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

Dr. Mark R. Selby, DO

Individual provider Internal Medicine Physician · NPI 1265476782

Dr. Mark R. Selby, DO is an Internal Medicine Physician in Pittsfield, Massachusetts. Licensed in Massachusetts. Registered with an NPI since 2006.

Licensed in
MA
In the registry since
2006
What do these letters mean?
DO — Doctor of Osteopathic Medicine
A fully licensed physician, trained like an MD with additional musculoskeletal training. Equivalent practice rights in all 50 states.

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Practice location Address checks out

73 Eagle St
Pittsfield, MA 01201-4714
Phone: (413) 499-2672
Fax: (413) 447-8825
Show map & directions

Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Internal Medicine Physician (primary) Taxonomy 207R00000X · Licence MA43107 (MA)

Record details

NPI number1265476782
Entity typeIndividual (Type 1)
GenderMale
Credentials DO
Sole proprietorNo
NPI enumeratedJune 15, 2006
Last updated in NPPESJuly 13, 2026
Mailing addressPo Box 1007, Ashfield, MA 01330-1007

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