Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of August 10, 2026.
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John J Welch, MD, PHD

Individual provider Hematology & Oncology Physician · NPI 1326423260

John J Welch, MD, PHD is a Hematology & Oncology Physician in Dulles, Virginia. Practices as a sole proprietor. Licensed in Pennsylvania.

Licensed in
PA
In the registry since
2015
Specialties on file
2
What do these letters mean?
MD — Doctor of Medicine
A physician who completed allopathic medical school.
PHD — Doctor of Philosophy
A research doctorate. In healthcare it usually sits alongside a clinical licence.

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Practice location Address checks out

2040 Antananarivo Pl
Dulles, VA 20189-2039
Phone: (314) 266-8426
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Pediatric Hematology & Oncology Physician (primary) Taxonomy 2080P0207X · Licence MD071820L (PA)
Hematology & Oncology Physician Taxonomy 207RH0003X · Licence MD071820L (PA)

Record details

NPI number1326423260
Entity typeIndividual (Type 1)
GenderMale
Credentials MD , PHD
Sole proprietorYes
NPI enumeratedJuly 21, 2015
Last updated in NPPESJuly 21, 2015
Mailing address2040 Antananarivo Pl, Dulles, VA 20189-2039

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