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

Individual provider Critical Care Medicine (Internal Medicine) Physician · NPI 1124290853

Dr. John R Greenland, MD, PHD is a Critical Care Medicine (Internal Medicine) Physician in San Francisco, California. Licensed in California. Registered with an NPI since 2008.

Licensed in
CA
In the registry since
2008
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

4150 Clement St
San Francisco, CA 94121-1563
Phone: (415) 221-4810
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Pulmonary Disease Physician (primary) Taxonomy 207RP1001X · Licence A111543 (CA)
Critical Care Medicine (Internal Medicine) Physician Taxonomy 207RC0200X · Licence A111543 (CA)

Record details

NPI number1124290853
Entity typeIndividual (Type 1)
GenderMale
Credentials MD , PHD
Sole proprietorNo
NPI enumeratedApril 2, 2008
Last updated in NPPESMarch 16, 2023
Certification dateMarch 16, 2023

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