Dr. Derek T. Phan, MD
- Medicare services, 2020
- 23
- Part D claims, 2024
- 4,198
- Industry payments
- $1,361
- Affiliated sites
- 2
- Medical group
- 1
- Practice address
- 9191 Bolsa Ave, Westminster, CA 92683-5564
- Practice phone
- Call (714) 891-7035
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Derek Truong Phan MD Inc
Physician office · Westminster, California
Find Dr. Phan's professional email, personal email and mobile number
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Dr. Derek T. Phan is an internist in Westminster, California
Dr. Phan practices at Derek Truong Phan MD Inc in Westminster, California.
Dr. Phan's NPI, 1073729588, was assigned on May 14, 2007. Dr. Phan graduated from New York Medical College in 2005. Dr. Phan holds California license A99908.
- NPI
- 1073729588NPI Registry (opens in a new tab)
- Medicare PAC ID
- 1951451418
- NPI enumeration date
- May 14, 2007
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Practice phone
- (714) 891-7035
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 47
- Medical school graduation
- 2005
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. Derek T. Phan practices at Derek Truong Phan MD Inc in Westminster, California
Dr. Phan's primary practice is Derek Truong Phan MD Inc, at 9191 Bolsa Ave, Westminster, CA 92683-5564. The practice phone is (714) 891-7035.
- Derek Truong Phan MD Inc9191 Bolsa Ave, Westminster, CA 92683-5564Phone(714) 891-7035
Source: Dmand AI Affiliation Data
Dr. Derek T. Phan is affiliated with 2 sites of care and 1 medical group
Dr. Phan's primary practice is Derek Truong Phan MD Inc in Westminster, California. The medical group on file is Family Choice Medical Group. Dmand AI also links Dr. Phan to 1 more group practice or clinic, named with a free account.
Source: Dmand AI Affiliation Data
Dmand AI tracks the EHR system at Dr. Derek T. Phan's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Phan practices, 2 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Derek Truong Phan MD Inc | Available with a free account |
| +1 more affiliated site | Available with a free account |
Source: Dmand AI Technology Install Data
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Dr. Derek T. Phan is one of 16,751 internists in California
Internal medicine is Dr. Phan's primary specialty in the NPI Registry, under taxonomy code 207R00000X. Dr. Phan is licensed in California.
Specialties and state licenses
- Internal medicine, CaliforniaPrimary
Internists near Dr. Phan
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. Derek T. Phan billed Medicare for 23 services in 2020
CMS data shows 23 Medicare services from Dr. Phan across 1 procedure code in 2020, all of them office visits. Medicare paid $197 for them. Every service was in an office.
Dr. Phan's Medicare services by type, 2019 to 2020
- 2019
- 2020
- Office and hospital visits
- 2019: 1142020: 2380%
Dr. Phan compared with the California median for internists, 2020
- Dr. Phan
- California median
- Medicare services
- 23vs 36194% below
- Part D claims
- 3,666vs 4218.7 times
Medians across 15,815 internists in California with Dmand AI profiles that report each measure.
Dr. Phan's most billed Medicare procedure codes, 2020
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. Phan and other internists in California.
Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. Derek T. Phan's patients have a median age of 62
Across all payers, Dmand AI patient panel data puts Dr. Phan's median patient age at 62, with 54% women.
Dr. Phan's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 62
Patient panel by sex, all payers
- Women54%
- Men45%
Source: Dmand AI Patient Panel Data
Dr. Derek T. Phan wrote 4,198 Medicare Part D claims in 2024
In 2024, Dr. Phan wrote 4,198 Medicare Part D claims for 238 patients. 85% of them were for generic drugs. CMS names the drug for 3,666 of them, across 67 drugs with 11 or more claims each, at $459,430 in total drug cost. In 2023, CMS named 3,661 claims across 66 drugs.
Dr. Phan's Part D claims by kind of drug, 2024
- Generic3,568 claims85%
- Brand-name587 claims14%
- Other43 claims1%
Dr. Phan'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. Phan's Part D claims, 2024
- Opioids0%12 of 4,198 claims
- Antibiotics5%189 of 4,198 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: 3,6612024: 3,666No change
Drugs named by CMS: 67 in 2024, 66 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
How Dr. Derek T. Phan takes part in Medicare
Dr. Phan 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)
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Dr. Derek T. Phan received $1,361 in industry payments from 2016 to 2025
CMS Open Payments shows 40 general payments to Dr. Phan from 10 drug and device companies from 2016 to 2025. Food and beverage make up the largest share, 100% of the total. Merck Sharp & Dohme Corporation paid the most, $295.
General payments to Dr. Phan by program year, 2016 to 2025
Companies that paid Dr. Phan 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. Derek T. Phan graduated from New York Medical College
Dr. Phan graduated from New York Medical College in 2005.
- Medical school
Source: Dmand AI Professional Profile Data
Sources for Dr. Derek T. Phan'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 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 Data |
| 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) |
| Industry payments | Open Payments (CMS) (opens in a new tab) |
| Training, board certification and memberships | Dmand AI Professional Profile 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. Derek T. Phan
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. Derek T. Phan's NPI number?
Dr. Derek T. Phan's NPI number is 1073729588. It was assigned on May 14, 2007, and it is active in the NPI Registry.
What kind of doctor is Dr. Derek T. Phan?
Dr. Derek T. Phan is an internist in Westminster, California. The primary specialty in the NPI Registry is Internal Medicine Physician (taxonomy code 207R00000X).
Where does Dr. Derek T. Phan practice?
Dr. Phan practices at 9191 Bolsa Ave, Westminster, CA 92683-5564. Dr. Phan's primary practice is Derek Truong Phan MD Inc in Westminster, California. Dmand AI also links Dr. Phan to 1 group practice or clinic.
What is Dr. Derek T. Phan's office phone number?
The practice phone on file for Dr. Phan is (714) 891-7035.
What is Dr. Derek T. Phan's medical license number?
Dr. Phan holds California license A99908.
What medical group is Dr. Derek T. Phan part of?
Dr. Phan is linked to Family Choice Medical Group.
Does Dr. Derek T. Phan accept Medicare?
Yes. CMS data shows Dr. Phan billed Medicare for 23 services in 2020, and Dr. Phan accepts Medicare assignment.
What services does Dr. Derek T. Phan bill to Medicare?
In 2020, Dr. Phan's most billed Medicare services were office visit, established patient (99213).
Where did Dr. Derek T. Phan go to medical school?
Dr. Phan graduated from New York Medical College in 2005.
What drugs does Dr. Derek T. Phan prescribe most?
In 2024 Medicare Part D data, Dr. Phan's most prescribed drugs by claims were Amlodipine Besylate, Atorvastatin Calcium and Metformin HCl.
Has Dr. Derek T. Phan received payments from drug or device companies?
CMS Open Payments shows $1,361 in general payments to Dr. Phan from 10 companies from 2016 to 2025. The largest total came from Merck Sharp & Dohme Corporation.
How long has Dr. Derek T. Phan been practicing?
Dr. Phan graduated from medical school in 2005, 21 years ago.
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