1. Home
  2. Directory
  3. California
  4. Oakland
  5. Family Medicine
  6. NPI Profile
Recently Updated NPI Information — some details in this NPI profile have been updated in the NPI registry within the last 60 days.

DR. DIANA CHEN MD, MBA
NPI 1073136057
Family Medicine - Addiction Medicine in Oakland, CA

Active since May 25, 2020PECOS Enrolled
2950 INTERNATIONAL BLVD, OAKLAND, CA 94601(510) 535-4400 Get Directions Write a Review

NPPES record last updated: July 30, 2026. Verified against the NPPES registry weekly; last sync: August 09, 2026.

Record update history: Jul 30, 2026, May 9, 2024, Nov 13, 2023 and 1 more (4 updates tracked since 2020).

About Dr. Diana Chen Md, Mba NPPES

Official registry information on file with the National Plan and Provider Enumeration System.

DR. DIANA CHEN MD, MBA (NPI 1073136057) is an individual addiction medicine provider in Oakland, California, licensed in California (A188341) and active in the NPI registry since May 2020. She is enrolled in Medicare PECOS and maintains 2 additional practice locations.

NPPES Registry Identity

NPI1073136057
Entity TypeIndividualFemale
Primary Taxonomy207QA0401X
Provider Legal NameDR. DIANA CHENCredential: MD, MBA
Location Address2950 INTERNATIONAL BLVDOakland, CA 94601-2228
Mailing Address2950 International BlvdOakland, CA 94601-2228 · (510) 535-4400
Phone(510) 535-4400
Sole ProprietorNo
Enumeration DateMay 25, 2020
Last NPPES UpdateJuly 30, 20264 updates tracked since enumeration
NPPES CertifiedJuly 30, 2026
✔ NPI 1073136057 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses 2

★ Primary SpecialtyFamily Medicine · Addiction MedicineAllopathic & Osteopathic Physicians
Taxonomy Code207QA0401X
License✔ Licensed in CA · A188341
Definition
A family medicine physician who specializes in the diagnosis and treatment of addictions.
Also ListedFamily MedicineTaxonomy 207Q00000X · License A188341 (CA)
2950 INTERNATIONAL BLVD, Oakland, CA 94601
Open in Google Maps ↗

Secondary Practice Locations 2

Location 1401 Quarry Rd Rm 2208Palo Alto, CA 94304-1419 · Phone (650) 723-2423
Location 2795 El Camino RealPalo Alto, CA 94301-2302 · Phone (650) 321-4121

Medicare Participation & PECOS CMS

Medicare enrollment, assignment, and ordering and referring status from the CMS PECOS system.

Medicare Enrollment Status

✔

Enrolled in Medicare (PECOS)

Dr. Diana Chen Md, Mba is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).

Eligible to Order & Refer✔ Part B Labs & Imaging✔ Durable Medical Equipment✔ Home Health Agency✔ Power Mobility DevicesPer the CMS Ordering and Referring file. Eligibility means Medicare pays claims that this provider orders or refers for these categories.

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 94601 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.

New Patient
$153.83 typical visit price
range $69.00 – $202.35
Typical copayment $38.45 (range $17.25 – $50.58)
Most-billed visit code 99204
Established Patient
$119.48 typical visit price
range $23.44 – $166.46
Typical copayment $29.87 (range $5.86 – $41.61)
Most-billed visit code 99214
Amounts reflect what Medicare beneficiaries in this ZIP area are typically charged for office visits. Patients with other coverage should check their individual plans.

Other Providers at the Same Location NPPES 20

Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.

KATHY TUTINO
Dental Hygienist
2950 INTERNATIONAL BLVD
OAKLAND, CA 94601
Alameda County (510) 535-4450
COLLEEN MCCULLOUGH FNP
Nurse Practitioner (Family)
2950 INTERNATIONAL BLVD
OAKLAND, CA 94601
Alameda County (510) 535-4400
HEIDY SOFIA RAMOS FERNANDEZ RN
Registered Nurse
2950 INTERNATIONAL BLVD
OAKLAND, CA 94601
Alameda County (510) 434-5300
SARAH GILSTRAP
Registered Nurse
2950 INTERNATIONAL BLVD
OAKLAND, CA 94601
Alameda County (510) 535-4410
CASEY JAKE SMITH
Internal Medicine
2950 INTERNATIONAL BLVD
OAKLAND, CA 94601
Alameda County (505) 862-2029
SIMONE MARIE GARRIGUES M.A., L.C.S.W.
Social Worker (Clinical)
2950 INTERNATIONAL BLVD, NATIVE AMERICAN HEALTH CENTER
OAKLAND, CA 94601
Alameda County (510) 535-4400
CRYSTAL HUANG MD
Family Medicine
2950 INTERNATIONAL BLVD
OAKLAND, CA 94601
Alameda County (510) 535-4400
KYOUNG WON HAN DDS
Dentist
2950 INTERNATIONAL BLVD
OAKLAND, CA 94601
Alameda County (510) 485-5925

Frequently Asked Questions NPPES & CMS

Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.

What is Diana Chen's NPI number?

The NPI number for Diana Chen is 1073136057. It was assigned to this individual provider in the NPPES registry on May 25, 2020.

Where is Diana Chen located?

Diana Chen practices at 2950 International Blvd, Oakland, CA 94601. The listed phone number is (510) 535-4400.

What is Diana Chen's specialty?

The primary specialty registered for this NPI is Family Medicine, specializing in Addiction Medicine, with taxonomy code 207QA0401X.

Is Diana Chen enrolled in Medicare?

Yes. Diana Chen is registered in the Medicare PECOS enrollment system.

When was this NPI record last updated?

The NPPES record for Diana Chen was last updated on July 30, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 16 days ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.