William Stephen Maher, M.D.
Internal Medicine Physician · Newton Lower Falls, MA
William Stephen Maher, M.D. is an internal medicine physician with a practice address in Newton Lower Falls, Massachusetts, and NPI 1194835637, issued on Aug 30, 2006. Check the license (Massachusetts 78946, as entered in NPPES) on the Massachusetts Board of Registration in Medicine; the Medicare figures below come from public CMS files.
- Name
- William Stephen Maher
- Credential
- M.D.
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- 78946 MA
Self-reported in NPPES; status is on the state search - Practice location
- 2000 Washington St, Newton Lower Falls, MA 02462
- Phone
- (617) 964-5020
- Enumerated
- Aug 30, 2006
- Record last updated
- May 14, 2008 (not updated in 18 years: call before relying on the address or phone)
- Fax
- (617) 964-3033
- Medicaid ID
- 3198600 MA
- Medicare enrollment
- Enrolled (PECOS I20050131000991); accepts Medicare assignment
- Medical or professional school
- Georgetown University School Of Medicine, 1991
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 6,825 in Massachusetts → Look up another NPI →
Also registered at 2000 Washington St
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify William Stephen Maher in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMassachusetts Board of Registration in Medicine
Search for license 78946Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
90% more Medicare Part D claims than the average internal medicine physician in 2024
6,023 Medicare Part D claims for 653 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. Brand-name drugs were 9% of claims. 134 claims were for opioids.
Most prescribed
- Atorvastatin Calcium621 claims
- Lisinopril369 claims
- Amlodipine Besylate303 claims
- Metoprolol Succinate220 claims
- Losartan Potassium214 claims
- Levothyroxine Sodium162 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 one group practice
- Mass General Brigham Medical Group Suburban Massachusetts IncNewton, MA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
William Stephen Maher among 6,825 internal medicine physician records in Massachusetts
William Stephen Maher, M.D. is one of 6,825 internal medicine physician records with a practice address in Massachusetts. 75% 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 12% of them.
- NPI issued2006 · 12% of these records are older, 54% newer
- In a Medicare fileYes · 75% of these records are
- In the CMS Doctors and Clinicians fileYes · 60% of these records are
- Graduated1991 · median 2004 among the 4,103 with a school on file
- Record last updated2008 · 64% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207R00000X and a Massachusetts practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
15 internal medicine physician records list a practice address in Newton Lower Falls
They are 15 of the 31 NPPES records with a practice address in Newton Lower Falls, and 6,825 internal medicine physician records in Massachusetts.
All 6,825 in Massachusetts → Every provider in Newton Lower Falls → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- Thomas Cunningham, M.D.Newton Lower Falls, MA 024621326153503
- Allan Engel, M.D.Newton Lower Falls, MA 024621104813443
- Arthur Kennedy, M.D.Newton, MA 024621043223266
- Nicholas Michael Mascoli, M.D.Newton Lower Falls, MA 024621013964717
- John O Brien, MDNewton Lower Falls, MA 024621588678965
- Steven Pestka, M.D.Newton, MA 024621407807498
- Harry Schrager, M.D.Newton, MA 024621871540666
- David Wachs, M.D.Newton, MA 024621073571436
Common questions
What is William Stephen Maher, M.D.'s NPI number?
William Stephen Maher, M.D.'s National Provider Identifier (NPI) is 1194835637, issued on Aug 30, 2006. An NPI identifies a provider in billing; it is not a license.
Where is William Stephen Maher, M.D. located?
The NPPES record lists a practice address at 2000 Washington St, Newton Lower Falls, MA, 02462. Phone: (617) 964-5020. Providers update this record themselves, so call before visiting.
How can I verify William Stephen Maher, M.D.'s license?
NPPES lists Massachusetts license number 78946, 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 William Stephen Maher, M.D. prescribe under Medicare Part D?
In 2024, William Stephen Maher, M.D. had 6,023 Medicare Part D claims for 653 beneficiaries; the average among internal medicine physician prescribers was 3,176. 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.