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PACIFIC RHEUMATOLOGY ASSOCIATES MEDICAL GROUP
NPI 1770576431
Internal Medicine in San Francisco, CA

Active since August 29, 2005
2100 WEBSTER ST, STE 112, SAN FRANCISCO, CA 94115(415) 923-3060(415) 749-0841 Get Directions Write a Review

NPPES record last updated: February 20, 2008. Verified against the NPPES registry weekly; last sync: November 08, 2026.

About Pacific Rheumatology Associates Medical Group NPPES

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

PACIFIC RHEUMATOLOGY ASSOCIATES MEDICAL GROUP (NPI 1770576431) is a healthcare organization registered as an internal medicine in San Francisco, California and active in the NPI registry since August 2005. The organization lists Neal S Birnbaum, Md/partner, as its authorized official.

NPPES Registry Identity

NPI1770576431
Entity TypeOrganization
Primary Taxonomy207R00000X
Legal Business NamePACIFIC RHEUMATOLOGY ASSOCIATES MEDICAL GROUP
Location Address2100 WEBSTER ST, STE 112San Francisco, CA 94115-2373
Mailing Address2100 Webster St, Ste 112San Francisco, CA 94115-2373 · (415) 923-3060
Phone(415) 923-3060
Fax(415) 749-0841
Organization SubpartNo
Authorized OfficialNeal S BirnbaumMd/partner · (415) 923-3060
Enumeration DateAugust 29, 2005
Last NPPES UpdateFebruary 20, 2008
✔ NPI 1770576431 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyInternal MedicineAllopathic & Osteopathic Physicians
Taxonomy Code207R00000X
Licenses✔ Licensed in CA · C36561✔ Licensed in CA · A84199✔ Licensed in CA · G30575
Definition
A physician who provides long-term, comprehensive care in the office and the hospital, managing both common and complex illness of adolescents, adults and the elderly. Internists are trained in the diagnosis and treatment of cancer, infections and diseases affecting the heart, blood, kidneys, joints and digestive, respiratory and vascular systems. They are also trained in the essentials of primary care internal medicine, which incorporates an understanding of disease prevention, wellness, substance abuse, mental health and effective treatment of common problems of the eyes, ears, skin, nervous system and reproductive organs.
2100 WEBSTER ST, San Francisco, CA 94115
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Other Identifiers 2

Medicare PINZZZ38144ZCA
Medicare NSC0407180001CA

Group Practice 1

Group TaxonomyThis provider is a business group of one or more individual practitioners, who practice with different areas of specialization.193200000X MULTI-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)

Pacific Rheumatology Associates Medical Group is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).

Clinicians Billing Medicare Through This Organization

4

Medicare enrollment records show 4 clinicians reassign Medicare billing to Pacific Rheumatology Associates Medical Group, which bills Medicare for the services they deliver. Of these, 3 practice at this address. They are listed nearest first.

Clinicians, nearest first (4)

Pedro Ruiz, M.D., PH.D.
Internal Medicine
NPI 1023204468
2100 WEBSTER ST SUITE 112
San Francisco, CA 94115
(415) 923-3060
✔ PECOS✔ Accepts MedicareSame address
Ishita Aggarwal, MD
Rheumatology
NPI 1518385699
2100 WEBSTER ST STE 112
San Francisco, CA 94115
(415) 923-3060
✔ PECOS✔ Accepts MedicareSame address
Molly Magnano, MD
Rheumatology
NPI 1992743579
2100 WEBSTER ST STE 112
San Francisco, CA 94115
(415) 923-3060
✔ PECOS✔ Accepts MedicareSame address
Neal Birnbaum, M.D.
Rheumatology
NPI 1437142882
4000 CIVIC CENTER DR STE 200A
San Rafael, CA 94903
(415) 464-9604
✔ PECOS16 mi

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 Pacific Rheumatology Associates Medical Group's NPI number?

The NPI number for Pacific Rheumatology Associates Medical Group is 1770576431. It was assigned to this organization in the NPPES registry on August 29, 2005.

Where is Pacific Rheumatology Associates Medical Group located?

Pacific Rheumatology Associates Medical Group is located at 2100 Webster St Ste 112, San Francisco, CA 94115. The listed phone number is (415) 923-3060.

What is Pacific Rheumatology Associates Medical Group's specialty?

The primary specialty registered for this NPI is Internal Medicine with taxonomy code 207R00000X.

Is Pacific Rheumatology Associates Medical Group enrolled in Medicare?

Yes. Pacific Rheumatology Associates Medical Group is registered in the Medicare PECOS enrollment system.

How many clinicians bill Medicare through Pacific Rheumatology Associates Medical Group?

According to the CMS Revalidation Reassignment List (October 2026 release), 4 clinicians in 2 Medicare specialties reassign their Medicare billing to Pacific Rheumatology Associates Medical Group. 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. The largest specialties are Rheumatology (3) and Internal Medicine (1). Of these, 3 practice at this address. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.

When was this NPI record last updated?

The NPPES record for Pacific Rheumatology Associates Medical Group was last updated on February 20, 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.