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

Individual provider Infectious Disease Physician · NPI 1861472649

Dr. John Robert Nienow, MD is an Internal Medicine in San Francisco, California. Graduated from Yale University School of Medicine in 1988, 38 years ago. Works from 2 locations and accepts Medicare assignment. Licensed in California.

Years since qualifying
38
Trained at
Yale University School of Medicine
Licensed in
CA
In the registry since
2006
What do these letters mean?
MD — Doctor of Medicine
A physician who completed allopathic medical school.

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Practice location Address checks out

2186 Geary Blvd Ste 314
San Francisco, CA 94115-3457
Phone: (415) 202-1550
Fax: (415) 776-8233
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Additional practice locations (1)

  • 558 Clayton St, San Francisco, CA 94117-2907 — (415) 746-1950

Specialties & licences

Infectious Disease Physician (primary) Taxonomy 207RI0200X · Licence 00G795490 (CA)

Record details

NPI number1861472649
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorNo
NPI enumeratedJanuary 18, 2006
Last updated in NPPESMay 6, 2025
Certification dateMay 6, 2025

Medicare enrollment

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

Medicare specialtyINTERNAL MEDICINE
Medical schoolYALE UNIVERSITY SCHOOL OF MEDICINE
Graduated 1988 (38 years in practice)
Accepts Medicare assignment Yes — accepts the Medicare-approved amount

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