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MARK R NORTHFIELD, M.D.
NPI 1609051572
Specialist in Petaluma, CA

Active since January 09, 2008
1496 PROFESSIONAL DR, SUITE 601, PETALUMA, CA 94954(707) 778-1131(707) 778-3818 Get Directions Write a Review

NPPES record last updated: January 9, 2008. Verified against the NPPES registry weekly; last sync: August 09, 2026.

About Mark R Northfield, M.d. NPPES

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

MARK R NORTHFIELD, M.D. (NPI 1609051572) is a healthcare organization registered as a specialist in Petaluma, California and active in the NPI registry since January 2008. The organization lists Lee D Brill, Receptionist, as its authorized official.

NPPES Registry Identity

NPI1609051572
Entity TypeOrganization
Primary Taxonomy174400000X
Legal Business NameMARK R NORTHFIELD, M.D.
Location Address1496 PROFESSIONAL DR, SUITE 601Petaluma, CA 94954-6698
Mailing Address1496 Professional Dr, Suite 601Petaluma, CA 94954-6698 · (707) 778-1131 · Fax (707) 778-3818
Phone(707) 778-1131
Fax(707) 778-3818
Organization SubpartNo
Authorized OfficialLee D BrillReceptionist · (707) 778-1131
Enumeration DateJanuary 9, 2008
✔ NPI 1609051572 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtySpecialistOther Service Providers
Taxonomy Code174400000X
License✔ Licensed in CA · G77114
Definition
An individual educated and trained in an applied knowledge discipline used in the performance of work at a level requiring knowledge and skills beyond or apart from that provided by a general education or liberal arts degree.
1496 PROFESSIONAL DR, Petaluma, CA 94954
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Other Identifiers 3

Medicare NSC1302010001CA
Medicare UPINF70479CA
Medicare PIN00G77114CA

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 MULTIPLE SINGLE SPECIALTY GROUP

Other Providers at the Same Location NPPES 3

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

DAVID MARK RUDNICK MD
Urology
1496 PROFESSIONAL DR, SUITE 603
PETALUMA, CA 94954
Sonoma County (707) 762-0059
MR. DANA CHARLES NIENDORF MD
Urology
1496 PROFESSIONAL DR, STE 603
PETALUMA, CA 94954
Sonoma County (707) 762-0059
JAMES J. GLYNN, M.D. A MEDICAL CORPORATION
Specialist
1496 PROFESSIONAL DR, SUITE 601
PETALUMA, CA 94954
Sonoma County (707) 778-1131

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 Mark R Northfield, M.D.'s NPI number?

The NPI number for Mark R Northfield, M.D. is 1609051572. It was assigned to this organization in the NPPES registry on January 9, 2008.

Where is Mark R Northfield, M.D. located?

Mark R Northfield, M.D. is located at 1496 Professional Dr Suite 601, Petaluma, CA 94954. The listed phone number is (707) 778-1131.

What is Mark R Northfield, M.D.'s specialty?

The primary specialty registered for this NPI is Specialist with taxonomy code 174400000X.

When was this NPI record last updated?

The NPPES record for Mark R Northfield, M.D. was last updated on January 9, 2008. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 18 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.