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DR. TONYA AHLBORN CHAFFEE MD
NPI 1437261591
Pediatrics in San Francisco, CA

Active since August 31, 2006PECOS Enrolled
1001 POTRERO AVE, MAIL STOP 6E, SAN FRANCISCO, CA 94110(415) 206-8361(415) 206-3686 Get Directions Write a Review

NPPES record last updated: December 27, 2011. Verified against the NPPES registry weekly; last sync: October 18, 2026.

About Dr. Tonya Ahlborn Chaffee Md NPPES

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

DR. TONYA AHLBORN CHAFFEE MD (NPI 1437261591) is an individual pediatrics provider in San Francisco, California, licensed in California (G77911) and active in the NPI registry since August 2006. She is enrolled in Medicare PECOS.

NPPES Registry Identity

NPI1437261591
Entity TypeIndividualFemale
Primary Taxonomy208000000X
Provider Legal NameDR. TONYA AHLBORN CHAFFEECredential: MD
Location Address1001 POTRERO AVE, MAIL STOP 6ESan Francisco, CA 94110-3518
Mailing Address1001 Potrero Ave, Mail Stop 6eSan Francisco, CA 94110-3518 · (415) 206-8361 · Fax (415) 206-3686
Phone(415) 206-8361
Fax(415) 206-3686
Sole ProprietorNo
Enumeration DateAugust 31, 2006
Last NPPES UpdateDecember 27, 2011
✔ NPI 1437261591 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses 2

★ Primary SpecialtyPediatricsAllopathic & Osteopathic Physicians
Taxonomy Code208000000X
License✔ Licensed in CA · G77911
Definition
A pediatrician is concerned with the physical, emotional and social health of children from birth to young adulthood. Care encompasses a broad spectrum of health services ranging from preventive healthcare to the diagnosis and treatment of acute and chronic diseases. A pediatrician deals with biological, social and environmental influences on the developing child, and with the impact of disease and dysfunction on development.
Also ListedPediatrics · Adolescent MedicineTaxonomy 2080A0000X · License G77911 (CA)
1001 POTRERO AVE, San Francisco, CA 94110
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Other Identifiers 3

Medicare ID-Type Unspecified00G779112CA
Medicare UPING01951
Medicaid00G779112CA

Medicare Participation & PECOS CMS

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

Medicare Enrollment Status

✔

Enrolled in Medicare (PECOS)

Dr. Tonya Ahlborn Chaffee 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 Reassignments

2

Medicare enrollment records show Tonya Chaffee reassigns Medicare billing to 2 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.

City & County Of San Francisco
0.1 mi
General Acute Care Hospital
1001 POTRERO AVE, BUILDING 5, WARD 1B
San Francisco, CA 94110
  • Reassigned Medicare billing, California enrollment
  • 1,573 clinicians in this Medicare group
NPI 1083648810 (415) 759-4067
University Of California Sfgh Medical Group
0.1 mi
Family Medicine
1001 POTRERO AVE, BLDG 80 WARD 83 RM 320
San Francisco, CA 94110
  • Reassigned Medicare billing, California enrollment
  • Also billed through NPI 1073836060 (California)
  • 842 clinicians in this Medicare group
NPI 1174598296 (628) 206-8610

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 94110 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
$104.51 typical visit price
range $69.00 – $202.35
Typical copayment $26.12 (range $17.25 – $50.58)
Most-billed visit code 99203
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.

ROCIO C AGRAZ-LARA RN, PHN
Registered Nurse
1001 POTRERO AVE, ZSFG BUILDING 90 4TH FLOOR
SAN FRANCISCO, CA 94110
San Francisco County (415) 206-8524
DR. SUSAN WLODARCZYK MD
Student in an Organized Health Care Education/Training Program
1001 POTRERO AVE, BLDG 10, 3RD FLOOR, WARD 13 BOX 1364
SAN FRANCISCO, CA 94110
San Francisco County (415) 206-5164
AMY DINER PSY.D.
Student in an Organized Health Care Education/Training Program
1001 POTRERO AVE
SAN FRANCISCO, CA 94110
San Francisco County (415) 206-5270
CHRISTOPHER RUIZ
Case Manager/Care Coordinator
1001 POTRERO AVE
SAN FRANCISCO, CA 94110
San Francisco County (415) 206-3950
C. STIRLING SOMERS
Counselor
1001 POTRERO AVE
SAN FRANCISCO, CA 94110
San Francisco County (415) 206-5270
WILLIAM RUSSEL CARPENTER FNP-C
Nurse Practitioner (Family)
1001 POTRERO AVE
SAN FRANCISCO, CA 94110
San Francisco County (628) 206-8000
REGENTS OF THE UNIVERSITY OF CALIFORNIA
Clinical Medical Laboratory
1001 POTRERO AVE, BLDG 100, RM 104
SAN FRANCISCO, CA 94110
San Francisco County (415) 502-4775
DR. DENISE RENEE GONZALEZ MD
Internal Medicine
1001 POTRERO AVE, 1M
SAN FRANCISCO, CA 94110
San Francisco County (415) 206-6075

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 Tonya Chaffee's NPI number?

The NPI number for Tonya Chaffee is 1437261591. It was assigned to this individual provider in the NPPES registry on August 31, 2006.

Where is Tonya Chaffee located?

Tonya Chaffee practices at 1001 Potrero Ave Mail Stop 6E, San Francisco, CA 94110. The listed phone number is (415) 206-8361.

What is Tonya Chaffee's specialty?

The primary specialty registered for this NPI is Pediatrics with taxonomy code 208000000X.

Is Tonya Chaffee enrolled in Medicare?

Yes. Tonya Chaffee is registered in the Medicare PECOS enrollment system.

Which organizations bill Medicare for Tonya Chaffee's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Tonya Chaffee reassigns Medicare benefits to 2 organizations: City & County Of San Francisco (San Francisco, CA) and University Of California Sfgh Medical Group (San Francisco, CA). Each 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 Tonya Chaffee'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 Tonya Chaffee was last updated on December 27, 2011. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 14 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.