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Recently Updated NPI Information — some details in this NPI profile have been updated in the NPI registry within the last 60 days.

DR. DAVID ALAN DUNCAN D.O.
NPI 1710967922
Family Medicine in San Ramon, CA

Active since January 23, 2006PECOS EnrolledAccepts Medicare Assignment
3268 CASA GRANDE DR, SAN RAMON, CA 94583(415) 237-1843 Get Directions Write a Review

NPPES record last updated: August 11, 2026. Verified against the NPPES registry weekly; last sync: August 16, 2026.

Record update history: Aug 11, 2026, Sep 6, 2020, Nov 5, 2019 (3 updates tracked since 2019).

About Dr. David Alan Duncan D.o. NPPES

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

DR. DAVID ALAN DUNCAN D.O. (NPI 1710967922) is an individual family medicine provider in San Ramon, California, licensed in Indiana (02002571A) and active in the NPI registry since January 2006. He is enrolled in Medicare PECOS and is a graduate of Other (2011).

NPPES Registry Identity

NPI1710967922
Entity TypeIndividualMale
Primary Taxonomy207Q00000X
Provider Legal NameDR. DAVID ALAN DUNCANCredential: D.O.
Location Address3268 CASA GRANDE DRSan Ramon, CA 94583-3004
Mailing Address3268 Casa Grande DrSan Ramon, CA 94583-3004 · (415) 237-1843
Phone(415) 237-1843
Sole ProprietorNo
Medical School CMSOtherGraduated 2011
Enumeration DateJanuary 23, 2006
Last NPPES UpdateAugust 11, 20263 updates tracked since enumeration
NPPES CertifiedAugust 11, 2026
✔ NPI 1710967922 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses 2

★ Primary SpecialtyFamily MedicineAllopathic & Osteopathic Physicians
Taxonomy Code207Q00000X
Licenses✔ Licensed in IN · 02002571A✔ Licensed in CA · 20A15980
Definition
Family Medicine is the medical specialty which is concerned with the total health care of the individual and the family. It is the specialty in breadth which integrates the biological, clinical, and behavioral sciences. The scope of family medicine is not limited by age, sex, organ system, or disease entity.
Also ListedFamily Medicine · Addiction MedicineTaxonomy 207QA0401X · License 20A15980 (CA)
3268 CASA GRANDE DR, San Ramon, CA 94583
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Medicare Participation & PECOS CMS

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

Medicare Enrollment Status

✔

Enrolled in Medicare and accepts Medicare assignment

Dr. David Alan Duncan D.o. is registered in PECOS and agrees to accept the Medicare-approved amount as full payment. Medicare patients are not billed beyond the standard deductible and coinsurance.

PECOS PAC ID6901300110
PECOS Enrollment IDI20250919002791
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 94583 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
$104.51 typical visit price
range $69.00 – $202.35
Typical copayment $26.12 (range $17.25 – $50.58)
Most-billed visit code 99203
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.

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 David Duncan's NPI number?

The NPI number for David Duncan is 1710967922. It was assigned to this individual provider in the NPPES registry on January 23, 2006.

Where is David Duncan located?

David Duncan practices at 3268 Casa Grande Dr, San Ramon, CA 94583. The listed phone number is (415) 237-1843.

What is David Duncan's specialty?

The primary specialty registered for this NPI is Family Medicine with taxonomy code 207Q00000X.

Is David Duncan enrolled in Medicare?

Yes. David Duncan is registered in the Medicare PECOS system and accepts Medicare assignment, which means accepting the Medicare-approved amount as payment in full for covered services.

When was this NPI record last updated?

The NPPES record for David Duncan was last updated on August 11, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 13 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.