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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. Stephen Corday
❤️
MDIndividual

Stephen Corday, M.D.

NPI: 1194759803
Los Angeles, CA
10 years of data
Cardiology
$11.6M
Total Payments
167.3K
Beneficiaries
342.6K
Services
5.33x
Markup Ratio

Peer Comparison

99th
percentile in specialty
This provider$11.6M
Specialty median$193.1K

📋 Key Findings

1Billed $11.6M over 10 years
25.33x markup ratio (above median)
399th percentile in Cardiology by payments
4137 services/day — unusually high
515 procedures with >3x markup

This provider averages 137 services per working day

Based on 342.6K total services over 10 years (250 working days/year). Learn about impossible service volumes →

🔎 Data Analysis

This provider's $11.6M in total Medicare payments ranks in the 99th percentile of Cardiology providers nationally.

Their average markup ratio of 5.33x is significantly above the specialty median of 3.6x.

Averaging 137 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 — the gap represents the markup.

YearAvg SubmittedAvg PaidMarkup RatioGap per ServiceTotal PaymentsServicesBeneficiaries
2014$327.99$61.005.38x$266.99$1.5M42.6K19.6K
2015$329.01$60.185.47x$268.83$1.2M36.4K17.4K
2016$330.98$61.115.42x$269.87$1.1M35.6K16.9K
2017$326.32$61.665.29x$264.66$1.1M32.7K16.8K
2018$323.10$69.834.63x$253.27$953.3K29.3K15.3K
2019$313.20$63.754.91x$249.45$1.0M33.0K16.5K
2020$275.98$67.874.07x$208.11$915.5K28.2K15.1K
2021$271.37$62.794.32x$208.58$1.1M30.7K16.0K
2022$325.59$79.984.07x$245.61$1.4M37.1K16.8K
2023$329.13$80.824.07x$248.31$1.3M36.9K16.9K

Top Procedures (20)

