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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).

Patient Reviews

Patient comments (11)

The overall average patient rating of Dr. John Blackman is Good. Dr. Blackman has been reviewed by 25 patients who have provided 11 comments. The rating is 4 out of 5 stars.

Patient Ratings
Ease of Appointment 4.0
Promptness 3.9
Courteous Staff 4.2
Accurate Diagnosis 4.2
Bedside Manner 4.2
Spends Time with Me 4.3
Follows Up After Visit 4.4

Specialties & Research

Dr. John Blackman, MD is board certified in Internal Medicine.

  • He has special expertise in 6 areas:
  • Diabetes
  • Diabetes Complications
  • Diabetes Mellitus
  • Metabolic Bone Diseases
  • Pituitary Diseases
  • Thyroid Diseases

Education & Awards

Dr. Blackman graduated from UMDNJ Robert Wood Johnson, Piscataway. He has 2 awards.

NCQA Diabetes Physician Recognition Program (2014 - 2017)
Top 10 Doctor - City (2014)
Columbus, OH


Dr. Blackman has 6 hospital affiliations:

  • Riverside Methodist Hospital 
  • Grant Medical Center 

> > > > Dr. John Blackman, MD

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Additional Information
Dr. John David Blackman MD is a male Internist, has 27 years of experience and practices in Internal Medicine.
Where does Dr. John D. Blackman practice?
Dr. John Blackman has 3 office locations.
Dr. John Blackman practices Internal Medicine near Columbus, OH.
See Columbus Internists.