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Dr. Paul Chen, MD
NPI1588689350PAC ID5193756260
- Medicare services, 2024
- 364
- Medicare patients, 2024
- 133
- Part D claims, 2024
- 15,402
- Publications
- 1
- Industry payments
- $893
- Practice address
- 8110 Mango Ave, Fontana, CA 92335
- Practice phone
- Call (909) 427-1303
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Optum
Fontana, 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. Paul Chen is an internist in Fontana, California
Dr. Chen practices at Optum in Fontana, California.
Dr. Chen's NPI, 1588689350, was assigned on July 13, 2006. Dr. Chen graduated from George Washington University School of Medicine and Health Sciences in 2000. Dr. Chen holds California license A86154.
NPI and contact details
- NPI
- 1588689350NPI Registry (opens in a new tab)
- Medicare PAC ID
- 5193756260
- NPI enumeration date
- July 13, 2006
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Offers telehealth
- Yes
- Practice phone
- (909) 427-1303
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 52
- Medical school graduation
- 2000
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Practice Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. Paul Chen practices at Optum in Fontana, California
Dr. Chen's primary practice is Optum, at 8110 Mango Ave, Fontana, CA 92335 in San Bernardino County. The practice phone is (909) 427-1303.
- Optum8110 Mango Ave, Fontana, CA 92335 · San Bernardino CountyPhone(909) 427-1303
Sources: NPPES NPI Registry (CMS); and Dmand AI Practice Data
Dr. Paul Chen is affiliated with 4 sites of care and 3 medical groups
Dr. Chen's primary practice is Optum in Fontana, California. The medical group on file is Optum - Downtown Los Angeles. Dmand AI also links Dr. Chen to 3 more group practices and clinics and 2 medical groups, each named with a free account.
OptumPrimary
Sources: NPPES NPI Registry (CMS); Dmand AI Practice Data; and Dmand AI Affiliation Data
Dmand AI tracks the EHR system at Dr. Paul Chen's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Chen practices, 3 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Optum | Available with a free account |
| +3 more sites and 2 medical groups | Available with a free account |
Source: Dmand AI Technology Install Data
For health IT teams
See the EHR and IT leaders at every site where Dr. Chen practices
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Dr. Paul 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 New Jersey.
Specialties and state licenses
- Internal medicine, CaliforniaPrimary
- New Jersey license
Clinical focus
Dmand AI lists acid reflux, chronic anemia, chronic diabetes, chronic hypertension, chronic obstructive pulmonary disease (COPD), epilepsy, heart failure and high cholesterol 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. Paul Chen billed Medicare for 364 services in 2024
CMS data shows 364 Medicare services from Dr. Chen across 6 procedure codes in 2024, for 133 Medicare patients. Medicare paid $23,842 for them. Every service was in an office.
Medicare services, 2024364
Medicare patients133
Paid by Medicare$23,842
Procedure codes6
Dr. Chen's Medicare services by type, 2023 to 2024
- 2023
- 2024
- Office and hospital visits
- 2023: 2642024: 29713%
- Tests and treatments
- 2023: 592024: 4032%
- Other services
- 2023: 332024: 2718%
Dr. Chen compared with the California median for internists, 2024
- Dr. Chen
- California median
- Medicare services
- 364vs 361Close to median
- Medicare patients
- 133vs 15112% below
- Part D claims
- 14,478vs 42134.4 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.
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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. Paul Chen treated 133 Medicare patients in 2024, average age 72
CMS counts 133 Medicare patients who saw Dr. Chen in 2024. The largest group is 65 to 74, with 59 patients. 72% of them have high blood pressure, and 68% have high cholesterol. 80% are also on Medicaid. Their average risk score is 1.54, 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 66, with 55% women.
Medicare patients, 2024133
Average age72
Average risk score1.54
Also on Medicaid80%
Dr. Chen's Medicare patients by age, 2024
Dr. Chen's Medicare patients by sex, 2024
- Women8262%
- Men5138%
Chronic conditions among Dr. Chen's Medicare patients, 2024
- High blood pressure72%
- High cholesterol68%
- Diabetes49%
- Chronic kidney disease35%
- Arthritis32%
- Heart failure21%
- Ischemic heart disease15%
- Mood disorders14%
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 66
Patient panel by sex, all payers
- Women55%
- Men44%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Dr. Paul Chen wrote 15,402 Medicare Part D claims in 2024
In 2024, Dr. Chen wrote 15,402 Medicare Part D claims for 896 patients. 85% of them were for generic drugs. CMS names the drug for 14,478 of them, across 147 drugs with 11 or more claims each, at $970,704 in total drug cost. In 2023, CMS named 14,161 claims across 164 drugs.
