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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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ยฉ 2026 OpenMedicare. Independent data journalism. Built by TheDataProject.ai

Methodologyโ€ขDownload Data
  1. Home
  2. Providers
  3. Ghassan Zalzaleh
๐Ÿฉบ
MDIndividual

Ghassan Zalzaleh, MD

NPI: 1992704035
Oak Lawn, IL
10 years of data
Internal Medicine
$16.6M
Total Payments
346
Beneficiaries
1.3M
Services
4.71x
Markup Ratio

Peer Comparison

99th
percentile in specialty
This provider$16.6M
Specialty median$84.0K

๐Ÿ“‹ Key Findings

1Billed $16.6M over 10 years
24.71x markup ratio (above median)
3Risk score: 75 โ€” flagged for review
499th percentile in Internal Medicine by payments
5537 services/day โ€” physically implausible
6Payments surged 85% in 2019

โš ๏ธ Flagged for Review

Risk Score: 75
  • 69x specialty median spending
  • Markup 31.1x (specialty median: 3.3x)
  • 8x specialty median beneficiaries
  • 356x specialty median services
View Deep Dives โ†’Report Fraud โ†’

Statistical flag only โ€” not an accusation of fraud

โš ๏ธ This provider averages 537 services per working day โ€” physically unusual for an individual practitioner

Based on 1.3M total services over 10 years (250 working days/year). Learn about impossible service volumes โ†’

๐Ÿ”Ž Data Analysis

This provider's $16.6M in total Medicare payments ranks in the 99th percentile of Internal Medicine providers nationally.

Averaging 537 services per working day raises questions about billing patterns.

Medicare payments to this provider grew 317% from 2014 to 2023.

This provider has been statistically flagged with a risk score of 75/100. 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

๐Ÿ“ˆ

Notable: Payments increased 85% in 2019

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 โ€” the gap represents the markup.

YearAvg SubmittedAvg PaidMarkup RatioGap per ServiceTotal PaymentsServicesBeneficiaries
2014$64.97$12.955.02x$52.02$739.8K57.1K24
2015$65.09$13.754.73x$51.34$549.2K39.9K27
2016$49.92$11.514.34x$38.41$966.6K83.9K28
2017$56.38$11.654.84x$44.73$1.0M88.4K37
2018$45.22$9.654.69x$35.57$1.0M106.8K33
2019$65.20$13.924.68x$51.28$1.9M137.1K36
2020$53.89$11.184.82x$42.71$1.8M159.9K38
2021$58.22$13.864.20x$44.36$2.8M201.3K41
2022$54.64$10.805.06x$43.84$2.8M255.7K45
2023$69.82$14.514.81x$55.31$3.1M212.6K37

Top Procedures (20)

