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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. Joan Merrill:

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  1. Qualifications
  2. What's important to you

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Patient Reviews

Patient comments (4)

The overall average patient rating of Dr. Joan Merrill is Excellent. Dr. Merrill has been reviewed by 6 patients who have provided 4 comments. The rating is 5 out of 5 stars.

Patient Ratings
Ease of Appointment 3.9
Promptness 3.4
Courteous Staff 4.7
Accurate Diagnosis 4.7
Bedside Manner 5.0
Spends Time with Me 4.7
Follows Up After Visit 5.0

Specialties & Research

Dr. Joan Merrill, MD is board certified in Internal Medicine.

  • She has special expertise in 6 areas:
  • Antiphospholipid Syndrome (APS)
  • Arthritis
  • Rheumatic Diseases
  • Rheumatoid Arthritis
  • Rheumatology
  • Systemic Lupus Erythematosus (SLE)

Education & Awards

Dr. Merrill graduated from Cornell University, New York. She has 5 awards.

One of America's Leading Experts on:
Antiphospholipid Syndrome
Systemic Lupus Erythematosus
Castle Connolly's Top Doctors™ (2012 - 2013)
Patients' Choice Award (2011, 2014)
Compassionate Doctor Recognition (2011, 2014)


Dr. Merrill has 7 hospital affiliations:

  • St Anthony Hospital 
  • OU Medical Center 


  • Arabic
  • French
  • Spanish
  • Japanese

> > > > Dr. Joan Merrill, MD

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Additional Information
Dr. Joan T Merrill MD is a female Internist, has 26 years of experience and practices in Internal Medicine.
Where does Dr. Joan T. Merrill practice?
Dr. Joan Merrill has 1 office location.
Dr. Joan Merrill practices Internal Medicine near Oklahoma City, OK.
See Oklahoma City Internists.