Kathleen Claire Horst, M.D.
Radiation Oncology Physician · Stanford, CA
Kathleen Claire Horst, M.D. is a radiation oncology physician with a practice address in Stanford, California, and NPI 1144385386, issued on Dec 27, 2006. Check the license (California A72961, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Kathleen Claire Horst
- Credential
- M.D.
- Primary taxonomy
- Radiation Oncology Physician 2085R0001X
- License number
- A72961 CA
Self-reported in NPPES; status is on the state search - Practice location
- 875 Blake Wilbur Dr, Stanford, CA 94305
- Phone
- (650) 736-7715
- Enumerated
- Dec 27, 2006
- Record last updated
- Jul 8, 2007 (not updated in 19 years: call before relying on the address or phone)
- Fax
- (650) 725-8231
- Medicare enrollment
- Enrolled (PECOS I20040831001431); accepts Medicare assignment
- Medical or professional school
- Stanford University School Of Medicine, 1999
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest radiation oncology physician records → All 735 in California → Look up another NPI →
Also registered at 875 Blake Wilbur Dr
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Laura Asaro, NPNurse Practitioner1003916636
- Nam Cho, M.D., PH.D.Radiation Oncology Physician1669668323
- Taylor Fogel, PA-CPhysician Assistant1942669700
- Amreen Husain, MDObstetrics & Gynecology Physician1790856474
- Ann Johnson, P.A.-C.Medical Physician Assistant1023210689
- Michael Kaplan, M.D.Otolaryngology Physician1851437131
Verify Kathleen Claire Horst in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A72961Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
The practice group's MIPS final score for 2023 (Medicare payment program): 76.5 of 100
The Merit-based Incentive Payment System score is reported for the practice group, not for one clinician alone. Four categories are weighted into the final score; the average among 454,083 clinicians with a measured score was 83.5.
Source: CMS Quality Payment Program, MIPS performance year 2023, group reporting; category weights for 2023 (qpp.cms.gov).
One hospital affiliation
- Stanford Health CareStanford, CA · Acute Care Hospitals5 of 5 stars
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through); hospitals matched to CMS Hospital General Information (Care Compare) (data.cms.gov). Star ratings are CMS hospital ratings, not ratings of this provider.
Kathleen Claire Horst among 735 radiation oncology physician records in California
Kathleen Claire Horst, M.D. is one of 735 radiation oncology physician records with a practice address in California. 83% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2006, is newer than 16% of them.
- NPI issued2006 · 16% of these records are older, 55% newer
- In a Medicare fileYes · 83% of these records are
- In the CMS Doctors and Clinicians fileYes · 74% of these records are
- Graduated1999 · median 2005 among the 545 with a school on file
- Record last updated2007 · 55% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 2085R0001X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
43 radiation oncology physician records list a practice address in Stanford
They are 43 of the 5,606 NPPES records with a practice address in Stanford, and 735 radiation oncology physician records in California.
All 735 in California → Every provider in Stanford → Radiation Oncology Physician nationwide →
The 8 radiation oncology physician records with the nearest ZIP codes
- Mark Buyyounouski, M.D.Stanford, CA 943051912927021
- Sarah Donaldson, M.D.Stanford, CA 943051033276316
- Steven Hancock, M.D.Stanford, CA 943051821136631
- Wendy Hara, M.D.Stanford, CA 943051437343076
- Richard Hoppe, M.D.Stanford, CA 943051730221821
- Daniel Kapp, MDStanford, CA 943051063550747
- Elizabeth Kidd, M.D.Stanford, CA 943051760508899
- Quynh-Thu Le, M.D.Stanford, CA 943051316002116
Common questions
What is Kathleen Claire Horst, M.D.'s NPI number?
Kathleen Claire Horst, M.D.'s National Provider Identifier (NPI) is 1144385386, issued on Dec 27, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Kathleen Claire Horst, M.D. located?
The NPPES record lists a practice address at 875 Blake Wilbur Dr, Stanford, CA, 94305. Phone: (650) 736-7715. Providers update this record themselves, so call before visiting.
How can I verify Kathleen Claire Horst, M.D.'s license?
NPPES lists California license number A72961, as entered by the provider. Search the Medical Board of California at https://www.mbc.ca.gov/License-Verification/default.aspx. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
What is Kathleen Claire Horst, M.D.'s MIPS final score?
The 2023 MIPS final score is 76.5 of 100, reported for the practice group. The average among 454,083 clinicians with a measured score was 83.5.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.