Dr. Claire Thuc Duyen Diep, MD
- Medicare services, 2024
- 1,902
- Medicare patients, 2024
- 294
- Part D claims, 2024
- 5,044
- MIPS score, 2024
- 30
- Hospital affiliations
- 2
- Practice address
- 33509 Western Avenue, Union City, CA 94587
- Practice phone
- Call (510) 441-8081
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Claire T Diep MD Inc.
Physician office · Union City, California
Find Dr. Diep'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. Claire Thuc Duyen Diep is an internist in Union City, California
Dr. Diep practices at Claire T Diep MD Inc. in Union City, California.
Dr. Diep's NPI, 1366508707, was assigned on December 29, 2006. Dr. Diep graduated from Macon & Joan Brock Virginia Health Sciences Eastern Virginia Medical School in 1994. Dr. Diep's California license number on file is A55900.
- NPI
- 1366508707NPI Registry (opens in a new tab)
- Medicare PAC ID
- 2769424902
- NPI enumeration date
- December 29, 2006
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Offers telehealth
- Yes
- Practice phone
- (510) 441-8081
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Female
- Estimated age
- 58
- Medical school graduation
- 1994
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. Claire Thuc Duyen Diep practices at Claire T Diep MD Inc. in Union City, California
Dr. Diep's primary practice is Claire T Diep MD Inc., at 33509 Western Avenue, Union City, CA 94587. The practice phone is (510) 441-8081.
- Claire T Diep MD Inc.33509 Western Avenue, Union City, CA 94587Phone(510) 441-8081
Source: Dmand AI Affiliation Data
Dr. Claire Thuc Duyen Diep is affiliated with 3 sites of care
Dr. Diep's primary practice is Claire T Diep MD Inc. in Union City, California. Dr. Diep is also affiliated with Washington Health. Dmand AI also links Dr. Diep to 1 more hospital, named with a free account.
Source: Dmand AI Affiliation Data
Dmand AI tracks the EHR system at Dr. Claire Thuc Duyen Diep's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Diep practices, 3 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Claire T Diep MD Inc. | 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. Claire Thuc Duyen Diep is one of 16,751 internists in California
Internal medicine is Dr. Diep's primary specialty in the NPI Registry, under taxonomy code 207R00000X. Dr. Diep is board certified in internal medicine by the American Board of Internal Medicine. Dr. Diep has a license on file in California.
Specialties and state licenses
- Internal medicine, CaliforniaPrimary
Clinical focus
Dmand AI lists acid reflux, acute gastroduodenitis, acute skin infection, aneurysm, arteritis, arthritis, asthma and atrial fibrillation and flutter among the conditions Dr. Diep treats.
Internists near Dr. Diep
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. Claire Thuc Duyen Diep billed Medicare for 1,902 services in 2024
CMS data shows 1,902 Medicare services from Dr. Diep across 8 procedure codes in 2024, for 294 Medicare patients. Medicare paid $181,187 for them. Every service was in an office.
Dr. Diep's Medicare services by type, 2023 to 2024
- 2023
- 2024
- Office and hospital visits
- 2023: 1,4852024: 1,5333%
- Other services
- 2023: 1952024: 195No change
- Tests and treatments
- 2023: 1772024: 1742%
Dr. Diep compared with the California median for internists, 2024
- Dr. Diep
- California median
- Medicare services
- 1,902vs 3615.3 times
- Medicare patients
- 294vs 15195% above
- Part D claims
- 4,710vs 42111.2 times
Medians across 15,815 internists in California with Dmand AI profiles that report each measure.
Dr. Diep'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. Diep and other internists in California.
Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. Claire Thuc Duyen Diep treated 294 Medicare patients in 2024, average age 76
CMS counts 294 Medicare patients who saw Dr. Diep in 2024. The largest group is 65 to 74, with 129 patients. 75% of them have high blood pressure, and 75% have high cholesterol. 90% are also on Medicaid. Their average risk score is 1.09, where 1.00 is the Medicare average.
Across all payers, Dmand AI patient panel data puts Dr. Diep's median patient age at 69, with 69% women.
Dr. Diep's Medicare patients by age, 2024
CMS leaves out age groups with fewer than 11 patients.
Dr. Diep's Medicare patients by sex, 2024
- Women20670%
- Men8830%
Chronic conditions among Dr. Diep's Medicare patients, 2024
- High blood pressure75%
- High cholesterol75%
- Diabetes45%
- Osteoporosis35%
- Arthritis30%
- Chronic kidney disease23%
- Ischemic heart disease22%
- Heart failure15%
Share of Medicare patients with each condition. A patient can have several.
Dr. Diep's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 69
Patient panel by sex, all payers
- Women69%
- Men30%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Dr. Claire Thuc Duyen Diep wrote 5,044 Medicare Part D claims in 2024
In 2024, Dr. Diep wrote 5,044 Medicare Part D claims for 334 patients. 91% of them were for generic drugs. CMS names the drug for 4,710 of them, across 63 drugs with 11 or more claims each, at $380,305 in total drug cost. In 2023, CMS named 4,566 claims across 66 drugs.
Dr. Diep's Part D claims by kind of drug, 2024
- Generic4,586 claims91%
- Brand-name441 claims9%
- Other17 claims0%
Dr. Diep'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. Diep's Part D claims, 2024
- Opioids1%29 of 5,044 claims
- Antibiotics1%59 of 5,044 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: 4,5662024: 4,7103%
Drugs named by CMS: 63 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
Dr. Claire Thuc Duyen Diep scored 30 out of 100 in Medicare's MIPS program for 2024
CMS publishes a Merit-based Incentive Payment System (MIPS) score of 30 out of 100 for Dr. Diep for performance year 2024, reported individually. Dr. Diep accepts Medicare assignment, so Medicare's approved amount is taken as full payment. CMS lists Dr. Diep as offering telehealth.
