Basuki K. Gunawan, M.D.
Internal Medicine Physician · Downey, CA
Basuki K. Gunawan, M.D. is an internal medicine physician with a practice address in Downey, California, and NPI 1346352473, issued on Aug 31, 2006. Check the license (California A78609, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Basuki K. Gunawan
- Credential
- M.D.
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- A78609 CA
Self-reported in NPPES; status is on the state search - Practice location
- 9353 Imperial Hwy, Downey, CA 90242
- Phone
- (562) 657-4292
- Enumerated
- Aug 31, 2006
- Record last updated
- Dec 21, 2021 (not updated in 5 years: call before relying on the address or phone)
- Medicare enrollment
- Enrolled (PECOS I20040617001538); accepts Medicare assignment
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 17,696 in California → Look up another NPI →
Also registered at 9353 Imperial Hwy
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Maria Theresa Ammermann, NPFamily Nurse Practitioner1750594131
- Rajeev Attam, MDGastroenterology Physician1184694309
- Bryan Ballard, PTPhysical Therapist1851515126
- Quennie Basa, PHYSICAL THERAPISTOrthopedic Physical Therapist1043415235
- Hilarie Beattie, PAPhysician Assistant1215053459
- Christie Blondek, PA-C,DMSC,MSPAS,MPHPhysician Assistant1376912311
Verify Basuki K. Gunawan in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A78609Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
67% fewer Medicare Part D claims than the average internal medicine physician in 2024
1,061 Medicare Part D claims for 607 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. Brand-name drugs were 7% of claims.
Most prescribed
- Gavilyte-C455 claims
- Omeprazole118 claims
- Mesalamine49 claims
- Carvedilol44 claims
- Entecavir39 claims
- Ursodiol39 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.
Bills Medicare through one group practice
- Southern California Permanente Medical GroupDowney, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Basuki K. Gunawan among 17,696 internal medicine physician records in California
Basuki K. Gunawan, M.D. 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 2006, is newer than 5% of them.
- NPI issued2006 · 5% of these records are older, 56% newer
- In a Medicare fileYes · 79% of these records are
- In the CMS Doctors and Clinicians fileYes · 63% of these records are
- Graduated1997 · median 2004 among the 11,065 with a school on file
- Record last updated2021 · 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).
114 internal medicine physician records list a practice address in Downey
They are 114 of the 3,607 NPPES records with a practice address in Downey, and 17,696 internal medicine physician records in California.
All 17,696 in California → Every provider in Downey → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- Sohail Afra, M.D.Downey, CA 902421023125176
- Ron Chai, M.D.Downey, CA 902421447361316
- Ronald Collins, M.D.Downey, CA 902421235176181
- Rashmi Desai, M.D.Downey, CA 902421801990247
- Danese Hayes, M.D.Downey, CA 902421689786733
- Goethe Hsu, M.D.Downey, CA 902421386656726
- Diana Hsu, M.D.Downey, CA 902421720090137
- Nageswari Krishnareddy, MDDowney, CA 902421780785873
Common questions
What is Basuki K. Gunawan, M.D.'s NPI number?
Basuki K. Gunawan, M.D.'s National Provider Identifier (NPI) is 1346352473, issued on Aug 31, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Basuki K. Gunawan, M.D. located?
The NPPES record lists a practice address at 9353 Imperial Hwy, Downey, CA, 90242. Phone: (562) 657-4292. Providers update this record themselves, so call before visiting.
How can I verify Basuki K. Gunawan, M.D.'s license?
NPPES lists California license number A78609, 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 Basuki K. Gunawan, M.D. prescribe under Medicare Part D?
In 2024, Basuki K. Gunawan, M.D. had 1,061 Medicare Part D claims for 607 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.