Dr. Than Nguyen , DO
Internal Medicine β’ Berkeley, CA
2850 Telegraph Ave Ste 130
Berkeley, CA 947051159
This profile restates public CMS/NPPES data; T-MedInfo gives no medical advice — consult a licensed professional, and call 911 for emergencies.
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NPI assigned on May 24, 2012; this date does not establish years in practice.
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Published CMS data list 853 Medicare Part D prescriptions, including refills, in 2024.
Source: CMS, Medicare Part D Prescribers β by Provider and Drug, 2024. Published rows only; this is not a quality measure.
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Published Part D records, 2024:
- Gavilyte-C (Peg3350/Sod Sulf,bicarb,cl/Kcl) β 368 prescription fills, including refills.
- Pantoprazole Sodium β 153 prescription fills, including refills.
- Omeprazole β 87 prescription fills, including refills.
Source: CMS, Medicare Part D Prescribers β by Provider and Drug, 2024. Drug names come from pharmacy claims. Listing a drug here is not an endorsement or a recommendation.
See all 15 records in the table Β· Guide: How to read Medicare Part D prescriber data
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Fewer Part D prescriptions than 60% of clinicians listed under Internal Medicine in Berkeley, CA (2024, 34 clinicians with data). Median for this group: 1,571. Middle half: 335 to 3,529.
Close to the middle for Part D prescriptions among clinicians listed under Internal Medicine in California (2024, 10,856 clinicians with data). Median for this group: 1,234. Middle half: 145 to 4,216.
Source: CMS, Medicare Part D Prescribers β by Provider and Drug, 2024. Billing and prescribing volume is not a quality rating.
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Medicare Part D prescriptions went from 368 in 2020 to 853 in 2024.
Source: CMS, Medicare Part D Prescribers β by Provider and Drug, 2020β2024.
Practice Location & Contact Primary Location
2850 Telegraph Ave Ste 130
Berkeley, CA 947051159
Matched by practice address or phone in NPPES. A shared address or phone does not confirm that this clinician works there.
NPPES lists 1 additional practice-address record in Farmington Hills, MI. See the list
Source: CMS NPPES NPI Registry, practice location records; release date unavailable.
CMS Doctors and Clinicians lists 1 group name: Sutter Bay Medical Foundation. See the list
Source: CMS Doctors and Clinicians National Downloadable File, CMS release of October 2, 2026.
Listings do not confirm current availability, employment or a shared ownership network.
Medicare Profile & Education
Source: CMS Doctors and Clinicians National Downloadable File, CMS release of October 2, 2026
Lake Erie College Of Osteopathic Medicine, Erie
2012
What Public CMS Data Show
Internal Medicine: NPPES taxonomy is a reported classification, not proof of board certification.
30-day fills
1,177 standardized 30-day fills in 2024
CMS converts prescriptions to 30-day supplies so they can be compared. A 90-day prescription counts as about three 30-day fills.
What this does not show: 30-day fills
It is not a count of patients and not a measure of quality.
Part D drug cost
$37,287 in 2024
The total cost of these prescriptions in 2024, paid by Medicare drug plans, patients and other payers together.
It shows the total spending on drugs this clinician prescribed, not what any one patient paid.
What this does not show: Part D drug cost
A higher cost often reflects the type of medicines a specialty uses. It is not your out-of-pocket cost and not a measure of quality.
Source: CMS, Medicare Part D Prescribers β by Provider and Drug, 2024.
Open Payments general payments, program year 2025
All general payments: $185.06 across 6 records.
By nature of payment
- Food and Beverage: $185.06 across 6 records.
Reporting-company totals (3 largest of 4)
- Janssen Pharmaceuticals, Inc: $65.72 across 2 records.
- ABBVIE INC.: $49.39 across 2 records.
- Biosense Webster, Inc.: $48.75 across 1 record.
A reported payment does not necessarily mean the financial relationship is improper and is not a measure of care quality. Clinicians can review and dispute these records.
Source: Calculated by T-MedInfo from CMS Open Payments general-payment records for program year 2025 (published June 30, 2026).
