Recently Updated NPI Information — some details in this NPI profile have been updated in the NPI registry within the last 60 days.

JOHN W GRAEF M.D.
NPI 1982680575
Pediatrics - Medical Toxicology in Boston, MA

Q: What is John Graef's NPI number?

The NPI number for John Graef is 1982680575. It was assigned to this individual provider in the NPPES registry on December 16, 2005.

Q: What is John Graef's specialty?

The primary specialty registered for this NPI is Pediatrics, specializing in Medical Toxicology, with taxonomy code 2080T0002X.

Q: When was this NPI record last updated?

The NPPES record for John Graef was last updated on July 13, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 41 days ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.

Active since December 16, 2005

333 LONGWOOD AVE, BOSTON, MA 02115(617) 355-8263(617) 277-8934 Get Directions Write a Review

NPPES record last updated: July 13, 2026. Verified against the NPPES registry weekly; last sync: August 16, 2026.

Record update history: Jul 13, 2026, Sep 11, 2025 (2 updates tracked since 2025).

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About John W Graef M.d. NPPES

Official registry information on file with the National Plan and Provider Enumeration System.

JOHN W GRAEF M.D. (NPI 1982680575) is an individual medical toxicology provider in Boston, Massachusetts, licensed in Massachusetts (33948) and active in the NPI registry since December 2005.

NPPES Registry Identity

NPI1982680575

Entity TypeIndividualMale

Primary Taxonomy2080T0002X

Provider Legal NameJOHN W GRAEFCredential: M.D.

Location Address333 LONGWOOD AVEBoston, MA 02115-5711

Mailing Address147 Milk Street, Provider Enrollment - 9th FloorBoston, MA 02109-4862 · (617) 559-8053 · Fax (617) 421-3487

Phone(617) 355-8263

Fax(617) 277-8934

Sole ProprietorNo

Enumeration DateDecember 16, 2005

Last NPPES UpdateJuly 13, 20262 updates tracked since enumeration

✔ NPI 1982680575 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses 3

★ Primary SpecialtyPediatrics · Medical ToxicologyAllopathic & Osteopathic Physicians

Taxonomy Code2080T0002X

License✔ Licensed in MA · 33948

Definition

Medical toxicologists are physicians that specialize in the prevention, evaluation, treatment and monitoring of injury and illness from exposures to drugs and chemicals, as well as biological and radiological agents. Medical toxicologists care for people in clinical, academic, governmental and public health settings, and provide poison control center leadership. Important areas of medical toxicology include acute drug poisoning, adverse drug events, drug abuse, addiction and withdrawal, chemicals and hazardous materials, terrorism preparedness, venomous bites and stings, and environmental and workplace exposures.

Also ListedPediatricsTaxonomy 208000000X · License 33948 (MA)

Also ListedHospitalistTaxonomy 208M00000X · License 33948 (MA)

333 LONGWOOD AVE, Boston, MA 02115

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Other Identifiers 6

OtherV02406MA · Blue Cross

OtherPP624MA · Harvard Pilgrim

Other0003908MA · Neighborhood Health

Medicaid2020785MA

Other4147717-003MA · Cigna

Other715698MA · Tufts

Other Providers at the Same Location NPPES 20

Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.

KERRY MCGREGOR PSY.D.

Psychologist (Clinical Child & Adolescent)

333 LONGWOOD AVE
BOSTON, MA 02115

Suffolk County (757) 376-9801

LEANNA SHEA RD

Dietitian, Registered

333 LONGWOOD AVE
BOSTON, MA 02115

Suffolk County (617) 355-4677

JUNE OKADA MS

Speech-Language Pathologist

333 LONGWOOD AVE
BOSTON, MA 02115

Suffolk County (617) 354-1523

GRETA MARY SMITH

Dietitian, Registered (Nutrition, Pediatric)

333 LONGWOOD AVE
BOSTON, MA 02115

Suffolk County (617) 355-7181

JACQUELINE MIRANDA LICSW

Social Worker (Clinical)

333 LONGWOOD AVE, FLOOR 6
BOSTON, MA 02115

Suffolk County (617) 355-5250

MERRILL WEITZEL MD

Obstetrics & Gynecology

333 LONGWOOD AVE, 5TH FLOOR CHILDRENS HOSPITAL PEDI GYN
BOSTON, MA 02115

Suffolk County (617) 355-7648

ELSEY WEISBERG

Dietitian, Registered

333 LONGWOOD AVE
BOSTON, MA 02115

Suffolk County (508) 423-5001

MARTA RAMON KRAUEL MD

Pediatrics (Pediatric Endocrinology)

333 LONGWOOD AVE, ENDOCRINE DIVISION 6TH FLOOR
BOSTON, MA 02115

Suffolk County (617) 355-6000

Frequently Asked Questions NPPES & CMS

Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.

What is John Graef's NPI number?

The NPI number for John Graef is 1982680575. It was assigned to this individual provider in the NPPES registry on December 16, 2005.

Where is John Graef located?

John Graef practices at 333 Longwood Ave, Boston, MA 02115. The listed phone number is (617) 355-8263.

What is John Graef's specialty?

The primary specialty registered for this NPI is Pediatrics, specializing in Medical Toxicology, with taxonomy code 2080T0002X.

When was this NPI record last updated?

The NPPES record for John Graef was last updated on July 13, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 41 days ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.