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

John Michael Holland, MD

Individual provider Radiation Oncology Physician · NPI 1104834662

John Michael Holland, MD is a Radiation Oncology in Portland, Oregon. Graduated from Washington University School of Medicine in 1989, 37 years ago. Practices with Portland Adventist Medical Center, a 272-clinician group, works from 2 locations and accepts Medicare assignment. Licensed in Oregon.

Years since qualifying
37
Trained at
Washington University School of Medicine
Licensed in
OR
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

3181 SW Sam Jackson Park Rd KPV4
Portland, OR 97239-3011
Phone: (503) 494-8756
Show map & directions

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

Additional practice locations (1)

  • 1775 Thompson Rd, Coos Bay, OR 97420-2198 — (541) 269-8111

Specialties & licences

Radiation Oncology Physician (primary) Taxonomy 2085R0001X · Licence MD19074 (OR)

Record details

NPI number1104834662
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorNo
NPI enumeratedAugust 3, 2006
Last updated in NPPESSeptember 30, 2020
Certification dateSeptember 30, 2020

Medicare enrollment

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

Medicare specialtyRADIATION ONCOLOGY
Medical schoolWASHINGTON UNIVERSITY SCHOOL OF MEDICINE
Graduated 1989 (37 years in practice)
Group practice Portland Adventist Medical Center — 272 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount

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