78492Nuclear medicine study heart muscle at rest and/or stress multiple studies⚠ 3.5x markup
$2.0M
1.6K services$1.3K/svc3.46x markup
99214Established patient office or other outpatient, visit typically 25 minutes⚠ 3.4x markup
$1.2M
12.8K services$94.44/svc3.39x markup
93306Ultrasound examination of heart including color-depicted blood flow rate, direction, and valve function⚠ 5.3x markup
$768.9K
4.4K services$176.72/svc5.28x markup
99213Established patient office or other outpatient visit, typically 15 minutes⚠ 3.0x markup
$647.7K
10.4K services$62.51/svc3.01x markup
83880Natriuretic peptide (heart and blood vessel protein) level⚠ 6.6x markup
$546.3K
13.0K services$42.12/svc6.59x markup
A9555Rubidium rb-82, diagnostic, per study dose, up to 60 millicuries
$510.6K
1.6K services$319.92/svc2.08x markup
99215Established patient office or other outpatient, visit typically 40 minutes
$418.0K
3.1K services$135.42/svc2.64x markup
93880Ultrasound scanning of blood flow (outside the brain) on both sides of head and neck⚠ 6.0x markup
$330.8K
2.0K services$166.40/svc5.95x markup
99442Physician telephone patient service, 11-20 minutes of medical discussion
$288.3K
5.2K services$55.17/svc2.23x markup
93229Heart rhythm tracing, computer analysis, physician prescribed transmission of patient-triggered events greater than 24-hour ekg up to 30 days
$248.3K
300 services$827.54/svc2.36x markup
84443Blood test, thyroid stimulating hormone (TSH)⚠ 7.3x markup
$234.3K
12.1K services$19.41/svc7.32x markup
93000Routine EKG using at least 12 leads including interpretation and report⚠ 12.5x markup
$230.8K
17.9K services$12.91/svc12.48x markup
80053Blood test, comprehensive group of blood chemicals⚠ 9.5x markup
$223.0K
19.7K services$11.34/svc9.46x markup
86141Measurement C-reactive protein for detection of infection or inflammation⚠ 6.2x markup
$205.5K
13.8K services$14.89/svc6.19x markup
85025Complete blood cell count (red cells, white blood cell, platelets), automated test⚠ 7.4x markup
$196.8K
21.6K services$9.11/svc7.38x markup
99223Initial hospital inpatient care, typically 70 minutes per day⚠ 4.3x markup
$147.3K
861 services$171.12/svc4.26x markup
84153PSA (prostate specific antigen) measurement⚠ 6.8x markup
$135.9K
6.4K services$21.38/svc6.81x markup
83721LDL cholesterol level⚠ 5.8x markup
$126.4K
11.1K services$11.43/svc5.85x markup
84439Thyroxine (thyroid chemical) measurement⚠ 10.7x markup
$125.9K
12.1K services$10.41/svc10.73x markup
82306Vitamin D-3 level
$116.3K
3.9K services$30.16/svc2.32x markup
Show detailed table ▾
CodeDescriptionServicesPaymentsAvg/ServiceMarkup
78492Nuclear medicine study heart muscle at rest and/or stress multiple studies1.6K$2.0M$1.3K3.46x
99214Established patient office or other outpatient, visit typically 25 minutes12.8K$1.2M$94.443.39x
93306Ultrasound examination of heart including color-depicted blood flow rate, direction, and valve function4.4K$768.9K$176.725.28x
99213Established patient office or other outpatient visit, typically 15 minutes10.4K$647.7K$62.513.01x
83880Natriuretic peptide (heart and blood vessel protein) level13.0K$546.3K$42.126.59x
A9555Rubidium rb-82, diagnostic, per study dose, up to 60 millicuries1.6K$510.6K$319.922.08x
99215Established patient office or other outpatient, visit typically 40 minutes3.1K$418.0K$135.422.64x
93880Ultrasound scanning of blood flow (outside the brain) on both sides of head and neck2.0K$330.8K$166.405.95x
99442Physician telephone patient service, 11-20 minutes of medical discussion5.2K$288.3K$55.172.23x
93229Heart rhythm tracing, computer analysis, physician prescribed transmission of patient-triggered events greater than 24-hour ekg up to 30 days300$248.3K$827.542.36x
84443Blood test, thyroid stimulating hormone (TSH)12.1K$234.3K$19.417.32x
93000Routine EKG using at least 12 leads including interpretation and report17.9K$230.8K$12.9112.48x
80053Blood test, comprehensive group of blood chemicals19.7K$223.0K$11.349.46x
86141Measurement C-reactive protein for detection of infection or inflammation13.8K$205.5K$14.896.19x
85025Complete blood cell count (red cells, white blood cell, platelets), automated test21.6K$196.8K$9.117.38x
99223Initial hospital inpatient care, typically 70 minutes per day861$147.3K$171.124.26x
84153PSA (prostate specific antigen) measurement6.4K$135.9K$21.386.81x
83721LDL cholesterol level11.1K$126.4K$11.435.85x
84439Thyroxine (thyroid chemical) measurement12.1K$125.9K$10.4110.73x
82306Vitamin D-3 level3.9K$116.3K$30.162.32x

Markup Analysis

Charge-to-Payment Ratio

5.33x

This provider submits charges 5.33 times higher than what Medicare actually pays.

What This Means

A markup ratio of 5.33x means for every $100 Medicare pays, this provider initially charges $533. This is higher than the national average.

Location

Los Angeles, 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 Cardiology providers in CA for peer comparison.

Stephen Corday (you)
$11.6M
Leo Polosajian, M.D.
$52.5M
Athar Ansari, M.D.
$38.2M
Hanumandla Reddy, M.D
$38.1M
Mehran Khorsandi, M.D.,
$36.4M
Shashi Sharma, D.M.
$35.4M
Show detailed table ▾
ProviderLocationTotal PaymentsStatus
Leo Polosajian, M.D.Reseda, CA$52.5M✓ Clear
Athar Ansari, M.D.El Centro, CA$38.2M✓ Clear
Hanumandla Reddy, M.DHanford, CA$38.1M✓ Clear
Mehran Khorsandi, M.D.,Los Angeles, CA$36.4M✓ Clear
Shashi Sharma, D.M.Visalia, CA$35.4M✓ Clear

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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.

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