Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

John W Graef, M.D.

Pediatric Medical Toxicology Physician in Boston, MA · enumerated 2005.

Data current as of Jul 13, 2026 · sourced from CMS NPPES

National Provider Identifier

1982680575

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Registry record

Entity type Individual (Type 1)

Name John W Graef

Credential M.D.

Sex Male

Practice address 333 Longwood Ave, Boston, MA, 02115

Phone (617) 355-8263

Fax (617) 277-8934

Enumeration date Dec 16, 2005

Last updated in NPPES Sep 11, 2025

Taxonomy & licenses

208000000X Pediatrics Physician Allopathic & Osteopathic Physicians · License 33948 (MA) Secondary

2080T0002X Pediatric Medical Toxicology Physician Allopathic & Osteopathic Physicians · License 33948 (MA) Primary

208M00000X Hospitalist Physician Allopathic & Osteopathic Physicians · License 33948 (MA) Secondary

MD · Doctor of Medicine: A physician who completed medical school (allopathic medicine), residency training, and state licensure. About the MD credential

Other identifiers

Identifier	Type	State	Issuer
V02406	Other	MA	BLUE CROSS
PP624	Other	MA	HARVARD PILGRIM
0003908	Other	MA	NEIGHBORHOOD HEALTH
2020785	Medicaid	MA	-
4147717-003	Other	MA	CIGNA
715698	Other	MA	TUFTS

What is an NPI number?

A National Provider Identifier (NPI) is a unique 10-digit number that CMS assigns to every U.S. healthcare provider and organization under HIPAA. Type 1 NPIs identify individual providers; Type 2 NPIs identify organizations. The NPI appears on insurance claims, prescriptions, and credentialing paperwork, and never changes, even if the provider moves or changes specialty.

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Frequently asked questions

Is this the official NPI registry?

No. NPI Portal is a private site built on public CMS NPPES data. The official registry is npiregistry.cms.hhs.gov, operated by CMS.

What specialty is John Graef?

John Graef is registered in NPPES with the primary taxonomy of Pediatric Medical Toxicology Physician. The taxonomy code describes the provider's classification and area of specialization for claims and credentialing.

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2025-09-11.