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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 (2)

The overall average patient rating of Dr. Ann Mass is Good. Dr. Mass has been reviewed by 10 patients who have provided 2 comments. The rating is 3.5 out of 5 stars.

Patient Ratings
Ease of Appointment 3.6
Promptness 4.3
Courteous Staff 3.7
Accurate Diagnosis 4.0
Bedside Manner 4.6
Spends Time with Me 4.8
Follows Up After Visit 4.0

Specialties & Research

Dr. Ann Mass, MD is board certified in Internal Medicine.

  • She has special expertise in 3 areas:
  • Critical Care
  • Osteoporosis
  • Women's Health

Education & Awards

Dr. Mass graduated from Harvard University , Boston. She has 2 awards.

Castle Connolly's Top Doctors™ (2013)
On-Time Doctor Award (2015)


Dr. Mass has 1 hospital affiliations:

  • Aspen Valley Hospital 


  • French
  • Spanish

> > > > Dr. Ann Mass, MD

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Additional Information
Dr. Ann May Mass MD is a female Internist, has 39 years of experience and practices in Internal Medicine.
Where does Dr. Ann M. Mass practice?
Dr. Ann Mass has 1 office location.
Dr. Ann Mass practices Internal Medicine near Aspen, CO.
See Aspen Internists.