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

Mark Carlton Rounsaville, MD

Individual provider Radiation Oncology Physician · NPI 1033100284

Mark Carlton Rounsaville, MD is a Radiation Oncology Physician in Nicasio, California. Licensed in California. Registered with an NPI since 2005.

Licensed in
CA
In the registry since
2005
What do these letters mean?
MD — Doctor of Medicine
A physician who completed allopathic medical school.

See every abbreviation used in this directory →

Practice location Address checks out

45 Los Pinos
Nicasio, CA 94946
Phone: (415) 662-2669
Fax: (415) 662-2669
Show map & directions

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

Specialties & licences

Radiation Oncology Physician (primary) Taxonomy 2085R0001X · Licence A39060 (CA)

Record details

NPI number1033100284
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorNo
NPI enumeratedNovember 4, 2005
Last updated in NPPESMay 17, 2022
Certification dateMay 17, 2022