Medicare Enrolled

Dr. Marshall Contreras, M.D.

Ophthalmology · Turlock, CA
Practice pattern: Clinical Cardiology — Primarily office-based clinical cardiology
Low-engagement
880 DELBON AVE, Turlock, CA 95382
2096342925
In practice since 2006 (20 years)
NPI: 1760453096 verify on NPPES ↗
Very High
DATA COVERAGE
Data in 4 of 4 federal sources
Measures public federal data availability — not provider quality
Informational, not a quality rating. This page presents federal public records about Dr. Contreras from CMS (NPPES, Open Payments, Medicare Provider Utilization, PECOS). It is not medical advice, an endorsement, or a judgment of clinical quality. Always consult the provider directly and a licensed clinician for medical decisions. Read methodology →
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What this data tells you about Dr. Contreras

Dr. Marshall Contreras is an ophthalmology specialist in Turlock, CA, with 20 years of NPI registration. Based on federal Medicare data, Dr. Contreras performed 1,067 Medicare services across 896 unique beneficiaries.

Between the years covered by Open Payments, Dr. Contreras received a total of $777 from 12 pharmaceutical and/or device companies across 36 individual payments. These payments are legal, publicly disclosed under the federal Sunshine Act, and common in ophthalmology. Most payments are for meals and travel — low-value interactions common across virtually all practicing physicians. Patients may wish to discuss these relationships with their provider.

The Data Coverage level for Dr. Contreras is Very High — reflecting how much public federal data is available about this provider. Patients are encouraged to use this data as one of several factors when choosing a healthcare provider.

✓ 20 years in practice ▲ 1,067 Medicare services $777 industry payments

Medicare Practice Summary

Medicare Utilization ↗
1,067
Medicare services
Bottom 36% in CA for ophthalmology
Lower Medicare volume may reflect subspecialty focus, hospital-based work, or a higher share of non-Medicare patients.
896
Unique beneficiaries
$67
Avg. Medicare payment
Medicare patients only (65+ / disabled) · How to read this →
~53 Medicare services per year of practice

Top procedures by volume

Ranked by number of services performed for Medicare patients. Avg. submitted charge is what the provider billed; avg. Medicare payment is what CMS paid.

Procedure Volume Avg. paid Avg. submitted
Comprehensive eye exam, established patient
A comprehensive examination of the visual system performed for a patient who has previously been seen by the provider.
 328 $85 $198
Office visit, established patient (20-29 min)
An office visit for an existing patient lasting between 20 and 29 minutes. The visit involves medical evaluation and management of the patient's condition.
 290 $63 $114
Optic nerve imaging (OCT scan)
Imaging of the optic nerve.
 125 $26 $120
Visual field test, extended
A test that maps your complete field of vision to detect blind spots or peripheral vision loss. Extended testing provides a more detailed assessment than a standard visual field exam.
 99 $43 $120
Retinal imaging (OCT scan)
This procedure involves imaging the retina to visualize its structure. It is used to examine the back of the eye.
 79 $31 $120
Comprehensive eye exam, new patient
A comprehensive examination of the visual system performed for a new patient.
 55 $90 $237
Eye exam, established patient, focused
A limited examination of the visual system for an existing patient. The provider focuses on a specific eye-related concern or symptom.
 55 $71 $138
Laser removal of recurring cataract
A laser procedure to remove a recurring cataract within the lens capsule.
 20 $271 $807
New patient eye exam, problem focused
A focused examination of the visual system performed during a new patient visit.
 16 $56 $150
How to read this data: This reflects Medicare patients only (typically 65+). Payment amounts are what Medicare paid the provider, not your out-of-pocket cost. A higher procedure volume generally indicates more experience with that procedure.

Industry Payment Transparency

Open Payments through 2023 ↗
$777
Total received (2018-2023)
Avg $129/year across 6 years
Bottom 38% in CA for ophthalmology
12
Companies
36
Individual payments
All payments are legal and publicly reported · Not evidence of wrongdoing · How to interpret →

Payment profile

Industry payments classified by relationship type. Not all payments are equal — research and consulting reflect different relationships than speaking programs or meals.

Meals & Travel
Food, beverages, travel, and lodging — typically low-value
$777 (100.0%)

Payment trend by year

Annual totals from pharmaceutical and medical device companies.

2023
$40
2022
$115
2021
$148
2020
$204
2019
$147
2018
$123

Payments by company (2023)

Consulting
Speaking
Meals & Travel
Research
Alcon Vision LLC
$23
Horizon Therapeutics plc
$17
Top 3 companies account for 100.0% of 2023 payments
All-time payments by company (2018-2023) ›
Glaukos Corporation
$180
Allergan, Inc.
$113
Novartis Pharmaceuticals Corporation
$101
Sun Pharmaceutical Industries Inc.
$70
Horizon Therapeutics plc
$62
Kala Pharmaceuticals, Inc.
$55
Mallinckrodt Hospital Products Inc.
$51
Alcon Vision LLC
$47
Carl Zeiss Meditec AG
$39
Aerie Pharmaceuticals, Inc.
$34
Allergan Inc.
$14
Bausch & Lomb, a division of Bausch Health US, LLC
$12
Top 3 companies account for 50.8% of all-time payments
Associated products mentioned in payments ›
ACTHAR · Cequa · DUREZOL · DURYSTA · HYDRUS Microstent · INVELTYS · ISTENT TRABECULAR MICRO-BYPASS STENT SYSTEM · LUMIGAN · None Specified · Rhopressa · TEPEZZA · TRAVATAN Z · VYZULTA · XELPROS · XIIDRA · iStent Trabecular Micro-Bypass Stent System · iStent inject W · rocklatan
Should you be concerned? Payments from pharmaceutical and device companies are legal and common — 57% of U.S. physicians receive at least one. They often reflect legitimate consulting, research, or education. What matters is whether a recommended drug or device appears in your doctor's payment records. If so, consider asking your doctor about it. How to interpret this data →

Most payments (100%) are for meals and travel — low-value interactions that are common across virtually all practicing physicians.

