Mark Steven Farnum, PAC
Physician Assistant · Marshfield, MA
Mark Steven Farnum, PAC is a physician assistant with a practice address in Marshfield, Massachusetts, and NPI 1841365319, issued on Nov 21, 2006. Check the license (Massachusetts 642, as entered in NPPES) with the Massachusetts board that licenses this profession; the Medicare figures below come from public CMS files.
- Name
- Mark Steven Farnum
- Credential
- PAC
- Primary taxonomy
- Physician Assistant 363A00000X
- License number
- 642 MA
Self-reported in NPPES; status is on the state search - Practice location
- 50 Tupelo RD, Marshfield, MA 02050
- Phone
- (781) 837-9030
- Enumerated
- Nov 21, 2006
- Record last updated
- Jul 8, 2007 (not updated in 19 years: call before relying on the address or phone)
- Entity
- Type 1 · individual
8 nearest physician assistant records → All 4,713 in Massachusetts → Look up another NPI →
Verify Mark Steven Farnum in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWhich Massachusetts board licenses this profession
Search for license 642Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
95% fewer Medicare Part D claims than the average physician assistant in 2024
39 Medicare Part D claims for 11 beneficiaries, against an average of 830 among the 101,058 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.
Mark Steven Farnum among 4,713 physician assistant records in Massachusetts
Mark Steven Farnum, PAC is one of 4,713 physician assistant records with a practice address in Massachusetts. 78% 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 1% of them.
- NPI issued2006 · 1% of these records are older, 87% newer
- In a Medicare fileYes · 78% of these records are
- In the CMS Doctors and Clinicians fileNo · 68% of these records are
- Record last updated2007 · 38% 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 Massachusetts practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
2 physician assistant records list a practice address in Marshfield
They are 2 of the 263 NPPES records with a practice address in Marshfield, and 4,713 physician assistant records in Massachusetts.
All 4,713 in Massachusetts → Every provider in Marshfield → Physician Assistant nationwide →
The 8 physician assistant records with the nearest ZIP codes
- Karen McKay, PAMarshfield, MA 020501396736765
- Lindsay Driscoll, PAMansfield, MA 020481891083077
- Jennifer Kemp, PA-CMansfield, MA 020481487548798
- Emily Mossman, PA-CMansfield, MA 020481346026689
- Karina Muzikants, PAMedfield, MA 020521245073162
- Scot Sallaway, P.A.Mansfield, MA 020481194730523
- Christa Cosmo, PA-CMedway, MA 020531689313181
- Isabella JacksonMedway, MA 020531013874312
Common questions
What is Mark Steven Farnum, PAC's NPI number?
Mark Steven Farnum, PAC's National Provider Identifier (NPI) is 1841365319, issued on Nov 21, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Mark Steven Farnum, PAC located?
The NPPES record lists a practice address at 50 Tupelo RD, Marshfield, MA, 02050. Phone: (781) 837-9030. Providers update this record themselves, so call before visiting.
How can I verify Mark Steven Farnum, PAC's license?
NPPES lists Massachusetts license number 642, as entered by the provider. Search the Massachusetts board that licenses this profession; the NPPES record confirms identity only.
How much does Mark Steven Farnum, PAC prescribe under Medicare Part D?
In 2024, Mark Steven Farnum, PAC had 39 Medicare Part D claims for 11 beneficiaries; the average among physician assistant prescribers was 830. 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.