Dr. James Warren , DDS
Dentist - General Practice • Millbrae, CA
453 Broadway
Millbrae, CA 940301905
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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Dr. James Warren is listed in NPPES under Dentist - General Practice.
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NPI assigned on July 22, 2015; this date does not establish years in practice.
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Published CMS data list 13 Medicare Part D prescriptions, including refills, in 2023.
Source: CMS, Medicare Part D Prescribers – by Provider and Drug, 2023. Published rows only; this is not a quality measure.
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Published Part D records, 2023:
- Amoxicillin — 13 prescription fills, including refills.
Source: CMS, Medicare Part D Prescribers – by Provider and Drug, 2023. Drug names come from pharmacy claims. Listing a drug here is not an endorsement or a recommendation.
See the full table · Guide: How to read Medicare Part D prescriber data
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Medicare Part D prescriptions went from 11 in 2017 to 13 in 2023.
Source: CMS, Medicare Part D Prescribers – by Provider and Drug, 2017–2023.
Practice Location & Contact Primary Location
453 Broadway
Millbrae, CA 940301905
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 San Mateo, CA. See the list
Source: CMS NPPES NPI Registry, practice location records; release date unavailable.
Listings do not confirm current availability, employment or a shared ownership network.
What Public CMS Data Show
Dentist - General Practice: NPPES taxonomy is a reported classification, not proof of board certification.
30-day fills
13 standardized 30-day fills in 2023
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
$58 in 2023
The total cost of these prescriptions in 2023, 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 – by Provider and Drug, 2023.
Open Payments general payments, program year 2025
All general payments: $1,035.62 across 16 records.
By nature of payment
- Education: $675.00 across 9 records.
- Food and Beverage: $360.62 across 7 records.
Reporting-company totals (3 largest of 4)
- Straumann USA LLC: $634.00 across 7 records.
- Align Technology, Inc.: $199.84 across 6 records.
- ZIMVIE INC.: $184.86 across 2 records.
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).
NPI first issued
2015
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.
Medicare assignment not listed
CMS data do not show whether this clinician accepts Medicare assignment. This does not mean they do not accept Medicare. Ask the office.
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; Medicare.gov, “Does your provider accept Medicare as full payment?”
No telehealth indicator
CMS shows this indicator only when recent Medicare claims include telehealth services. The clinician may still offer telehealth; ask the office.
Source: CMS, Telehealth Indicator on Medicare Care Compare (fact sheet, January 2023); CMS Doctors and Clinicians.
Enrolled in Medicare (PECOS)
Dr. Warren 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. Warren 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 Millbrae and California
Billing and prescribing volume is not a quality rating.
Medicare Part D
Comparisons use 2024 data. The latest CMS data for Dr. Warren are from 2023.
18 active clinicians are listed under Dentist - General Practice with a practice address in Millbrae, CA (17,862 in California).
Addresses are self-reported to NPPES and may be out of date.
Telehealth indicator in Millbrae
0% of these 18 clinicians have the CMS telehealth indicator.
0% of these 18 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 went from 11 in 2017 to 13 in 2023.
- 2017: 11
- 2023: 13
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30-day fills
30-day fills went from 11 in 2017 to 13 in 2023.
- 2017: 11
- 2023: 13
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Part D drug cost
Part D drug cost went from $38 in 2017 to $58 in 2023.
- 2017: $38
- 2023: $58
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Industry payments (Open Payments)
Industry payments (Open Payments) went from $47.53 in 2021 to $1,035.62 in 2025.
- 2021: $47.53
- 2022: $70.22
- 2023: $990.85
- 2024: $50.52
- 2025: $1,035.62
Sources: CMS Medicare Part D Prescribers (2023), CMS Open Payments (2025), CMS Doctors and Clinicians, CMS NPPES NPI Registry. Specialty names follow the NUCC Health Care Provider Taxonomy.
