Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of October 4, 2026.
NPIDirectory

Joshua James Gruber, MD, PHD

Individual provider Hematology (Internal Medicine) Physician · NPI 1437441904

Joshua James Gruber, MD, PHD practises Medical Oncology in Stanford, California. Graduated from Perelman School of Med at the University of Pennsylvania in 2011, 15 years ago. Practices with University of Texas Southwestern Medical Center at Dallas, a 3,149-clinician group, works from 3 locations and accepts Medicare assignment. Licensed in California and Texas.

Years since qualifying
15
Trained at
Perelman School of Med at the University of Pennsylvania
Licensed in
CA, TX
In the registry since
2011
Specialties on file
4
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

300 Pasteur Dr
Stanford, CA 94305-2200
Phone: (650) 723-4000
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Additional practice locations (2)

  • 900 Blake Wilbur Dr, Palo Alto, CA 94304-2201 — (650) 498-6004
  • 6201 Harry Hines Blvd, Dallas, TX 75390-2200 — (214) 633-5555

Specialties & licences

Medical Oncology Physician (primary) Taxonomy 207RX0202X · Licence A122149 (CA)
Hematology (Internal Medicine) Physician Taxonomy 207RH0000X · Licence A122149 (CA)
Internal Medicine Physician Taxonomy 207R00000X · Licence A122149 (CA)
Medical Oncology Physician Taxonomy 207RX0202X · Licence T2614 (TX)

Record details

NPI number1437441904
Entity typeIndividual (Type 1)
GenderMale
Credentials MD , PHD
Sole proprietorNo
NPI enumeratedMay 3, 2011
Last updated in NPPESSeptember 17, 2026
Certification dateSeptember 17, 2026

Medicare enrollment

From the CMS Doctors & Clinicians file — this clinician is enrolled in Medicare.

Medicare specialtyMEDICAL ONCOLOGY
Medical schoolPERELMAN SCHOOL OF MED AT THE UNIVERSITY OF PENNSYLVANIA
Graduated 2011 (15 years in practice)
Group practice University Of Texas Southwestern Medical Center At Dallas — 3149 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount

Medicare patients and services, 2024

From the CMS Medicare Physician & Other Practitioners file for calendar year 2024. It counts Original Medicare patients only, so a practice that mostly sees Medicare Advantage or privately insured patients looks smaller here than it is.

Medicare patients26
Services billed 78 a service is one billed item, such as a visit, a test or a procedure
Average patient age73

Dollar amounts are not shown. What Medicare pays a practice is gross billings, before staff, premises and tax and including the cost of any drugs it administers, so it is not what a clinician earns.

Payments from drug and device companies, 2025

Drug and device makers are required by federal law (the Physician Payments Sunshine Act) to report what they pay or give to clinicians, and CMS publishes the reports as Open Payments. This is the 2025 program year. A report is a record of a payment, not an allegation of anything, and many are small items such as meals. Only general payments are listed here; research payments and ownership or investment interests are reported separately by CMS and are not shown.

Food and Beverage $15 1 payment · a meal or drink at a meeting or visit, not a fee

Each amount is the sum of what companies reported for that kind of payment in 2025, rounded to the dollar. Not all of it is income to the clinician: a meal is not a fee, a charitable contribution goes to a charity, and a royalty or an acquisition payment is not a salary.

Check a report, or dispute one, at the source in CMS’s own tool, Open Payments. Corrections go through CMS’s dispute process. This site removes a home address on request and asks for no proof, because that is privacy; it will not remove an accurate payment report on request, because that is a statutory public disclosure.

Practises at

Facilities the CMS Facility Affiliation file lists for this clinician.

  • Ut Of Texas Southwestern University Hospital - William P. Clements Jr. Hospital · Dallas, TX

Colleagues at University of Texas Southwestern Medical Center at Dallas

Clinicians the CMS Doctors & Clinicians file lists under the same group practice. CMS counts 3149 clinicians in the practice; 12 are shown here.

Other providers in Stanford