DR. TIMOTHY PATRICK CALLAHAN DDS
NPI 1275633836
Dentist - General Practice in Walnut Creek, CA

Q: What is Timothy Callahan's NPI number?

The NPI number for Timothy Callahan is 1275633836. It was assigned to this individual provider in the NPPES registry on September 24, 2006.

Q: What is Timothy Callahan's specialty?

The primary specialty registered for this NPI is Dentist, specializing in General Practice, with taxonomy code 1223G0001X.

Q: Is Timothy Callahan enrolled in Medicare?

No. Timothy Callahan has opted out of Medicare through May 2, 2028. Care is provided under private contracts, and Medicare does not pay for services furnished by providers who have opted out. The provider remains eligible to order and refer services for Medicare patients.

Q: When was this NPI record last updated?

The NPPES record for Timothy Callahan was last updated on July 8, 2007. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 19 years 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.

Active since September 24, 2006Opted out of Medicare · through May 2, 2028

1801 OAKLAND BLVD STE 120, WALNUT CREEK, CA 94596(925) 947-0616 Get Directions Write a Review

NPPES record last updated: July 8, 2007. Verified against the NPPES registry weekly; last sync: August 09, 2026.

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About Dr. Timothy Patrick Callahan Dds NPPES

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

DR. TIMOTHY PATRICK CALLAHAN DDS (NPI 1275633836) is an individual general practice provider in Walnut Creek, California, licensed in California (30364) and active in the NPI registry since September 2006. He has opted out of Medicare through May 2, 2028 and remains eligible to order and refer.

NPPES Registry Identity

NPI1275633836

Entity TypeIndividualMale

Primary Taxonomy1223G0001X

Provider Legal NameDR. TIMOTHY PATRICK CALLAHANCredential: DDS

Location Address1801 OAKLAND BLVD STE 120Walnut Creek, CA 94596-7001

Mailing Address1801 Oakland Blvd Ste 120Walnut Creek, CA 94596-7001 · (925) 947-0616

Phone(925) 947-0616

Sole ProprietorYes

Enumeration DateSeptember 24, 2006

Last NPPES UpdateJuly 8, 2007

✔ NPI 1275633836 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyDentist · General PracticeDental Providers

Taxonomy Code1223G0001X

License✔ Licensed in CA · 30364

Definition

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.

1801 OAKLAND BLVD STE 120, Walnut Creek, CA 94596

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Medicare Participation & PECOS CMS

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

Medicare Enrollment Status

ⓘ

Opted out of Medicare

Dr. Timothy Patrick Callahan Dds has filed a Medicare opt-out affidavit. Services are provided under private contract between the provider and the patient, and are not billed to or reimbursed by Medicare. The opt-out is on file from May 2, 2016 through May 2, 2028.

Opt-Out Effective DateMay 2, 2016

Opt-Out In Effect ThroughMay 2, 2028Opt-out affidavits renew automatically every two years unless cancelled

Eligible to Order & Refer✔ Part B Labs & Imaging✔ Durable Medical Equipment✔ Home Health Agency– Power Mobility DevicesAn opted-out provider can still order and refer for Medicare patients in the categories marked above, even though their own services are not covered.

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 94596 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

$84.91 typical visit price

range $23.44 – $166.46

Typical copayment $21.22 (range $5.86 – $41.61)

Most-billed visit code 99213

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 Timothy Callahan's NPI number?

The NPI number for Timothy Callahan is 1275633836. It was assigned to this individual provider in the NPPES registry on September 24, 2006.

Where is Timothy Callahan located?

Timothy Callahan practices at 1801 Oakland Blvd Ste 120, Walnut Creek, CA 94596. The listed phone number is (925) 947-0616.

What is Timothy Callahan's specialty?

The primary specialty registered for this NPI is Dentist, specializing in General Practice, with taxonomy code 1223G0001X.

Is Timothy Callahan enrolled in Medicare?

No. Timothy Callahan has opted out of Medicare through May 2, 2028. Care is provided under private contracts, and Medicare does not pay for services furnished by providers who have opted out. The provider remains eligible to order and refer services for Medicare patients.

When was this NPI record last updated?

The NPPES record for Timothy Callahan was last updated on July 8, 2007. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 19 years 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.