Peter Bosak, MD
Internal Medicine Physician · Auburn, WA
Peter Bosak, MD is an internal medicine physician with a practice address in Auburn, Washington, and NPI 1811912892, issued on Jul 12, 2006. Check the license (Washington MD00045839, as entered in NPPES) on the Washington Medical Commission; the Medicare figures below come from public CMS files.
- Name
- Peter Bosak
- Credential
- MD
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- MD00045839 WA
Self-reported in NPPES; status is on the state search - Practice location
- 202 N Division St, Auburn, WA 98001
- Phone
- (253) 876-7997
- Enumerated
- Jul 12, 2006
- Record last updated
- Sep 8, 2010 (not updated in 16 years: call before relying on the address or phone)
- Medicare enrollment
- Enrolled (PECOS I20060327000632); accepts Medicare assignment
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 3,079 in Washington → Look up another NPI →
Also registered at 202 N Division St
A shared address usually means a shared clinic or building; it does not show who employs whom.
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- Lisa Anujarerat, RNEmergency Registered Nurse1316750136
Verify Peter Bosak in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWashington Medical Commission
Search for license MD00045839Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
3.1 times the Medicare Part D claims of the average internal medicine physician in 2024
9,785 Medicare Part D claims for 664 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. Brand-name drugs were 8% of claims. 431 claims were for opioids.
Most prescribed
- Atorvastatin Calcium581 claims
- Lisinopril510 claims
- Amlodipine Besylate437 claims
- Losartan Potassium342 claims
- Levothyroxine Sodium298 claims
- Metformin Hcl294 claims
Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.
Bills Medicare through 3 group practices
- Multicare Health SystemAuburn, WA
- Select Outpatient Services IncGlenview, IL
- Select Rehabilitation, LLCGlenview, IL
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Peter Bosak among 3,079 internal medicine physician records in Washington
Peter Bosak, MD is one of 3,079 internal medicine physician records with a practice address in Washington. 75% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2006, is newer than 8% of them.
- NPI issued2006 · 8% of these records are older, 55% newer
- In a Medicare fileYes · 75% of these records are
- In the CMS Doctors and Clinicians fileYes · 60% of these records are
- Graduated1991 · median 2006 among the 1,852 with a school on file
- Record last updated2010 · 63% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207R00000X and a Washington practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Internal Medicine Physician providers in Washington
There are 3,079 internal medicine physician records in Washington.
All 3,079 in Washington → Every provider in Auburn → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- Stewart Birse, MDAuburn, WA 980011144245168
- Joseph GehrettAuburn, WA 980011225044167
- Barbara GehrettAuburn, WA 980011285640292
- Nadine Gettel, MDAuburn, WA 980011295848281
- Eduardo Gil De Rubio, MDAuburn, WA 980011023183522
- Bruce Gregg, MDAuburn, WA 980011659463222
- Madhavi Mandala, MDAuburn, WA 980011134232168
- Aftab Memon, MDAuburn, WA 980011942221882
Common questions
What is Peter Bosak, MD's NPI number?
Peter Bosak, MD's National Provider Identifier (NPI) is 1811912892, issued on Jul 12, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Peter Bosak, MD located?
The NPPES record lists a practice address at 202 N Division St, Auburn, WA, 98001. Phone: (253) 876-7997. Providers update this record themselves, so call before visiting.
How can I verify Peter Bosak, MD's license?
NPPES lists Washington license number MD00045839, as entered by the provider. Search the Washington Medical Commission at https://wahelms.my.site.com/s/license-search. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Peter Bosak, MD prescribe under Medicare Part D?
In 2024, Peter Bosak, MD had 9,785 Medicare Part D claims for 664 beneficiaries; the average among internal medicine physician prescribers was 3,176. Part D covers Medicare prescriptions only.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.