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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. Michael Dao
๐Ÿฉบ
MDIndividual

Michael Dao, M.D.

NPI: 1437321932
Garden Grove, CA
10 years of data
Internal Medicine
$7.7M
Total Payments
55.6K
Beneficiaries
137.1K
Services
1.84x
Markup Ratio

Peer Comparison

99th
percentile in specialty
This provider$7.7M
Specialty median$84.0K

๐Ÿ“‹ Key Findings

1Billed $7.7M over 10 years
21.84x markup ratio
399th percentile in Internal Medicine by payments
455 services/day โ€” unusually high
5Payments surged 129% in 2016
61 procedure with >3x markup

This provider averages 55 services per working day

Based on 137.1K total services over 10 years (250 working days/year). Learn about impossible service volumes โ†’

๐Ÿ”Ž Data Analysis

This provider's $7.7M in total Medicare payments ranks in the 99th percentile of Internal Medicine providers nationally.

Averaging 55 services per working day raises questions about billing patterns.

Medicare payments to this provider grew 302% 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 129% in 2016

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$164.54$72.742.26x$91.80$324.6K5.9K3.6K
2015$77.65$37.632.06x$40.02$282.0K6.0K3.3K
2016$88.24$41.432.13x$46.81$645.7K14.6K5.9K
2017$97.85$41.692.35x$56.16$814.0K18.4K6.9K
2018$97.39$42.032.32x$55.36$868.3K20.1K7.4K
2019$118.25$59.691.98x$58.56$799.3K16.8K5.8K
2020$131.44$63.792.06x$67.65$711.9K16.3K5.9K
2021$226.89$124.901.82x$101.99$691.9K9.8K5.3K
2022$241.20$123.711.95x$117.49$1.2M15.4K6.3K
2023$238.38$112.552.12x$125.83$1.3M13.9K5.2K

Top Procedures (20)

99213Established patient office or other outpatient visit, typically 15 minutes
$2.2M
38.5K services$58.03/svc1.67x markup
99490Chronic care management services at least 20 minutes per calendar month
$1.8M
49.0K services$35.78/svc1.50x markup
36475Destruction of insufficient vein of arm or leg, accessed through the skin
$703.4K
672 services$1.0K/svc2.39x markup
36465Injection of chemical agent into single incompetent vein of leg using ultrasound guidance
$463.7K
358 services$1.3K/svc1.55x markup
J7324Hyaluronan or derivative, orthovisc, for intra-articular injection, per doseโš  3.4x markup
$363.3K
3.0K services$122.11/svc3.35x markup
99214Established patient office or other outpatient, visit typically 25 minutes
$320.6K
3.8K services$83.57/svc1.88x markup
90662Vaccine for influenza for injection into muscle
$294.2K
5.5K services$53.39/svc1.22x markup
20610Aspiration and/or injection of large joint or joint capsule
$168.4K
3.7K services$45.82/svc2.84x markup
99496Transitional care management services, highly complexity, requiring face-to-face visits within 7 days of discharge
$159.1K
745 services$213.61/svc1.75x markup
G0008Administration of influenza virus vaccine
$152.4K
5.9K services$26.01/svc1.92x markup
90670Pneumococcal vaccine for injection into muscle
$140.8K
712 services$197.73/svc1.29x markup
96372Injection beneath the skin or into muscle for therapy, diagnosis, or prevention
$89.5K
5.7K services$15.66/svc2.55x markup
99203New patient office or other outpatient visit, typically 30 minutes
$57.3K
812 services$70.60/svc2.90x markup
G0438Annual wellness visit; includes a personalized prevention plan of service (pps), initial visit
$48.4K
256 services$189.20/svc1.59x markup
99495Transitional care management services, moderately complexity, requiring face-to-face visits within 14 days of discharge
$47.6K
307 services$155.14/svc2.08x markup
93970Ultrasound scan of veins of both arms or legs including assessment of compression and functional maneuvers
$47.1K
275 services$171.42/svc1.47x markup
36471Injection of chemical agent into multiple incompetent veins of leg
$46.4K
263 services$176.27/svc1.70x markup
99442Physician telephone patient service, 11-20 minutes of medical discussion
$44.3K
744 services$59.50/svc1.63x markup
90732Vaccine for pneumococcal polysaccharide for injection beneath the skin or into muscle, patient 2 years or older
$34.1K
331 services$102.88/svc1.31x markup
99212Established patient office or other outpatient visit, typically 10 minutes
$27.4K
788 services$34.75/svc2.03x markup
Show detailed table โ–พ
CodeDescriptionServicesPaymentsAvg/ServiceMarkup
99213Established patient office or other outpatient visit, typically 15 minutes38.5K$2.2M$58.031.67x
99490Chronic care management services at least 20 minutes per calendar month49.0K$1.8M$35.781.50x
36475Destruction of insufficient vein of arm or leg, accessed through the skin672$703.4K$1.0K2.39x
36465Injection of chemical agent into single incompetent vein of leg using ultrasound guidance358$463.7K$1.3K1.55x
J7324Hyaluronan or derivative, orthovisc, for intra-articular injection, per dose3.0K$363.3K$122.113.35x
99214Established patient office or other outpatient, visit typically 25 minutes3.8K$320.6K$83.571.88x
90662Vaccine for influenza for injection into muscle5.5K$294.2K$53.391.22x
20610Aspiration and/or injection of large joint or joint capsule3.7K$168.4K$45.822.84x
99496Transitional care management services, highly complexity, requiring face-to-face visits within 7 days of discharge745$159.1K$213.611.75x
G0008Administration of influenza virus vaccine5.9K$152.4K$26.011.92x
90670Pneumococcal vaccine for injection into muscle712$140.8K$197.731.29x
96372Injection beneath the skin or into muscle for therapy, diagnosis, or prevention5.7K$89.5K$15.662.55x
99203New patient office or other outpatient visit, typically 30 minutes812$57.3K$70.602.90x
G0438Annual wellness visit; includes a personalized prevention plan of service (pps), initial visit256$48.4K$189.201.59x
99495Transitional care management services, moderately complexity, requiring face-to-face visits within 14 days of discharge307$47.6K$155.142.08x
93970Ultrasound scan of veins of both arms or legs including assessment of compression and functional maneuvers275$47.1K$171.421.47x
36471Injection of chemical agent into multiple incompetent veins of leg263$46.4K$176.271.70x
99442Physician telephone patient service, 11-20 minutes of medical discussion744$44.3K$59.501.63x
90732Vaccine for pneumococcal polysaccharide for injection beneath the skin or into muscle, patient 2 years or older331$34.1K$102.881.31x
99212Established patient office or other outpatient visit, typically 10 minutes788$27.4K$34.752.03x

Markup Analysis

Charge-to-Payment Ratio

1.84x

This provider submits charges 1.84 times higher than what Medicare actually pays.

What This Means

A markup ratio of 1.84x means for every $100 Medicare pays, this provider initially charges $184. This is lower than the national average.

Location

Garden Grove, 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 Internal Medicine providers in CA for peer comparison.

Michael Dao (you)
$7.7M
Aaron Jeng, MD, MPH
$45.6M
Richard Park, M.D.โš ๏ธ
$34.7M
Show detailed table โ–พ
ProviderLocationTotal PaymentsStatus
Aaron Jeng, MD, MPHSan Gabriel, CA$45.6Mโœ“ Clear
Richard Park, M.D.Granada Hills, CA$34.7Mโš ๏ธ Flagged

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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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