David Mason Siebert
Family Medicine Physician · Seattle, WA
David Mason Siebert is a family medicine physician with a practice address in Seattle, Washington, and NPI 1174866354, issued on Apr 5, 2013. Check the license (Washington MD60584255, as entered in NPPES) on the Washington Medical Commission; the Medicare figures below come from public CMS files.
- Name
- David Mason Siebert
- Primary taxonomy
- Family Medicine Physician 207Q00000X
- License number
- MD60584255 WA
Self-reported in NPPES; status is on the state search - Practice location
- 3800 Montlake Blvd NE, Seattle, WA 98195
- Phone
- (206) 598-3294
- Enumerated
- Apr 5, 2013
- Record last updated
- Aug 7, 2020 (not updated in 6 years: call before relying on the address or phone)
- Medicaid ID
- 1174866354 WA
- Medicare enrollment
- Enrolled (PECOS I20170710001023); accepts Medicare assignment
- Medical or professional school
- University Of Chicago, Pritzker School Of Medicine, 2013
- Entity
- Type 1 · individual
8 nearest family medicine physician records → All 5,534 in Washington → Look up another NPI →
Also registered at 3800 Montlake Blvd NE
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Randall Gladwish, PTPhysical Therapist1427259464
- Jawea May, PTAPhysical Therapy Assistant1427449958
- Phanith Touch, MDPediatrics Physician1275111635
Verify David Mason Siebert in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWashington Medical Commission
Search for license MD60584255Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
93% fewer Medicare Part D claims than the average family medicine physician in 2024
251 Medicare Part D claims for 51 beneficiaries, against an average of 3,544 among the 117,163 providers of this specialty who prescribed in Part D.
Most prescribed
- Lisinopril20 claims
- Atorvastatin Calcium16 claims
- Gabapentin14 claims
- Tamsulosin Hcl14 claims
- Levothyroxine Sodium12 claims
- Rosuvastatin Calcium12 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 MIPS final score for 2023 (Medicare payment program): 93.1 of 100
The Merit-based Incentive Payment System score is reported for this clinician. 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; category weights for 2023 (qpp.cms.gov).
Bills Medicare through 3 group practices
- Select Outpatient Services IncGlenview, IL
- Select Rehabilitation, LLCGlenview, IL
- 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).
David Mason Siebert among 5,534 family medicine physician records in Washington
David Mason Siebert is one of 5,534 family medicine physician records with a practice address in Washington. 73% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2013, is newer than 67% of them.
- NPI issued2013 · 67% of these records are older, 30% newer
- In a Medicare fileYes · 73% of these records are
- In the CMS Doctors and Clinicians fileYes · 60% of these records are
- Graduated2013 · median 2009 among the 3,294 with a school on file
- Record last updated2020 · 57% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207Q00000X and a Washington practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
871 family medicine physician records list a practice address in Seattle
They are 871 of the 41,956 NPPES records with a practice address in Seattle, and 5,534 family medicine physician records in Washington.
All 5,534 in Washington → Every provider in Seattle → Family Medicine Physician nationwide →
The 8 family medicine physician records with the nearest ZIP codes
- Alfred BergSeattle, WA 981951225128184
- Todd Bouchard, MDSeattle, WA 981951942246418
- Christopher Chan, MDSeattle, WA 981951972591873
- Michael EshlemanSeattle, WA 981951043300908
- Evelyn Fang, MDSeattle, WA 981951528176781
- Betsy Fine, MDSeattle, WA 981951407870413
- Charissa Fotinos, MDSeattle, WA 981951285640078
- Steven Kewish, M.D.Seattle, WA 981951790756849
Common questions
What is David Mason Siebert's NPI number?
David Mason Siebert's National Provider Identifier (NPI) is 1174866354, issued on Apr 5, 2013. An NPI identifies a provider in billing; it is not a license.
Where is David Mason Siebert located?
The NPPES record lists a practice address at 3800 Montlake Blvd NE, Seattle, WA, 98195. Phone: (206) 598-3294. Providers update this record themselves, so call before visiting.
How can I verify David Mason Siebert's license?
NPPES lists Washington license number MD60584255, 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 David Mason Siebert prescribe under Medicare Part D?
In 2024, David Mason Siebert had 251 Medicare Part D claims for 51 beneficiaries; the average among family medicine physician prescribers was 3,544. Part D covers Medicare prescriptions only.
What is David Mason Siebert's MIPS final score?
The 2023 MIPS final score is 93.1 of 100. 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.