2026 NPPES data Medical Toxicology (Emergency Medicine) Physician NPI 1598761918 MD
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Marc Bayer, MD

Medical Toxicology (Emergency Medicine) Physician in Avon, Connecticut.

This profile is drawn from the federal National Provider Identifier Registry (CMS NPPES), which lists more than 7 million U.S. healthcare providers - including 228 in Medical Toxicology (Emergency Medicine) Physician, and covers specialty classification, practice address, and Medicare Part D prescribing data when reported. According to CMS, every field reflects the provider's official federal registration, see our methodology.

Federal data, no proprietary rating. We show these CMS records as-is - no composite score, no star rating, no editorial opinion layered on top.
Compiled from official public sources by the PlainDoctor editorial team.

What the federal data shows

Marc Bayer, MD is a Medical Toxicology (Emergency Medicine) Physician in Avon, Connecticut, listed in the federal CMS National Provider Identifier registry.

Every figure on this page comes straight from federal CMS records (NPPES, Medicare Part D, MIPS, Open Payments) - no proprietary rating or editorial opinion is applied.

Board-eligible specialty (heuristic, not verified)

Marc Bayer, MD practices in an ABMS-board-eligible specialty but we don't have enough CMS-participation signals to confirm active board-certified status. Consult CertificationMatters.org (the official ABMS public lookup).

What does the federal data show about Marc Bayer, MD?

Quality data not reported

NPI registry status

Active

Issued 06/21/2005

NPI 1598761918

Primary specialty

Medical Toxicology (Emergency Medicine) Physician

Rare

228 US NPIs in this specialty

Specialty distribution in Connecticut

How Medical Toxicology (Emergency Medicine) Physician compares to other specialties among Connecticut providers

Connecticut providers
Clinical Social Worker - 8.4%Clinical Social Worker8.4%Student in an Organized Health Care Education/Training Program - 7.7%Student in an Organized Health Care Education/Training Program7.7%Physical Therapist - 4.2%Physical Therapist4.2%Pharmacist - 3.9%Pharmacist3.9%Internal Medicine Physician - 3.4%Internal Medicine Physician3.4%Mental Health Counselor - 3.2%Mental Health Counselor3.2%Medical Toxicology (Emergency Medicine) Physician - 0%Medical Toxicology (Emergency Medicine) Physician0%
Largest specialties in Connecticut (% of in-state providers)

Board certification

Not published by CMS

CMS does not publish a per-provider board-certification field in NPPES. PlainDoctor does not have a reliable per-specialty certification rate to show for Medical Toxicology (Emergency Medicine) Physician. Verify directly:

How MIPS and board certification work

The Merit-based Incentive Payment System (MIPS) scores providers 0–100 across four performance categories: Quality, Cost, Promoting Interoperability, and Improvement Activities, weighted under 42 CFR §414.1380. Reporting is voluntary for many small practices, so absence of a MIPS score is not a quality signal.

Board certification through an ABMS or AOA member board signals voluntary post-licensure examination plus continuous Maintenance of Certification cycles. Verify any individual provider's status through certificationmatters.org (ABMS) or osteopathic.org (AOA).

Marc Bayer, MD appears in the CMS NPPES registry as a Medical Toxicology (Emergency Medicine) Physician provider holding MD credentials at 10 WYNDEMERE, Avon, CT, 06001, with a listed phone of (860) 676-1444. NPI 1598761918 was issued on 06/21/2005.

Medicare Part D prescribing data is not currently published for this NPI, which typically means the provider either wrote fewer than 11 Part D claims in the most recent reporting year, does not participate in Medicare, or practices in a specialty that rarely prescribes outpatient drugs. Absence of prescribing data is not a quality signal, many Medical Toxicology (Emergency Medicine) Physician providers operate outside Part D entirely.

Medical Toxicology (Emergency Medicine) Physician is a narrow specialty nationwide, with 228 enrolled providers across 39 states and an average of 329 Part D claims per prescriber, so the context for interpreting these metrics differs meaningfully from a primary-care baseline.

