Ruth WilliamsonMD
Radiation Oncology·Pasadena, CA
Ruth Williamson, MD is a Radiation Oncology provider in Pasadena, CA, as of July 2026.
- NPI1952486912
- Registered2006
- Class of1989
Case volumes, referral patterns, and payer mix live in DataLily AI Insights.
Education
Education on record as of August 2026.
Ruth Williamson at a glance
- Provider
- Ruth Williamson
- Credential
- MD
- Specialty
- Radiation Oncology
- Location
- Pasadena, CA
- Medical school
- University of Southern California Keck School of Medicine
- Graduated
- 1989
- NPI registered
- 2006
- NPI
- 1952486912
- Snapshot
- July 2026
Identity, specialty, and affiliations change over time. This is not an endorsement, and not clinical, billing, or legal advice. Providers may request corrections at founders@datalilyai.com. Read the DataLily AI data methodology.
Questions
Where does Ruth Williamson practice?
Ruth Williamson, MD is based in Pasadena, CA. Affiliations reflect the current DataLily AI snapshot (July 2026) and can change.
What is Ruth Williamson's NPI number?
Ruth Williamson's National Provider Identifier (NPI) is 1952486912, registered in 2006. Specialty on record: Radiation Oncology; credential MD.
Where did Ruth Williamson go to medical school?
Ruth Williamson, MD attended University of Southern California Keck School of Medicine, graduating in 1989.
How many Radiation Oncology providers in California work at ambulatory surgery centers?
88 Radiation Oncology surgeons and proceduralists in California are affiliated with ambulatory surgery centers in DataLily AI's current snapshot, Ruth Williamson among them. The California Radiation Oncology directory lists each one by city with credential, NPI, and center affiliations.
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