Hum Exp Toxicol
Dr. Ihong Chen, MD
- Medicare services, 2024
- 670
- Medicare patients, 2024
- 148
- Part D claims, 2024
- 5,955
- Publications
- 145
- Hospital affiliations
- 1
- Practice address
- 18035 Brookhurst St, Fountain Valley, CA 92708
- Practice phone
- Call (877) 696-3622
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Memorialcare Medical Foundation
Fountain Valley, California
Find Dr. Chen's professional email, personal email and mobile number
Dmand AI checks each channel through healthcare-specific waterfall enrichment. See what is on file with a free account, with practice phones, licenses and affiliations.
Dr. Ihong Chen is an internist in Fountain Valley, California
Dr. Chen practices at Memorialcare Medical Foundation in Fountain Valley, California.
Dr. Chen's NPI, 1104822535, was assigned on June 21, 2005. Dr. Chen graduated from Joe R. & Teresa Lozano Long School of Medicine in 1988. Dr. Chen holds California license A49721.
- NPI
- 1104822535NPI Registry (opens in a new tab)
- Medicare PAC ID
- 8022097880
- NPI enumeration date
- June 21, 2005
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Offers telehealth
- Yes
- Practice phone
- (877) 696-3622
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 64
- Medical school graduation
- 1988
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Practice Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. Ihong Chen practices at Memorialcare Medical Foundation in Fountain Valley, California
Dr. Chen's primary practice is Memorialcare Medical Foundation, at 18035 Brookhurst St, Fountain Valley, CA 92708 in Orange County. The practice phone is (877) 696-3622.
- Memorialcare Medical Foundation18035 Brookhurst St, Fountain Valley, CA 92708 · Orange CountyPhone(877) 696-3622
Sources: NPPES NPI Registry (CMS); and Dmand AI Practice Data
Dr. Ihong Chen is affiliated with 3 sites of care and 1 medical group
Dr. Chen's primary practice is Memorialcare Medical Foundation in Fountain Valley, California. Dr. Chen is also affiliated with Orange Coast Medical Center. The medical group on file is MemorialCare Medical Group. Dmand AI also links Dr. Chen to 1 more group practice or clinic, named with a free account.
Sources: NPPES NPI Registry (CMS); Dmand AI Practice Data; and Dmand AI Affiliation Data
Dmand AI tracks the EHR system at Dr. Ihong Chen's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Chen practices, 2 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Memorialcare Medical Foundation | Available with a free account |
| +2 more affiliated sites | Available with a free account |
Source: Dmand AI Technology Install Data
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Dr. Ihong Chen is one of 16,751 internists in California
Internal medicine is Dr. Chen's primary specialty in the NPI Registry, under taxonomy code 207R00000X. Dmand AI has Dr. Chen's licenses on file in 2 states: California and Texas.
Specialties and state licenses
- Internal medicine, CaliforniaPrimary
- Texas license
Clinical focus
Dmand AI lists acid reflux, arthritis, chronic anemia, chronic diabetes, chronic hypertension, chronic obstructive pulmonary disease (COPD), contact dermatitis and coronary artery disease among the conditions Dr. Chen treats.
Internists near Dr. Chen
Counts of internists with a Dmand AI profile, by place and practice. Each opens the list.
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; and Dmand AI Peer Benchmarks
Dr. Ihong Chen billed Medicare for 670 services in 2024
CMS data shows 670 Medicare services from Dr. Chen across 10 procedure codes in 2024, for 148 Medicare patients. Medicare paid $25,580 for them. Every service was in an office.
Dr. Chen's Medicare services by type, 2023 to 2024
- 2023
- 2024
- Office and hospital visits
- 2023: 3082024: 34111%
- Surgery
- 2023: 1542024: 1625%
- Other services
- 2023: 1302024: 14612%
- Tests and treatments
- 2023: 192024: 2111%
- Imaging
- 2023: 162024: 0100%
Dr. Chen compared with the California median for internists, 2024
- Dr. Chen
- California median
- Medicare services
- 670vs 36186% above
- Medicare patients
- 148vs 151Close to median
- Part D claims
- 5,286vs 42112.6 times
Medians across 15,815 internists in California with Dmand AI profiles that report each measure.
Dr. Chen's most billed Medicare procedure codes, 2024
CMS publishes codes billed for 11 or more Medicare patients. Each label is the code family; CPT descriptions are licensed by the AMA.
Need commercial claims for Dr. Chen?
Medicare shows one payer. Book a meeting to get commercial claims data for Dr. Chen and other internists in California.
Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. Ihong Chen treated 148 Medicare patients in 2024, average age 75
CMS counts 148 Medicare patients who saw Dr. Chen in 2024. The largest group is 65 to 74, with 72 patients. 75% of them have high cholesterol, and 72% have high blood pressure. Their average risk score is 1.18, where 1.00 is the Medicare average.
Across all payers, Dmand AI patient panel data puts Dr. Chen's median patient age at 63, with 50% women.
Dr. Chen's Medicare patients by age, 2024
CMS leaves out age groups with fewer than 11 patients.