Years since graduation
14 years (graduated 2012)
CMS Doctors and Clinicians data list 2012 as the year this clinician finished professional school.
It tells you roughly how long ago the clinician finished school.
What this does not show: Years since graduation
It is not the number of years in practice, and more years does not mean better care.
Source: CMS Doctors and Clinicians National Downloadable File, CMS release of October 2, 2026.
NPI first issued
2012
The year this clinician's National Provider Identifier (NPI) was issued. An NPI is a unique 10-digit ID that US health care providers use for billing.
What this does not show: NPI first issued
NPIs have been issued only since 2005, so this year is not necessarily when the clinician started practicing.
Source: CMS NPPES NPI Registry.
Accepts Medicare assignment
CMS data list this clinician as accepting Medicare assignment. This means agreeing to take the Medicare-approved amount as full payment for covered services.
With Original Medicare, you usually pay only your deductible and coinsurance, and the office sends the claim to Medicare for you.
Medicare assignment applies to Original Medicare. It does not tell you whether the clinician is in a Medicare Advantage plan's network, accepts other insurance, or is taking new patients.
Source: CMS Doctors and Clinicians, CMS release of October 2, 2026; Medicare.gov, βDoes your provider accept Medicare as full payment?β
Telehealth (some services)
Recent Medicare claims show this clinician provided some services by telehealth, such as a video or phone visit.
You may be able to have some visits without going to the office. Ask which visits can be done by telehealth.
What this does not show: Telehealth (some services)
It does not mean all services are offered by telehealth, or that telehealth is covered by your plan.
Source: CMS, Telehealth Indicator on Medicare Care Compare (fact sheet, January 2023); CMS Doctors and Clinicians, CMS release of October 2, 2026.
Enrolled in Medicare (PECOS)
Dr. Nguyen has a Medicare enrollment record in PECOS, the CMS system clinicians use to enroll so they can bill Medicare or order services for people with Medicare.
It does not show whether the clinician accepts assignment, is in your plan's network, or is taking new patients.
Source: CMS Medicare Fee-For-Service Public Provider Enrollment (PECOS); CMS Order and Referring file.
Can order Medicare-covered services
CMS lists Dr. Nguyen as eligible to order or refer Medicare Part B clinical laboratory and imaging services, durable medical equipment (DME) and home health services for people with Medicare.
Medicare pays for these items and services only when they are ordered by an eligible clinician.
What this does not show: Can order Medicare-covered services
It does not mean the clinician offers these services directly.
Source: CMS Medicare Fee-For-Service Public Provider Enrollment (PECOS); CMS Order and Referring file.
Compared with the same specialty in Berkeley and California
Billing and prescribing volume is not a quality rating.
Medicare Part D prescriptions
Fewer Part D prescriptions than 60% of clinicians listed under Internal Medicine in Berkeley, CA (2024, 34 clinicians with data). Median for this group: 1,571. Middle half: 335 to 3,529.
Close to the middle for clinicians listed under Internal Medicine in California (2024, 10,856 clinicians with data). Median for this group: 1,234. Middle half: 145 to 4,216.
Part D drug cost
Close to the middle for clinicians listed under Internal Medicine in Berkeley, CA (2024, 34 clinicians with data). Median for this group: $49,822. Middle half: $15,254 to $200,817.
Close to the middle for clinicians listed under Internal Medicine in California (2024, 10,856 clinicians with data). Median for this group: $86,595. Middle half: $7,293 to $305,458.
83 active clinicians are listed under Internal Medicine with a practice address in Berkeley, CA (17,897 in California).
Addresses are self-reported to NPPES and may be out of date.
Telehealth indicator in Berkeley
19.3% of these 83 clinicians have the CMS telehealth indicator.
37.3% of these 83 clinicians are listed by CMS as accepting Medicare assignment.
CMS data by year
Changes may reflect reporting, coverage or privacy limits, not changes in care quality.
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Medicare Part D prescriptions
Medicare Part D prescriptions increased 132% from 368 in 2020 to 853 in 2024.
