CHRISTOPHER KASSAR D.O. INC.
NPI 1831346592
Family Medicine in San Dimas, CA

Q: What is Christopher Kassar D.O. Inc.'s NPI number?

The NPI number for Christopher Kassar D.O. Inc. is 1831346592. It was assigned to this organization in the NPPES registry on August 25, 2008. The provider was formerly known as Tim Ferguson MD Inc.

Q: What is Christopher Kassar D.O. Inc.'s specialty?

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

Active since August 25, 2008

615 E FOOTHILL BLVD STE A, SAN DIMAS, CA 91773(626) 335-3527(626) 623-7233 Get Directions Write a Review

NPPES record last updated: October 14, 2025. Verified against the NPPES registry weekly; last sync: October 18, 2026.

Record update history: Apr 10, 2025, Apr 4, 2025 (2 updates tracked since 2025).

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About Christopher Kassar D.o. Inc. NPPES

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

CHRISTOPHER KASSAR D.O. INC. (NPI 1831346592), doing business as Tim Ferguson Md Inc, is a healthcare organization registered as a family medicine in San Dimas, California and active in the NPI registry since August 2008. The organization lists Tammi Lyn Parr, Office Manager, as its authorized official.

NPPES Registry Identity

NPI1831346592

Entity TypeOrganization

Primary Taxonomy207Q00000X

Legal Business NameCHRISTOPHER KASSAR D.O. INC.

Location Address615 E FOOTHILL BLVD STE ASan Dimas, CA 91773-1255

Mailing Address615 E Foothill Blvd Ste ASan Dimas, CA 91773-1255 · (626) 335-3527 · Fax (626) 623-7233

Phone(626) 335-3527

Fax(626) 623-7233

Organization SubpartNo

Authorized OfficialTammi Lyn ParrOffice Manager · (909) 335-3527

Enumeration DateAugust 25, 2008

Last NPPES UpdateOctober 14, 20252 updates tracked since enumeration

NPPES CertifiedOctober 14, 2025

✔ NPI 1831346592 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyFamily MedicineAllopathic & Osteopathic Physicians

Taxonomy Code207Q00000X

License✔ Licensed in CA · A036813

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.

615 E FOOTHILL BLVD STE A, San Dimas, CA 91773

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Other Names 1

Former Legal Business NameTim Ferguson Md Inc

Group Practice 1

Group TaxonomyThis provdier is a business group of one or more individual practitioners, all of who practice with the same area of specialization.193400000X SINGLE SPECIALTY GROUP

Medicare Participation & PECOS CMS

Medicare enrollment and the clinicians who bill Medicare through this organization, from CMS.

Medicare Enrollment Status

✔

Enrolled in Medicare (PECOS)

Christopher Kassar D.o. Inc. is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).

Clinicians Billing Medicare Through This Organization

Medicare enrollment records show 1 clinician reassigns Medicare billing to Christopher Kassar D.O. Inc., which bills Medicare for the services this clinician delivers.

Clinician (1)

Christopher Kassar, DO

Family Practice

NPI 1346659174

615 E FOOTHILL BLVD STE A
San Dimas, CA 91773

(909) 335-3527

✔ PECOS✔ Accepts MedicareSame address

Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.

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 Christopher Kassar D.O. Inc.'s NPI number?

The NPI number for Christopher Kassar D.O. Inc. is 1831346592. It was assigned to this organization in the NPPES registry on August 25, 2008. The provider was formerly known as Tim Ferguson MD Inc.

Where is Christopher Kassar D.O. Inc. located?

Christopher Kassar D.O. Inc. is located at 615 E Foothill Blvd Ste A, San Dimas, CA 91773. The listed phone number is (626) 335-3527.

What is Christopher Kassar D.O. Inc.'s specialty?

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

Is Christopher Kassar D.O. Inc. enrolled in Medicare?

Yes. Christopher Kassar D.O. Inc. is registered in the Medicare PECOS enrollment system.

How many clinicians bill Medicare through Christopher Kassar D.O. Inc.?

According to the CMS Revalidation Reassignment List (October 2026 release), 1 clinician (Family Practice) reassigns their Medicare billing to Christopher Kassar D.O. Inc.. A reassignment is filed with Medicare on form CMS-855R, signed by both the clinician and the organization, and lets the organization bill Medicare and receive payment for the clinician's services. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.

When was this NPI record last updated?

The NPPES record for Christopher Kassar D.O. Inc. was last updated on October 14, 2025. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 12 months 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.