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DR. PATRICK SHAWN TWOMEY M.D.
NPI 1265639454
Internal Medicine in South San Francisco, CA

Active since June 29, 2007PECOS Enrolled
1 DNA WAY, SOUTH SAN FRANCISCO, CA 94080(650) 225-2580(650) 225-6000 Get Directions Write a Review

NPPES record last updated: February 15, 2018. Verified against the NPPES registry weekly; last sync: August 09, 2026.

About Dr. Patrick Shawn Twomey M.d. NPPES

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

DR. PATRICK SHAWN TWOMEY M.D. (NPI 1265639454) is an individual internal medicine provider in South San Francisco, California, licensed in Virginia (0101245204) and active in the NPI registry since June 2007. He is enrolled in Medicare PECOS.

NPPES Registry Identity

NPI1265639454
Entity TypeIndividualMale
Primary Taxonomy207R00000X
Provider Legal NameDR. PATRICK SHAWN TWOMEYCredential: M.D.
Location Address1 DNA WAYSouth San Francisco, CA 94080-4918
Mailing Address1 Dna WaySouth San Francisco, CA 94080-4918 · (650) 225-2580 · Fax (650) 225-6000
Phone(650) 225-2580
Fax(650) 225-6000
Sole ProprietorNo
Enumeration DateJune 29, 2007
Last NPPES UpdateFebruary 15, 2018
✔ NPI 1265639454 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyInternal MedicineAllopathic & Osteopathic Physicians
Taxonomy Code207R00000X
License✔ Licensed in VA · 0101245204
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.
1 DNA WAY, South San Francisco, CA 94080
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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 (PECOS)

Dr. Patrick Shawn Twomey M.d. is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).

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 94080 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
$153.83 typical visit price
range $69.00 – $202.35
Typical copayment $38.45 (range $17.25 – $50.58)
Most-billed visit code 99204
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.

Other Providers at the Same Location NPPES 12

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

DR. KETNA MISTRY MD
Pediatrics
1 DNA WAY, MS 8214
SOUTH SAN FRANCISCO, CA 94080
San Mateo County (650) 303-6097
DR. IAN L MCLEAN MBCHB PHD FACP FRCP
Internal Medicine (Rheumatology)
1 DNA WAY, GENENTECH
SOUTH SAN FRANCISCO, CA 94080
San Mateo County (650) 467-3356
SALENA QUAN NP
Nurse Practitioner (Occupational Health)
1 DNA WAY
SOUTH SAN FRANCISCO, CA 94080
San Mateo County (650) 225-3039
DR. HAROLD VINCENT BARRON MD
Specialist
1 DNA WAY
SOUTH SAN FRANCISCO, CA 94080
San Mateo County (650) 225-6993
DR. MARK CHRISTOPHER BENYUNES M.D.
Internal Medicine (Medical Oncology)
1 DNA WAY, MAILSTOP 444B
SOUTH SAN FRANCISCO, CA 94080
San Mateo County (650) 225-1628
ARUN VILLIVALAM, MD., INC.
General Practice
1 DNA WAY, BUILDING 5
SOUTH SAN FRANCISCO, CA 94080
San Mateo County (703) 760-0700
JAKOB DUPONT MD
Internal Medicine (Medical Oncology)
1 DNA WAY
SOUTH SAN FRANCISCO, CA 94080
San Mateo County (650) 255-9183
DR. MELISSA GARIG BRAMMER M.D., M.P.H.
Internal Medicine (Medical Oncology)
1 DNA WAY
SOUTH SAN FRANCISCO, CA 94080
San Mateo County (650) 467-7700

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 Patrick Twomey's NPI number?

The NPI number for Patrick Twomey is 1265639454. It was assigned to this individual provider in the NPPES registry on June 29, 2007.

Where is Patrick Twomey located?

Patrick Twomey practices at 1 Dna Way, South San Francisco, CA 94080. The listed phone number is (650) 225-2580.

What is Patrick Twomey's specialty?

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

Is Patrick Twomey enrolled in Medicare?

Yes. Patrick Twomey is registered in the Medicare PECOS enrollment system.

When was this NPI record last updated?

The NPPES record for Patrick Twomey was last updated on February 15, 2018. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 8 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.