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

Ari Katz, MD

Individual provider Hospitalist Physician · NPI 1902290828

Ari Katz, MD is a Hospitalist Physician in Walnut Creek, California. Licensed in Illinois. Registered with an NPI since 2015.

Licensed in
IL
In the registry since
2015
Specialties on file
2
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

1535 Treat Blvd
Walnut Creek, CA 94598-1043
Phone: (925) 296-9228
Fax: (925) 296-9227
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 036146174 (IL)
Hospitalist Physician Taxonomy 208M00000X · Licence 036146174 (IL)

Record details

NPI number1902290828
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorNo
NPI enumeratedMarch 28, 2015
Last updated in NPPESDecember 8, 2025
Certification dateDecember 8, 2025

Other providers in Walnut Creek