Sonja Schaffer
Family Nurse Practitioner · Charlton, MA
Sonja Schaffer is a family nurse practitioner with a practice address in Charlton, Massachusetts, and NPI 1336694439, issued on Aug 18, 2016. Check the license (Massachusetts RN2289480, as entered in NPPES) with the Massachusetts board that licenses this profession; the Medicare figures below come from public CMS files.
- Name
- Sonja Schaffer
- Primary taxonomy
- Family Nurse Practitioner 363LF0000X
- License number
- RN2289480 MA
Self-reported in NPPES; status is on the state search - Practice location
- 9 Trolley Crossing RD, Charlton, MA 01507
- Phone
- (508) 784-1278
- Enumerated
- Aug 18, 2016
- Record last updated
- May 7, 2018 (not updated in 8 years: call before relying on the address or phone)
- Fax
- (508) 784-1279
- Medicare enrollment
- Enrolled (PECOS I20160923000636); accepts Medicare assignment
- Medical or professional school
- University Of Massachusetts Medical School, 2016
- Entity
- Type 1 · individual
Also registered at 9 Trolley Crossing RD
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Teddi Bachawaty, MDObstetrics & Gynecology Physician1154304228
- Heather Briere, NPFamily Nurse Practitioner1598093973
- Lauryn Ciszek, FNPFamily Nurse Practitioner1659983690
- Zung Hoang, M.DObstetrics & Gynecology Physician1184928392
- Monisha Sarin, MDFamily Medicine Physician1609915529
Verify Sonja Schaffer in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWhich Massachusetts board licenses this profession
Search for license RN2289480Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
65% more Medicare Part D claims than the average family nurse practitioner in 2024
2,149 Medicare Part D claims for 214 beneficiaries, against an average of 1,305 among the 140,557 providers of this specialty who prescribed in Part D. Brand-name drugs were 11% of claims. 42 claims were for opioids.
Most prescribed
- Atorvastatin Calcium222 claims
- Lisinopril115 claims
- Amlodipine Besylate97 claims
- Levothyroxine Sodium93 claims
- Gabapentin73 claims
- Hydrochlorothiazide66 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 2 group practices
- Saint Vincent Physician Services IncWorcester, MA
- Shane Speirs MD II PLLCAuburn, MA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
10 family nurse practitioner records list a practice address in Charlton
They are 10 of the 149 NPPES records with a practice address in Charlton, and 4,724 family nurse practitioner records in Massachusetts.
All 10 in Charlton → All 4,724 in Massachusetts → Every provider in Charlton →
Other family nurse practitioner records in Massachusetts
- Christina Abate, N.P.Boston, MA1235414970
- Katelynne Abbott, NPDanvers, MA1932355880
- Georgette Abboud, FNP-CHanscom Afb, MA1538593686
- Irfana Abdulhameed, FNPNorthborough, MA1417661786
- Christina Abouleish, NPNorwell, MA1700515772
- Christine Abraham, NPSouthborough, MA1215774658
- Catherine Abrams, FNP-CNorth Dartmouth, MA1528790599
- Wendy Abrams, FNPBoston, MA1962557801
- Michelle Abreu, FNP-BCArlington, MA1346138914
- Karolyn Abreu Blanco, FNP-BCLawrence, MA1043007644
Common questions
What is Sonja Schaffer's NPI number?
Sonja Schaffer's National Provider Identifier (NPI) is 1336694439, issued on Aug 18, 2016. An NPI identifies a provider in billing; it is not a license.
Where is Sonja Schaffer located?
The NPPES record lists a practice address at 9 Trolley Crossing RD, Charlton, MA, 01507. Phone: (508) 784-1278. Providers update this record themselves, so call before visiting.
How can I verify Sonja Schaffer's license?
NPPES lists Massachusetts license number RN2289480, as entered by the provider. Search the Massachusetts board that licenses this profession; the NPPES record confirms identity only.
How much does Sonja Schaffer prescribe under Medicare Part D?
In 2024, Sonja Schaffer had 2,149 Medicare Part D claims for 214 beneficiaries; the average among family nurse practitioner prescribers was 1,305. 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.