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

Dr. Troels Halfeld Nielsen, MD, PHD

Individual provider Surgery Physician · NPI 1235651860

Dr. Troels Halfeld Nielsen, MD, PHD is a Surgery Physician in Stanford, California. Licensed in California. Registered with an NPI since 2017.

Licensed in
CA
In the registry since
2017
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.

See every abbreviation used in this directory →

Practice location Address checks out

300 Pasteur Dr Rm 281
Stanford, CA 94305-2200
Phone: (650) 334-9700
Show map & directions

Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Neurological Surgery Physician (primary) Taxonomy 207T00000X · Licence F494 (CA)
Surgery Physician Taxonomy 208600000X · Licence 494 (CA)

Record details

NPI number1235651860
Entity typeIndividual (Type 1)
GenderMale
Credentials MD , PHD
Sole proprietorNo
NPI enumeratedJuly 14, 2017
Last updated in NPPESAugust 4, 2017

Other providers in Stanford