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DR. CARL JEFFRIES MASON M.D.
NPI 1184787525
Internal Medicine in Seattle, WA

Active since December 18, 2006
24 ROY ST, SUITE 120, SEATTLE, WA 98109(805) 455-8593(805) 435-1509 Get Directions Write a Review

NPPES record last updated: September 25, 2014. Verified against the NPPES registry weekly; last sync: August 16, 2026.

About Dr. Carl Jeffries Mason M.d. NPPES

Official registry information on file with the National Plan and Provider Enumeration System.

DR. CARL JEFFRIES MASON M.D. (NPI 1184787525) is an individual internal medicine provider in Seattle, Washington, licensed in Pennsylvania (MD038142E) and active in the NPI registry since December 2006.

NPPES Registry Identity

NPI1184787525
Entity TypeIndividualMale
Primary Taxonomy207R00000X
Provider Legal NameDR. CARL JEFFRIES MASONCredential: M.D.
Location Address24 ROY ST, SUITE 120Seattle, WA 98109-4018
Mailing Address24 Roy St, Suite 120Seattle, WA 98109-4018 · (805) 455-8593 · Fax (805) 435-1509
Phone(805) 455-8593
Fax(805) 435-1509
Sole ProprietorNo
Enumeration DateDecember 18, 2006
Last NPPES UpdateSeptember 25, 2014
✔ NPI 1184787525 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses 2

★ Primary SpecialtyInternal MedicineAllopathic & Osteopathic Physicians
Taxonomy Code207R00000X
License✔ Licensed in PA · MD038142E
Definition
A physician who provides long-term, comprehensive care in the office and the hospital, managing both common and complex illness of adolescents, adults and the elderly. Internists are trained in the diagnosis and treatment of cancer, infections and diseases affecting the heart, blood, kidneys, joints and digestive, respiratory and vascular systems. They are also trained in the essentials of primary care internal medicine, which incorporates an understanding of disease prevention, wellness, substance abuse, mental health and effective treatment of common problems of the eyes, ears, skin, nervous system and reproductive organs.
Also ListedPreventive Medicine · Public Health & General Preventive MedicineTaxonomy 2083P0901X · License MD038142E (PA)
24 ROY ST, Seattle, WA 98109
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Other Providers at the Same Location NPPES 5

Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.

MS. KATHLEEN LAINO M.S., BCBA
Behavior Analyst
24 ROY ST
SEATTLE, WA 98109
King County (206) 919-3225
MISS VALORI BERENDS M.S., BCBA
Behavior Analyst
24 ROY ST, 434
SEATTLE, WA 98109
King County (206) 905-4660
MRS. HIBAQ AHMED SUDI GULED M.ED
Behavior Analyst
24 ROY ST, #434
SEATTLE, WA 98109
King County (206) 384-4142
IISHA GWYNN
Behavior Analyst
24 ROY ST, #434
SEATTLE, WA 98109
King County (206) 384-4142
MISS LACY M CHEERS
Behavior Analyst
24 ROY ST, #434
SEATTLE, WA 98109
King County (206) 384-4142

Frequently Asked Questions NPPES & CMS

Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.

What is Carl Mason's NPI number?

The NPI number for Carl Mason is 1184787525. It was assigned to this individual provider in the NPPES registry on December 18, 2006.

Where is Carl Mason located?

Carl Mason practices at 24 Roy St Suite 120, Seattle, WA 98109. The listed phone number is (805) 455-8593.

What is Carl Mason's specialty?

The primary specialty registered for this NPI is Internal Medicine with taxonomy code 207R00000X.

When was this NPI record last updated?

The NPPES record for Carl Mason was last updated on September 25, 2014. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 11 years ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.