ArthritisConnective Tissue DiseasesHearing Loss, Sensorineural
Dr. Timothy Chen, MD
NPI1821617259PAC ID4789005760
- Medicare services, 2024
- 13
- Medicare patients, 2024
- 45
- Part D claims, 2024
- 156
- Publications
- 1
- Hospital affiliations
- 1
- Practice address
- 101 City Drive South, Orange, CA 92868
- Practice phone
- Call (714) 456-7890
- 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. Timothy Chen is an ophthalmologist in Orange, California
Dr. Chen practices at UCI Health - Orange in Orange, California, part of UC Irvine.
Dr. Chen's NPI, 1821617259, was assigned on April 15, 2020. Dr. Chen graduated from Vagelos College of Physicians and Surgeons in 2020. Dr. Chen holds California license 194317.
NPI and contact details
- NPI
- 1821617259NPI Registry (opens in a new tab)
- Medicare PAC ID
- 4789005760
- NPI enumeration date
- April 15, 2020
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Practice phone
- (714) 456-7890
- 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. Timothy Chen practices at UCI Health - Orange in Orange, California
Dr. Chen's primary practice is UCI Health - Orange, at 101 City Drive South, Orange, CA 92868 in Orange County. The practice phone is (714) 456-7890.
- UCI Health - Orange101 City Drive South, Orange, CA 92868 · Orange CountyPhone(714) 456-7890
Source: Dmand AI Affiliation Data
Dr. Timothy Chen is affiliated with 1 site of care and 1 medical group
Dr. Chen's primary practice is UCI Health - Orange in Orange, California, part of UC Irvine. Dmand AI also links Dr. Chen to 1 medical group, named with a free account.
Sources: Dmand AI Affiliation Data; and Dmand AI Org Hierarchy Data
Dmand AI tracks the EHR system at Dr. Timothy Chen's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Chen practices. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| UCI Health - Orange | Available with a free account |
| +1 medical group | Available with a free account |
Source: Dmand AI Technology Install Data
For health IT teams
See the EHR and IT leaders at every hospital where Dr. Chen practices
Dmand AI maps EHR vendors, IT decision makers and buying committees across UC Irvine and 6.2K+ hospitals, with verified contacts in the same login.
Dr. Timothy Chen is one of 2,621 ophthalmologists in California
Ophthalmology is Dr. Chen's primary specialty in the NPI Registry, under taxonomy code 207W00000X. Dr. Chen is board certified in ophthalmology by the American Board of Ophthalmology. Dmand AI has Dr. Chen's licenses on file in 2 states: California and New Mexico.
Specialties and state licenses
- Ophthalmology, CaliforniaPrimary
- New Mexico license
Ophthalmologists near Dr. Chen
Counts of ophthalmologists with a Dmand AI profile, by place and practice. Each opens the list.
2,621ophthalmologists in California32ophthalmologists in Orange17ophthalmologists at UCI Health - Orange
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; and Dmand AI Peer Benchmarks
Dr. Timothy Chen billed Medicare for 13 services in 2024
CMS data shows 13 Medicare services from Dr. Chen across 1 procedure code in 2024, for 45 Medicare patients. Medicare paid $271 for them. Every service was in a facility, such as a hospital, rather than an office.
Medicare services, 202413
Medicare patients45
Paid by Medicare$271
Procedure codes1
Dr. Chen compared with the California median for ophthalmologists, 2024
- Dr. Chen
- California median
- Medicare services
- 13vs 1,07999% below
- Medicare patients
- 45vs 42189% below
- Part D claims
- 74vs 61888% below
Medians across 2,568 ophthalmologists 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 ophthalmologists in California.
Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. Timothy Chen treated 45 Medicare patients in 2024, average age 72
CMS counts 45 Medicare patients who saw Dr. Chen in 2024. The largest group is 65 to 74, with 24 patients. 75% of them have high blood pressure, and 75% have high cholesterol. 31% are also on Medicaid. Their average risk score is 2.39, 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 61, with 46% women.
Medicare patients, 202445
Average age72
Average risk score2.39
Also on Medicaid31%
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
- Women2044%
- Men2556%
Chronic conditions among Dr. Chen's Medicare patients, 2024
- High blood pressure75%
- High cholesterol75%
- Arthritis49%
- Diabetes40%
- Chronic kidney disease33%
- Mood disorders29%
- Depression27%
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 61
Patient panel by sex, all payers
- Women46%
- Men53%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Dr. Timothy Chen wrote 156 Medicare Part D claims in 2024
In 2024, Dr. Chen wrote 156 Medicare Part D claims for 82 patients. 58% of them were for generic drugs. CMS names the drug for 74 of them, across 4 drugs with 11 or more claims each, at $1,580 in total drug cost.
Part D claims, 2024156
Drugs named by CMS4
Total drug cost$1,580
Part D patients82
Dr. Chen's Part D claims by kind of drug, 2024
- Generic91 claims58%
- Brand-name65 claims42%
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.
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
How Dr. Timothy Chen takes part in Medicare
Dr. Chen accepts Medicare assignment, so Medicare's approved amount is taken as full payment.
- Accepts Medicare assignment
- Yes
Source: Doctors and Clinicians National Downloadable File (CMS)
For MedTech and pharma teams
Find ophthalmologists like Dr. Chen by procedure volume and prescribing
Filter 7.4M+ HCPs by Medicare procedures, Part D drugs and Open Payments history, then reach them with verified contacts in one login.
