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

Individual provider Internal Medicine Physician · NPI 1366452823

William Thomas Harless, MD is an Internal Medicine Physician in San Diego, California. Licensed in California. Registered with an NPI since 2006.

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

300 Fir St
San Diego, CA 92101-2327
Phone: (858) 499-2600
Fax: (619) 446-1569
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Internal Medicine Physician (primary) Taxonomy 207R00000X · Licence G27839 (CA)

Record details

NPI number1366452823
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorNo
NPI enumeratedAugust 8, 2006
Last updated in NPPESJune 19, 2013

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