Looking for an ophthalmology specialist in Turlock?
Compare ophthalmologists in the Turlock area by procedure volume, costs, and industry payment transparency.
Browse ophthalmologists nearby

Geographic Context

Ophthalmologists within 10 mi
16
Per 100K population
2.9
County median income
$79,661
Nearest hospital
EMANUEL MEDICAL CENTER
0.0 mi

Data Sources

Provider Registry ✓ NPPES Weekly updates
Medicare Enrollment ✓ PECOS Monthly updates
Practice Data ✓ Medicare Util. Annual (CY lag)
Industry Payments ✓ Open Payments CY 2023
Disciplinary History — Not public N/A

This provider has data in 4 of 4 available federal datasets, with a Data Coverage level of Very High. This reflects how much public data is available about a provider. How we calculate this →

Summary

Dr. Contreras is a clinical cardiology specialist, with moderate Medicare volume, with low-engagement industry engagement, with 20 years of NPI registration.

This summary is auto-generated from federal data, describing data availability and patterns. Read our methodology →

Frequently Asked Questions

Is Dr. Contreras experienced with comprehensive eye exam, established patient?
Based on Medicare claims data, Dr. Contreras performed 328 comprehensive eye exam, established patient services. Research suggests that higher procedure volume is often associated with better outcomes, particularly for complex procedures. Note that Medicare data only captures patients aged 65 and older, so the total practice volume across all patients is likely higher.
Does Dr. Contreras receive payments from pharmaceutical companies?
Yes. Dr. Contreras received a total of $777 from 12 companies across 36 individual payments. These payments are legal, publicly disclosed under the federal Sunshine Act, and common among physicians — 57% of all U.S. physicians receive at least one industry payment. Patients may wish to ask their doctor about these relationships, especially if a recommended drug or device appears in the payment records.
How do Dr. Contreras's costs compare to other ophthalmologists in Turlock?
Dr. Contreras's average Medicare payment per service is $67. Note that these figures represent what Medicare pays, not your out-of-pocket cost, which depends on your specific insurance plan and deductible. Procedure-level data above shows both what was submitted and what Medicare paid for each service type.
What does Data Coverage mean?
Data Coverage (currently Very High for Dr. Contreras) measures how much public federal data is available about a provider. It is not a quality rating. A "Very High" or "High" level means the provider has data across multiple federal sources (NPPES, PECOS, Medicare Utilization, Open Payments), indicating a long track record of practice, Medicare participation, and industry disclosure. A "Low" or "Moderate" level may simply mean the provider is newer, does not see Medicare patients, or has not received any industry payments — none of which are inherently negative. Read our full methodology →
Is this data up to date?
Each data source has its own update cycle. Provider registry data (NPPES) is updated weekly. Medicare enrollment (PECOS) is updated monthly. Medicare practice data has a ~2 year lag — the most recent available is typically 2 years prior. Industry payment data (Open Payments) is published annually, usually in June, covering the prior calendar year. We display the data date prominently on each section so you always know how current it is. See our data freshness policy →

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About this page

All data on this page is sourced verbatim from public federal records published by the U.S. Centers for Medicare & Medicaid Services (CMS): NPPES ↗, Open Payments ↗, Medicare Provider Utilization ↗, and PECOS. Publication is mandated by the Physician Payments Sunshine Act (§6002 ACA, 42 U.S.C. §1320a-7h) and the Freedom of Information Act.

This page is not medical advice, an endorsement, a recommendation, or a quality rating. Data Coverage reflects data completeness — how much federal information exists for this provider — not clinical performance, patient outcomes, or quality of care. Always verify information directly with the provider and consult a licensed clinician before making medical decisions.

Provider corrections: Provider portal · Privacy questions: Privacy Policy · Terms: Terms of Use · Methodology: Methodology

Data Disclaimer — Data sourced from the Centers for Medicare & Medicaid Services (CMS): National Plan and Provider Enumeration System (NPPES), Open Payments program, Medicare Provider Utilization and Payment Data, and Provider Enrollment & Certification data (PECOS). Published under the Freedom of Information Act (FOIA). This website is not affiliated with, endorsed by, or authorized by CMS, HHS, or the U.S. Government. Data may contain errors as reported to CMS by providers and reporting entities. Payments from industry are legal and do not indicate wrongdoing. Medicare data reflects only patients aged 65+ or those with qualifying disabilities. For corrections, contact CMS directly. This information does not constitute medical advice and should not be used as the sole basis for choosing a healthcare provider. Procedure descriptions use plain language and do not reference CPT® codes, which are copyrighted by the American Medical Association. Full methodology → · Report a data error → · Privacy policy →