Byung Don Ahn, MD
Cardiovascular Disease Physician · Upland, CA
Byung Don Ahn, MD is a cardiovascular disease physician with a practice address in Upland, California, and NPI 1194715193, issued on Oct 21, 2005. Check the license (California A39266, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Byung Don Ahn
- Credential
- MD
- Primary taxonomy
- Cardiovascular Disease Physician 207RC0000X
- License number
- A39266 CA
Self-reported in NPPES; status is on the state search - Practice location
- 685 N 13TH Ave Ste 1, Upland, CA 91786
- Phone
- (909) 500-8683
- Enumerated
- Oct 21, 2005
- Record last updated
- Mar 25, 2026
- Medicare enrollment
- Enrolled (PECOS I20080717000193); accepts Medicare assignment
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest cardiovascular disease physician records → All 2,574 in California → Look up another NPI →
Also registered at 685 N 13TH Ave Ste 1
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Shuchi ParikhFamily Nurse Practitioner1255899605
- Angela Grace Villanueva, FNP-CFamily Nurse Practitioner1154121358
Verify Byung Don Ahn in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A39266Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
2.4 times the Medicare Part D claims of the average cardiovascular disease physician in 2024
7,253 Medicare Part D claims for 1,080 beneficiaries, against an average of 3,078 among the 20,728 providers of this specialty who prescribed in Part D.
Most prescribed
- Metoprolol Succinate758 claims
- Eliquis581 claims
- Atorvastatin Calcium511 claims
- Carvedilol459 claims
- Losartan Potassium428 claims
- Xarelto324 claims
Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.
Industry payments in 2024: $966.87
49 payments; by number, the most common kind was food and beverage; the largest payer was Zoll Services LLC (a/k/a Zoll LifeCor Corp). The 16,686 providers of this specialty with any payment received $3,819.56 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
- Prohealth Partners, A Medical GroupUpland, CA
- United Heart InstituteUpland, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Byung Don Ahn among 2,574 cardiovascular disease physician records in California
Byung Don Ahn, MD is one of 2,574 cardiovascular disease 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 2005, is newer than 0% of them.
- NPI issued2005 · 0% of these records are older, 90% newer
- In a Medicare fileYes · 83% of these records are
- In the CMS Doctors and Clinicians fileYes · 68% of these records are
- Graduated1978 · median 1999 among the 1,742 with a school on file
- Record last updated2026 · 63% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207RC0000X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Cardiovascular Disease Physician providers in California
There are 2,574 cardiovascular disease physician records in California.
All 2,574 in California → Every provider in Upland → Cardiovascular Disease Physician nationwide →
The 8 cardiovascular disease physician records with the nearest ZIP codes
- Richard Bruck, MDUpland, CA 917861366448854
- Carlos Canizales, MDUpland, CA 917861285690909
- Fatima Hakkak, DOUpland, CA 917861568562247
- Suraj Rasania, M.D.Upland, CA 917861245501899
- Padmini Tummala, MDUpland, CA 917861669519500
- Mohd. Qaisar Khan, MDWest Covina, CA 917901487670485
- Kenneth Tye, M.D.West Covina, CA 917901265433965
- Jonathan Tye, M.D.West Covina, CA 917901417057068
Common questions
What is Byung Don Ahn, MD's NPI number?
Byung Don Ahn, MD's National Provider Identifier (NPI) is 1194715193, issued on Oct 21, 2005. An NPI identifies a provider in billing; it is not a license.
Where is Byung Don Ahn, MD located?
The NPPES record lists a practice address at 685 N 13TH Ave Ste 1, Upland, CA, 91786. Phone: (909) 500-8683. Providers update this record themselves, so call before visiting.
How can I verify Byung Don Ahn, MD's license?
NPPES lists California license number A39266, 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.
How much does Byung Don Ahn, MD prescribe under Medicare Part D?
In 2024, Byung Don Ahn, MD had 7,253 Medicare Part D claims for 1,080 beneficiaries; the average among cardiovascular disease physician prescribers was 3,078. Part D covers Medicare prescriptions only.
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.