Part D claims, 202415,402
Drugs named by CMS147
Total drug cost$970,704
Part D patients896
Dr. Chen's Part D claims by kind of drug, 2024
- Generic13,079 claims85%
- Brand-name1,954 claims13%
- Other369 claims2%
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
- Opioids3%461 of 15,402 claims
- Antibiotics1%184 of 15,402 claims
- Antipsychotics, patients 65 and over0%19 of 15,402 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: 14,1612024: 14,4782%
Drugs named by CMS: 147 in 2024, 164 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. Paul 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. Paul Chen has 1 publication on record
Dmand AI links 1 paper to Dr. Chen. Dr. Chen's most frequent co-authors are John Daniel Dobak, MD and Gregory K. Feld, MD.
Papers1
Dr. Chen's most frequent co-authors
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. Paul Chen received $893 in industry payments from 2016 to 2025
CMS Open Payments shows 19 general payments to Dr. Chen from 13 drug and device companies from 2016 to 2025. Food and beverage make up the largest share, 97% of the total. TissueTech, Inc. paid the most, $369.
General payments to Dr. Chen by program year, 2016 to 2025
General payments to Dr. Chen by kind, 2016 to 2025
$893in total
- Food and beverage$86397%
- Consulting fees$303%
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. Paul Chen graduated from George Washington University School of Medicine and Health Sciences
Dr. Chen graduated from George Washington University School of Medicine and Health Sciences in 2000.
- Medical school
Source: Dmand AI Professional Profile Data
Dr. Paul Chen accepts plans from 13 insurance carriers
Dr. Chen is in network with 13 carriers, including Aetna, United Healthcare and Blue Cross Blue Shield of Michigan. HMO plans come from the most carriers, 8. Check the plan with the practice before a visit.
- Aetna
- United Healthcare
- Blue Cross Blue Shield of Michigan
- Elevance
- HCSC
- Molina
- Alliant Health Plans
- Blue Cross and Blue Shield of Kansas City
- +5 more carriersWith a free account
Plan types Dr. Chen accepts, by number of carriers
- HMO8
- PPO7
- EPO4
- Medicare4
- POS3
Source: Dmand AI Insurance Network Data
Sources for Dr. Paul 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) |
| 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. Paul 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. Paul Chen's NPI number?
Dr. Paul Chen's NPI number is 1588689350. It was assigned on July 13, 2006, and it is active in the NPI Registry.
What kind of doctor is Dr. Paul Chen?
Dr. Paul Chen is an internist in Fontana, California. The primary specialty in the NPI Registry is Internal Medicine Physician (taxonomy code 207R00000X).
Where does Dr. Paul Chen practice?
Dr. Chen practices at 8110 Mango Ave, Fontana, CA 92335. Dr. Chen's primary practice is Optum in Fontana, California. Dmand AI also links Dr. Chen to 3 group practices and clinics and 2 medical groups.
What is Dr. Paul Chen's office phone number?
The practice phone on file for Dr. Chen is (909) 427-1303.
What is Dr. Paul Chen's medical license number?
Dr. Chen holds California license A86154, one of the licenses on file in 2 states.
Which states has Dr. Paul Chen been licensed in?
Dmand AI has state licenses on file for Dr. Chen in California (2004 to 2027) and New Jersey (1976 to 2017).
What medical group is Dr. Paul Chen part of?
Dr. Chen is linked to Optum - Downtown Los Angeles. Dmand AI links Dr. Chen to 2 more medical groups.
Does Dr. Paul Chen accept Medicare?
Yes. CMS data shows Dr. Chen billed Medicare for 364 services in 2024, and Dr. Chen accepts Medicare assignment.
Does Dr. Paul Chen offer telehealth?
Yes. The CMS Doctors and Clinicians file lists Dr. Chen as offering telehealth services.
How many Medicare patients does Dr. Paul Chen see?
CMS counts 133 Medicare patients who saw Dr. Chen in 2024, with an average age of 72.
Show 8 more questionsShow fewer questions
What services does Dr. Paul Chen bill to Medicare?
In 2024, Dr. Chen's most billed Medicare services were office visit, established patient (99214), office visit, established patient (99213) and care management and other visits (99441).
Where did Dr. Paul Chen go to medical school?
Dr. Chen graduated from George Washington University School of Medicine and Health Sciences in 2000.
What drugs does Dr. Paul Chen prescribe most?
In 2024 Medicare Part D data, Dr. Chen's most prescribed drugs by claims were Atorvastatin Calcium, Metformin HCl and Lisinopril.
Has Dr. Paul Chen received payments from drug or device companies?
CMS Open Payments shows $893 in general payments to Dr. Chen from 13 companies from 2016 to 2025. The largest total came from TissueTech, Inc.
How long has Dr. Paul Chen been practicing?
Dr. Chen graduated from medical school in 2000, 26 years ago.
Does Dr. Paul Chen do research?
Dmand AI links 1 publication to Dr. Chen.
Who does Dr. Paul Chen publish with?
Dr. Chen's most frequent co-authors are John Daniel Dobak, MD (1 shared paper) and Gregory K. Feld, MD (1 shared paper).
What insurance does Dr. Paul Chen accept?
Dr. Chen is in network with 13 carriers, including Aetna, United Healthcare and Blue Cross Blue Shield of Michigan. HMO plans come from the most carriers, 8. Check the plan with the practice before a visit.
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