Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of October 4, 2026.
NPIDirectory

Marshall A Corson

Individual provider Cardiovascular Disease Physician · NPI 1548346349

Marshall A Corson is registered under Cardiovascular Disease (Cardiology) in Seattle, Washington. Graduated from Baylor College of Medicine in 1981, 45 years ago. Practices with Whidbey Island Public Hospital District, a 99-clinician group and accepts Medicare assignment. Licensed in Washington.

Years since qualifying
45
Trained at
Baylor College of Medicine
Licensed in
WA
In the registry since
2006
Specialties on file
2
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Practice location Partly verified

Some contact details are missing from the federal record.

Harborview Medical Center 325 9th Ave
Seattle, WA 98104-9747 Not confirmed with CMS for 15 years — call before visiting
Phone: (206) 731-3475
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Interventional Cardiology Physician (primary) Taxonomy 207RI0011X · Licence MD00031838 (WA)
Cardiovascular Disease Physician Taxonomy 207RC0000X · Licence MD00031838 (WA)

Record details

NPI number1548346349
Entity typeIndividual (Type 1)
GenderMale
Sole proprietorNo
NPI enumeratedOctober 27, 2006
Last updated in NPPESApril 27, 2011

Medicare enrollment

From the CMS Doctors & Clinicians file — this clinician is enrolled in Medicare.

Medicare specialtyCARDIOVASCULAR DISEASE (CARDIOLOGY)
Medical schoolBAYLOR COLLEGE OF MEDICINE
Graduated 1981 (45 years in practice)
Group practice Whidbey Island Public Hospital District — 99 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount
Practice locations2 on file with Medicare

Medicare patients and services, 2024

From the CMS Medicare Physician & Other Practitioners file for calendar year 2024. It counts Original Medicare patients only, so a practice that mostly sees Medicare Advantage or privately insured patients looks smaller here than it is.

Medicare patients18
Services billed 18 a service is one billed item, such as a visit, a test or a procedure
Average patient age73

Dollar amounts are not shown. What Medicare pays a practice is gross billings, before staff, premises and tax and including the cost of any drugs it administers, so it is not what a clinician earns.

Colleagues at Whidbey Island Public Hospital District

Clinicians the CMS Doctors & Clinicians file lists under the same group practice. CMS counts 99 clinicians in the practice; 12 are shown here.

Other providers in Seattle