Dr. Chen's Medicare patients by sex, 2024
- Women6745%
- Men8155%
Chronic conditions among Dr. Chen's Medicare patients, 2024
- High cholesterol75%
- High blood pressure72%
- Arthritis35%
- Chronic kidney disease26%
- Ischemic heart disease26%
- Diabetes24%
- Mood disorders19%
- Depression18%
Share of Medicare patients with each condition. A patient can have several.
Dr. Chen's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 63
Patient panel by sex, all payers
- Women50%
- Men49%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Dr. Ihong Chen wrote 5,955 Medicare Part D claims in 2024
In 2024, Dr. Chen wrote 5,955 Medicare Part D claims for 635 patients. 91% of them were for generic drugs. CMS names the drug for 5,286 of them, across 95 drugs with 11 or more claims each, at $245,192 in total drug cost. In 2023, CMS named 5,660 claims across 96 drugs.
Dr. Chen's Part D claims by kind of drug, 2024
- Generic5,442 claims91%
- Brand-name474 claims8%
- Other39 claims1%
Dr. Chen's most prescribed drugs by claims, 2024
CMS names a drug when it has 11 or more claims. Share is of the claims for drugs CMS names.
Drug classes CMS tracks in Dr. Chen's Part D claims, 2024
- Opioids1%40 of 5,955 claims
- Antibiotics3%183 of 5,955 claims
- Antipsychotics, patients 65 and over0%21 of 5,955 claims
Share of all Part D claims for each drug class CMS reports on. Classes with no claims are left out.
Part D claims for drugs CMS names, 2023 to 2024
- 2023
- 2024
- Claims for drugs CMS names
- 2023: 5,6602024: 5,2867%
Drugs named by CMS: 95 in 2024, 96 in 2023.
Sources: Medicare Part D Prescribers - by Provider and Drug (CMS), 2024 data, released May 6, 2026; and Medicare Part D Prescribers - by Provider (CMS), 2024 data
Dr. Ihong Chen offers telehealth to Medicare patients
Dr. Chen accepts Medicare assignment, so Medicare's approved amount is taken as full payment. CMS lists Dr. Chen as offering telehealth.
- Accepts Medicare assignment
- Yes
- Offers telehealth
- Yes
Source: Doctors and Clinicians National Downloadable File (CMS)
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Dr. Ihong Chen has 145 publications on record
Dmand AI links 145 papers to Dr. Chen, published from 2007 to 2012. 2007 was the busiest year, with 8. The most frequent topics are Molecular Structure, Plant Extracts and Plants, Medicinal. Dr. Chen has published most often in Planta Med. Dr. Chen's most frequent co-authors are Isan Chen, MD, Joseph D. Rosenblatt, MD and Peyman Banooni, MD.
Dr. Chen's papers by year, 2007 to 2012
Topics Dr. Chen writes about most
- Molecular Structure
- Plant Extracts
- Plants, Medicinal
- Antineoplastic Agents, Phytogenic
- Plant Roots
- Taiwan
- Tumor Cells, Cultured
- Magnetic Resonance Spectroscopy
Dr. Chen's most frequent co-authors
- Isan Chen, MD39 shared papers
- Joseph D. Rosenblatt, MD4 shared papers
- Peyman Banooni, MD1 shared paper
Recent publications by Dr. Chen
See who Dr. Chen researches with
Physician Network Discovery turns co-authorship, shared hospitals and shared groups into a map of who Dr. Chen works with, so you can find a warm path to the right internists.
Sources: PubMed (National Library of Medicine); and Dmand AI Research Linkage
Dr. Ihong Chen received $683 in industry payments from 2016 to 2025
CMS Open Payments shows 36 general payments to Dr. Chen from 15 drug and device companies from 2016 to 2025. Food and beverage make up the largest share, 100% of the total. Pfizer Inc. paid the most, $172.
General payments to Dr. Chen by program year, 2016 to 2025
Companies that paid Dr. Chen the most, 2016 to 2025
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Dr. Ihong Chen has 1 award and honors on record
Dmand AI lists 1 award for Dr. Chen, most recently CMS Stage 1 EHR in 2013.
Awards and honors for Dr. Chen
- 2013
- CMS Stage 1 EHR
Source: Dmand AI Professional Profile Data
Dr. Ihong Chen graduated from Joe R. & Teresa Lozano Long School of Medicine
Dr. Chen graduated from Joe R. & Teresa Lozano Long School of Medicine in 1988. Dr. Chen is a member of ACP.
- Medical school
Source: Dmand AI Professional Profile Data
Dr. Ihong Chen accepts plans from 14 insurance carriers
Dr. Chen is in network with 14 carriers, including Aetna, Elevance and United Healthcare. PPO plans come from the most carriers, 9. Check the plan with the practice before a visit.
