Internist, Oncology Specialist (cancer)
38 years of experience
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 (14)

The overall average patient rating of Dr. Karen Ratner is Below Average. Dr. Ratner has been reviewed by 16 patients who have provided 14 comments. The rating is 2 out of 5 stars.

Patient Ratings
Ease of Appointment 2.3
Promptness 1.3
Courteous Staff 2.1
Accurate Diagnosis 2.3
Bedside Manner 2.3
Spends Time with Me 2.3
Follows Up After Visit 1.3

Specialties & Research

Dr. Karen Ratner, MD is board certified in Internal Medicine and Medical Oncology.

  • She has special expertise in 1 area:
  • Cancer

Education & Awards

Dr. Ratner graduated from University of California at San Francisco. She has 2 awards.

Bridges to Excellence Recognition
Bridges to Excellence Medical Home Recognition (2014 - 2017)
Level III
NCQA Physician Practice Connections - Patient Centered Medical Home (2014 - 2017)


Dr. Ratner has 14 hospital affiliations:

  • Sky Ridge Medical Center 
  • Centura Health Littleton Adventist Hospital 

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Additional Information
Dr. Karen Nora Ratner MD is a female Internist, has 38 years of experience and practices in Internal Medicine and Medical Oncology.
Where does Dr. Karen N. Ratner practice?
Dr. Karen Ratner has 1 office location.
Dr. Karen Ratner practices Internal Medicine and Medical Oncology near Littleton, CO.
See Littleton Internists and Littleton Oncologists.