Marci S. Yoss, MD
Family Medicine Physician · Northampton, MA
Marci S. Yoss, MD is a family medicine physician with a practice address in Northampton, Massachusetts, and NPI 1942215363, issued on Jul 31, 2006. Check the license (Massachusetts 54446, as entered in NPPES) on the Massachusetts Board of Registration in Medicine; the Medicare figures below come from public CMS files.
- Name
- Marci S. Yoss
- Credential
- MD
- Primary taxonomy
- Family Medicine Physician 207Q00000X
- License number
- 54446 MA
Self-reported in NPPES; status is on the state search - Practice location
- 325B King Street, Northampton, MA 01060
- Phone
- (413) 387-4100
- Enumerated
- Jul 31, 2006
- Record last updated
- Nov 14, 2016 (not updated in 10 years: call before relying on the address or phone)
- Fax
- (413) 387-4119
- Entity
- Type 1 · individual
8 nearest family medicine physician records → All 2,265 in Massachusetts → Look up another NPI →
Also registered at 325B King Street
A shared address usually means a shared clinic or building; it does not show who employs whom.
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- Grant Dawson, M.D.Family Medicine Physician1568648749
- Benjamin Duffy, NPFamily Nurse Practitioner1083487417
- Joyce Duncan, MDFamily Medicine Physician1770559296
- Marisela Fermin-Schon, MSN, FNP-CFamily Nurse Practitioner1568871325
- Adam Garretson, MDFamily Medicine Physician1912998915
Verify Marci S. Yoss in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMassachusetts Board of Registration in Medicine
Search for license 54446Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
98% fewer Medicare Part D claims than the average family medicine physician in 2024
80 Medicare Part D claims for 18 beneficiaries, against an average of 3,544 among the 117,163 providers of this specialty who prescribed in Part D. Brand-name drugs were 21% of claims.
Most prescribed
- Furosemide19 claims
- Omeprazole11 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): 77.1 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).
Marci S. Yoss among 2,265 family medicine physician records in Massachusetts
Marci S. Yoss, MD is one of 2,265 family medicine physician records with a practice address in Massachusetts. 80% 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 14% of them.
- NPI issued2006 · 14% of these records are older, 55% newer
- In a Medicare fileYes · 80% of these records are
- In the CMS Doctors and Clinicians fileNo · 68% of these records are
- Record last updated2016 · 59% 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 Massachusetts practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
20 family medicine physician records list a practice address in Northampton
They are 20 of the 1,816 NPPES records with a practice address in Northampton, and 2,265 family medicine physician records in Massachusetts.
All 2,265 in Massachusetts → Every provider in Northampton → Family Medicine Physician nationwide →
The 8 family medicine physician records with the nearest ZIP codes
- Shelly Berkowitz, M.D.Northampton, MA 010601982674479
- Charles Brummer, M.D.Northampton, MA 010601730159963
- Grant Dawson, M.D.Northampton, MA 010601568648749
- Julia De Almeida, MDNorthampton, MA 010601295792349
- Joyce Duncan, MDNorthampton, MA 010601770559296
- Adam Garretson, MDNorthampton, MA 010601912998915
- Kathleen Grandison, MDNorthampton, MA 010601144398868
- Lora Grimes, MDNorthampton, MA 010601518907724
Common questions
What is Marci S. Yoss, MD's NPI number?
Marci S. Yoss, MD's National Provider Identifier (NPI) is 1942215363, issued on Jul 31, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Marci S. Yoss, MD located?
The NPPES record lists a practice address at 325B King Street, Northampton, MA, 01060. Phone: (413) 387-4100. Providers update this record themselves, so call before visiting.
How can I verify Marci S. Yoss, MD's license?
NPPES lists Massachusetts license number 54446, as entered by the provider. Search the Massachusetts Board of Registration in Medicine at https://findmydoctor.mass.gov/. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Marci S. Yoss, MD prescribe under Medicare Part D?
In 2024, Marci S. Yoss, MD had 80 Medicare Part D claims for 18 beneficiaries; the average among family medicine physician prescribers was 3,544. Part D covers Medicare prescriptions only.
What is Marci S. Yoss, MD's MIPS final score?
The 2023 MIPS final score is 77.1 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.