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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. William Pachas is Good. Dr. Pachas has been reviewed by 12 patients who have provided 3 comments. The rating is 4 out of 5 stars.

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

Specialties & Research

Dr. William Pachas, MD is board certified in Internal Medicine.

Education & Awards

Dr. Pachas graduated from Universidad Nacional Mayor De San Marcos, Lima.


Dr. Pachas has 6 hospital affiliations:

  • Massachusetts General Hospital 
  • Marlborough Hospital 


  • Spanish
  • English

> > > > Dr. William Pachas, MD

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Additional Information
Dr. William Pachas MD is a male Internist and practices in Internal Medicine.
Where does Dr. William Pachas practice?
Dr. William Pachas has 3 office locations.
Dr. William Pachas practices Internal Medicine near Winchester, MA.
Additional practice locations include: Boston, MA and Marlborough, MA.
See Winchester Internists.