Recently Updated NPI Information — some details in this NPI profile have been updated in the NPI registry within the last 60 days.

JOHN H VASSALL II MD
NPI 1619964103
Internal Medicine in Seattle, WA

Active since September 30, 2005
515 MINOR AVE, SUITE 300, SEATTLE, WA 98104(206) 386-9500(206) 386-9605 Get Directions Write a Review

NPPES record last updated: July 13, 2026. Verified against the NPPES registry weekly; last sync: August 09, 2026.

About John H Vassall Ii Md NPPES

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

JOHN H VASSALL II MD (NPI 1619964103) is an individual internal medicine provider in Seattle, Washington, licensed in Washington (MD00019787) and active in the NPI registry since September 2005.

NPPES Registry Identity

NPI1619964103
Entity TypeIndividualMale
Primary Taxonomy207R00000X
Provider Legal NameJOHN H VASSALL IICredential: MD
Location Address515 MINOR AVE, SUITE 300Seattle, WA 98104-2120
Mailing AddressPo Box 3489Seattle, WA 98114-3489 · (206) 386-9500 · Fax (206) 386-9605
Fax(206) 386-9605
Sole ProprietorNo
Enumeration DateSeptember 30, 2005
Last NPPES UpdateJuly 13, 2026
NPI 1619964103 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

Primary SpecialtyInternal MedicineAllopathic & Osteopathic Physicians
Taxonomy Code207R00000X
License Licensed in WA · MD00019787
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.
515 MINOR AVE, Seattle, WA 98104

Other Identifiers 2

Other78924WA · L & I
Medicaid1066802WA

Other Providers at the Same Location NPPES 20

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

Internal Medicine
515 MINOR AVE
SEATTLE, WA 98104
Urology
515 MINOR AVE, SUITE 200
SEATTLE, WA 98104
Internal Medicine
515 MINOR AVE, SUITE 300
SEATTLE, WA 98104
Urology
515 MINOR AVE, SUITE 200
SEATTLE, WA 98104
Physical Therapist
515 MINOR AVE, SUITE 22
SEATTLE, WA 98104
Physical Therapist
515 MINOR AVE, SUITE 22
SEATTLE, WA 98104
Physical Therapist
515 MINOR AVE, SUITE 22
SEATTLE, WA 98104
Podiatrist (Foot Surgery)
515 MINOR AVE, SUITE 240
SEATTLE, WA 98104

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 John Vassall's NPI number?

The NPI number for John Vassall is 1619964103. It was assigned to this individual provider in the NPPES registry on September 30, 2005.

Where is John Vassall located?

John Vassall practices at 515 Minor Ave Suite 300, Seattle, WA 98104. The listed phone number is (206) 386-9500.

What is John Vassall'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 John Vassall was last updated on July 13, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 30 days 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.