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

Mr. Donald Martin Nielsen, MD

Individual provider Internal Medicine Physician · NPI 1992686075

Mr. Donald Martin Nielsen, MD is an Internal Medicine Physician in Alamo, California. Practices as a sole proprietor. Licensed in California.

Licensed in
CA
In the registry since
2025
What do these letters mean?
MD — Doctor of Medicine
A physician who completed allopathic medical school.

See every abbreviation used in this directory →

Claim this listing Report a problem Suggest an edit

Practice location Address checks out

195 Oxford Ct
Alamo, CA 94507-1753
Phone: (925) 933-4710
Show map & directions

Directions in Google Maps · Apple Maps · OpenStreetMap

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

Specialties & licences

Internal Medicine Physician (primary) Taxonomy 207R00000X · Licence G36555 (CA)

Record details

NPI number1992686075
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorYes
NPI enumeratedSeptember 8, 2025
Last updated in NPPESSeptember 8, 2025
Certification dateSeptember 8, 2025

Other providers in Alamo