- Accepts Medicare assignment
- Yes
- Offers telehealth
- Yes
Dr. Diep's MIPS scores, performance year 2024
- 30of 100Final score
- 0of 100Quality
- 0of 100Improvement Activities
- 98of 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. Claire Thuc Duyen Diep received $148 in industry payments from 2016 to 2022
CMS Open Payments shows 10 general payments to Dr. Diep from 4 drug and device companies from 2016 to 2022. Food and beverage make up the largest share, 100% of the total. Boehringer Ingelheim Pharmaceuticals, Inc. paid the most, $74.
General payments to Dr. Diep by program year, 2016 to 2022
Companies that paid Dr. Diep the most, 2016 to 2022
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Dr. Claire Thuc Duyen Diep graduated from Macon & Joan Brock Virginia Health Sciences Eastern Virginia Medical School
Dr. Diep graduated from Macon & Joan Brock Virginia Health Sciences Eastern Virginia Medical School in 1994.
- Medical school
- Board certified in internal medicine
Source: Dmand AI Professional Profile Data
Dr. Claire Thuc Duyen Diep accepts plans from 14 insurance carriers
Dr. Diep is in network with 14 carriers, including Aetna, Blue Cross Blue Shield of Michigan and United Healthcare. PPO plans come from the most carriers, 9. Check the plan with the practice before a visit.
- Aetna
- Blue Cross Blue Shield of Michigan
- United Healthcare
- Elevance
- HCSC
- Blue Cross Blue Shield of Massachusetts
- Regence Health Plans
- Alliant Health Plans
- +6 more carriersWith a free account
Plan types Dr. Diep accepts, by number of carriers
- PPO9
- Medicare7
- HMO6
- EPO4
- POS4
Source: Dmand AI Insurance Network Data
Sources for Dr. Claire Thuc Duyen Diep'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 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) |
| 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. Claire Thuc Duyen Diep
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. Claire Thuc Duyen Diep's NPI number?
Dr. Claire Thuc Duyen Diep's NPI number is 1366508707. It was assigned on December 29, 2006, and it is active in the NPI Registry.
What kind of doctor is Dr. Claire Thuc Duyen Diep?
Dr. Claire Thuc Duyen Diep is an internist in Union City, California. The primary specialty in the NPI Registry is Internal Medicine Physician (taxonomy code 207R00000X).
Where does Dr. Claire Thuc Duyen Diep practice?
Dr. Diep practices at 33509 Western Avenue, Union City, CA 94587. Dr. Diep's primary practice is Claire T Diep MD Inc. in Union City, California. Dmand AI also links Dr. Diep to 1 hospital.
What is Dr. Claire Thuc Duyen Diep's office phone number?
The practice phone on file for Dr. Diep is (510) 441-8081.
What is Dr. Claire Thuc Duyen Diep's medical license number?
Dr. Diep's California license number on file is A55900.
Which hospitals is Dr. Claire Thuc Duyen Diep affiliated with?
Dr. Diep is affiliated with Washington Health. Dmand AI links Dr. Diep to 1 more hospital.
Does Dr. Claire Thuc Duyen Diep accept Medicare?
Yes. CMS data shows Dr. Diep billed Medicare for 1,902 services in 2024, and Dr. Diep accepts Medicare assignment.
Does Dr. Claire Thuc Duyen Diep offer telehealth?
Yes. The CMS Doctors and Clinicians file lists Dr. Diep as offering telehealth services.
What is Dr. Claire Thuc Duyen Diep's MIPS score?
Dr. Diep's MIPS final score for performance year 2024 is 30 out of 100, reported individually.
How many Medicare patients does Dr. Claire Thuc Duyen Diep see?
CMS counts 294 Medicare patients who saw Dr. Diep in 2024, with an average age of 76.
Show 7 more questionsShow fewer questions
Is Dr. Claire Thuc Duyen Diep board certified?
Yes. Dr. Diep is board certified in internal medicine by the American Board of Internal Medicine.
What services does Dr. Claire Thuc Duyen Diep bill to Medicare?
In 2024, Dr. Diep's most billed Medicare services were office visit, established patient (99214), medicare service (G0008) and office visit, established patient (99213).
Where did Dr. Claire Thuc Duyen Diep go to medical school?
Dr. Diep graduated from Macon & Joan Brock Virginia Health Sciences Eastern Virginia Medical School in 1994.
What drugs does Dr. Claire Thuc Duyen Diep prescribe most?
In 2024 Medicare Part D data, Dr. Diep's most prescribed drugs by claims were Atorvastatin Calcium, Losartan Potassium and Amlodipine Besylate.
Has Dr. Claire Thuc Duyen Diep received payments from drug or device companies?
CMS Open Payments shows $148 in general payments to Dr. Diep from 4 companies from 2016 to 2022. The largest total came from Boehringer Ingelheim Pharmaceuticals, Inc.
How long has Dr. Claire Thuc Duyen Diep been practicing?
Dr. Diep graduated from medical school in 1994, 32 years ago.
What insurance does Dr. Claire Thuc Duyen Diep accept?
Dr. Diep is in network with 14 carriers, including Aetna, Blue Cross Blue Shield of Michigan and United Healthcare. PPO plans come from the most carriers, 9. Check the plan with the practice before a visit.
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