Important: PlainDoctor is a directory of publicly available government data, not medical advice, a malpractice database, or a quality rating. Inclusion here does not imply a recommendation, and absence of complaints or sanctions on this page does not mean none exist, always verify credentials through the NPPES NPI Registry, your state medical board, and the ABMS or AOA before making healthcare decisions.

Practice Address

10 WYNDEMERE
Avon, CT 06001

Provider Details

NPI 1598761918
Specialty Medical Toxicology (Emergency Medicine) Physician
Credentials MD
Gender Male
NPI Issued 06/21/2005

Medical Toxicology (Emergency Medicine) Physician Overview

How Marc Bayer, MD fits within the Medical Toxicology (Emergency Medicine) Physician landscape nationally.

228
Medical Toxicology (Emergency Medicine) Physician Providers in US
39
States with Medical Toxicology (Emergency Medicine) Physician
329
Avg Claims per Provider

Nearby Medical Toxicology (Emergency Medicine) Physician Providers in Connecticut

Other clinicians with the same primary specialty enrolled in Connecticut, drawn from the same CMS NPPES roster as Bayer.

Compare Medical Toxicology (Emergency Medicine) Physician nationally: see state-by-state distribution →

Before you book an appointment

Use this federal record as your verification checklist, not as a recommendation.

  • Confirm the NPI record is current in the official CMS registry, providers update their own NPPES details, and moves can lag. Verify this NPI
  • Check the active license and any disciplinary history with the Connecticut medical board, federal registration is not a license check. Credential verification guide
  • Weigh a second option: compare this provider with a nearby Medical Toxicology (Emergency Medicine) Physician peer on Medicare volume and prescribing patterns. Compare providers

Medicare Part D and MIPS figures describe practice patterns in federal programs only, they are not quality ratings, and PlainDoctor does not rate, rank, or recommend providers.

Frequently Asked Questions

What is Marc Bayer, MD's specialty?
Marc Bayer, MD specializes in Medical Toxicology (Emergency Medicine) Physician and practices in Avon, Connecticut. Credentials: MD.
Where is Marc Bayer, MD located?
Marc Bayer, MD is located at 10 WYNDEMERE, Avon, CT, 06001. Phone: (860) 676-1444.
What is Marc Bayer, MD's NPI number?
Marc Bayer, MD's National Provider Identifier (NPI) is 1598761918, issued on 06/21/2005.
How many Medical Toxicology (Emergency Medicine) Physician providers are there in the US?
There are 228 Medical Toxicology (Emergency Medicine) Physician providers across 39 states in the US. The average Medical Toxicology (Emergency Medicine) Physician provider writes 329 Medicare Part D claims per year.
Does Marc Bayer, MD accept Medicare?
Marc Bayer, MD appears in CMS Medicare data. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify Marc Bayer, MD's credentials?
Marc Bayer, MD's NPI is 1598761918 with credentials MD. You can verify this through the NPPES NPI Registry, check state medical board records, and confirm board certification through the ABMS or AOA.

Data Sources

View source datasets and methodology notes
Provider Directory
CMS National Plan and Provider Enumeration System (NPPES), download.cms.gov/nppes, updated monthly. Contains NPI, specialty, credentials, and practice location.
Specialty Classification
NUCC Health Care Provider Taxonomy (nucc.org), the industry standard for classifying provider specialties in Medicare and Medicaid billing.
Limitations
Provider data is self-reported to CMS. Prescribing data reflects Medicare Part D only and does not include commercial insurance, Medicaid, or cash prescriptions. Claims below 11 beneficiaries are suppressed by CMS for privacy.

See our complete data methodology for details on how we collect and process government data.

Data as of April 2026 (NPPES) / 2023 (Medicare Part D). Source: Centers for Medicare & Medicaid Services (CMS).

Disclaimer: Data from CMS NPPES and Medicare Part D. PlainDoctor does not rate or rank providers. Provider information is self-reported and may not be current. Always verify information directly with the provider. About · Methodology

Compiled from official public sources by the PlainDoctor editorial team.

Every figure on PlainDoctor is rendered directly from the federal CMS NPPES registry, Medicare Part D, MIPS, and Open Payments records, no number is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of May 2026.