- 2020: 368
- 2021: 494
- 2022: 540
- 2023: 603
- 2024: 853
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30-day fills
30-day fills increased 190% from 406 in 2020 to 1,177 in 2024.
- 2020: 406
- 2021: 627
- 2022: 668
- 2023: 792
- 2024: 1,177
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Part D drug cost
Part D drug cost decreased 24% from $48,876 in 2020 to $37,287 in 2024.
- 2020: $48,876
- 2021: $64,790
- 2022: $9,679
- 2023: $20,257
- 2024: $37,287
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Industry payments (Open Payments)
Industry payments (Open Payments) went from $14.84 in 2019 to $185.06 in 2025.
- 2019: $14.84
- 2020: $27.27
- 2021: $16.75
- 2024: $181.72
- 2025: $185.06
Sources: CMS Medicare Part D Prescribers (2024), CMS Open Payments (2025), CMS Doctors and Clinicians, CMS release of October 2, 2026, CMS NPPES NPI Registry. Specialty names follow the NUCC Health Care Provider Taxonomy.
Text: T-MedInfo Β· Report an error.
Pharma & Medical Device Financial Disclosures
Payments and other transfers of value that drug and medical device companies reported to CMS Open Payments
Program year 2025 (payments made January 1 β December 31, 2025): fewer than 11 records totaling $185.06.
| Manufacturer | Payment Nature | Product | Type | Amount ($) |
|---|---|---|---|---|
| Biosense Webster, Inc. |
Food and Beverage
In-kind items and services
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CARTO 3 | General | $48.75 |
| Janssen Pharmaceuticals, Inc |
Food and Beverage
In-kind items and services
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TREMFYA | General | $37.56 |
| ABBVIE INC. |
Food and Beverage
In-kind items and services
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SKYRIZI | General | $29.46 |
| Janssen Pharmaceuticals, Inc |
Food and Beverage
In-kind items and services
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TREMFYA | General | $28.16 |
| Pfizer Inc. |
Food and Beverage
In-kind items and services
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VELSIPITY | General | $21.20 |
| ABBVIE INC. |
Food and Beverage
In-kind items and services
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RINVOQ | General | $19.93 |
Source: CMS Open Payments, program year 2025, released June 30, 2026.
Medicare Part D Prescribing Profile & Medications
Medicare Part D prescriptions filled, including refills, in 2024.
| Brand Name | Generic Name | Prescriptions | Day Supply | Total Cost | Patients |
|---|---|---|---|---|---|
| Gavilyte-C | Peg3350/Sod Sulf,bicarb,cl/Kcl | 368 | 600 | $8,494.15 | 358 |
| Pantoprazole Sodium | Pantoprazole Sodium | 153 | 7,320 | $1,761.77 | 45 |
| Omeprazole | Omeprazole | 87 | 3,230 | $1,121.70 | 27 |
| Famotidine | Famotidine | 35 | 3,050 | $455.97 | 13 |
| Mesalamine | Mesalamine | 33 | 2,527 | $18,993.45 | β |
| Cholestyramine | Cholestyramine (With Sugar) | 31 | 923 | $1,350.46 | 15 |
| Azathioprine | Azathioprine | 24 | 1,637 | $605.24 | β |
| Budesonide Dr | Budesonide | 21 | 884 | $1,527.48 | β |
| Dicyclomine Hcl | Dicyclomine Hcl | 19 | 432 | $335.05 | 11 |
| Ondansetron Hcl | Ondansetron Hcl | 16 | 134 | $102.43 | 12 |
| Sucralfate | Sucralfate | 15 | 480 | $666.30 | β |
| Lubiprostone | Lubiprostone | 14 | 515 | $1,254.85 | β |
| Carvedilol | Carvedilol | 13 | 530 | $100.32 | β |
| Entecavir | Entecavir | 13 | 810 | $238.37 | β |
| Spironolactone | Spironolactone | 11 | 950 | $279.53 | β |
Source: CMS Part D by Provider and Drug, 2024; rows below 11 claims omitted by CMS; volume isn’t quality. Privacy limits
Specialties & License Numbers Reported to NPPES
Self-certified to NPPES: 2025-11-20NUCC Taxonomy Code: 207R00000X
A physician who provides long-term, comprehensive care in the office and the hospital, managing both common and complex illness of adolescents, adults and the elderly. Internists are trained in the diagnosis and treatment of cancer, infections and diseases affecting the heart, blood, kidneys, joints and digestive, respiratory and vascular systems. They are also trained in the essentials of primary care internal medicine, which incorporates an understanding of disease prevention, wellness, substance abuse, mental health and effective treatment of common problems of the eyes, ears, skin, nervous system and reproductive organs.
