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

Peter Nicholas Mahr, MD

Individual provider Family Medicine Physician · NPI 1548312754

Peter Nicholas Mahr, MD is registered under Family Practice in Portland, Oregon. Graduated from Geisel School of Medicine at Dartmouth in 1998, 28 years ago. Practices with Multnomah County, a 111-clinician group and accepts Medicare assignment. Licensed in Oregon.

Years since qualifying
28
Trained at
Geisel School of Medicine at Dartmouth
Licensed in
OR
In the registry since
2007
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

426 SW Stark St 8th Fl
Portland, OR 97204-2347 Not confirmed with CMS for 16 years — call before visiting
Phone: (503) 988-3674
Fax: (503) 988-5185
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Family Medicine Physician (primary) Taxonomy 207Q00000X · Licence MC21928 (OR)

Record details

NPI number1548312754
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorNo
NPI enumeratedJanuary 17, 2007
Last updated in NPPESDecember 18, 2009

Medicare enrollment

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

Medicare specialtyFAMILY PRACTICE
Medical schoolGEISEL SCHOOL OF MEDICINE AT DARTMOUTH
Graduated 1998 (28 years in practice)
Group practice Multnomah County — 111 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount

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 patients15
Services billed 27 a service is one billed item, such as a visit, a test or a procedure
Average patient age71

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.

Colleagues at Multnomah County

Clinicians the CMS Doctors & Clinicians file lists under the same group practice. CMS counts 111 clinicians in the practice; 12 are shown here.

Other providers in Portland