Ihong Chen, MD
Internal Medicine Physician · Fountain Valley, CA
Ihong Chen, MD is an internal medicine physician with a practice address in Fountain Valley, California, and NPI 1104822535, issued on Jun 21, 2005. Check the license (California A49721, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Ihong Chen
- Credential
- MD
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- A49721 CA
Self-reported in NPPES; status is on the state search - Practice location
- 18785 Brookhurst St., Suite 200, Fountain Valley, CA 92708
- Phone
- (714) 378-5330
- Enumerated
- Jun 21, 2005
- Record last updated
- Jun 12, 2026
- Fax
- (657) 276-4743
- Medicare enrollment
- Enrolled (PECOS I20040715000631); accepts Medicare assignment
- Medical or professional school
- University Of Texas Medical School At San Antonio, 1988
- 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 18785 Brookhurst St., Suite 200
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Lalita Komanapalli, MDInternal Medicine Physician1578560884
- Maria Silvia Martinez-Wikefeldt, M.D.Pediatrics Physician1164554846
- John Wang, M.D.Internal Medicine Physician1720048291
- Margaret Zimmerman, MDPediatrics Physician1073502282
Verify Ihong Chen in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A49721Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
88% more Medicare Part D claims than the average internal medicine physician in 2024
5,955 Medicare Part D claims for 635 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. Brand-name drugs were 8% of claims. 40 claims were for opioids.
Most prescribed
- Losartan Potassium654 claims
- Atorvastatin Calcium505 claims
- Amlodipine Besylate444 claims
- Metoprolol Succinate189 claims
- Levothyroxine Sodium179 claims
- Metformin Hcl Er152 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
- Memorialcare Medical FoundationFountain Valley, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Ihong Chen among 17,696 internal medicine physician records in California
Ihong Chen, 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 2005, is newer than 0% of them.
- NPI issued2005 · 0% of these records are older, 95% newer
- In a Medicare fileYes · 79% of these records are
- In the CMS Doctors and Clinicians fileYes · 63% of these records are
- Graduated1988 · median 2004 among the 11,065 with a school on file
- Record last updated2026 · 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).
83 internal medicine physician records list a practice address in Fountain Valley
They are 83 of the 2,190 NPPES records with a practice address in Fountain Valley, and 17,696 internal medicine physician records in California.
All 17,696 in California → Every provider in Fountain Valley → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- Joel Bartlett, MDFountain Valley, CA 927081073518791
- Naomi Cheung, MDFountain Valley, CA 927081073503314
- Alan Dang, M.D.Fountain Valley, CA 927081043217359
- Alton ForanFountain Valley, CA 927081619968799
- George Hong, MDFountain Valley, CA 927081154328532
- Brandon Khaw, MDFountain Valley, CA 927081568453637
- Lalita Komanapalli, MDFountain Valley, CA 927081578560884
- Barbara Lever, MDFountain Valley, CA 927081083611230
Common questions
What is Ihong Chen, MD's NPI number?
Ihong Chen, MD's National Provider Identifier (NPI) is 1104822535, issued on Jun 21, 2005. An NPI identifies a provider in billing; it is not a license.
Where is Ihong Chen, MD located?
The NPPES record lists a practice address at 18785 Brookhurst St., Suite 200, Fountain Valley, CA, 92708. Phone: (714) 378-5330. Providers update this record themselves, so call before visiting.
How can I verify Ihong Chen, MD's license?
NPPES lists California license number A49721, 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 Ihong Chen, MD prescribe under Medicare Part D?
In 2024, Ihong Chen, MD had 5,955 Medicare Part D claims for 635 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.