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

William Robb Maclellan, MD

Individual provider Cardiovascular Disease Physician · NPI 1427077320

William Robb Maclellan, MD is registered under Cardiovascular Disease (Cardiology) in Seattle, Washington. Qualified in 1988, 38 years ago. Practices with The Association of University Physicians, a 3,459-clinician group, accepts Medicare assignment and offers telehealth. Licensed in California.

Years since qualifying
38
Licensed in
CA
In the registry since
2006
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

1959 NE Pacific St Box 356422
Seattle, WA 98195-6422 Not confirmed with CMS for 13 years — call before visiting
Phone: (206) 616-1040
Fax: (206) 616-4847
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Cardiovascular Disease Physician (primary) Taxonomy 207RC0000X · Licence G84856 (CA)

Record details

NPI number1427077320
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorNo
NPI enumeratedJuly 19, 2006
Last updated in NPPESApril 22, 2013

Medicare enrollment

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

Medicare specialtyCARDIOVASCULAR DISEASE (CARDIOLOGY)
Medical schoolOTHER
Graduated 1988 (38 years in practice)
Group practice The Association Of University Physicians — 3459 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount
TelehealthOffers telehealth services

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 patients870
Services billed 1,318 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.

Practises at

Facilities the CMS Facility Affiliation file lists for this clinician. Those with a page here are linked.

Also affiliated with 1 hospital, which CMS identifies by certification number only.

Colleagues at The Association of University Physicians

Clinicians the CMS Doctors & Clinicians file lists under the same group practice. CMS counts 3459 clinicians in the practice; 12 are shown here.

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