Dr. Harrison Chen, DO
- Medicare services, 2024
- 1,616
- Medicare patients, 2024
- 445
- Part D claims, 2024
- 322
- Publications
- 3
- MIPS score, 2024
- 95
- Practice address
- 300 W Huntington Dr, Arcadia, CA 91007
- Practice phone
- Call (626) 898-8000
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
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. Harrison Chen is an internist in Arcadia, California
Dr. Chen practices at USC Arcadia Hospital in Arcadia, California, part of University of Southern California.
Dr. Chen's NPI, 1841829793, was assigned on April 3, 2020. Dr. Chen holds California license 20A19990.
- NPI
- 1841829793NPI Registry (opens in a new tab)
- Medicare PAC ID
- 5698139020
- NPI enumeration date
- April 3, 2020
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Practice phone
- (626) 898-8000
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 32
- Medical school graduation
- 2020
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. Harrison Chen practices at USC Arcadia Hospital in Arcadia, California
Dr. Chen's primary practice is USC Arcadia Hospital, at 300 W Huntington Dr, Arcadia, CA 91007 in Los Angeles County. The practice phone is (626) 898-8000.
- USC Arcadia Hospital300 W Huntington Dr, Arcadia, CA 91007 · Los Angeles CountyPhone(626) 898-8000
Source: Dmand AI Affiliation Data
Dr. Harrison Chen is affiliated with 4 sites of care and 3 medical groups
Dr. Chen's primary practice is USC Arcadia Hospital in Arcadia, California, part of University of Southern California. Dr. Chen is also affiliated with Providence Little Company of Mary Medical Center Torrance. The medical group on file is Arcadia Hospitalist Medical Group. Dmand AI also links Dr. Chen to 2 more hospitals and 2 medical groups, each named with a free account.
Sources: Dmand AI Affiliation Data; and Dmand AI Org Hierarchy Data
Dmand AI tracks the EHR system at Dr. Harrison Chen's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Chen practices, 4 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| USC Arcadia Hospital | Available with a free account |
| +3 more sites and 2 medical groups | Available with a free account |
Source: Dmand AI Technology Install Data
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Dr. Harrison 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. Dr. Chen is licensed in California.
Specialties and state licenses
- Internal medicine, CaliforniaPrimary
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. Harrison Chen billed Medicare for 1,616 services in 2024
CMS data shows 1,616 Medicare services from Dr. Chen across 4 procedure codes in 2024, for 445 Medicare patients. Medicare paid $147,899 for them. Every service was in a facility, such as a hospital, rather than an office.
Dr. Chen's Medicare services by type, 2023 to 2024
- 2023
- 2024
- Office and hospital visits
- 2023: 5332024: 1,616203%
Dr. Chen compared with the California median for internists, 2024
- Dr. Chen
- California median
- Medicare services
- 1,616vs 3614.5 times
- Medicare patients
- 445vs 1512.9 times
- Part D claims
- 114vs 42173% below
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.
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Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. Harrison Chen treated 445 Medicare patients in 2024, average age 78
CMS counts 445 Medicare patients who saw Dr. Chen in 2024. The largest group is 85 and over, with 153 patients. 75% of them have high blood pressure, and 75% have high cholesterol. 63% are also on Medicaid. Their average risk score is 2.75, where 1.00 is the Medicare average, so they are sicker than most Medicare patients.
Across all payers, Dmand AI patient panel data puts Dr. Chen's median patient age at 63, with 54% women.
Dr. Chen's Medicare patients by age, 2024
Dr. Chen's Medicare patients by sex, 2024
- Women22751%
- Men21849%
Chronic conditions among Dr. Chen's Medicare patients, 2024
- High blood pressure75%
- High cholesterol75%
- Arthritis59%
- Diabetes59%
- Chronic kidney disease53%
- Ischemic heart disease51%
- Heart failure50%
- COPD40%
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
- Women54%
- Men46%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Dr. Harrison Chen wrote 322 Medicare Part D claims in 2024
In 2024, Dr. Chen wrote 322 Medicare Part D claims for 129 patients. 90% of them were for generic drugs. CMS names the drug for 114 of them, across 8 drugs with 11 or more claims each, at $2,131 in total drug cost.
Dr. Chen's Part D claims by kind of drug, 2024
- Generic291 claims90%
- Brand-name and other31 claims10%
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
- Opioids6%19 of 322 claims
- Antibiotics39%126 of 322 claims
Share of all Part D claims for each drug class CMS reports on. Classes with no claims are left out.
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. Harrison Chen scored 95 out of 100 in Medicare's MIPS program for 2024
CMS publishes a Merit-based Incentive Payment System (MIPS) score of 95 out of 100 for Dr. Chen for performance year 2024, reported as part of a group. Dr. Chen accepts Medicare assignment, so Medicare's approved amount is taken as full payment.
