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KIRSTEN YVETTE DAY MD
NPI 1730270323
Family Medicine in San Francisco, CA

Active since September 27, 2006PECOS Enrolled
1001 POTRERO AVENUE, BLDG 80 WARD 83, SAN FRANCISCO, CA 94110(415) 206-8651(415) 206-8387 Get Directions Write a Review

NPPES record last updated: July 8, 2007. Verified against the NPPES registry weekly; last sync: October 18, 2026.

About Kirsten Yvette Day Md NPPES

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

KIRSTEN YVETTE DAY MD (NPI 1730270323) is an individual family medicine provider in San Francisco, California, licensed in California (G72692) and active in the NPI registry since September 2006. She is enrolled in Medicare PECOS.

NPPES Registry Identity

NPI1730270323
Entity TypeIndividualFemale
Primary Taxonomy207Q00000X
Provider Legal NameKIRSTEN YVETTE DAYCredential: MD
Location Address1001 POTRERO AVENUE, BLDG 80 WARD 83San Francisco, CA 94110-3518
Mailing AddressPo Box 7464San Francisco, CA 94120-7464 · (415) 206-3103 · Fax (415) 206-3872
Phone(415) 206-8651
Fax(415) 206-8387
Sole ProprietorNo
Enumeration DateSeptember 27, 2006
Last NPPES UpdateJuly 8, 2007
✔ NPI 1730270323 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyFamily MedicineAllopathic & Osteopathic Physicians
Taxonomy Code207Q00000X
License✔ Licensed in CA · G72692
Definition
Family Medicine is the medical specialty which is concerned with the total health care of the individual and the family. It is the specialty in breadth which integrates the biological, clinical, and behavioral sciences. The scope of family medicine is not limited by age, sex, organ system, or disease entity.
1001 POTRERO AVENUE, San Francisco, CA 94110
Open in Google Maps ↗

Other Identifiers 3

Medicare UPINF86506
Medicare ID-Type Unspecified00G726920CA
Medicaid00G728920CA

Medicare Participation & PECOS CMS

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

Medicare Enrollment Status

✔

Enrolled in Medicare (PECOS)

Kirsten Yvette Day 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 Kirsten Day 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
Same address
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
Same address
Family Medicine
1001 POTRERO AVE, BLDG 80 WARD 83 RM 320
San Francisco, CA 94110
  • Reassigned Medicare billing, California enrollment
  • 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.

PWINT PHYU KHINE D.O.
Radiology (Diagnostic Radiology)
1001 POTRERO AVENUE, BLDG. 5, 1ST FLOOR
SAN FRANCISCO, CA 94110
San Francisco County (628) 206-8020
JOYCE SESE DORADO PH D
Psychologist (Clinical)
1001 POTRERO AVENUE, RM 7M
SAN FRANCISCO, CA 94110
San Francisco County (415) 206-5612
CITY AND COUNY OF SAN FRANCISCO
Nuclear Medicine
1001 POTRERO AVENUE, RM G100
SAN FRANCISCO, CA 94110
San Francisco County (415) 206-8580
URMIMALA SARKAR MD
Internal Medicine
1001 POTRERO AVENUE, RM 5H22
SAN FRANCISCO, CA 94110
San Francisco County (415) 206-8317
RENA MEI MD
Internal Medicine (Gastroenterology)
1001 POTRERO AVENUE, BUILDING 5, 3RD FLOOR, SUITE 3D
SAN FRANCISCO, CA 94110
San Francisco County (628) 206-8823
MICHAEL HARRINGTON HUMPHREYS MD
Internal Medicine
1001 POTRERO AVENUE, BLDG 100 RM 350
SAN FRANCISCO, CA 94110
San Francisco County (415) 476-4617
LLOYD JOSEPH KING MD
Psychiatry & Neurology (Psychiatry)
1001 POTRERO AVENUE, RM 7M
SAN FRANCISCO, CA 94110
San Francisco County (415) 206-5612
DR. HARINI SARATHY MBBS
Internal Medicine (Nephrology)
1001 POTRERO AVENUE, WARD 17 DIALYSIS CLINIC, BLDG. 100, 3RD FL.
SAN FRANCISCO, CA 94110
San Francisco County (628) 206-8242

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 Kirsten Day's NPI number?

The NPI number for Kirsten Day is 1730270323. It was assigned to this individual provider in the NPPES registry on September 27, 2006.

Where is Kirsten Day located?

Kirsten Day practices at 1001 Potrero Avenue Bldg 80 Ward 83, San Francisco, CA 94110. The listed phone number is (415) 206-8651.

What is Kirsten Day's specialty?

The primary specialty registered for this NPI is Family Medicine with taxonomy code 207Q00000X.

Is Kirsten Day enrolled in Medicare?

Yes. Kirsten Day is registered in the Medicare PECOS enrollment system.

Which organizations bill Medicare for Kirsten Day's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Kirsten Day 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 Kirsten Day'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 Kirsten Day was last updated on July 8, 2007. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 19 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.