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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. William Crelin:

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  1. Qualifications
  2. What's important to you

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Patient Reviews

Patient comments (3)

The overall average patient rating of Dr. William Crelin is Average. Dr. Crelin has been reviewed by 10 patients who have provided 3 comments. The rating is 3 out of 5 stars.

Patient Ratings
Ease of Appointment 3.9
Promptness 4.2
Courteous Staff 3.7
Accurate Diagnosis 3.5
Bedside Manner 3.5
Spends Time with Me 3.2
Follows Up After Visit 2.5

Specialties & Research

Dr. William Crelin, MD is board certified in Internal Medicine.

  • He has special expertise in 3 areas:
  • Diabetes
  • Pituitary Diseases
  • Thyroid Diseases

Education & Awards

Dr. Crelin graduated from Medical College of Wisconsin, Milwaukee.


Dr. Crelin has 2 hospital affiliations:

  • Waukesha Memorial Hospital 
  • Oconomowoc Memorial Hospital 


  • English

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Additional Information
Dr. William C Crelin MD is a male Internist, has 29 years of experience and practices in Internal Medicine.
Where does Dr. William C. Crelin practice?
Dr. William Crelin has 1 office location.
Dr. William Crelin practices Internal Medicine near Waukesha, WI.
See Waukesha Internists.