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

Dr. John Hamilton Addison, MD

Individual provider Internal Medicine Physician · NPI 1659323087

Dr. John Hamilton Addison, MD is an Internal Medicine in Mercer Island, Washington. Graduated from University of Washington School of Medicine in 1979, 47 years ago. Practices with Legacy Healthcare Services Inc, a 3,624-clinician group, works from 3 locations, accepts Medicare assignment and offers telehealth. Licensed in Colorado and Washington.

Years since qualifying
47
Trained at
University of Washington School of Medicine
Licensed in
CO, WA
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.

See every abbreviation used in this directory →

Practice location Address checks out

9725 SE 36th St Ste 214
Mercer Island, WA 98040-3840
Phone: (206) 275-3588
Fax: (206) 275-2073
Show map & directions

Pin is approximate — placed at the ZIP-code centre, not the exact door.

Additional practice locations (2)

  • 5495 Arapahoe Ave Ste 100g, Boulder, CO 80303-1224 — (303) 415-4246
  • 2101 Ken Pratt Blvd Ste 104g, Longmont, CO 80501-6568 — (303) 415-4246

Specialties & licences

Geriatric Medicine (Internal Medicine) Physician (primary) Taxonomy 207RG0300X · Licence MD00018359 (WA)
Internal Medicine Physician Taxonomy 207R00000X · Licence DR.0072381 (CO)

Record details

NPI number1659323087
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorYes
NPI enumeratedMay 16, 2006
Last updated in NPPESSeptember 27, 2024
Certification dateSeptember 27, 2024
Mailing addressPo Box 1526, Mercer Island, WA 98040-1526

Medicare enrollment

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

Medicare specialtyINTERNAL MEDICINE
Medical schoolUNIVERSITY OF WASHINGTON SCHOOL OF MEDICINE
Graduated 1979 (47 years in practice)
Group practice Legacy Healthcare Services Inc — 3624 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount
TelehealthOffers telehealth services
Practice locations3 on file with Medicare

Other providers in Mercer Island