Skip to main content
NPITelehealth
SpecialtiesLocationsJournalAbout
ProvidersRegistry Search
CMS Data Source
NPI Registry Data
Expert Editorial
NPITelehealth

Finding a doctor shouldn't be a guessing game. We connect patients with verified healthcare professionals using official federal data.

Explore

  • Search
  • Specialties
  • Locations
  • Guides

Resources

  • Methodology
  • Editorial
  • For Providers
  • Sitemap

Legal

  • About
  • Contact
  • Privacy
  • Terms

© 2026 NPI Telehealth

US Registry Operational
CMS Source

Informational purposes only — not medical advice. Always consult a professional. Data updated weekly. Read full disclaimer.

PrivacyTermsEditorialDisclaimer
Online Internal Medicine Doctors | Telehealth & Virtual Visits | NPI Telehealth | NPI Telehealth
SPECIALTY DISCOVERY ACTIVE 2026

Internal Medicine.

Find and book verified Internal Medicine specialists. Access NPI credentials, office locations, and virtual care availability.

VERIFIED SPECIALISTS

Active medical practitioners in Internal Medicine clinical focus.

62,216 ENTRIES FOUND
NPI: 1255368866
VIRTUAL ACTIVE

John Michael Krehlik, M.D.

Internal Medicine

CREDENTIALS VERIFIED 2026
Anchorage, AK
UNIVERSITY OF CHICAGO, PRITZKER SCHOOL OF MEDICINE (1975)
20+ Years Exp.
ACCESS PROFILE
NPI: 1255368767
VIRTUAL ACTIVE

Mark Anthony Stankewicz, MD

Internal Medicine

CREDENTIALS VERIFIED 2026
Nashville, TN
UNIVERSITY OF CONNECTICUT SCHOOL OF MEDICINE (1999)
20+ Years Exp.
ACCESS PROFILE
NPI: 1255368494
VIRTUAL ACTIVE

Mark Collins, MD

Internal Medicine

CREDENTIALS VERIFIED 2026
Osterville, MA
UNIVERSITY OF CONNECTICUT SCHOOL OF MEDICINE (1989)
20+ Years Exp.
ACCESS PROFILE
NPI: 1255368460
VIRTUAL ACTIVE

Joseph R Lee, M.D.

Internal Medicine

CREDENTIALS VERIFIED 2026
Colorado Springs, CO
McGovern Medical School at UTHealth Houston (1989)
20+ Years Exp.
ACCESS PROFILE
NPI: 1255367512
VIRTUAL ACTIVE

Peter J Kambelos, M.D.

Internal Medicine

CREDENTIALS VERIFIED 2026
Cincinnati, OH
University of Louisville School of Medicine (1993)
20+ Years Exp.
ACCESS PROFILE
NPI: 1255367355
VIRTUAL ACTIVE

William James Schwartz, MD

Internal Medicine

CREDENTIALS VERIFIED 2026
Long Island City, NY
Albert Einstein College of Medicine (1975)
20+ Years Exp.
ACCESS PROFILE
NPI: 1255367157
VIRTUAL ACTIVE

Obaid Rehman, MD

Internal Medicine

CREDENTIALS VERIFIED 2026
Savannah, GA
OFFICIAL REGISTRY DATA
20+ Years Exp.
ACCESS PROFILE
NPI: 1255366845
VIRTUAL ACTIVE

Stephen Saxe Greenspan, M.D.

Internal Medicine

CREDENTIALS VERIFIED 2026
Philadelphia, PA
Sidney Kimmel Medical College at Thomas Jefferson University (1987)
20+ Years Exp.
ACCESS PROFILE
NPI: 1255366613
VIRTUAL ACTIVE

Leslie Ramirez Bailey, M.D.

Internal Medicine

CREDENTIALS VERIFIED 2026
Seattle, WA
McGovern Medical School at UTHealth Houston (1993)
20+ Years Exp.
ACCESS PROFILE
NPI: 1255366407
VIRTUAL ACTIVE

John A Lewis, MD

Internal Medicine

CREDENTIALS VERIFIED 2026
West Roxbury, MA
New York Medical College (1993)
20+ Years Exp.
ACCESS PROFILE
NPI: 1255366217
VIRTUAL ACTIVE

Paul Samuel Hicks, M.D.