- Aetna
- Elevance
- United Healthcare
- Blue Cross Blue Shield of Michigan
- HCSC
- Humana
- Blue Cross Blue Shield of Massachusetts
- Regence Health Plans
- +6 more carriersWith a free account
Plan types Dr. Chen accepts, by number of carriers
- PPO9
- HMO7
- Medicare7
- POS5
- EPO4
Source: Dmand AI Insurance Network Data
Sources for Dr. Ihong Chen's profile data
| Data on this page | Source |
|---|---|
| NPI, name, sex, specialty and licenses | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Professional Profile Data |
| Practice locations and phone | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Practice Data |
| Primary practice, affiliations and health system | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Practice DataDmand AI Affiliation Data |
| Medicare services and procedure codes | Medicare Physician & Other Practitioners - by Provider and Service (CMS) (opens in a new tab) |
| State medians for the same specialty | Dmand AI Peer Benchmarks |
| Medicare patients and the all-payer patient panel | Dmand AI Patient Panel DataMedicare Physician & Other Practitioners - by Provider (CMS) (opens in a new tab) |
| Part D prescribing | Medicare Part D Prescribers - by Provider and Drug (CMS) (opens in a new tab)Medicare Part D Prescribers - by Provider (CMS) (opens in a new tab) |
| MIPS scores, telehealth, assignment and procedure percentiles | Doctors and Clinicians National Downloadable File (CMS) (opens in a new tab) |
| Publications, topics and co-authors | PubMed (National Library of Medicine) (opens in a new tab)Dmand AI Research Linkage |
| Industry payments | Open Payments (CMS) (opens in a new tab) |
| Awards and committee roles | Dmand AI Professional Profile Data |
| Training, board certification and memberships | Dmand AI Professional Profile Data |
| Insurance carriers and plan types | Dmand AI Insurance Network Data |
| EHR at each practice site | Dmand AI Technology Install Data |
| Similar physicians | Dmand AI Affiliation Data |
Data last refreshed October 2026Report an inaccuracyRemove my information
FAQ
Frequently asked questions about Dr. Ihong Chen
Spotted something out of date? Email hello@dmand.ai and we will check the record. Contact details live in the free trial.
What is Dr. Ihong Chen's NPI number?
Dr. Ihong Chen's NPI number is 1104822535. It was assigned on June 21, 2005, and it is active in the NPI Registry.
What kind of doctor is Dr. Ihong Chen?
Dr. Ihong Chen is an internist in Fountain Valley, California. The primary specialty in the NPI Registry is Internal Medicine Physician (taxonomy code 207R00000X).
Where does Dr. Ihong Chen practice?
Dr. Chen practices at 18035 Brookhurst St, Fountain Valley, CA 92708. Dr. Chen's primary practice is Memorialcare Medical Foundation in Fountain Valley, California. Dmand AI also links Dr. Chen to 1 group practice or clinic.
What is Dr. Ihong Chen's office phone number?
The practice phone on file for Dr. Chen is (877) 696-3622.
What is Dr. Ihong Chen's medical license number?
Dr. Chen holds California license A49721, one of the licenses on file in 2 states.
Which states has Dr. Ihong Chen been licensed in?
Dmand AI has state licenses on file for Dr. Chen in California (1991 to 2027) and Texas (1989 to 2018).
Which hospitals is Dr. Ihong Chen affiliated with?
Dr. Chen is affiliated with Orange Coast Medical Center.
What medical group is Dr. Ihong Chen part of?
Dr. Chen is linked to MemorialCare Medical Group.
Does Dr. Ihong Chen accept Medicare?
Yes. CMS data shows Dr. Chen billed Medicare for 670 services in 2024, and Dr. Chen accepts Medicare assignment.
Does Dr. Ihong Chen offer telehealth?
Yes. The CMS Doctors and Clinicians file lists Dr. Chen as offering telehealth services.
Show 9 more questionsShow fewer questions
How many Medicare patients does Dr. Ihong Chen see?
CMS counts 148 Medicare patients who saw Dr. Chen in 2024, with an average age of 75.
What services does Dr. Ihong Chen bill to Medicare?
In 2024, Dr. Chen's most billed Medicare services were office visit, established patient (99214), surgery: heart and blood vessels (36415) and care management and other visits (99497).
Where did Dr. Ihong Chen go to medical school?
Dr. Chen graduated from Joe R. & Teresa Lozano Long School of Medicine in 1988.
What drugs does Dr. Ihong Chen prescribe most?
In 2024 Medicare Part D data, Dr. Chen's most prescribed drugs by claims were Losartan Potassium, Atorvastatin Calcium and Amlodipine Besylate.
Has Dr. Ihong Chen received payments from drug or device companies?
CMS Open Payments shows $683 in general payments to Dr. Chen from 15 companies from 2016 to 2025. The largest total came from Pfizer Inc.
How long has Dr. Ihong Chen been practicing?
Dr. Chen graduated from medical school in 1988, 38 years ago.
Does Dr. Ihong Chen do research?
Dmand AI links 145 publications to Dr. Chen, published from 2007 to 2012.
Who does Dr. Ihong Chen publish with?
Dr. Chen's most frequent co-authors are Isan Chen, MD (39 shared papers), Joseph D. Rosenblatt, MD (4 shared papers) and Peyman Banooni, MD (1 shared paper).
What insurance does Dr. Ihong Chen accept?
Dr. Chen is in network with 14 carriers, including Aetna, Elevance and United Healthcare. PPO plans come from the most carriers, 9. Check the plan with the practice before a visit.
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