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. Marilyn Norton
๐ŸŽ—๏ธ
MDIndividual

Marilyn Norton, MD

NPI: 1417060054
Chula Vista, CA
10 years of data
Hematology-Oncology
$3.7M
Total Payments
23.3K
Beneficiaries
81.8K
Services
2.06x
Markup Ratio

Peer Comparison

95th
percentile in specialty
This provider$3.7M
Specialty median$339.6K

๐Ÿ“‹ Key Findings

1Billed $3.7M over 10 years
22.06x markup ratio (above median)
395th percentile in Hematology-Oncology by payments
4Payments surged 72% in 2017
54 procedures with >3x markup
โœ“ No flags detected

๐Ÿ”Ž Data Analysis

This provider's $3.7M in total Medicare payments ranks in the 95th percentile of Hematology-Oncology providers nationally.

This provider's billing patterns fall within normal ranges for their specialty.

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 72% in 2017

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$252.15$127.001.99x$125.15$441.4K7.8K2.2K
2015$338.92$166.442.04x$172.48$434.9K7.2K2.2K
2016$101.40$41.962.42x$59.44$281.2K8.1K2.3K
2017$350.76$192.841.82x$157.92$483.4K7.5K2.2K
2018$364.90$205.751.77x$159.15$402.3K7.5K2.2K
2019$384.54$176.492.18x$208.05$405.4K7.5K2.4K
2020$103.58$44.002.35x$59.58$292.8K8.4K2.3K
2021$120.64$56.232.15x$64.41$346.8K9.7K2.7K
2022$127.67$51.892.46x$75.78$286.0K9.1K2.5K
2023$132.44$53.822.46x$78.62$295.6K9.2K2.5K

Top Procedures (20)

