Joseph Byung Hoon An, MD
Internal Medicine Physician · Sacramento, CA
Joseph Byung Hoon An, MD is an internal medicine physician with a practice address in Sacramento, California, and NPI 1649910654, issued on Mar 29, 2022. Check the license (California A202356, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Joseph Byung Hoon An
- Credential
- MD
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License numbers
- A202356 CA
0101280507 VA
Self-reported in NPPES; status is on the state search - Practice location
- 4610 X St Ste 4202, Sacramento, CA 95817
- Phone
- (167) 036-7569
- Enumerated
- Mar 29, 2022
- Record last updated
- Aug 31, 2025
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 17,696 in California → Look up another NPI →
Also registered at 4610 X St Ste 4202
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Guy Elgar, MDThoracic Surgery (Cardiothoracic Vascular Surgery) Physician1851194914
- Kaylan GriffithStudent in an Organized Health Care Education/Training Program1164151783
- Sirisha Iruvanti, DOPsychiatry Physician1710552054
- Michael Lung, MDStudent in an Organized Health Care Education/Training Program1154061729
- Amrita Mahesh, DO, MSCNephrology Physician1518462621
- Lavinia Mihaila, MDNeonatal-Perinatal Medicine Physician1073198230
Verify Joseph Byung Hoon An in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A202356Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
96% fewer Medicare Part D claims than the average internal medicine physician in 2024
126 Medicare Part D claims for 23 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. Brand-name drugs were 12% of claims.
Most prescribed
- Atorvastatin Calcium21 claims
- Losartan Potassium11 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: $22.00
1 payment: food and beverage; the largest payer was Takeda Pharmaceuticals U.S.A., 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.
Joseph Byung Hoon An among 17,696 internal medicine physician records in California
Joseph Byung Hoon An, 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 2022, is newer than 95% of them.
- NPI issued2022 · 95% of these records are older, 2% newer
- In a Medicare fileYes · 79% of these records are
- In the CMS Doctors and Clinicians fileNo · 63% of these records are
- Record last updated2025 · 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).
601 internal medicine physician records list a practice address in Sacramento
They are 601 of the 33,083 NPPES records with a practice address in Sacramento, and 17,696 internal medicine physician records in California.
All 17,696 in California → Every provider in Sacramento → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- Nelson Chiang, M.D.Sacramento, CA 958171326021494
- Robert Derlet, MDSacramento, CA 958171902887433
- Lynne Do, M.D.Sacramento, CA 958171386627644
- Jason Ferries, M.D.Sacramento, CA 958171609859974
- Steven Griffen, M.D.Sacramento, CA 958171053393835
- Diane Haddock, M.D.Sacramento, CA 958171013991553
- Calvin Hirsch, MDSacramento, CA 958171073597332
- Hershan Johl, MDSacramento, CA 958171255314399
Common questions
What is Joseph Byung Hoon An, MD's NPI number?
Joseph Byung Hoon An, MD's National Provider Identifier (NPI) is 1649910654, issued on Mar 29, 2022. An NPI identifies a provider in billing; it is not a license.
Where is Joseph Byung Hoon An, MD located?
The NPPES record lists a practice address at 4610 X St Ste 4202, Sacramento, CA, 95817. Phone: (167) 036-7569. Providers update this record themselves, so call before visiting.
How can I verify Joseph Byung Hoon An, MD's license?
NPPES lists California license number A202356, 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 Joseph Byung Hoon An, MD prescribe under Medicare Part D?
In 2024, Joseph Byung Hoon An, MD had 126 Medicare Part D claims for 23 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.