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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. Swee Lian Tan
๐Ÿ”ช
MDIndividual

Swee Lian Tan, M.D.

NPI: 1568430908
Seattle, WA
10 years of data
Vascular Surgery
$9.6M
Total Payments
14.6K
Beneficiaries
22.4K
Services
4.19x
Markup Ratio

Peer Comparison

99th
percentile in specialty
This provider$9.6M
Specialty median$184.1K

๐Ÿ“‹ Key Findings

1Billed $9.6M over 10 years
24.19x markup ratio (above median)
399th percentile in Vascular Surgery by payments
4Payments surged 286% in 2020
520 procedures with >3x markup
โœ“ No flags detected

๐Ÿ”Ž Data Analysis

This provider's $9.6M in total Medicare payments ranks in the 99th percentile of Vascular Surgery providers nationally.

Medicare payments to this provider grew 478% 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 286% in 2020

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$821.39$183.234.48x$638.16$229.9K1.9K1.2K
2015$1.0K$205.284.93x$806.58$276.3K2.3K1.5K
2016$938.82$202.854.63x$735.97$294.1K2.5K1.8K
2017$886.54$208.744.25x$677.80$233.1K1.9K1.4K
2018$1.0K$272.443.69x$733.73$341.6K2.3K1.6K
2019$3.5K$856.174.05x$2.6K$647.6K2.2K1.4K
2020$6.0K$1.4K4.27x$4.6K$2.5M2.7K1.7K
2021$6.0K$1.5K3.98x$4.5K$1.9M2.4K1.5K
2022$5.7K$1.4K4.12x$4.3K$1.8M2.3K1.3K
2023$3.7K$867.594.32x$2.9K$1.3M2.0K1.1K

Top Procedures (20)

37225Removal of plaque in arteries in one leg, endovascular, accessed through the skin or open procedureโš  4.5x markup
$3.2M
466 services$6.8K/svc4.49x markup
37229Removal of plaque in artery in one leg, endovascular, accessed through the skin or open procedureโš  3.9x markup
$2.6M
299 services$8.6K/svc3.85x markup
37227Removal of plaque and insertion of stents into arteries in one leg, endovascular, accessed through the skin or open procedureโš  3.7x markup
$614.4K
54 services$11.4K/svc3.68x markup
99213Established patient office or other outpatient visit, typically 15 minutesโš  3.8x markup
$411.6K
6.7K services$61.69/svc3.82x markup
36902Insertion of needle and/or catheter into dialysis circuit and balloon dilation of dialysis segment, with imaging including radiological supervision and interpretationโš  3.8x markup
$306.9K
348 services$881.87/svc3.78x markup
37252Ultrasound evaluation of blood vessel during diagnosis or treatmentโš  3.8x markup
$223.5K
238 services$938.92/svc3.75x markup
37221Insertion of stents in artery in one side of groin, endovascular, accessed through the skin or open procedureโš  4.5x markup
$208.6K
205 services$1.0K/svc4.46x markup
99204New patient office or other outpatient visit, typically 45 minutesโš  4.1x markup
$149.9K
1.2K services$127.76/svc4.14x markup
37220Balloon dilation of artery in one side of groin, endovascular, accessed through the skin or open procedureโš  6.0x markup
$148.8K
163 services$912.82/svc5.95x markup
93925Ultrasound study of arteries and arterial grafts of both legsโš  3.8x markup
$130.7K
637 services$205.25/svc3.80x markup
75710Radiological supervision and interpretation of imaging of artery of one arm or legโš  3.8x markup
$114.2K
1.1K services$99.76/svc3.75x markup
93880Ultrasound scanning of blood flow (outside the brain) on both sides of head and neckโš  4.3x markup
$113.7K
714 services$159.18/svc4.29x markup
37224Balloon dilation of arteries in one leg, endovascular, accessed through the skin or open procedureโš  4.9x markup
$99.8K
247 services$404.04/svc4.91x markup
99214Established patient office or other outpatient, visit typically 25 minutesโš  3.7x markup
$93.7K
1.0K services$92.90/svc3.72x markup
35301Removal of blood clot and portion of artery of neckโš  3.9x markup
$88.6K
96 services$922.47/svc3.86x markup
93923Ultrasound study of arteries of both arms and legsโš  4.9x markup
$86.8K
895 services$96.99/svc4.91x markup
37228Balloon dilation of artery of one leg, endovascular, accessed through the skin or open procedureโš  4.9x markup
$84.8K
136 services$623.88/svc4.91x markup
93990Ultrasound of dialysis accessโš  4.5x markup
$84.6K
698 services$121.27/svc4.45x markup
93926Ultrasound study of arteries and arterial grafts of one leg or limitedโš  4.6x markup
$80.0K
710 services$112.71/svc4.59x markup
35476Balloon dilation of narrowed or blocked vein, accessed through the skinโš  6.8x markup
$73.7K
203 services$363.13/svc6.81x markup
Show detailed table โ–พ
CodeDescriptionServicesPaymentsAvg/ServiceMarkup
37225Removal of plaque in arteries in one leg, endovascular, accessed through the skin or open procedure466$3.2M$6.8K4.49x
37229Removal of plaque in artery in one leg, endovascular, accessed through the skin or open procedure299$2.6M$8.6K3.85x
37227Removal of plaque and insertion of stents into arteries in one leg, endovascular, accessed through the skin or open procedure54$614.4K$11.4K3.68x
99213Established patient office or other outpatient visit, typically 15 minutes6.7K$411.6K$61.693.82x
36902Insertion of needle and/or catheter into dialysis circuit and balloon dilation of dialysis segment, with imaging including radiological supervision and interpretation348$306.9K$881.873.78x
37252Ultrasound evaluation of blood vessel during diagnosis or treatment238$223.5K$938.923.75x
37221Insertion of stents in artery in one side of groin, endovascular, accessed through the skin or open procedure205$208.6K$1.0K4.46x
99204New patient office or other outpatient visit, typically 45 minutes1.2K$149.9K$127.764.14x
37220Balloon dilation of artery in one side of groin, endovascular, accessed through the skin or open procedure163$148.8K$912.825.95x
93925Ultrasound study of arteries and arterial grafts of both legs637$130.7K$205.253.80x
75710Radiological supervision and interpretation of imaging of artery of one arm or leg1.1K$114.2K$99.763.75x
93880Ultrasound scanning of blood flow (outside the brain) on both sides of head and neck714$113.7K$159.184.29x
37224Balloon dilation of arteries in one leg, endovascular, accessed through the skin or open procedure247$99.8K$404.044.91x
99214Established patient office or other outpatient, visit typically 25 minutes1.0K$93.7K$92.903.72x
35301Removal of blood clot and portion of artery of neck96$88.6K$922.473.86x
93923Ultrasound study of arteries of both arms and legs895$86.8K$96.994.91x
37228Balloon dilation of artery of one leg, endovascular, accessed through the skin or open procedure136$84.8K$623.884.91x
93990Ultrasound of dialysis access698$84.6K$121.274.45x
93926Ultrasound study of arteries and arterial grafts of one leg or limited710$80.0K$112.714.59x
35476Balloon dilation of narrowed or blocked vein, accessed through the skin203$73.7K$363.136.81x

Markup Analysis

Charge-to-Payment Ratio

4.19x

This provider submits charges 4.19 times higher than what Medicare actually pays.

What This Means

A markup ratio of 4.19x means for every $100 Medicare pays, this provider initially charges $419. This is higher than the national average.

Location

Seattle, WA

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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