Billy Zhang, MD
Internal Medicine Physician · Irvine, CA
Billy Zhang, MD is an internal medicine physician with a practice address in Irvine, California, and NPI 1871087957, issued on Jun 21, 2018. Check the license (California A173835, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Billy Zhang
- Credential
- MD
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License numbers
- A173835 CA
312109 NY
MT216737 PA
Self-reported in NPPES; status is on the state search - Practice location
- 13400 Jamboree RD, Irvine, CA 92602
- Phone
- (714) 263-9279
- Enumerated
- Jun 21, 2018
- Record last updated
- Aug 7, 2023
- Medicare enrollment
- Enrolled (PECOS I20230817001011); accepts Medicare assignment
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 17,696 in California → Look up another NPI →
Also registered at 13400 Jamboree RD
A shared address usually means a shared clinic or building; it does not show who employs whom.
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- Summer Walker, PA-CPhysician Assistant1912604307
Verify Billy Zhang in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A173835Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
68% fewer Medicare Part D claims than the average internal medicine physician in 2024
1,010 Medicare Part D claims for 219 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. Brand-name drugs were 21% of claims. 13 claims were for opioids.
Most prescribed
- Atorvastatin Calcium59 claims
- Ozempic37 claims
- Gabapentin36 claims
- Rosuvastatin Calcium33 claims
- Amlodipine Besylate28 claims
- Levothyroxine Sodium28 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: $306.44
15 payments; by number, the most common kind was food and beverage; the largest payer was Novo Nordisk Inc. The 50,334 providers of this specialty with any payment received $1,303.06 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 one group practice
- Providence Medical FoundationFullerton, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Billy Zhang among 17,696 internal medicine physician records in California
Billy Zhang, MD is one of 17,696 internal medicine physician records with a practice address in California. 79% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2018, is newer than 84% of them.
- NPI issued2018 · 84% of these records are older, 14% newer
- In a Medicare fileYes · 79% of these records are
- In the CMS Doctors and Clinicians fileYes · 63% of these records are
- Graduated2017 · median 2004 among the 11,065 with a school on file
- Record last updated2023 · 61% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207R00000X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
155 internal medicine physician records list a practice address in Irvine
They are 155 of the 7,778 NPPES records with a practice address in Irvine, and 17,696 internal medicine physician records in California.
All 17,696 in California → Every provider in Irvine → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
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- Robert KaarenIrvine, CA 926031275465403
- Soroosh Mashayekh, M.D.Irvine, CA 926031417139205
Common questions
What is Billy Zhang, MD's NPI number?
Billy Zhang, MD's National Provider Identifier (NPI) is 1871087957, issued on Jun 21, 2018. An NPI identifies a provider in billing; it is not a license.
Where is Billy Zhang, MD located?
The NPPES record lists a practice address at 13400 Jamboree RD, Irvine, CA, 92602. Phone: (714) 263-9279. Providers update this record themselves, so call before visiting.
How can I verify Billy Zhang, MD's license?
NPPES lists California license number A173835, 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 Billy Zhang, MD prescribe under Medicare Part D?
In 2024, Billy Zhang, MD had 1,010 Medicare Part D claims for 219 beneficiaries; the average among internal medicine physician prescribers was 3,176. 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.