OpenMedicare
Start Here
Explore
Fraud
Investigations
Data
Tools
About

Footer

OpenMedicare

Independent Medicare data journalism

Sister Sites

  • OpenMedicaid
  • OpenFeds
  • OpenSpending

Explore

  • Providers
  • Procedures
  • States
  • Specialties
  • Search

Fraud Analysis

  • Still Out There (AI)
  • Fraud Overview
  • Fraud Watchlist
  • Deep Dive Profiles
  • Impossible Numbers
  • Report Fraud

Investigations

  • The Algorithm Knows
  • How We Built the Model
  • Internal Medicine Crisis
  • Florida & California Fraud
  • Million Dollar Flagged
  • All Investigations

Tools

  • Provider Lookup
  • Compare
  • Cost Calculator
  • Your Medicare Dollar
  • Downloads

About

  • About OpenMedicare
  • Methodology
  • Glossary
  • Data Sources
  • API Docs
  • Updates
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. Karl Weingarten
๐Ÿ“ก
MDIndividual

Karl Weingarten, MD

NPI: 1134172547
Garden Grove, CA
10 years of data
Interventional Radiology
$15.9M
Total Payments
26.2K
Beneficiaries
33.9K
Services
5.16x
Markup Ratio

Peer Comparison

99th
percentile in specialty
This provider$15.9M
Specialty median$146.5K

๐Ÿ“‹ Key Findings

1Billed $15.9M over 10 years
25.16x markup ratio (above median)
399th percentile in Interventional Radiology by payments
4Payments surged 237% in 2022
520 procedures with >3x markup
โœ“ No flags detected

๐Ÿ”Ž Data Analysis

This provider's $15.9M in total Medicare payments ranks in the 99th percentile of Interventional Radiology providers nationally.

Their average markup ratio of 5.16x is significantly above the specialty median of 5.1x.

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 237% in 2022

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$2.4K$385.006.28x$2.0K$1.4M3.2K2.5K
2015$2.3K$384.866.09x$2.0K$1.2M2.8K2.3K
2016$2.5K$441.785.67x$2.1K$1.4M3.2K2.5K
2017$3.6K$655.485.42x$2.9K$1.6M3.4K2.7K
2018$3.5K$659.125.34x$2.9K$1.5M3.4K2.8K
2019$3.4K$621.395.44x$2.8K$1.9M4.2K3.4K
2020$3.2K$601.195.34x$2.6K$1.5M3.5K2.9K
2021$2.5K$460.025.35x$2.0K$780.2K1.9K1.6K
2022$3.1K$914.863.38x$2.2K$2.6M4.8K2.9K
2023$2.0K$594.513.39x$1.4K$1.8M3.5K2.6K

Top Procedures (20)