Internal Medicine

CREDENTIALS VERIFIED 2026
Elmira, NY
MEHARRY MEDICAL COLLEGE SCHOOL OF MEDICINE (1985)
20+ Years Exp.
ACCESS PROFILE
NPI: 1255366142
VIRTUAL ACTIVE

Peter Cawood Butler, MD

Internal Medicine

CREDENTIALS VERIFIED 2026
Los Angeles, CA
OFFICIAL REGISTRY DATA
20+ Years Exp.
ACCESS PROFILE
NPI: 1255365995
VIRTUAL ACTIVE

Julia H Lindenberg, M.D.

Internal Medicine

CREDENTIALS VERIFIED 2026
Boston, MA
Icahn School of Medicine at Mount Sinai (2003)
20+ Years Exp.
ACCESS PROFILE
NPI: 1255365979
VIRTUAL ACTIVE

Susan Margaret Zimmer, M.D.

Internal Medicine

CREDENTIALS VERIFIED 2026
Tampa, FL
UNIVERSITY OF SOUTH FLORIDA COLLEGE OF MEDICINE (1986)
20+ Years Exp.
ACCESS PROFILE
NPI: 1255365912
VIRTUAL ACTIVE

Carlos Oscar Del Alcazar, MD

Internal Medicine

CREDENTIALS VERIFIED 2026
Old Bridge, NJ
Columbia University Vagelos College of Physicians and Surgeons (1982)
20+ Years Exp.
ACCESS PROFILE
NPI: 1255364105
VIRTUAL ACTIVE

Christopher J Ko, M.D.

Internal Medicine

CREDENTIALS VERIFIED 2026
Vienna, VA
Northwestern University Feinberg School of Medicine (2003)
20+ Years Exp.
ACCESS PROFILE
NPI: 1255363727
VIRTUAL ACTIVE

MARGARET L. ISAAC, M.D.

Internal Medicine

CREDENTIALS VERIFIED 2026
SEATTLE, WA
UNIVERSITY OF WASHINGTON SCHOOL OF MEDICINE (2003)
20+ Years Exp.
ACCESS PROFILE
NPI: 1255362604
VIRTUAL ACTIVE

Edward J Choi, M.D.

Internal Medicine

CREDENTIALS VERIFIED 2026
Neptune, NJ
OFFICIAL REGISTRY DATA
20+ Years Exp.
ACCESS PROFILE
NPI: 1255362422
VIRTUAL ACTIVE

Simin Siddiq, M.D.

Internal Medicine

CREDENTIALS VERIFIED 2026
Fremont, CA
OFFICIAL REGISTRY DATA
20+ Years Exp.
ACCESS PROFILE
NPI: 1255361945
VIRTUAL ACTIVE

Shiri Etzioni, MD

Internal Medicine

CREDENTIALS VERIFIED 2026
Scottsdale, AZ
Albany Medical College (2000)
20+ Years Exp.
ACCESS PROFILE
  • Previous
  • 1
  • More pages
  • 2332
  • 2333
  • 2334
  • More pages
  • 3111
  • Next

Why Choose a Verified Internal Medicine Specialist?

Selecting a Internal Medicine is a personal decision that impacts your long-term health. Whether you are seeking treatment for a specific condition or looking for a second opinion, we provide access to a verified list of practicing specialists.

We recommend reviewing clinical background, years of practice, and verified patient experiences before scheduling your visit. Many Internal Medicines now offer telehealth services, allowing you to receive expert medical advice from the comfort of your home.

Institutional Data Integrity

Every provider on NPI Telehealth is verified against the National Plan and Provider Enumeration System (NPPES). We ensure that you connect with licensed, active professionals who meet federal clinical standards.

100% VERIFIED CREDENTIALS
REAL-TIME REGISTRY UPDATES