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. Simon Fensterszaub
๐Ÿฉบ
DOIndividual

Simon Fensterszaub, D.O.

NPI: 1003077322
Brooklyn, NY
6 years of data
Family Practice
$17.0M
Total Payments
80
Beneficiaries
949.1K
Services
3.11x
Markup Ratio

Peer Comparison

99th
percentile in specialty
This provider$17.0M
Specialty median$55.2K

๐Ÿ“‹ Key Findings

1Billed $17.0M over 6 years
23.11x markup ratio (above median)
3Risk score: 71 โ€” flagged for review
499th percentile in Family Practice by payments
5633 services/day โ€” physically implausible
6Payments surged 2346% in 2022

โš ๏ธ Flagged for Review

Risk Score: 71
  • 490x specialty median spending
  • 269x specialty median beneficiaries
  • 1916x specialty median services
View Deep Dives โ†’Report Fraud โ†’

Statistical flag only โ€” not an accusation of fraud

โš ๏ธ This provider averages 633 services per working day โ€” physically unusual for an individual practitioner

Based on 949.1K total services over 6 years (250 working days/year). Learn about impossible service volumes โ†’

๐Ÿ”Ž Data Analysis

This provider's $17.0M in total Medicare payments ranks in the 99th percentile of Family Practice providers nationally.

Averaging 633 services per working day raises questions about billing patterns.

Medicare payments to this provider grew 233679% from 2017 to 2023.

This provider has been statistically flagged with a risk score of 71/100. 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 2346% 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
2017$317.03$69.404.57x$247.63$6.3K912
2019$340.39$73.264.65x$267.13$26.4K3617
2020$414.69$93.994.41x$320.70$12.3K1312
2021$2.1K$253.078.11x$1.8K$87.1K3443
2022$258.39$66.203.90x$192.19$2.1M32.2K27
2023$47.82$16.122.97x$31.70$14.8M916.0K39

Top Procedures (20)