Dr. Timothy Chen has 1 publication on record
Dmand AI links 1 paper to Dr. Chen in 2024. Dr. Chen's most frequent co-author is Joseph N. Martel.
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 ophthalmologists.
Sources: PubMed (National Library of Medicine); and Dmand AI Research Linkage
Dr. Timothy Chen received $2,756 in industry payments from 2024 to 2025
CMS Open Payments shows 21 general payments to Dr. Chen from 8 drug and device companies from 2024 to 2025. Food and beverage make up the largest share, 62% of the total. Alcon Laboratories Inc paid the most, $1,307.
General payments to Dr. Chen by program year, 2024 to 2025
General payments to Dr. Chen by kind, 2024 to 2025
$2.8Kin total
- Food and beverage$1,71462%
- Travel and lodging$1,04238%
Companies that paid Dr. Chen the most, 2024 to 2025
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Dr. Timothy Chen graduated from Vagelos College of Physicians and Surgeons
Dr. Chen graduated from Vagelos College of Physicians and Surgeons in 2020.
- Medical school
- Board certified in ophthalmology
Source: Dmand AI Professional Profile Data
Dr. Timothy Chen accepts plans from 9 insurance carriers
Dr. Chen is in network with 9 carriers, including Blue Cross Blue Shield of Michigan, United Healthcare and Blue Cross Blue Shield of Massachusetts. Medicare plans come from the most carriers, 6. Check the plan with the practice before a visit.
- Blue Cross Blue Shield of Michigan
- United Healthcare
- Blue Cross Blue Shield of Massachusetts
- HCSC
- Regence Health Plans
- Aetna
- CMS Medicare
- Elevance
- +1 more carriersWith a free account
Plan types Dr. Chen accepts, by number of carriers
- Medicare6
- PPO6
- HMO4
- POS2
Source: Dmand AI Insurance Network Data
Sources for Dr. Timothy 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) |
| 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. Timothy 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. Timothy Chen's NPI number?
Dr. Timothy Chen's NPI number is 1821617259. It was assigned on April 15, 2020, and it is active in the NPI Registry.
What kind of doctor is Dr. Timothy Chen?
Dr. Timothy Chen is an ophthalmologist in Orange, California. The primary specialty in the NPI Registry is Ophthalmology Physician (taxonomy code 207W00000X).
Where does Dr. Timothy Chen practice?
Dr. Chen practices at 101 City Drive South, Orange, CA 92868. Dr. Chen's primary practice is UCI Health - Orange in Orange, California, part of UC Irvine. Dmand AI also links Dr. Chen to 1 medical group.
What is Dr. Timothy Chen's office phone number?
The practice phone on file for Dr. Chen is (714) 456-7890.
What is Dr. Timothy Chen's medical license number?
Dr. Chen holds California license 194317, one of the licenses on file in 2 states.
Which states has Dr. Timothy Chen been licensed in?
Dmand AI has state licenses on file for Dr. Chen in California (2024 to 2026) and New Mexico (2023 to 2024).
Which hospitals is Dr. Timothy Chen affiliated with?
Dr. Chen practices at UCI Health - Orange in Orange, California.
Does Dr. Timothy Chen accept Medicare?
Yes. CMS data shows Dr. Chen billed Medicare for 13 services in 2024, and Dr. Chen accepts Medicare assignment.
How many Medicare patients does Dr. Timothy Chen see?
CMS counts 45 Medicare patients who saw Dr. Chen in 2024, with an average age of 72.
Is Dr. Timothy Chen board certified?
Yes. Dr. Chen is board certified in ophthalmology by the American Board of Ophthalmology.
Show 8 more questionsShow fewer questions
What services does Dr. Timothy Chen bill to Medicare?
In 2024, Dr. Chen's most billed Medicare services were eye exam or test (92134).
Where did Dr. Timothy Chen go to medical school?
Dr. Chen graduated from Vagelos College of Physicians and Surgeons in 2020.
What drugs does Dr. Timothy Chen prescribe most?
In 2024 Medicare Part D data, Dr. Chen's most prescribed drugs by claims were Prednisolone Acetate, Ketorolac Tromethamine and Dorzolamide-Timolol.
Has Dr. Timothy Chen received payments from drug or device companies?
CMS Open Payments shows $2,756 in general payments to Dr. Chen from 8 companies from 2024 to 2025. The largest total came from Alcon Laboratories Inc.
How long has Dr. Timothy Chen been practicing?
Dr. Chen graduated from medical school in 2020, 6 years ago.
Does Dr. Timothy Chen do research?
Dmand AI links 1 publication to Dr. Chen.
Who does Dr. Timothy Chen publish with?
Dr. Chen's most frequent co-authors are Joseph N. Martel (1 shared paper).
What insurance does Dr. Timothy Chen accept?
Dr. Chen is in network with 9 carriers, including Blue Cross Blue Shield of Michigan, United Healthcare and Blue Cross Blue Shield of Massachusetts. Medicare plans come from the most carriers, 6. Check the plan with the practice before a visit.
Selling to ophthalmology practices?
See ophthalmologists in California by site of care and group
Find the practices, groups and hospitals they work with, and the right people to contact at each.
- 30 days free
- Self-serve
- No credit card