Peter K. Sien, MD, Inc.
NPI 1063467033 · Radiation Oncology Physician · Modesto, CA
Peter K. Sien, MD, Inc. is a Radiation Oncology Physician organization in Modesto, CA (NPI 1063467033).
Provider details
- NPI number
- 1063467033
- Entity type
- Organization
- Primary specialty
- Radiation Oncology PhysicianAllopathic & Osteopathic Physicians
- Organization subpart
- No
- Authorized official
- Peter Sien, Physician Owner(209) 575-5870
- License
- G32267 (CA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure38% of score
20 yrs in NPPES registry
- Profile completeness38% of score
100% of core fields populated
- Practice footprint23% of score
1 documented practice location
Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our methodology.
Practice location
Mailing address
Registry dates
- Enumerated
- 2006-05-24
- Last updated
- 2015-05-12
Frequently asked questions
- What is Peter K. Sien, MD, Inc.'s NPI number?
- Peter K. Sien, MD, Inc.'s National Provider Identifier (NPI) is 1063467033, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What type of organization is Peter K. Sien, MD, Inc.?
- Peter K. Sien, MD, Inc. is classified in the NPPES registry as Radiation Oncology Physician (Allopathic & Osteopathic Physicians).
- Where is Peter K. Sien, MD, Inc. located?
- Peter K. Sien, MD, Inc.'s practice location on file with NPPES is 1316 Nelson Ave, Modesto, CA 95350-5341.
- What is Peter K. Sien, MD, Inc.'s phone number?
- The practice phone number listed in the NPPES registry for Peter K. Sien, MD, Inc. is (209) 575-5870.
- Who is the authorized official for Peter K. Sien, MD, Inc.?
- The authorized official listed on Peter K. Sien, MD, Inc.'s NPPES record is Peter Sien, Physician Owner. The authorized official registers and maintains the organization's NPI and is not necessarily its owner.
- Is Peter K. Sien, MD, Inc.'s NPI active?
- Yes — Peter K. Sien, MD, Inc.'s NPI (1063467033) is active in the NPPES registry as of the last update on 2015-05-12.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.