K1034Provision of covid-19 test, nonprescription self-administered and self-collected use, fda approved, authorized or cleared, one test count
$9.6M
814.0K services$11.76/svc2.55x markup
99490Chronic care management services, first 20 minutes of clinical staff time directed by health care professional, per calendar monthโš  4.0x markup
$2.3M
46.5K services$49.29/svc4.05x markup
99439Chronic care management services for two or more chronic conditions, additional 20 minutes of clinical staff time directed by health care professional, per calendar month
$1.7M
45.4K services$37.23/svc2.40x markup
99305Initial nursing facility care with moderate level of medical decision making, per day, if using time, at least 35 minutesโš  6.8x markup
$940.4K
8.5K services$111.19/svc6.75x markup
M0223Intravenous injection, bebtelovimab, includes injection and post administration monitoring in the home or residence; this includes a beneficiary's home that has been made provider-based to the hospital during the covid-19 public health emergency
$461.9K
837 services$551.86/svc2.72x markup
99491Chronic care management services for two or more chronic conditions, first 30 minutes provided personally by health care professional, per calendar month
$353.7K
5.4K services$65.78/svc2.40x markup
99493Follow-up psychiatric collaborative care management, subsequent calendar month, first 60 minutesโš  3.3x markup
$288.7K
2.6K services$110.05/svc3.31x markup
99437Chronic care management services for two or more chronic conditions, additional 30 minutes provided personally by health care professional, per calendar monthโš  3.1x markup
$226.7K
4.9K services$46.41/svc3.13x markup
G0506Comprehensive assessment of and care planning for patients requiring chronic care management services (list separately in addition to primary monthly care management service)
$206.9K
5.5K services$37.43/svc2.90x markup
99492Initial psychiatric collaborative care management, first calendar month, first 70 minutesโš  3.2x markup
$183.4K
1.6K services$115.73/svc3.24x markup
M0244Intravenous infusion or subcutaneous injection, casirivimab and imdevimab includes infusion or injection, and post administration monitoring in the home or residence; this includes a beneficiary's home that has been made provider-based to the hospital duriโš  8.9x markup
$113.5K
140 services$810.70/svc8.91x markup
99484Care management services for behavioral health conditions, 20 minutes or more clinical staff time directed by health care professionalโš  3.3x markup
$105.4K
3.1K services$33.54/svc3.30x markup
99494Psychiatric collaborative care management per calendar month, each additional 30 minutesโš  4.5x markup
$78.3K
1.8K services$44.52/svc4.50x markup
99308Subsequent nursing facility care with straightforward level of medical decision making, per day, if using time, at least 15 minutesโš  6.1x markup
$61.4K
1.0K services$58.89/svc6.12x markup
G0438Annual wellness visit; includes a personalized prevention plan of service (pps), initial visit
$47.1K
294 services$160.22/svc1.56x markup
87811Detection test by immunoassay with direct visual observation for severe acute respiratory syndrome coronavirus 2 (covid-19)
$42.0K
1.0K services$41.10/svc1.95x markup
99426Principal care management services for a single high-risk disease, first 30 minutes of clinical staff time directed by health care professional, per calendar monthโš  3.5x markup
$39.3K
819 services$48.04/svc3.52x markup
99309Subsequent nursing facility care with moderate level of medical decision making, per day, if using time, at least 30 minutesโš  5.7x markup
$36.5K
415 services$88.00/svc5.71x markup
M0248Intravenous infusion, sotrovimab, includes infusion and post administration monitoring in the home or residence; this includes a beneficiary's home that has been made provider-based to the hospital during the covid-19 public health emergencyโš  13.1x markup
$34.4K
45 services$763.86/svc13.09x markup
99211Office or other outpatient visit for the evaluation and management of established patient that may not require presence of healthcare professionalโš  4.3x markup
$33.2K
1.4K services$23.79/svc4.28x markup
Show detailed table โ–พ
CodeDescriptionServicesPaymentsAvg/ServiceMarkup
K1034Provision of covid-19 test, nonprescription self-administered and self-collected use, fda approved, authorized or cleared, one test count814.0K$9.6M$11.762.55x
99490Chronic care management services, first 20 minutes of clinical staff time directed by health care professional, per calendar month46.5K$2.3M$49.294.05x
99439Chronic care management services for two or more chronic conditions, additional 20 minutes of clinical staff time directed by health care professional, per calendar month45.4K$1.7M$37.232.40x
99305Initial nursing facility care with moderate level of medical decision making, per day, if using time, at least 35 minutes8.5K$940.4K$111.196.75x
M0223Intravenous injection, bebtelovimab, includes injection and post administration monitoring in the home or residence; this includes a beneficiary's home that has been made provider-based to the hospital during the covid-19 public health emergency837$461.9K$551.862.72x
99491Chronic care management services for two or more chronic conditions, first 30 minutes provided personally by health care professional, per calendar month5.4K$353.7K$65.782.40x
99493Follow-up psychiatric collaborative care management, subsequent calendar month, first 60 minutes2.6K$288.7K$110.053.31x
99437Chronic care management services for two or more chronic conditions, additional 30 minutes provided personally by health care professional, per calendar month4.9K$226.7K$46.413.13x
G0506Comprehensive assessment of and care planning for patients requiring chronic care management services (list separately in addition to primary monthly care management service)5.5K$206.9K$37.432.90x
99492Initial psychiatric collaborative care management, first calendar month, first 70 minutes1.6K$183.4K$115.733.24x
M0244Intravenous infusion or subcutaneous injection, casirivimab and imdevimab includes infusion or injection, and post administration monitoring in the home or residence; this includes a beneficiary's home that has been made provider-based to the hospital duri140$113.5K$810.708.91x
99484Care management services for behavioral health conditions, 20 minutes or more clinical staff time directed by health care professional3.1K$105.4K$33.543.30x
99494Psychiatric collaborative care management per calendar month, each additional 30 minutes1.8K$78.3K$44.524.50x
99308Subsequent nursing facility care with straightforward level of medical decision making, per day, if using time, at least 15 minutes1.0K$61.4K$58.896.12x
G0438Annual wellness visit; includes a personalized prevention plan of service (pps), initial visit294$47.1K$160.221.56x
87811Detection test by immunoassay with direct visual observation for severe acute respiratory syndrome coronavirus 2 (covid-19)1.0K$42.0K$41.101.95x
99426Principal care management services for a single high-risk disease, first 30 minutes of clinical staff time directed by health care professional, per calendar month819$39.3K$48.043.52x
99309Subsequent nursing facility care with moderate level of medical decision making, per day, if using time, at least 30 minutes415$36.5K$88.005.71x
M0248Intravenous infusion, sotrovimab, includes infusion and post administration monitoring in the home or residence; this includes a beneficiary's home that has been made provider-based to the hospital during the covid-19 public health emergency45$34.4K$763.8613.09x
99211Office or other outpatient visit for the evaluation and management of established patient that may not require presence of healthcare professional1.4K$33.2K$23.794.28x

Markup Analysis

Charge-to-Payment Ratio

3.11x

This provider submits charges 3.11 times higher than what Medicare actually pays.

What This Means

A markup ratio of 3.11x means for every $100 Medicare pays, this provider initially charges $311. This is higher than the national average.

Location

Brooklyn, NY

Provider Verification

Always verify provider credentials and location before scheduling appointments. This data reflects Medicare payments and may not include all practice locations.

Related

Browse
โ† Back to Provider Directory
State
All providers in NY โ†’
Specialty
All Family Practice 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