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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 (3)

The overall average patient rating of Dr. Ruben Sierra is Excellent. Dr. Sierra has been reviewed by 10 patients who have provided 3 comments. The rating is 4.5 out of 5 stars.

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

Specialties & Research

Dr. Ruben Sierra, MD is board certified in Internal Medicine and Medical Oncology.

  • He has special expertise in 1 area:
  • Cancer

Education & Awards

Dr. Sierra graduated from University of Puerto Rico, San Juan. He has 3 awards.

Patients' Choice 5th Anniversary Award (2012)
Patients' Choice Award (2008 - 2012)
Compassionate Doctor Recognition (2010, 2012)


Dr. Sierra has 3 hospital affiliations:

  • Kadlec Regional Medical Center 
  • Kennewick General Hospital 
  • Our Lady of Lourdes Hospital 


  • Spanish

> > > > Dr. Ruben Sierra, MD

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Additional Information
Dr. Ruben Daniel Sierra MD is a male Internist, has 34 years of experience and practices in Internal Medicine and Medical Oncology.
Where does Dr. Ruben D. Sierra practice?
Dr. Ruben Sierra has 2 office locations.
Dr. Ruben Sierra practices Internal Medicine and Medical Oncology near Kennewick, WA.
Additional practice locations include: Ormond Beach, FL.
See Kennewick Internists and Kennewick Oncologists.