John W. Graef, M.D.
Pediatric Medical Toxicology Physician · Boston, MA
John W. Graef, M.D. is a pediatric medical toxicology physician with a practice address in Boston, Massachusetts, and NPI 1982680575, issued on Dec 16, 2005. Check the license (Massachusetts 33948, as entered in NPPES) on the Massachusetts Board of Registration in Medicine; the federal record below is the public data PlainDoctor holds for this provider.
- Name
- John W. Graef
- Credential
- M.D.
- Primary taxonomy
- Pediatric Medical Toxicology Physician 2080T0002X
- License number
- 33948 MA
Self-reported in NPPES; status is on the state search - Practice location
- 333 Longwood Ave, Boston, MA 02115
- Phone
- (617) 355-8263
- Enumerated
- Dec 16, 2005
- Record last updated
- Jul 13, 2026
- Fax
- (617) 277-8934
- Medicaid ID
- 2020785 MA
- Entity
- Type 1 · individual
1 nearest pediatric medical toxicology physician record → All 2 in Massachusetts → Look up another NPI →
Also registered at 333 Longwood Ave
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Marissa AaronPediatrics Physician1538687827
- Jessica Addison, MDPediatric Adolescent Medicine Physician1275824948
- Asim Ahmed, M.D.Pediatric Infectious Diseases Physician1265595359
- Nile Albright, M.D.Family Medicine Physician1316985799
- Lindsay AllysonSocial Worker1942032123
- Deena Altschwager, MS, RDRegistered Dietitian1952753865
Verify John W. Graef in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMassachusetts Board of Registration in Medicine
Search for license 33948Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
Pediatric Medical Toxicology Physician providers in Massachusetts
There are 2 pediatric medical toxicology physician records in Massachusetts. No Medicare prescribing, quality score, industry payment or hospital affiliation is published for this NPI.
All 2 in Massachusetts → Every provider in Boston → Pediatric Medical Toxicology Physician nationwide →
The 1 pediatric medical toxicology physician record with the nearest ZIP codes
- Jennifer Ross, M.D.Brookline, MA 024451104289461
Common questions
What is John W. Graef, M.D.'s NPI number?
John W. Graef, M.D.'s National Provider Identifier (NPI) is 1982680575, issued on Dec 16, 2005. An NPI identifies a provider in billing; it is not a license.
Where is John W. Graef, M.D. located?
The NPPES record lists a practice address at 333 Longwood Ave, Boston, MA, 02115. Phone: (617) 355-8263. Providers update this record themselves, so call before visiting.
How can I verify John W. Graef, M.D.'s license?
NPPES lists Massachusetts license number 33948, 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.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. 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.