- Accepts Medicare assignment
- Yes
Dr. Chen's MIPS scores, performance year 2024
- 95of 100Final score
- 40of 100Improvement Activities
- 69of 100Cost
Each score is out of 100. The final score weighs the categories CMS scored for this clinician.
Sources: Doctors and Clinicians National Downloadable File (CMS); and Clinician Public Reporting: Overall MIPS Performance (CMS), 2024 data, released September 10, 2026
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Dr. Harrison Chen has 3 publications on record
Dmand AI links 3 papers to Dr. Chen, published from 2014 to 2017. Dr. Chen's most frequent co-authors are Reza Ardehali, MD, PhD, James Elliott Bradner, MD and Tzung Z. Hsiai, MD.
Dr. Chen's papers by year, 2014 to 2017
Dr. Chen's most frequent co-authors
- Reza Ardehali, MD, PhD1 shared paper
- James Elliott Bradner, MD1 shared paper
- Tzung Z. Hsiai, 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. Harrison Chen received $284 in industry payments from 2023 to 2025
CMS Open Payments shows 8 general payments to Dr. Chen from 4 drug and device companies from 2023 to 2025. Food and beverage make up the largest share, 100% of the total. Boston Scientific Corporation paid the most, $157.
General payments to Dr. Chen by program year, 2023 to 2025
Companies that paid Dr. Chen the most, 2023 to 2025
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Sources for Dr. Harrison 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 | Dmand AI Affiliation Data |
| Primary practice, affiliations and health system | Dmand AI Affiliation DataDmand AI Org Hierarchy 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)Clinician Public Reporting: Overall MIPS Performance (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) |
| 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. Harrison 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. Harrison Chen's NPI number?
Dr. Harrison Chen's NPI number is 1841829793. It was assigned on April 3, 2020, and it is active in the NPI Registry.
What kind of doctor is Dr. Harrison Chen?
Dr. Harrison Chen is an internist in Arcadia, California. The primary specialty in the NPI Registry is Internal Medicine Physician (taxonomy code 207R00000X).
Where does Dr. Harrison Chen practice?
Dr. Chen practices at 300 W Huntington Dr, Arcadia, CA 91007. Dr. Chen's primary practice is USC Arcadia Hospital in Arcadia, California, part of University of Southern California. Dmand AI also links Dr. Chen to 2 hospitals and 2 medical groups.
What is Dr. Harrison Chen's office phone number?
The practice phone on file for Dr. Chen is (626) 898-8000.
What is Dr. Harrison Chen's medical license number?
Dr. Chen holds California license 20A19990.
Which hospitals is Dr. Harrison Chen affiliated with?
Dr. Chen practices at USC Arcadia Hospital in Arcadia, California. Dr. Chen is also affiliated with Providence Little Company of Mary Medical Center Torrance. Dmand AI links Dr. Chen to 2 more hospitals.
What medical group is Dr. Harrison Chen part of?
Dr. Chen is linked to Arcadia Hospitalist Medical Group. Dmand AI links Dr. Chen to 2 more medical groups.
Does Dr. Harrison Chen accept Medicare?
Yes. CMS data shows Dr. Chen billed Medicare for 1,616 services in 2024, and Dr. Chen accepts Medicare assignment.
What is Dr. Harrison Chen's MIPS score?
Dr. Chen's MIPS final score for performance year 2024 is 95 out of 100, reported as part of a group.
How many Medicare patients does Dr. Harrison Chen see?
CMS counts 445 Medicare patients who saw Dr. Chen in 2024, with an average age of 78.
Show 6 more questionsShow fewer questions
What services does Dr. Harrison Chen bill to Medicare?
In 2024, Dr. Chen's most billed Medicare services were hospital inpatient care (99233), hospital inpatient care (99239) and care management and other visits (99497).
What drugs does Dr. Harrison Chen prescribe most?
In 2024 Medicare Part D data, Dr. Chen's most prescribed drugs by claims were Amoxicillin-Clavulanate Potass, Prednisone and Doxycycline Hyclate.
Has Dr. Harrison Chen received payments from drug or device companies?
CMS Open Payments shows $284 in general payments to Dr. Chen from 4 companies from 2023 to 2025. The largest total came from Boston Scientific Corporation.
How long has Dr. Harrison Chen been practicing?
Dr. Chen graduated from medical school in 2020, 6 years ago.
Does Dr. Harrison Chen do research?
Dmand AI links 3 publications to Dr. Chen, published from 2014 to 2017.
Who does Dr. Harrison Chen publish with?
Dr. Chen's most frequent co-authors are Reza Ardehali, MD, PhD (1 shared paper), James Elliott Bradner, MD (1 shared paper) and Tzung Z. Hsiai, MD (1 shared paper).
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