Text: T-MedInfo · 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 – December 31, 2025): 16 records totaling $1,035.62.
| Manufacturer | Payment Nature | Product | Type | Amount ($) |
|---|---|---|---|---|
| Straumann USA LLC |
Education
In-kind items and services
|
— | General | $150.00 |
| Straumann USA LLC |
Education
In-kind items and services
|
— | General | $150.00 |
| Straumann USA LLC |
Food and Beverage
In-kind items and services
|
— | General | $110.81 |
| Straumann USA LLC |
Education
In-kind items and services
|
— | General | $100.00 |
| ZIMVIE INC. |
Food and Beverage
In-kind items and services
|
TSX Implants | General | $93.78 |
| ZIMVIE INC. |
Food and Beverage
In-kind items and services
|
TSX Implants | General | $91.08 |
| Align Technology, Inc. |
Education
Cash or cash equivalent
|
Invisalign | General | $50.00 |
| Straumann USA LLC |
Education
In-kind items and services
|
— | General | $50.00 |
| Align Technology, Inc. |
Education
Cash or cash equivalent
|
Invisalign | General | $50.00 |
| Align Technology, Inc. |
Education
Cash or cash equivalent
|
Invisalign | General | $50.00 |
| Straumann USA LLC |
Education
In-kind items and services
|
— | General | $50.00 |
| Align Technology, Inc. |
Education
Cash or cash equivalent
|
Invisalign | General | $25.00 |
| Straumann USA LLC |
Food and Beverage
Cash or cash equivalent
|
— | General | $23.19 |
| Zest Holdings, LLC |
Food and Beverage
Cash or cash equivalent
|
— | General | $16.92 |
| Align Technology, Inc. |
Food and Beverage
Cash or cash equivalent
|
Invisalign | General | $16.59 |
| Align Technology, Inc. |
Food and Beverage
Cash or cash equivalent
|
Invisalign | General | $8.25 |
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 2023.
| Brand Name | Generic Name | Prescriptions | Day Supply | Total Cost | Patients |
|---|---|---|---|---|---|
| Amoxicillin | Amoxicillin | 13 | 81 | $58.49 | 11 |
Source: CMS Part D by Provider and Drug, 2023; rows below 11 claims omitted by CMS; volume isn’t quality. Privacy limits
Specialties & License Numbers Reported to NPPES
Self-certified to NPPES: 2021-04-22NUCC Taxonomy Code: 1223G0001X
A general dentist is the primary dental care provider for patients of all ages. The general dentist is responsible for the diagnosis, treatment, management and overall coordination of services related to patients' oral health needs.
Medicare (PECOS) Enrollment & Ordering Eligibility
Source: CMS PECOSORDER AND REFERRING ONLY - DENTIST
I20160315000778
CA
6709182983
Sources: CMS Provider Enrollment and Order and Referring. Medicare enrollment is a billing status, not an accreditation or quality rating.
Secondary Practice Locations
181 2nd Ave Ste 575
San Mateo, CA 944013838
Phone: 6505323092
Career & Practice History Timeline
Changes recorded in monthly NPPES data files: addresses, names, credentials, specialties and NPI status
Registered at 453 BROADWAY, MILLBRAE, CA 940301905 (Tel: 6506972073)
Registered at 453 BROADWAY, MILLBRAE, CA 940301905 (Tel: 6506972073)
Registered at 181 2ND AVE STE 575, SAN MATEO, CA 944013838 (Tel: 6505323092)
Registered at 181 2ND AVE STE 575, SAN MATEO, CA 944013838 (Tel: 6505323092)
NPI status registered as active in NPPES database
Registered at 1515 OAK RIM DR, HILLSBOROUGH, CA 940107366 (Tel: 6507667055)
Registered at 1515 OAK RIM DR, HILLSBOROUGH, CA 940107366 (Tel: 6507667055)
Recorded as JAMES WARREN, D.D.S.
Dentist (license number reported to NPPES: CA 64795)
First registered as active Individual Practitioner in NPPES Database.
NPI Administrative Meta
Other Dentist - General Practices in Millbrae
- Dr. Reinhard Weiser, DDS
- Dr. Luisa Cheung, DDS
- Dr. Randall Medefesser, DDS
- Dr. Sherry Tsai, DDS
- Dr. Joseph Huang, DDS
- Dr. Julia Ma, DDS
Mailing Address
453 Broadway
Millbrae, CA 940301905
Phone: 6506972073