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

Peter Bosak, MD

Individual provider Internal Medicine Physician · NPI 1811912892

Peter Bosak, MD practises Internal Medicine in Auburn, Washington. Qualified in 1991, 35 years ago. Practices with Multicare Health System, a 2,302-clinician group, accepts Medicare assignment and offers telehealth. Licensed in Washington.

Years since qualifying
35
Licensed in
WA
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

202 N Division St
Auburn, WA 98001-4939 Not confirmed with CMS for 16 years — call before visiting
Phone: (253) 876-7997
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Internal Medicine Physician (primary) Taxonomy 207R00000X · Licence MD00045839 (WA)

Record details

NPI number1811912892
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorNo
NPI enumeratedJuly 12, 2006
Last updated in NPPESSeptember 8, 2010

Medicare enrollment

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

Medicare specialtyINTERNAL MEDICINE
Medical schoolOTHER
Graduated 1991 (35 years in practice)
Group practice Multicare Health System — 2302 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount
TelehealthOffers telehealth services
Practice locations4 on file with Medicare

Procedures

From CMS Care Compare, which counts the procedures a clinician billed to Original Medicare and Medicare Advantage over a recent 12-month period. CMS reports a fixed list of common procedures, so this is not everything the clinician does. Counts of 10 or fewer are given as a range, because CMS withholds small numbers.

Removal of skin lesions 15 times · 62nd percentile

The percentile compares how often this clinician performed the procedure with other clinicians who performed it, as CMS calculates it. It measures volume, not outcomes or skill.

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 patients280
Services billed 895 a service is one billed item, such as a visit, a test or a procedure
Average patient age77

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.

  • Multicare Good Samaritan Hospital Hospital · Puyallup, WA · listed as Good Samaritan Hospital
  • St Joseph Medical Center Hospital · Tacoma, WA
  • Wesley Homes At Home, Llc Home health agency · Des Moines, WA · listed as Wesley Homes Hospice, LLC
  • Multicare Auburn Medical Center Hospital · Auburn, WA
  • Multicare Covington Medical Center Hospital · Covington, WA
  • Tacoma General Allenmore Hospital Hospital · Tacoma, WA
  • Puget Sound Home Health Of King County Home health agency · Tacoma, WA

Colleagues at Multicare Health System

Clinicians the CMS Doctors & Clinicians file lists under the same group practice. CMS counts 2302 clinicians in the practice; 12 are shown here.

Other providers in Auburn