J9271Injection, pembrolizumab, 1 mgโš  3.4x markup
$5.4M
129.9K services$41.55/svc3.41x markup
J2505Injection, pegfilgrastim, 6 mgโš  4.5x markup
$2.0M
672 services$3.0K/svc4.45x markup
J9299Injection, nivolumab, 1 mgโš  3.6x markup
$1.5M
68.7K services$21.80/svc3.64x markup
99214Established patient office or other outpatient visit, 30-39 minutesโš  4.6x markup
$890.7K
10.2K services$87.19/svc4.59x markup
J0897Injection, denosumab, 1 mgโš  3.8x markup
$781.1K
51.0K services$15.32/svc3.76x markup
J0881Injection, darbepoetin alfa, 1 microgram (non-esrd use)โš  7.0x markup
$724.3K
247.6K services$2.93/svc6.99x markup
78815Nuclear medicine study from skull base to mid-thigh with ct scanโš  3.5x markup
$660.2K
516 services$1.3K/svc3.47x markup
96413Administration of chemotherapy into vein, 1 hour or lessโš  5.6x markup
$545.3K
4.8K services$114.57/svc5.59x markup
J9035Injection, bevacizumab, 10 mgโš  4.0x markup
$277.7K
4.8K services$57.81/svc3.98x markup
J9041Injection, bortezomib, 0.1 mgโš  4.4x markup
$265.8K
9.1K services$29.21/svc4.38x markup
J9022Injection, atezolizumab, 10 mgโš  3.6x markup
$261.5K
4.1K services$64.10/svc3.58x markup
G9678Oncology care model (ocm) monthly enhanced oncology services (meos) payment for ocm enhanced services. g9678 payments may only be made to ocm practitioners for ocm beneficiaries for the furnishment of enhanced services as defined in the ocm participation a
$254.8K
1.6K services$157.67/svc1.01x markup
Q5119Injection, rituximab-pvvr, biosimilar, (ruxience), 10 mgโš  5.3x markup
$233.2K
6.3K services$36.84/svc5.27x markup
J1439Injection, ferric carboxymaltose, 1 mgโš  5.8x markup
$180.6K
207.8K services$0.87/svc5.75x markup
J2469Injection, palonosetron hcl, 25 mcgโš  10.7x markup
$163.0K
17.4K services$9.39/svc10.70x markup
99232Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutesโš  4.4x markup
$148.8K
2.4K services$61.00/svc4.43x markup
Q5120Injection, pegfilgrastim-bmez, biosimilar, (ziextenzo), 0.5 mgโš  5.3x markup
$140.1K
840 services$166.80/svc5.29x markup
99215Established patient office or other outpatient visit, 40-54 minutesโš  4.2x markup
$137.0K
1.1K services$126.52/svc4.19x markup
J9312Injection, rituximab, 10 mgโš  3.4x markup
$135.5K
1.8K services$74.46/svc3.41x markup
A9552Fluorodeoxyglucose f-18 fdg, diagnostic, per study dose, up to 45 millicuries
$125.9K
482 services$261.20/svc1.90x markup
Show detailed table โ–พ
CodeDescriptionServicesPaymentsAvg/ServiceMarkup
J9271Injection, pembrolizumab, 1 mg129.9K$5.4M$41.553.41x
J2505Injection, pegfilgrastim, 6 mg672$2.0M$3.0K4.45x
J9299Injection, nivolumab, 1 mg68.7K$1.5M$21.803.64x
99214Established patient office or other outpatient visit, 30-39 minutes10.2K$890.7K$87.194.59x
J0897Injection, denosumab, 1 mg51.0K$781.1K$15.323.76x
J0881Injection, darbepoetin alfa, 1 microgram (non-esrd use)247.6K$724.3K$2.936.99x
78815Nuclear medicine study from skull base to mid-thigh with ct scan516$660.2K$1.3K3.47x
96413Administration of chemotherapy into vein, 1 hour or less4.8K$545.3K$114.575.59x
J9035Injection, bevacizumab, 10 mg4.8K$277.7K$57.813.98x
J9041Injection, bortezomib, 0.1 mg9.1K$265.8K$29.214.38x
J9022Injection, atezolizumab, 10 mg4.1K$261.5K$64.103.58x
G9678Oncology care model (ocm) monthly enhanced oncology services (meos) payment for ocm enhanced services. g9678 payments may only be made to ocm practitioners for ocm beneficiaries for the furnishment of enhanced services as defined in the ocm participation a1.6K$254.8K$157.671.01x
Q5119Injection, rituximab-pvvr, biosimilar, (ruxience), 10 mg6.3K$233.2K$36.845.27x
J1439Injection, ferric carboxymaltose, 1 mg207.8K$180.6K$0.875.75x
J2469Injection, palonosetron hcl, 25 mcg17.4K$163.0K$9.3910.70x
99232Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes2.4K$148.8K$61.004.43x
Q5120Injection, pegfilgrastim-bmez, biosimilar, (ziextenzo), 0.5 mg840$140.1K$166.805.29x
99215Established patient office or other outpatient visit, 40-54 minutes1.1K$137.0K$126.524.19x
J9312Injection, rituximab, 10 mg1.8K$135.5K$74.463.41x
A9552Fluorodeoxyglucose f-18 fdg, diagnostic, per study dose, up to 45 millicuries482$125.9K$261.201.90x

Markup Analysis

Charge-to-Payment Ratio

4.71x

This provider submits charges 4.71 times higher than what Medicare actually pays.

What This Means

A markup ratio of 4.71x means for every $100 Medicare pays, this provider initially charges $471. This is higher than the national average.

Location

Oak Lawn, IL

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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