William J. Barbaresi, M.D.
Developmental - Behavioral Pediatrics Physician · Boston, MA
William J. Barbaresi, M.D. is a developmental - behavioral pediatrics physician with a practice address in Boston, Massachusetts, and NPI 1689654816, issued on Jan 23, 2006. Check the license (Massachusetts 55645, as entered in NPPES) on the Massachusetts Board of Registration in Medicine; the Medicare figures below come from public CMS files.
- Name
- William J. Barbaresi
- Credential
- M.D.
- Primary taxonomy
- Developmental - Behavioral Pediatrics Physician 2080P0006X
- License number
- 55645 MA
Self-reported in NPPES; status is on the state search - Practice location
- 300 Longwood Ave, Boston, MA 02115
- Phone
- (617) 355-4534
- Enumerated
- Jan 23, 2006
- Record last updated
- Jun 29, 2022
- Medicare enrollment
- Enrolled (PECOS I20160114000229); accepts Medicare assignment
- Medical or professional school
- State University Of New York At Buffalo School Of Medicine, 1984
- Entity
- Type 1 · individual
8 nearest developmental - behavioral pediatrics physician records → All 70 in Massachusetts → Look up another NPI →
Also registered at 300 Longwood Ave
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Sylvia Abadir, MDPediatric Cardiology Physician1427366459
- Isabel Abbott, MDNeurology with Special Qualifications in Child Neurology Physician1033772579
- Kristin Abdelnour, PTPhysical Therapist1982821302
- Mohamed Abdelrahman, MDThoracic Surgery (Cardiothoracic Vascular Surgery) Physician1558050591
- Nadia Abdulrazak, N.P.Adult Health Nurse Practitioner1952616682
- Dhatri AbeyaratneStudent in an Organized Health Care Education/Training Program1437098233
Verify William J. Barbaresi in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMassachusetts Board of Registration in Medicine
Search for license 55645Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
41% fewer Medicare Part D claims than the average developmental - behavioral pediatrics physician in 2024
64 Medicare Part D claims, against an average of 109 among the 122 providers of this specialty who prescribed in Part D. Brand-name drugs were 0% of claims.
Most prescribed
- Methylphenidate Er24 claims
- Aripiprazole12 claims
- Guanfacine Hcl Er12 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
- Children's Hospital Pediatric Associates, IncBoston, MA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
William J. Barbaresi among 70 developmental - behavioral pediatrics physician records in Massachusetts
William J. Barbaresi, M.D. is one of 70 developmental - behavioral pediatrics physician records with a practice address in Massachusetts. 26% 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 10% of them.
- NPI issued2006 · 10% of these records are older, 50% newer
- In a Medicare fileYes · 26% of these records are
- In the CMS Doctors and Clinicians fileYes · 14% of these records are
- Graduated1984 · median 2001 among the 10 with a school on file
- Record last updated2022 · 66% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 2080P0006X and a Massachusetts practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Developmental - Behavioral Pediatrics Physician providers in Massachusetts
There are 70 developmental - behavioral pediatrics physician records in Massachusetts.
All 70 in Massachusetts → Every provider in Boston → Developmental - Behavioral Pediatrics Physician nationwide →
The 8 developmental - behavioral pediatrics physician records with the nearest ZIP codes
- Ronald Becker, MDBoston, MA 021151881707479
- Julie Bickel, MDBoston, MA 021151518163377
- Jo-Ann Bier, MDBoston, MA 021151649383258
- Constance Keefer, MDBoston, MA 021151023055712
- Sharon Levy, MDBoston, MA 021151962502260
- Ramzi Nasir, M.D.Boston, MA 021151831225424
- Judith Palfrey, MDBoston, MA 021151548361447
- Demetra Pappas, M.D.Boston, MA 021151538105788
Common questions
What is William J. Barbaresi, M.D.'s NPI number?
William J. Barbaresi, M.D.'s National Provider Identifier (NPI) is 1689654816, issued on Jan 23, 2006. An NPI identifies a provider in billing; it is not a license.
Where is William J. Barbaresi, M.D. located?
The NPPES record lists a practice address at 300 Longwood Ave, Boston, MA, 02115. Phone: (617) 355-4534. Providers update this record themselves, so call before visiting.
How can I verify William J. Barbaresi, M.D.'s license?
NPPES lists Massachusetts license number 55645, 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 J. Barbaresi, M.D. prescribe under Medicare Part D?
In 2024, William J. Barbaresi, M.D. had 64 Medicare Part D claims; the average among developmental - behavioral pediatrics physician prescribers was 109. 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.