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Internist, Critical Care Specialist, Pulmonologist (lungs), Sleep Medicine Specialist
27 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. John Clark:

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  1. Qualifications
  2. What's important to you

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Patient Reviews

Patient comments (2)

The overall average patient rating of Dr. John Clark is Average. Dr. Clark has been reviewed by 5 patients who have provided 2 comments. The rating is 3 out of 5 stars.

Patient Ratings
Ease of Appointment 3.0
Promptness 3.7
Courteous Staff 3.3
Accurate Diagnosis 2.0
Bedside Manner 2.3
Spends Time with Me 2.3
Follows Up After Visit 2.3

Specialties & Research

Dr. John Clark, MD is board certified in Internal Medicine, Critical Care Medicine, Pulmonary Disease, and Sleep Medicine.

  • He has special expertise in 2 areas:
  • Asthma
  • Insomnia

Education & Awards

Dr. Clark graduated from University of Tennessee, Memphis.


Dr. Clark has 7 hospital affiliations:

  • Spartanburg Regional Medical Center 
  • Greenville Memorial Hospital 


  • English

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Additional Information
Dr. John Douglas Clark MD is a male Internist, has 27 years of experience and practices in Internal Medicine, Pulmonary Disease, Critical Care Medicine, and Sleep Medicine.
Where does Dr. John D. Clark practice?
Dr. John Clark has 1 office location.
Dr. John Clark practices Internal Medicine, Pulmonary Disease, Critical Care Medicine, and Sleep Medicine near Spartanburg, SC.
See Spartanburg Internists, Spartanburg Pulmonologists, Spartanburg Critical Care Practitioners, and Spartanburg Sleep Medicine Doctors.