Margaret Mass, MD
Family Medicine Physician · Everett, WA
Margaret Mass, MD is a family medicine physician with a practice address in Everett, Washington, and NPI 1083343107, issued on Jun 6, 2022. Check the license (Washington MD70026676, as entered in NPPES) on the Washington Medical Commission; the Medicare figures below come from public CMS files.
- Name
- Margaret Mass
- Credential
- MD
- Primary taxonomy
- Family Medicine Physician 207Q00000X
- License number
- MD70026676 WA
Self-reported in NPPES; status is on the state search - Practice location
- 3901 Hoyt Ave, Everett, WA 98201
- Phone
- (425) 303-3091
- Enumerated
- Jun 6, 2022
- Record last updated
- Jul 20, 2026
- Medicare enrollment
- Enrolled (PECOS I20251001000186); accepts Medicare assignment
- Medical or professional school
- University Of Illinois College Of Med (Chi/Peor/Rock/Chm-Urb), 2022
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest family medicine physician records → All 5,534 in Washington → Look up another NPI →
Also registered at 3901 Hoyt Ave
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify Margaret Mass in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWashington Medical Commission
Search for license MD70026676Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
99% fewer Medicare Part D claims than the average family medicine physician in 2024
26 Medicare Part D claims, against an average of 3,544 among the 117,163 providers of this specialty who prescribed in Part D.
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.
Industry payments in 2024: $66.10
3 payments; by number, the most common kind was food and beverage; the largest payer was Kiniksa Pharmaceuticals International, plc. The 55,478 providers of this specialty with any payment received $902.55 on average. Payments are reported by manufacturers, not by the provider, and are not a sign of wrongdoing.
Source: CMS Open Payments, program year 2024 (openpaymentsdata.cms.gov); average among providers of this specialty with at least one payment.
Bills Medicare through one group practice
- The Polyclinic PLLCSeattle, WA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Margaret Mass among 5,534 family medicine physician records in Washington
Margaret Mass, MD 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 2022, is newer than 94% of them.
- NPI issued2022 · 94% of these records are older, 3% newer
- In a Medicare fileYes · 73% of these records are
- In the CMS Doctors and Clinicians fileYes · 60% of these records are
- Graduated2022 · median 2009 among the 3,294 with a school on file
- Record last updated2026 · 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).
195 family medicine physician records list a practice address in Everett
They are 195 of the 7,246 NPPES records with a practice address in Everett, and 5,534 family medicine physician records in Washington.
All 5,534 in Washington → Every provider in Everett → Family Medicine Physician nationwide →
The 8 family medicine physician records with the nearest ZIP codes
- Erik Bylund, MDEverett, WA 982011306833090
- Brett Daniel, M.D.Everett, WA 982011932198892
- Ellen Dejong, MDEverett, WA 982011639167638
- James Fasciano, M.D.Everett, WA 982011467427443
- Mark Flynn, MDEverett, WA 982011528059441
- Sean McLaughlin, M.D.Everett, WA 982011447252556
- Heather Morphy, M.D.Everett, WA 982011912908294
- Lisa Murphy, MDEverett, WA 982011265414049
Common questions
What is Margaret Mass, MD's NPI number?
Margaret Mass, MD's National Provider Identifier (NPI) is 1083343107, issued on Jun 6, 2022. An NPI identifies a provider in billing; it is not a license.
Where is Margaret Mass, MD located?
The NPPES record lists a practice address at 3901 Hoyt Ave, Everett, WA, 98201. Phone: (425) 303-3091. Providers update this record themselves, so call before visiting.
How can I verify Margaret Mass, MD's license?
NPPES lists Washington license number MD70026676, 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 Margaret Mass, MD prescribe under Medicare Part D?
In 2024, Margaret Mass, MD had 26 Medicare Part D claims; the average among family medicine physician prescribers was 3,544. 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.