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NATHAN BILLETT MD
NPI 1447952593
Internal Medicine in South San Francisco, CA

Active since March 21, 2023PECOS Enrolled
1200 EL CAMINO REAL, SOUTH SAN FRANCISCO, CA 94080(650) 742-2000 Get Directions Write a Review

NPPES record last updated: July 21, 2026. Verified against the NPPES registry weekly; last sync: October 18, 2026.

Record update history: Jul 21, 2026, Mar 21, 2023 (2 updates tracked since 2023).

About Nathan Billett Md NPPES

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

NATHAN BILLETT MD (NPI 1447952593) is an individual internal medicine provider in South San Francisco, California, licensed in California (199091) and active in the NPI registry since March 2023. He is enrolled in Medicare PECOS and maintains a secondary practice location in San Rafael.

NPPES Registry Identity

NPI1447952593
Entity TypeIndividualMale
Primary Taxonomy207R00000X
Provider Legal NameNATHAN BILLETTCredential: MD
Location Address1200 EL CAMINO REALSouth San Francisco, CA 94080-3299
Mailing Address5820 Owens Dr Fl 2Pleasanton, CA 94588-3900
Phone(650) 742-2000
Sole ProprietorYes
Enumeration DateMarch 21, 2023
Last NPPES UpdateJuly 21, 20262 updates tracked since enumeration
NPPES CertifiedJuly 21, 2026
✔ NPI 1447952593 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyInternal MedicineAllopathic & Osteopathic Physicians
Taxonomy Code207R00000X
License✔ Licensed in CA · 199091
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.
1200 EL CAMINO REAL, South San Francisco, CA 94080
Open in Google Maps ↗

Secondary Practice Location 1

Location 199 Montecillo RdSan Rafael, CA 94903-3308 · Phone (415) 444-2000

Medicare Participation & PECOS CMS

Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.

Medicare Enrollment Status

✔

Enrolled in Medicare (PECOS)

Nathan Billett Md 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.

Medicare Billing Reassignment

Medicare enrollment records show Nathan Billett reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.

Permanente Medical Group Inc
8.6 mi
Internal Medicine
2238 GEARY
San Francisco, CA 94116
  • Reassigned Medicare billing, California enrollment
  • 20,078 clinicians in this Medicare group
NPI 1841373800 (415) 833-2200

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

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 20

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

SANDRA MOONHEE LEE PHARM. D.
Pharmacist
1200 EL CAMINO REAL
SOUTH SAN FRANCISCO, CA 94080
San Mateo County (650) 742-2627
MELISSA ARGENTE RT
Respiratory Therapist, Registered
1200 EL CAMINO REAL
SOUTH SAN FRANCISCO, CA 94080
San Mateo County (650) 742-3313
DR. JAMES NICHOLAS PEROS MD
Internal Medicine
1200 EL CAMINO REAL
SOUTH SAN FRANCISCO, CA 94080
San Mateo County (650) 742-2000
DR. PIERSON CHIOU M.D.
Radiology (Diagnostic Radiology)
1200 EL CAMINO REAL, 1ST FLOOR, DEPARTMENT OF RADIOLOGY
SOUTH SAN FRANCISCO, CA 94080
San Mateo County (650) 742-3882
MS. LARELL LOUISE FINEREN CRNA
Nurse Anesthetist, Certified Registered
1200 EL CAMINO REAL
SOUTH SAN FRANCISCO, CA 94080
San Mateo County (650) 742-3037
EDMOND L. SCHMULBACH MD
Internal Medicine (Hematology & Oncology)
1200 EL CAMINO REAL
SOUTH SAN FRANCISCO, CA 94080
San Mateo County (650) 742-2000
EDWARD J. BADDOUR MD
Emergency Medicine
1200 EL CAMINO REAL
SOUTH SAN FRANCISCO, CA 94080
San Mateo County (650) 742-2000
ESTHER KOESHADI PHARM.D.
Pharmacist
1200 EL CAMINO REAL, KAISER PERMANENTE INPATIENT PHARMACY 3RD FLOOR
SOUTH SAN FRANCISCO, CA 94080
San Mateo County (650) 742-2486

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 Nathan Billett's NPI number?

The NPI number for Nathan Billett is 1447952593. It was assigned to this individual provider in the NPPES registry on March 21, 2023.

Where is Nathan Billett located?

Nathan Billett practices at 1200 El Camino Real, South San Francisco, CA 94080. The listed phone number is (650) 742-2000.

What is Nathan Billett's specialty?

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

Is Nathan Billett enrolled in Medicare?

Yes. Nathan Billett is registered in the Medicare PECOS enrollment system.

Which organization bills Medicare for Nathan Billett's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Nathan Billett reassigns Medicare benefits to Permanente Medical Group Inc (San Francisco, CA). The 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 Nathan Billett's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.

When was this NPI record last updated?

The NPPES record for Nathan Billett was last updated on July 21, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 3 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.