NUCC Taxonomy Code: 207RG0100X
An internist who specializes in diagnosis and treatment of diseases of the digestive organs including the stomach, bowels, liver and gallbladder. This specialist treats conditions such as abdominal pain, ulcers, diarrhea, cancer and jaundice and performs complex diagnostic and therapeutic procedures using endoscopes to visualize internal organs.
Medicare (PECOS) Enrollment & Ordering Eligibility
Source: CMS PECOSPRACTITIONER - INTERNAL MEDICINE
I20190122000929
CA
5698068583
Sources: CMS Provider Enrollment and Order and Referring. Medicare enrollment is a billing status, not an accreditation or quality rating.
Medicare Group Practice Enrollments
Source: CMS Doctors and Clinicians National Downloadable File, CMS release of October 2, 2026
Sutter Bay Medical Foundation
20101 Lake Chabot Rd, Castro Valley, CA 945465305
Phone: 5108863400
Sutter Bay Medical Foundation
20103 Lake Chabot Rd, Castro Valley, CA 945465305
Phone: 5107273256
Sutter Bay Medical Foundation
2450 Ashby Ave, Berkeley, CA 947052067
Phone: 5102044444
Sutter Bay Medical Foundation
2450 Ashby Ave, Berkeley, CA 947052067
Sutter Bay Medical Foundation
2850 Telegraph Ave, Berkeley, CA 947051159
Sutter Bay Medical Foundation
3200 Kearney St, Fremont, CA 945382299
Phone: 5104901222
Secondary Practice Locations
28050 Grand River Ave
Farmington Hills, MI 483365919
Phone: 2484718224
Clinicians Sharing This Practice Address or Phone
Clinicians sharing this NPPES address, phone or fax; a shared contact does not mean they work together.
Psychiatry & Neurology - Neurology
Doctor of Medicine (M.D.)
Surgery - Surgical Oncology
Doctor of Medicine (M.D.)
Psychiatry & Neurology - Neurology
Doctor of Osteopathic Medicine (D.O.)
Psychiatry & Neurology - Neurology
Doctor of Medicine (M.D.)
Nurse Practitioner
Nurse Practitioner
Physician Assistant
Physician Assistant (Certified)
Career & Practice History Timeline
Changes recorded in monthly NPPES data files: addresses, names, credentials, specialties and NPI status
Registered at 2850 TELEGRAPH AVE STE 130, BERKELEY, CA 947051159 (Tel: 5102048120)
Additional practice office at 28050 Grand River Ave, Farmington Hills, MI 483365919
Internal Medicine (license number reported to NPPES: CA 20A15824)
NPI status registered as active in NPPES database
Registered at 28050 GRAND RIVER AVE, FARMINGTON HILLS, MI 483365919 (Tel: 2484718224)
Registered at 28050 GRAND RIVER AVE, FARMINGTON HILLS, MI 483365919
Recorded as THAN NGUYEN, D.O.
Internal Medicine (license number reported to NPPES: MI L2226995)
First registered as active Individual Practitioner in NPPES Database.
NPI Administrative Meta
Other Internal Medicine Providers in Berkeley
- Jessica Liu
- Dr. Jessica Furer, MD
- Dr. Pardis Poorzand, MD
- Dr. Julie Omelveny, MD
- Dr. Floyd Huen, MD
- Dr. Lori Mouratoff, MD
Mailing Address
28050 Grand River Ave
Farmington Hills, MI 483365919