Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of August 10, 2026.
NPIDirectory

Dr. Ann M Mass, MD

Individual provider Specialist · NPI 1598769358

Dr. Ann M Mass, MD is a Specialist in Aspen, Colorado. Licensed in Colorado. Registered with an NPI since 2005.

Licensed in
CO
In the registry since
2005
Specialties on file
2
What do these letters mean?
MD — Doctor of Medicine
A physician who completed allopathic medical school.

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Practice location Address checks out

225 N Mill St Ste 116
Aspen, CO 81611-1958
Phone: (970) 544-1234
Fax: (970) 544-1310
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Internal Medicine Physician (primary) Taxonomy 207R00000X · Licence CO21624 (CO)
Specialist Taxonomy 174400000X · Licence 21624 (CO)

Record details

NPI number1598769358
Entity typeIndividual (Type 1)
GenderFemale
Credentials MD
Sole proprietorNo
NPI enumeratedJune 9, 2005
Last updated in NPPESJanuary 26, 2016
Mailing address225 N Mill St, Ste 116, Aspen, CO 81611-1958

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