Liwanag Asuncion, M.D.
Internal Medicine Physician · Ontario, CA
Liwanag Asuncion, M.D. is an internal medicine physician with a practice address in Ontario, California, and NPI 1437122082, issued on Feb 13, 2006. Check the license (California C158496, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Liwanag Asuncion
- Credential
- M.D.
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License numbers
- C158496 CA
35034771 OH
Self-reported in NPPES; status is on the state search - Practice location
- 606 E Bermuda Dunes St, Ontario, CA 91761
- Phone
- (440) 225-7095
- Enumerated
- Feb 13, 2006
- Record last updated
- Jun 3, 2020 (not updated in 6 years: call before relying on the address or phone)
- Fax
- (909) 295-9100
- Medicaid IDs
- 0204817 OH
3025372 OH - Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 17,696 in California → Look up another NPI →
Verify Liwanag Asuncion in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license C158496Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
98% fewer Medicare Part D claims than the average internal medicine physician in 2024
58 Medicare Part D claims for 18 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. Brand-name drugs were 19% of claims.
Most prescribed
- Azithromycin16 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.
Liwanag Asuncion among 17,696 internal medicine physician records in California
Liwanag Asuncion, 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 fileNo · 63% of these records are
- Record last updated2020 · 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).
Internal Medicine Physician providers in California
There are 17,696 internal medicine physician records in California.
All 17,696 in California → Every provider in Ontario → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- David Hirota, M.D.Ontario, CA 917611699735191
- Dianne Quintana, M.D.Ontario, CA 917611386083780
- Rodman St. Clair, M.D.Ontario, CA 917611275788630
- Sujay DayalOntario, CA 917621740920966
- Mohammed Al-Khayyat, M.D.Montclair, CA 917631588195424
- Sadia Khan, MDMontclair, CA 917631225271125
- George Moran, MDMontclair, CA 917631639673635
- Kiandokht Partovi, M.D.Montclair, CA 917631689763427
Common questions
What is Liwanag Asuncion, M.D.'s NPI number?
Liwanag Asuncion, M.D.'s National Provider Identifier (NPI) is 1437122082, issued on Feb 13, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Liwanag Asuncion, M.D. located?
The NPPES record lists a practice address at 606 E Bermuda Dunes St, Ontario, CA, 91761. Phone: (440) 225-7095. Providers update this record themselves, so call before visiting.
How can I verify Liwanag Asuncion, M.D.'s license?
NPPES lists California license number C158496, 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 Liwanag Asuncion, M.D. prescribe under Medicare Part D?
In 2024, Liwanag Asuncion, M.D. had 58 Medicare Part D claims for 18 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.