Samuel T. Ahn, MD
Vascular & Interventional Radiology Physician · Fontana, CA
Samuel T. Ahn, MD is a vascular & interventional radiology physician with a practice address in Fontana, California, and NPI 1942286661, issued on Dec 15, 2005. Check the license on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Samuel T. Ahn
- Credential
- MD
- Primary taxonomy
- Vascular & Interventional Radiology Physician 2085R0204X
- License numbers
- 30434 CO
MD21108 HI
04-43282 KS
27274 NE
Self-reported in NPPES; status is on the state search - Practice location
- 9961 Sierra Ave, Fontana, CA 92335
- Phone
- (909) 427-5000
- Enumerated
- Dec 15, 2005
- Record last updated
- May 8, 2026
- Medicare enrollment
- Enrolled (PECOS I20040203000880); accepts Medicare assignment
- Medical or professional school
- University Of Missouri, Kansas City, School Of Medicine, 1989
- Entity
- Type 1 · individual
8 nearest vascular & interventional radiology physician records → All 599 in California → Look up another NPI →
Also registered at 9961 Sierra Ave
A shared address usually means a shared clinic or building; it does not show who employs whom.
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- Michael Adair, MDFamily Medicine Physician1780732651
- Berneva Adams, MDObstetrics & Gynecology Physician1376602987
Verify Samuel T. Ahn in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of CaliforniaCheck the board
- 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
No measured MIPS final score for 2023
CMS assigned the neutral MIPS final score of 75 without scoring Quality, Cost, Promoting Interoperability or Improvement Activities. It is an administrative threshold, so PlainDoctor does not compare it with measured clinicians.
Source: CMS Quality Payment Program, MIPS performance year 2023, group reporting; category weights for 2023 (qpp.cms.gov).
Industry payments in 2024: $110.00
5 payments; by number, the most common kind was food and beverage; the largest payer was Siemens Medical Solutions USA, Inc. The 3,457 providers of this specialty with any payment received $7,206.73 on average. Payments are reported by manufacturers, not by the provider, and are not a sign of wrongdoing.
Source: CMS Open Payments, program year 2024 (openpaymentsdata.cms.gov); average among providers of this specialty with at least one payment.
Bills Medicare through 2 group practices
- Medical Imaging OF Colorado Radiology Imaging Assc PC Etal PTEnglewood, CO
- Radiology Imaging Associates PCEnglewood, CO
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Samuel T. Ahn among 599 vascular & interventional radiology physician records in California
Samuel T. Ahn, MD is one of 599 vascular & interventional radiology physician records with a practice address in California. 88% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2005, is newer than 0% of them.
- NPI issued2005 · 0% of these records are older, 95% newer
- In a Medicare fileYes · 88% of these records are
- In the CMS Doctors and Clinicians fileYes · 83% of these records are
- Graduated1989 · median 2007 among the 497 with a school on file
- Record last updated2026 · 45% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 2085R0204X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Vascular & Interventional Radiology Physician providers in California
There are 599 vascular & interventional radiology physician records in California.
All 599 in California → Every provider in Fontana → Vascular & Interventional Radiology Physician nationwide →
The 8 vascular & interventional radiology physician records with the nearest ZIP codes
- Daksha Bhansali, MDFontana, CA 923351952478851
- John D'Abreo, MDFontana, CA 923351588712533
- Gregory Havlena, MDFontana, CA 923351598993859
- Sam Kim, MDFontana, CA 923351184776569
- Vicente Pierantoni, MDFontana, CA 923351144428475
- David Rajaratnam, M.DFontana, CA 923351235496001
- Long Vu, MDFontana, CA 923351417024308
- Ricardo Escobar, PA-CLoma Linda, CA 923501306557608
Common questions
What is Samuel T. Ahn, MD's NPI number?
Samuel T. Ahn, MD's National Provider Identifier (NPI) is 1942286661, issued on Dec 15, 2005. An NPI identifies a provider in billing; it is not a license.
Where is Samuel T. Ahn, MD located?
The NPPES record lists a practice address at 9961 Sierra Ave, Fontana, CA, 92335. Phone: (909) 427-5000. Providers update this record themselves, so call before visiting.
How can I verify Samuel T. Ahn, MD's license?
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 Samuel T. Ahn, MD's MIPS final score?
CMS assigned the neutral MIPS final score of 75 for 2023 without scoring any category, so it is not a measured result.
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.