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

Peter K. Sien, MD, Inc

Organization Radiation Oncology Physician · NPI 1063467033

Peter K. Sien, MD, Inc is a Radiation Oncology Physician in Modesto, California. Licensed in California. Registered with an NPI since 2006.

Licensed in
CA
In the registry since
2006
What do these letters mean?
Inc — Incorporated
A form of business registration, not a clinical qualification.

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Practice location Address checks out

1316 Nelson Ave
Modesto, CA 95350-5341
Phone: (209) 575-5870
Fax: (209) 575-5872
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Radiation Oncology Physician (primary) Taxonomy 2085R0001X · Licence G32267 (CA)

Record details

NPI number1063467033
Entity typeOrganization (Type 2)
Organization subpartNo
Authorized official Peter Sien — Physician Owner · (209) 575-5870
NPI enumeratedMay 24, 2006
Last updated in NPPESMay 12, 2015
Mailing address1316 Nelson Ave, Modesto, CA 95350-5341

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