Robert J. Ziemer, PA-C
Physician Assistant · Seattle, WA
Robert J. Ziemer, PA-C is a physician assistant with a practice address in Seattle, Washington, and NPI 1083679245, issued on Apr 19, 2006. Check the license (Washington PA10004411, as entered in NPPES) with the Washington board that licenses this profession; the Medicare figures below come from public CMS files.
- Name
- Robert J. Ziemer
- Credential
- PA-C
- Primary taxonomy
- Physician Assistant 363A00000X
- License number
- PA10004411 WA
Self-reported in NPPES; status is on the state search - Practice location
- 325 9TH Ave, Seattle, WA 98104
- Phone
- (206) 520-5000
- Enumerated
- Apr 19, 2006
- Record last updated
- Sep 4, 2025
- Medicaid ID
- 8331761 WA
- Medicare enrollment
- Enrolled (PECOS I20100709000335); accepts Medicare assignment
- Entity
- Type 1 · individual
8 nearest physician assistant records → All 3,718 in Washington → Look up another NPI →
Also registered at 325 9TH Ave
A shared address usually means a shared clinic or building; it does not show who employs whom.
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- Martin Abdo, COUNSELORCounselor1821202904
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Verify Robert J. Ziemer in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWhich Washington board licenses this profession
Search for license PA10004411Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
83% fewer Medicare Part D claims than the average physician assistant in 2024
140 Medicare Part D claims for 96 beneficiaries, against an average of 830 among the 101,058 providers of this specialty who prescribed in Part D. 25 claims were for opioids.
Most prescribed
- Hydrocodone-Acetaminophen23 claims
- Cephalexin17 claims
- Doxycycline Hyclate11 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.
The practice group's MIPS final score for 2023 (Medicare payment program): 100 of 100
The Merit-based Incentive Payment System score is reported for the practice group, not for one clinician alone. Four categories are weighted into the final score; the average among 454,083 clinicians with a measured score was 83.5.
Source: CMS Quality Payment Program, MIPS performance year 2023, group reporting; category weights for 2023 (qpp.cms.gov).
Bills Medicare through one group practice
- The Association OF University PhysiciansSeattle, WA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Robert J. Ziemer among 3,718 physician assistant records in Washington
Robert J. Ziemer, PA-C is one of 3,718 physician assistant records with a practice address in Washington. 76% 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 3% of them.
- NPI issued2006 · 3% of these records are older, 80% newer
- In a Medicare fileYes · 76% of these records are
- In the CMS Doctors and Clinicians fileYes · 66% of these records are
- Graduated2002 · median 2017 among the 2,460 with a school on file
- Record last updated2025 · 48% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 363A00000X and a Washington practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
828 physician assistant records list a practice address in Seattle
They are 828 of the 41,956 NPPES records with a practice address in Seattle, and 3,718 physician assistant records in Washington.
All 3,718 in Washington → Every provider in Seattle → Physician Assistant nationwide →
The 8 physician assistant records with the nearest ZIP codes
- Virginia Arvold, PA-CSeattle, WA 981041487687000
- Andrea Breuner, PA-CSeattle, WA 981041730172586
- Cynthia Broome, PACSeattle, WA 981041316919301
- Margaret Duffy, P.A. - CSeattle, WA 981041154366391
- Lisa Harstedt, PASeattle, WA 981041730132390
- Mitzi Mae Lim, PACSeattle, WA 981041760589014
- Lourdes Limbo, P.A.Seattle, WA 981041053429597
- Yuko Miller, PA-CSeattle, WA 981041053423590
Common questions
What is Robert J. Ziemer, PA-C's NPI number?
Robert J. Ziemer, PA-C's National Provider Identifier (NPI) is 1083679245, issued on Apr 19, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Robert J. Ziemer, PA-C located?
The NPPES record lists a practice address at 325 9TH Ave, Seattle, WA, 98104. Phone: (206) 520-5000. Providers update this record themselves, so call before visiting.
How can I verify Robert J. Ziemer, PA-C's license?
NPPES lists Washington license number PA10004411, as entered by the provider. Search the Washington board that licenses this profession; the NPPES record confirms identity only.
How much does Robert J. Ziemer, PA-C prescribe under Medicare Part D?
In 2024, Robert J. Ziemer, PA-C had 140 Medicare Part D claims for 96 beneficiaries; the average among physician assistant prescribers was 830. Part D covers Medicare prescriptions only.
What is Robert J. Ziemer, PA-C's MIPS final score?
The 2023 MIPS final score is 100 of 100, reported for the practice group. The average among 454,083 clinicians with a measured score was 83.5.
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.