2026 NPPES data Interventional Cardiology Physician NPI 1639284888 MD
Verify on CMS →

Thomas Messer, MD

Interventional Cardiology Physician in Hattiesburg, Mississippi.

This profile is drawn from the federal National Provider Identifier Registry (CMS NPPES), which lists more than 7 million U.S. healthcare providers - including 3,382 in Interventional Cardiology 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

Thomas Messer, MD is a Interventional Cardiology Physician in Hattiesburg, Mississippi, 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)

Thomas Messer, 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 Thomas Messer, MD?

Quality data not reported

NPI registry status

Active

Issued 08/20/2006

NPI 1639284888

Primary specialty

Interventional Cardiology Physician

Niche

3,382 US NPIs in this specialty

Specialty distribution in Mississippi

How Interventional Cardiology Physician compares to other specialties among Mississippi providers

Mississippi providers
Family Nurse Practitioner - 8.8%Family Nurse Practitioner8.8%Mental Health Counselor - 8.1%Mental Health Counselor8.1%Pharmacist - 5.6%Pharmacist5.6%Student in an Organized Health Care Education/Training Program - 5%Student in an Organized Health Care Education/Training Program5%Physical Therapist - 4.2%Physical Therapist4.2%Speech-Language Pathologist - 3.7%Speech-Language Pathologist3.7%Interventional Cardiology Physician - 0.1%Interventional Cardiology Physician0.1%
Largest specialties in Mississippi (% 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 Interventional Cardiology 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).

Thomas Messer, MD appears in the CMS NPPES registry as a Interventional Cardiology Physician provider holding MD credentials at 415 S 28TH AVE, Hattiesburg, MS, 39401, with a listed phone of (601) 268-5800. NPI 1639284888 was issued on 08/20/2006.

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 Interventional Cardiology Physician providers operate outside Part D entirely.

Interventional Cardiology Physician is a narrow specialty nationwide, with 3,382 enrolled providers across 53 states and an average of 2,984 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

415 S 28TH AVE
Hattiesburg, MS 39401

Provider Details

NPI 1639284888
Specialty Interventional Cardiology Physician
Credentials MD
Gender Male
NPI Issued 08/20/2006

Interventional Cardiology Physician Overview

How Thomas Messer, MD fits within the Interventional Cardiology Physician landscape nationally.

3,382
Interventional Cardiology Physician Providers in US
53
States with Interventional Cardiology Physician
2,984
Avg Claims per Provider

Nearby Interventional Cardiology Physician Providers in Mississippi

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

Compare Interventional Cardiology 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 Mississippi medical board, federal registration is not a license check. Credential verification guide
  • Weigh a second option: compare this provider with a nearby Interventional Cardiology 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 Thomas Messer, MD's specialty?
Thomas Messer, MD specializes in Interventional Cardiology Physician and practices in Hattiesburg, Mississippi. Credentials: MD.
Where is Thomas Messer, MD located?
Thomas Messer, MD is located at 415 S 28TH AVE, Hattiesburg, MS, 39401. Phone: (601) 268-5800.
What is Thomas Messer, MD's NPI number?
Thomas Messer, MD's National Provider Identifier (NPI) is 1639284888, issued on 08/20/2006.
How many Interventional Cardiology Physician providers are there in the US?
There are 3,382 Interventional Cardiology Physician providers across 53 states in the US. The average Interventional Cardiology Physician provider writes 2,984 Medicare Part D claims per year.
Does Thomas Messer, MD accept Medicare?
Thomas Messer, MD appears in CMS Medicare data. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify Thomas Messer, MD's credentials?
Thomas Messer, MD's NPI is 1639284888 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.