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

Lydia Hasbrouck Mertens, MD

Individual provider Internal Medicine Physician · NPI 1366592172

Lydia Hasbrouck Mertens, MD is an Internal Medicine Physician in Sebastopol, California. Licensed in California. Registered with an NPI since 2007.

Licensed in
CA
In the registry since
2007
Specialties on file
2
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

6800 Palm Ave Ste C
Sebastopol, CA 95472
Phone: (707) 824-9999
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Family Medicine Physician (primary) Taxonomy 207Q00000X · Licence G61214 (CA)
Internal Medicine Physician Taxonomy 207R00000X · Licence G61214 (CA)

Record details

NPI number1366592172
Entity typeIndividual (Type 1)
GenderFemale
Credentials MD
Sole proprietorNo
NPI enumeratedJanuary 12, 2007
Last updated in NPPESDecember 21, 2015

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