William B. Holgerson, MD
Internal Medicine Physician · Wellesley, MA
William B. Holgerson, MD is an internal medicine physician with a practice address in Wellesley, Massachusetts, and NPI 1356445829, issued on Sep 12, 2006. Check the license (Massachusetts MA42491, as entered in NPPES) on the Massachusetts Board of Registration in Medicine; the Medicare figures below come from public CMS files.
- Name
- William B. Holgerson
- Credential
- MD
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- MA42491 MA
Self-reported in NPPES; status is on the state search - Practice location
- 40 Walnut Street, Wellesley, MA 02481
- Phone
- (781) 235-1224
- Enumerated
- Sep 12, 2006
- Record last updated
- Jun 26, 2019 (not updated in 7 years: call before relying on the address or phone)
- Fax
- (781) 235-4111
- Medicaid ID
- 2063905 MA
- Medicare enrollment
- Enrolled (PECOS I20071012000324); accepts Medicare assignment
- Medical or professional school
- University Of Massachusetts Medical School, 1975
- 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 40 Walnut Street
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Edward Legare, M.D.Internal Medicine Physician1528084191
- Charles Pao, MDInternal Medicine Physician1063516573
- Eric Serrano, MDInternal Medicine Physician1295803146
Verify William B. Holgerson in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMassachusetts Board of Registration in Medicine
Search for license MA42491Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
68% more Medicare Part D claims than the average internal medicine physician in 2024
5,335 Medicare Part D claims for 369 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. 71 claims were for opioids.
Most prescribed
- Atorvastatin Calcium643 claims
- Metoprolol Succinate236 claims
- Hydrochlorothiazide226 claims
- Lisinopril224 claims
- Lorazepam168 claims
- Simvastatin164 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.
Industry payments in 2024: $73.84
4 payments; by number, the most common kind was food and beverage; the largest payer was Pfizer Inc. The 50,334 providers of this specialty with any payment received $1,303.06 on average. Payments are reported by manufacturers, not by the provider, and are not a sign of wrongdoing.
Source: CMS Open Payments, program year 2024 (openpaymentsdata.cms.gov); average among providers of this specialty with at least one payment.
Bills Medicare through one group practice
- Newton Wellesley Primary Care P CWellesley, MA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
William B. Holgerson among 6,825 internal medicine physician records in Massachusetts
William B. Holgerson, MD 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
- Graduated1975 · median 2004 among the 4,103 with a school on file
- Record last updated2019 · 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).
81 internal medicine physician records list a practice address in Wellesley
They are 81 of the 1,117 NPPES records with a practice address in Wellesley, and 6,825 internal medicine physician records in Massachusetts.
All 6,825 in Massachusetts → Every provider in Wellesley → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- Mitchell Abramson, M.D.Wellesley Hills, MA 024811417952284
- Dea Angiolillo, M.D.Wellesley, MA 024811649241985
- Mary Barker, M.D.Wellesley, MA 024811215908132
- Peter Britton, M.D.Wellesley, MA 024811184695082
- Mary Brogan, M.D.Wellesley, MA 024811912987454
- Carol Burd, M.D.Wellesley, MA 024811114998036
- Nancy Corliss, MDWellesley, MA 024811699763482
- Steven Flier, M.D.Wellesley, MA 024811013905751
Common questions
What is William B. Holgerson, MD's NPI number?
William B. Holgerson, MD's National Provider Identifier (NPI) is 1356445829, issued on Sep 12, 2006. An NPI identifies a provider in billing; it is not a license.
Where is William B. Holgerson, MD located?
The NPPES record lists a practice address at 40 Walnut Street, Wellesley, MA, 02481. Phone: (781) 235-1224. Providers update this record themselves, so call before visiting.
How can I verify William B. Holgerson, MD's license?
NPPES lists Massachusetts license number MA42491, 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 B. Holgerson, MD prescribe under Medicare Part D?
In 2024, William B. Holgerson, MD had 5,335 Medicare Part D claims for 369 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.