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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.
Sister Sites: OpenMedicaid ยท OpenFeds ยท OpenSpending

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

Methodologyโ€ขDownload Data
  1. Home
  2. Providers
  3. Bess Chang
๐Ÿง 
DOIndividual

Bess Chang, D.O.

NPI: 1942228515
Las Vegas, NV
10 years of data
Neurology
$21.1M
Total Payments
135
Beneficiaries
619.5K
Services
3.93x
Markup Ratio

Peer Comparison

99th
percentile in specialty
This provider$21.1M
Specialty median$87.3K

๐Ÿ“‹ Key Findings

1Billed $21.1M over 10 years
23.93x markup ratio (above median)
399th percentile in Neurology by payments
4248 services/day โ€” physically implausible
5Payments surged 397% in 2021
68 procedures with >3x markup

โš ๏ธ This provider averages 248 services per working day โ€” physically unusual for an individual practitioner

Based on 619.5K total services over 10 years (250 working days/year). Learn about impossible service volumes โ†’

๐Ÿ”Ž Data Analysis

This provider's $21.1M in total Medicare payments ranks in the 99th percentile of Neurology providers nationally.

Averaging 248 services per working day raises questions about billing patterns.

Medicare payments to this provider grew 764% 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

๐Ÿ“ˆ

Notable: Payments increased 397% in 2021

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$475.84$147.643.22x$328.20$606.4K4.1K10
2015$408.68$145.162.82x$263.52$595.6K4.1K8
2016$121.67$42.342.87x$79.33$787.0K18.6K11
2017$103.92$36.052.88x$67.87$890.7K24.7K11
2018$60.09$20.132.99x$39.96$927.8K46.1K14
2019$47.50$17.662.69x$29.84$882.1K49.9K12
2020$46.55$18.092.57x$28.46$930.2K51.4K10
2021$160.60$33.214.84x$127.39$4.6M139.3K22
2022$154.86$38.224.05x$116.64$5.6M146.9K19
2023$162.51$38.994.17x$123.52$5.2M134.4K18

Top Procedures (20)

J1556Injection, immune globulin (bivigam), 500 mgโš  4.3x markup
$11.3M
201.7K services$56.07/svc4.33x markup
95913Nerve conduction, 13 or more studies
$2.2M
9.3K services$234.03/svc2.77x markup
95886Needle measurement of electrical activity in arm or leg muscles, complete study
$1.5M
19.2K services$76.03/svc2.55x markup
95819Measurement of brain wave activity (eeg), awake and asleep
$1.1M
3.3K services$342.64/svc2.52x markup
95957Measurement of brain wave activity (eeg), digital analysisโš  3.3x markup
$855.7K
3.7K services$234.25/svc3.31x markup
99215Established patient office or other outpatient visit, 40-54 minutes
$797.1K
6.7K services$119.81/svc2.50x markup
J1568Injection, immune globulin, (octagam), intravenous, non-lyophilized (e.g., liquid), 500 mgโš  9.5x markup
$795.6K
24.1K services$32.97/svc9.47x markup
J0585Injection, onabotulinumtoxina, 1 unitโš  3.3x markup
$762.2K
158.9K services$4.80/svc3.34x markup
J0588Injection, incobotulinumtoxin a, 1 unit
$623.5K
156.8K services$3.98/svc2.69x markup
99205New patient office or other outpatient visit, 60-74 minutes
$255.1K
1.6K services$157.40/svc2.76x markup
99214Established patient office or other outpatient visit, 30-39 minutes
$208.1K
2.5K services$81.73/svc2.82x markup
96365Infusion into a vein for therapy, prevention, or diagnosis, 1 hour or lessโš  6.4x markup
$174.6K
3.2K services$54.51/svc6.42x markup
95953Monitoring and localization of seizure activity over 24-hour period using portable 16-channel electroencephalograph (EEG)
$141.8K
412 services$344.26/svc2.69x markup
96366Infusion into a vein for therapy, prevention, or diagnosis, each additional hourโš  10.3x markup
$87.6K
5.2K services$17.02/svc10.29x markup
64615Injection of chemical for paralysis of facial and neck nerve muscles on both sides of face
$55.6K
459 services$121.15/svc2.50x markup
96375Injection of additional new drug or substance into veinโš  6.9x markup
$49.9K
3.9K services$12.92/svc6.86x markup
95912Nerve conduction, 11-12 studies
$49.6K
249 services$199.33/svc2.76x markup
64616Injection of chemical for paralysis of nerve muscles on side of neck excluding voice box
$43.6K
270 services$161.41/svc1.60x markup
99204New patient office or other outpatient visit, 45-59 minutesโš  3.2x markup
$31.5K
274 services$114.88/svc3.18x markup
95874Needle measurement of electrical activity in muscle with injection of chemical for paralysis of nerve muscle
$27.8K
446 services$62.35/svc2.44x markup
Show detailed table โ–พ
CodeDescriptionServicesPaymentsAvg/ServiceMarkup
J1556Injection, immune globulin (bivigam), 500 mg201.7K$11.3M$56.074.33x
95913Nerve conduction, 13 or more studies9.3K$2.2M$234.032.77x
95886Needle measurement of electrical activity in arm or leg muscles, complete study19.2K$1.5M$76.032.55x
95819Measurement of brain wave activity (eeg), awake and asleep3.3K$1.1M$342.642.52x
95957Measurement of brain wave activity (eeg), digital analysis3.7K$855.7K$234.253.31x
99215Established patient office or other outpatient visit, 40-54 minutes6.7K$797.1K$119.812.50x
J1568Injection, immune globulin, (octagam), intravenous, non-lyophilized (e.g., liquid), 500 mg24.1K$795.6K$32.979.47x
J0585Injection, onabotulinumtoxina, 1 unit158.9K$762.2K$4.803.34x
J0588Injection, incobotulinumtoxin a, 1 unit156.8K$623.5K$3.982.69x
99205New patient office or other outpatient visit, 60-74 minutes1.6K$255.1K$157.402.76x
99214Established patient office or other outpatient visit, 30-39 minutes2.5K$208.1K$81.732.82x
96365Infusion into a vein for therapy, prevention, or diagnosis, 1 hour or less3.2K$174.6K$54.516.42x
95953Monitoring and localization of seizure activity over 24-hour period using portable 16-channel electroencephalograph (EEG)412$141.8K$344.262.69x
96366Infusion into a vein for therapy, prevention, or diagnosis, each additional hour5.2K$87.6K$17.0210.29x
64615Injection of chemical for paralysis of facial and neck nerve muscles on both sides of face459$55.6K$121.152.50x
96375Injection of additional new drug or substance into vein3.9K$49.9K$12.926.86x
95912Nerve conduction, 11-12 studies249$49.6K$199.332.76x
64616Injection of chemical for paralysis of nerve muscles on side of neck excluding voice box270$43.6K$161.411.60x
99204New patient office or other outpatient visit, 45-59 minutes274$31.5K$114.883.18x
95874Needle measurement of electrical activity in muscle with injection of chemical for paralysis of nerve muscle446$27.8K$62.352.44x

Markup Analysis

Charge-to-Payment Ratio

3.93x

This provider submits charges 3.93 times higher than what Medicare actually pays.

What This Means

A markup ratio of 3.93x means for every $100 Medicare pays, this provider initially charges $393. This is higher than the national average.

Location

Las Vegas, NV

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.

Believe this data is inaccurate? Dispute this data