License & Identifications

A medical license is required for a doctor to practice medicine in a particular state. Requirements vary by state but most require, at a minimum, post-graduate training in the doctor’s specific specialty. An NPI number is a national identifier unique to an individual health care provider and is managed by the Center for Medicare & Medicaid Services (CMS).

Learn more about Dr. Lydia Mertens:

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Specialties & Research

Dr. Lydia Mertens, MD is board certified in Family Medicine.

Education & Awards

Dr. Mertens graduated from University of California at Davis.


Dr. Mertens has 2 hospital affiliations:

  • Kaiser Foundation Hospital - Santa Rosa 
  • Santa Rosa Medical Center 


  • Spanish

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Additional Information
Dr. Lydia Hasbrouck Mertens MD is a female Family Practitioner, has 25 years of experience and practices in Family Medicine.
Where does Dr. Lydia H. Mertens practice?
Dr. Lydia Mertens has 1 office location.
Dr. Lydia Mertens practices Family Medicine near Sebastopol, CA.
See Sebastopol Primary Care Doctors.