36903Insertion of needle and/or catheter into dialysis circuit and insertion of stent in dialysis segment, with imaging including radiological supervision and interpretationโš  4.4x markup
$3.1M
778 services$4.0K/svc4.43x markup
37252Ultrasound evaluation of blood vessel during diagnosis or treatmentโš  4.2x markup
$2.1M
2.3K services$901.14/svc4.21x markup
37238Insertion of intravascular stents in vein, open or accessed through the skin, with radiological supervision and interpretationโš  5.2x markup
$1.6M
569 services$2.9K/svc5.20x markup
36215Insertion of catheter into chest or arm arteryโš  7.7x markup
$1.6M
3.3K services$486.04/svc7.71x markup
36902Insertion of needle and/or catheter into dialysis circuit and balloon dilation of dialysis segment, with imaging including radiological supervision and interpretationโš  4.6x markup
$1.3M
1.4K services$951.60/svc4.58x markup
36906Excision of blood clot and/or infusion to dissolve blood clot and balloon dilation of dialysis segment, accessed through the skin, with imaging including radiological supervision and interpretationโš  4.2x markup
$1.1M
214 services$5.0K/svc4.19x markup
35476Balloon dilation of narrowed or blocked vein, accessed through the skinโš  6.3x markup
$576.2K
690 services$835.11/svc6.28x markup
36147Insertion of needle and/or catheter for dialysisโš  9.1x markup
$459.3K
1.4K services$339.72/svc9.05x markup
36907Balloon dilation of dialysis segment, accessed through the skin, with imaging including radiological supervision and interpretationโš  4.5x markup
$433.2K
814 services$532.13/svc4.46x markup
36909Permanent blockage of dialysis circuit, with imaging including radiological supervision and interpretationโš  3.9x markup
$433.0K
257 services$1.7K/svc3.88x markup
75710Radiological supervision and interpretation of imaging of artery of one arm or legโš  4.5x markup
$408.6K
3.3K services$125.31/svc4.54x markup
37253Ultrasound evaluation of blood vessel during diagnosis or treatmentโš  4.2x markup
$348.3K
2.3K services$148.96/svc4.18x markup
37241Occlusion of venous malformations (other than hemorrhage) with radiological supervision and interpretation, roadmapping, and imaging guidanceโš  5.2x markup
$346.6K
107 services$3.2K/svc5.21x markup
36908Insertion of stent in dialysis segment, with imaging including radiological supervision and interpretationโš  4.4x markup
$201.3K
128 services$1.6K/svc4.43x markup
36870Catheter removal of blood clot from dialysis graft, accessed through the skinโš  6.6x markup
$182.6K
180 services$1.0K/svc6.60x markup
36561Insertion of central venous catheter and implanted device for infusion beneath the skin, patient 5 years or olderโš  5.1x markup
$164.2K
204 services$804.72/svc5.06x markup
36901Insertion of needle and/or catheter into dialysis circuit, with imaging including radiological supervision and interpretationโš  8.1x markup
$155.2K
555 services$279.68/svc8.10x markup
36558Insertion of central venous catheter for infusion, patient 5 years or olderโš  5.5x markup
$150.9K
307 services$491.59/svc5.50x markup
36581Replacement of central venous catheterโš  5.8x markup
$119.2K
257 services$463.69/svc5.79x markup
35475Balloon dilation of narrowed or blocked upper arm artery, accessed through the skinโš  5.9x markup
$103.0K
105 services$980.57/svc5.91x markup
Show detailed table โ–พ
CodeDescriptionServicesPaymentsAvg/ServiceMarkup
36903Insertion of needle and/or catheter into dialysis circuit and insertion of stent in dialysis segment, with imaging including radiological supervision and interpretation778$3.1M$4.0K4.43x
37252Ultrasound evaluation of blood vessel during diagnosis or treatment2.3K$2.1M$901.144.21x
37238Insertion of intravascular stents in vein, open or accessed through the skin, with radiological supervision and interpretation569$1.6M$2.9K5.20x
36215Insertion of catheter into chest or arm artery3.3K$1.6M$486.047.71x
36902Insertion of needle and/or catheter into dialysis circuit and balloon dilation of dialysis segment, with imaging including radiological supervision and interpretation1.4K$1.3M$951.604.58x
36906Excision of blood clot and/or infusion to dissolve blood clot and balloon dilation of dialysis segment, accessed through the skin, with imaging including radiological supervision and interpretation214$1.1M$5.0K4.19x
35476Balloon dilation of narrowed or blocked vein, accessed through the skin690$576.2K$835.116.28x
36147Insertion of needle and/or catheter for dialysis1.4K$459.3K$339.729.05x
36907Balloon dilation of dialysis segment, accessed through the skin, with imaging including radiological supervision and interpretation814$433.2K$532.134.46x
36909Permanent blockage of dialysis circuit, with imaging including radiological supervision and interpretation257$433.0K$1.7K3.88x
75710Radiological supervision and interpretation of imaging of artery of one arm or leg3.3K$408.6K$125.314.54x
37253Ultrasound evaluation of blood vessel during diagnosis or treatment2.3K$348.3K$148.964.18x
37241Occlusion of venous malformations (other than hemorrhage) with radiological supervision and interpretation, roadmapping, and imaging guidance107$346.6K$3.2K5.21x
36908Insertion of stent in dialysis segment, with imaging including radiological supervision and interpretation128$201.3K$1.6K4.43x
36870Catheter removal of blood clot from dialysis graft, accessed through the skin180$182.6K$1.0K6.60x
36561Insertion of central venous catheter and implanted device for infusion beneath the skin, patient 5 years or older204$164.2K$804.725.06x
36901Insertion of needle and/or catheter into dialysis circuit, with imaging including radiological supervision and interpretation555$155.2K$279.688.10x
36558Insertion of central venous catheter for infusion, patient 5 years or older307$150.9K$491.595.50x
36581Replacement of central venous catheter257$119.2K$463.695.79x
35475Balloon dilation of narrowed or blocked upper arm artery, accessed through the skin105$103.0K$980.575.91x

Markup Analysis

Charge-to-Payment Ratio

5.16x

This provider submits charges 5.16 times higher than what Medicare actually pays.

What This Means

A markup ratio of 5.16x means for every $100 Medicare pays, this provider initially charges $516. This is higher 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 Interventional Radiology providers in CA for peer comparison.

Karl Weingarten (you)
$15.9M
Amiel Moshfegh, MD
$73.8M
Malwinder Singha, MD
$43.1M
Show detailed table โ–พ
ProviderLocationTotal PaymentsStatus
Amiel Moshfegh, MDCommerce, CA$73.8Mโœ“ Clear
Malwinder Singha, MDRancho Cucamonga, CA$43.1Mโœ“ Clear

Related

Browse
โ† Back to Provider Directory
State
All providers in CA โ†’
Specialty
All Interventional Radiology providers โ†’
Tool
Compare this provider โ†’
Analysis
Fraud Watchlist โ†’
Search
Search all providers โ†’

Share This Provider

Share this provider's Medicare payment information

Share:

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