94x markup
95911Nerve transmission studies, 9-10 studies
$300.8K
1.9K services$156.35/svc2.89x markup
99238Hospital discharge day management, 30 minutes or less
$237.9K
4.4K services$54.39/svc2.21x markup
95886Needle measurement and recording of electrical activity of muscles of arm or leg complete study
$205.2K
2.9K services$70.33/svc2.66x markup
95910Nerve transmission studies, 7-8 studies
$73.7K
569 services$129.61/svc2.88x markup
95909Nerve transmission studies, 5-6 studies
$72.1K
741 services$97.33/svc2.91x markup
95912Nerve transmission studies, 11-12 studiesโš  3.5x markup
$52.7K
294 services$179.36/svc3.47x markup
G0180Physician certification for medicare-covered home health services under a home health plan of care (patient not present), including contacts with home health agency and review of reports of patient status required by physicians to affirm the initial imple
$40.0K
1.0K services$38.66/svc2.27x markup
95885Needle measurement and recording of electrical activity of muscles of arm or leg limited studyโš  3.1x markup
$34.9K
799 services$43.70/svc3.11x markup
95913Nerve transmission studies, 13 or more studies
$29.5K
140 services$210.57/svc2.93x markup
99223Initial hospital inpatient care per day, typically 70 minutes
$19.3K
131 services$147.23/svc2.04x markup
99239Hospital discharge day management, more than 30 minutes
$14.8K
186 services$79.36/svc1.95x markup
99221Initial hospital inpatient care, typically 30 minutes per day
$14.7K
197 services$74.44/svc2.28x markup
74230Imaging for evaluation of swallowing functionโš  12.8x markup
$7.0K
348 services$20.13/svc12.81x markup
G0179Physician re-certification for medicare-covered home health services under a home health plan of care (patient not present), including contacts with home health agency and review of reports of patient status required by physicians to affirm the initial imโš  3.3x markup
$4.2K
145 services$28.71/svc3.28x markup
95908Nerve transmission studies, 3-4 studies
$1.6K
18 services$86.47/svc2.68x markup
Show detailed table โ–พ
CodeDescriptionServicesPaymentsAvg/ServiceMarkup
99231Subsequent hospital inpatient care, typically 15 minutes per day42.6K$1.3M$29.993.73x
99232Subsequent hospital inpatient care, typically 25 minutes per day18.1K$986.1K$54.572.29x
99222Initial hospital inpatient care, typically 50 minutes per day4.1K$411.0K$100.541.94x
95911Nerve transmission studies, 9-10 studies1.9K$300.8K$156.352.89x
99238Hospital discharge day management, 30 minutes or less4.4K$237.9K$54.392.21x
95886Needle measurement and recording of electrical activity of muscles of arm or leg complete study2.9K$205.2K$70.332.66x
95910Nerve transmission studies, 7-8 studies569$73.7K$129.612.88x
95909Nerve transmission studies, 5-6 studies741$72.1K$97.332.91x
95912Nerve transmission studies, 11-12 studies294$52.7K$179.363.47x
G0180Physician certification for medicare-covered home health services under a home health plan of care (patient not present), including contacts with home health agency and review of reports of patient status required by physicians to affirm the initial imple1.0K$40.0K$38.662.27x
95885Needle measurement and recording of electrical activity of muscles of arm or leg limited study799$34.9K$43.703.11x
95913Nerve transmission studies, 13 or more studies140$29.5K$210.572.93x
99223Initial hospital inpatient care per day, typically 70 minutes131$19.3K$147.232.04x
99239Hospital discharge day management, more than 30 minutes186$14.8K$79.361.95x
99221Initial hospital inpatient care, typically 30 minutes per day197$14.7K$74.442.28x
74230Imaging for evaluation of swallowing function348$7.0K$20.1312.81x
G0179Physician re-certification for medicare-covered home health services under a home health plan of care (patient not present), including contacts with home health agency and review of reports of patient status required by physicians to affirm the initial im145$4.2K$28.713.28x
95908Nerve transmission studies, 3-4 studies18$1.6K$86.472.68x

Markup Analysis

Charge-to-Payment Ratio

2.87x

This provider submits charges 2.87 times higher than what Medicare actually pays.

What This Means

A markup ratio of 2.87x means for every $100 Medicare pays, this provider initially charges $287. This is higher than the national average.

Location

Columbia, SC

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

  • 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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