Browse Health
Emergency Physician, Internist
34 years of experience
Accepting new patients
License & Identifications

A medical license is required for a doctor to practice medicine in a particular state. Requirements vary by state but most require, at a minimum, post-graduate training in the doctor’s specific specialty. An NPI number is a national identifier unique to an individual health care provider and is managed by the Center for Medicare & Medicaid Services (CMS).

Learn more about Dr. Lewis Sierra:

View the full profile to get information on:

  1. Qualifications
  2. What's important to you

View full profile

Patient Reviews

Have you visited Dr. Sierra? Share your experience.
Write a Review

Specialties & Research

Dr. Lewis Sierra, MD is board certified in Internal Medicine.

Education & Awards

Dr. Sierra graduated from University of Wisconsin at Madison.


Dr. Sierra has 1 hospital affiliations:

  • St Agnes Hospital 

> > > > Dr. Lewis Sierra, MD

Similar doctors nearby

Dr. Albert Bryan

Internal Medicine
Fond Du Lac, WI

Dr. Elpidio Ayala

Internal Medicine
37 years experience
Fond Du Lac, WI

Dr. Michael Martinez

31 years experience
Fond Du Lac, WI

Dr. Jeanna Owens

Internal Medicine
31 years experience
Fond Du Lac, WI

Dr. Maria Ignacio

Internal Medicine
22 years experience
Fond Du Lac, WI

Dr. Elsa Doroin-horn

Internal Medicine
47 years experience
Fond Du Lac, WI
Search All Similar Doctors
Additional Information
Dr. Lewis Albert Sierra MD is a male Emergency Medicine Specialist, has 34 years of experience and practices in Internal Medicine and Emergency Medicine.
Where does Dr. Lewis A. Sierra practice?
Dr. Lewis Sierra has 1 office location.
Dr. Lewis Sierra practices Internal Medicine and Emergency Medicine near Fond Du Lac, WI.
See Fond Du Lac Internists and Fond Du Lac Emergency Physicians.