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

Dr. Carl Jeffries Mason, MD

Individual provider Internal Medicine Physician · NPI 1184787525

Dr. Carl Jeffries Mason, MD is an Internal Medicine Physician in Seattle, Washington. Licensed in Pennsylvania. Registered with an NPI since 2006.

Licensed in
PA
In the registry since
2006
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

24 Roy St Ste 120
Seattle, WA 98109-4018
Phone: (805) 455-8593
Fax: (805) 435-1509
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 MD038142E (PA)
Public Health & General Preventive Medicine Physician Taxonomy 2083P0901X · Licence MD038142E (PA)

Record details

NPI number1184787525
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorNo
NPI enumeratedDecember 18, 2006
Last updated in NPPESSeptember 25, 2014

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