99214Established patient office or other outpatient, visit typically 25 minutes
$925.4K
11.0K services$84.21/svc1.79x markup
J2505Injection, pegfilgrastim, 6 mg
$731.2K
237 services$3.1K/svc1.81x markup
99233Subsequent hospital inpatient care, typically 35 minutes per day
$423.1K
5.0K services$85.28/svc1.84x markup
96413Infusion of chemotherapy into a vein up to 1 hour
$416.6K
3.5K services$118.71/svc2.50x markup
85025Complete blood cell count (red cells, white blood cell, platelets), automated test
$167.2K
18.7K services$8.93/svc1.79x markup
99213Established patient office or other outpatient visit, typically 15 minutes
$157.8K
2.4K services$64.98/svc1.92x markup
J9310Injection, rituximab, 100 mg
$126.4K
196 services$644.95/svc1.58x markup
99205New patient office or other outpatient visit, typically 60 minutes
$116.0K
736 services$157.58/svc1.77x markup
99223Initial hospital inpatient care, typically 70 minutes per day
$83.9K
534 services$157.08/svc1.96x markup
96372Injection beneath the skin or into muscle for therapy, diagnosis, or preventionโš  3.0x markup
$80.3K
5.4K services$14.75/svc3.05x markup
36415Insertion of needle into vein for collection of blood sample
$60.2K
16.7K services$3.60/svc2.78x markup
96417Infusion of different chemotherapy drug or substance into a vein up to 1 hour
$56.9K
974 services$58.37/svc2.54x markup
96374Injection of drug or substance into a vein for therapy, diagnosis, or prevention
$38.2K
977 services$39.12/svc2.27x markup
99204New patient office or other outpatient visit, typically 45 minutes
$31.2K
252 services$123.77/svc2.02x markup
96415Infusion of chemotherapy into a vein
$28.4K
1.1K services$25.51/svc2.74x markup
96367Infusion into a vein for therapy prevention or diagnosis additional sequential infusion up to 1 hour
$27.4K
1.0K services$26.63/svc2.20x markup
96375Injection of different drug or substance into a vein for therapy, diagnosis, or preventionโš  3.0x markup
$27.0K
1.7K services$16.25/svc3.01x markup
99232Subsequent hospital inpatient care, typically 25 minutes per dayโš  3.1x markup
$20.8K
349 services$59.74/svc3.08x markup
Q5108Injection, pegfilgrastim-jmdb, biosimilar, (fulphila), 0.5 mgโš  3.1x markup
$19.8K
147 services$134.51/svc3.09x markup
96365Infusion into a vein for therapy, prevention, or diagnosis up to 1 hour
$15.9K
287 services$55.25/svc2.12x markup
Show detailed table โ–พ
CodeDescriptionServicesPaymentsAvg/ServiceMarkup
99214Established patient office or other outpatient, visit typically 25 minutes11.0K$925.4K$84.211.79x
J2505Injection, pegfilgrastim, 6 mg237$731.2K$3.1K1.81x
99233Subsequent hospital inpatient care, typically 35 minutes per day5.0K$423.1K$85.281.84x
96413Infusion of chemotherapy into a vein up to 1 hour3.5K$416.6K$118.712.50x
85025Complete blood cell count (red cells, white blood cell, platelets), automated test18.7K$167.2K$8.931.79x
99213Established patient office or other outpatient visit, typically 15 minutes2.4K$157.8K$64.981.92x
J9310Injection, rituximab, 100 mg196$126.4K$644.951.58x
99205New patient office or other outpatient visit, typically 60 minutes736$116.0K$157.581.77x
99223Initial hospital inpatient care, typically 70 minutes per day534$83.9K$157.081.96x
96372Injection beneath the skin or into muscle for therapy, diagnosis, or prevention5.4K$80.3K$14.753.05x
36415Insertion of needle into vein for collection of blood sample16.7K$60.2K$3.602.78x
96417Infusion of different chemotherapy drug or substance into a vein up to 1 hour974$56.9K$58.372.54x
96374Injection of drug or substance into a vein for therapy, diagnosis, or prevention977$38.2K$39.122.27x
99204New patient office or other outpatient visit, typically 45 minutes252$31.2K$123.772.02x
96415Infusion of chemotherapy into a vein1.1K$28.4K$25.512.74x
96367Infusion into a vein for therapy prevention or diagnosis additional sequential infusion up to 1 hour1.0K$27.4K$26.632.20x
96375Injection of different drug or substance into a vein for therapy, diagnosis, or prevention1.7K$27.0K$16.253.01x
99232Subsequent hospital inpatient care, typically 25 minutes per day349$20.8K$59.743.08x
Q5108Injection, pegfilgrastim-jmdb, biosimilar, (fulphila), 0.5 mg147$19.8K$134.513.09x
96365Infusion into a vein for therapy, prevention, or diagnosis up to 1 hour287$15.9K$55.252.12x

Markup Analysis

Charge-to-Payment Ratio

2.06x

This provider submits charges 2.06 times higher than what Medicare actually pays.

What This Means

A markup ratio of 2.06x means for every $100 Medicare pays, this provider initially charges $206. This is higher than the national average.

Location

Chula Vista, 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 Hematology-Oncology providers in CA for peer comparison.

Marilyn Norton (you)
$3.7M
Luke Dreisbach, M.D.
$77.2M
Sachin Gupta, M.D.
$55.1M
Ravi Rao, MDโš ๏ธ
$49.1M
Michael Sherman, M.D., PHD
$38.9M
Nerses Tchekmedyian, M.D.
$38.0M
Show detailed table โ–พ
ProviderLocationTotal PaymentsStatus
Luke Dreisbach, M.D.Rancho Mirage, CA$77.2Mโœ“ Clear
Sachin Gupta, M.D.Fresno, CA$55.1Mโœ“ Clear
Ravi Rao, MDFresno, CA$49.1Mโš ๏ธ Flagged
Michael Sherman, M.D., PHDWalnut Creek, CA$38.9Mโœ“ Clear
Nerses Tchekmedyian, M.D.Irvine, CA$38.0Mโœ“ Clear

Related

Browse
โ† Back to Provider Directory
State
All providers in CA โ†’
Specialty
All Hematology-Oncology 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