Sonia Stewart, NP
Gerontology Nurse Practitioner · Waltham, MA
Sonia Stewart, NP is a gerontology nurse practitioner with a practice address in Waltham, Massachusetts, and NPI 1194878124, issued on Jan 21, 2007. Check the license (Massachusetts 264090, as entered in NPPES) with the Massachusetts board that licenses this profession; the Medicare figures below come from public CMS files.
- Name
- Sonia Stewart
- Credential
- NP
- Primary taxonomy
- Gerontology Nurse Practitioner 363LG0600X
- License number
- 264090 MA
Self-reported in NPPES; status is on the state search - Practice location
- 950 Winter St, Waltham, MA 02451
- Phone
- (781) 472-8784
- Enumerated
- Jan 21, 2007
- 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 gerontology nurse practitioner records → All 379 in Massachusetts → Look up another NPI →
Also registered at 950 Winter St
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Francisca Adams, MSN, APRN, BCGerontology Nurse Practitioner1477603819
- Kerry Assarian, NPAdult Health Nurse Practitioner1457499923
- Marina Borocov, NPGerontology Nurse Practitioner1326372483
- Anne Marie Bourque, NPNurse Practitioner1871544981
- Karin Broden, NPAdult Health Nurse Practitioner1134141427
- Florence Calore, R.N., MS. NPGerontology Nurse Practitioner1942367552
Verify Sonia Stewart in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWhich Massachusetts board licenses this profession
Search for license 264090Check 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 gerontology nurse practitioner in 2024
27 Medicare Part D claims, against an average of 1,369 among the 6,165 providers of this specialty who prescribed in Part D. Brand-name drugs were 0% of claims.
Most prescribed
- Duloxetine Hcl12 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.
Sonia Stewart among 379 gerontology nurse practitioner records in Massachusetts
Sonia Stewart, NP is one of 379 gerontology nurse practitioner records with a practice address in Massachusetts. 70% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2007, is newer than 16% of them.
- NPI issued2007 · 16% of these records are older, 73% newer
- In a Medicare fileYes · 70% of these records are
- In the CMS Doctors and Clinicians fileNo · 51% of these records are
- Record last updated2007 · 54% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 363LG0600X and a Massachusetts practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
33 gerontology nurse practitioner records list a practice address in Waltham
They are 33 of the 2,111 NPPES records with a practice address in Waltham, and 379 gerontology nurse practitioner records in Massachusetts.
All 379 in Massachusetts → Every provider in Waltham → Gerontology Nurse Practitioner nationwide →
The 8 gerontology nurse practitioner records with the nearest ZIP codes
- Francisca Adams, MSN, APRN, BCWaltham, MA 024511477603819
- Mary Bannon, NPWaltham, MA 024511043392590
- Florence Calore, R.N., MS. NPWaltham, MA 024511942367552
- Cheryl Hatch, NPWaltham, MA 024511245381342
- Linda Martin, APRN, BCWaltham, MA 024511346399193
- Mary Miller, ANP,GNPWaltham, MA 024511790834166
- Susan Mullaney, NPWaltham, MA 024511114081247
- Linda Satkowski, NPWaltham, MA 024511043360837
Common questions
What is Sonia Stewart, NP's NPI number?
Sonia Stewart, NP's National Provider Identifier (NPI) is 1194878124, issued on Jan 21, 2007. An NPI identifies a provider in billing; it is not a license.
Where is Sonia Stewart, NP located?
The NPPES record lists a practice address at 950 Winter St, Waltham, MA, 02451. Phone: (781) 472-8784. Providers update this record themselves, so call before visiting.
How can I verify Sonia Stewart, NP's license?
NPPES lists Massachusetts license number 264090, as entered by the provider. Search the Massachusetts board that licenses this profession; the NPPES record confirms identity only.
How much does Sonia Stewart, NP prescribe under Medicare Part D?
In 2024, Sonia Stewart, NP had 27 Medicare Part D claims; the average among gerontology nurse practitioner prescribers was 1,369. 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.