Zachary Charles Mattes, M.D.
Hospitalist Physician · Seattle, WA
Zachary Charles Mattes, M.D. is a hospitalist physician with a practice address in Seattle, Washington, and NPI 1841644432, issued on Apr 20, 2016. Check the license (Washington MD60974864, as entered in NPPES) on the Washington Medical Commission; the Medicare figures below come from public CMS files.
- Name
- Zachary Charles Mattes
- Credential
- M.D.
- Primary taxonomy
- Hospitalist Physician 208M00000X
- License number
- MD60974864 WA
Self-reported in NPPES; status is on the state search - Practice location
- 1101 Madison St Ste 301, Seattle, WA 98104
- Phone
- (206) 505-1300
- Enumerated
- Apr 20, 2016
- Record last updated
- Jun 17, 2021 (not updated in 5 years: call before relying on the address or phone)
- Medicare enrollment
- Enrolled (PECOS I20201201002656); accepts Medicare assignment
- Medical or professional school
- Saint Louis University School Of Medicine, 2016
- Entity
- Type 1 · individual
Also registered at 1101 Madison St Ste 301
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Ashlan Applegate, PA-CPhysician Assistant1962025940
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- John Brooling, MDGastroenterology Physician1487944666
- Rex Cheng, M.D.Gastroenterology Physician1689998874
- Alice Chu, MDUrology Physician1356974208
- Jason Daly, LCSWSocial Worker1174819262
Verify Zachary Charles Mattes in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWashington Medical Commission
Search for license MD60974864Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
59% fewer Medicare Part D claims than the average hospitalist physician in 2024
212 Medicare Part D claims for 78 beneficiaries, against an average of 521 among the 21,613 providers of this specialty who prescribed in Part D. 12 claims were for opioids.
Most prescribed
- Metoprolol Succinate21 claims
- Clopidogrel12 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 one group practice
- Franciscan Medical GroupTacoma, WA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Hospitalist Physician providers in Washington
There are 793 hospitalist physician records in Washington.
Other hospitalist physician records in Washington
- Fnu Aakash, MDRichland, WA1124713771
- Barry Aaronson, MDSeattle, WA1952418345
- Kathleen Abbasi, D.O.Vancouver, WA1215137450
- Collette AbbottSeattle, WA1306208293
- Jesse Abbott Klafter, M.D.Renton, WA1225394935
- Ryan Abe, MDSeattle, WA1548766884
- Bushra Abid, MDSeattle, WA1659534469
- Wesley Ablemona, M.D.Richland, WA1881004521
- Andrew AbovianWenatchee, WA1669909107
- Rachel Abramson, MDSeattle, WA1396449187
Common questions
What is Zachary Charles Mattes, M.D.'s NPI number?
Zachary Charles Mattes, M.D.'s National Provider Identifier (NPI) is 1841644432, issued on Apr 20, 2016. An NPI identifies a provider in billing; it is not a license.
Where is Zachary Charles Mattes, M.D. located?
The NPPES record lists a practice address at 1101 Madison St Ste 301, Seattle, WA, 98104. Phone: (206) 505-1300. Providers update this record themselves, so call before visiting.
How can I verify Zachary Charles Mattes, M.D.'s license?
NPPES lists Washington license number MD60974864, 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 Zachary Charles Mattes, M.D. prescribe under Medicare Part D?
In 2024, Zachary Charles Mattes, M.D. had 212 Medicare Part D claims for 78 beneficiaries; the average among hospitalist physician prescribers was 521. 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.