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DR. CATHERINE KOSS M.D.
NPI 1861727950
Internal Medicine - Infectious Disease in San Francisco, CA

Active since October 08, 2009PECOS Enrolled
UCSF DEPARTMENT OF MEDICINE, 505 PARNASSUS AVENUE, SAN FRANCISCO, CA 94143(415) 476-1528 Get Directions Write a Review

NPPES record last updated: May 13, 2026. Verified against the NPPES registry weekly; last sync: October 25, 2026.

Record update history: May 13, 2026, May 6, 2019 (2 updates tracked since 2019).

About Dr. Catherine Koss M.d. NPPES

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

DR. CATHERINE KOSS M.D. (NPI 1861727950) is an individual infectious disease provider in San Francisco, California, licensed in California (A115493) and active in the NPI registry since October 2009. She is enrolled in Medicare PECOS and maintains a secondary practice location in San Francisco.

NPPES Registry Identity

NPI1861727950
Entity TypeIndividualFemale
Primary Taxonomy207RI0200X
Provider Legal NameDR. CATHERINE KOSSCredential: M.D.
Location AddressUCSF DEPARTMENT OF MEDICINE, 505 PARNASSUS AVENUESan Francisco, CA 94143-0001
Mailing AddressUcsf Department Of Medicine, 505 Parnassus AvenueSan Francisco, CA 94143-0001
Phone(415) 476-1528
Sole ProprietorNo
Enumeration DateOctober 8, 2009
Last NPPES UpdateMay 13, 20262 updates tracked since enumeration
NPPES CertifiedMay 13, 2026
✔ NPI 1861727950 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses 2

★ Primary SpecialtyInternal Medicine · Infectious DiseaseAllopathic & Osteopathic Physicians
Taxonomy Code207RI0200X
License✔ Licensed in CA · A115493
Definition
An internist who deals with infectious diseases of all types and in all organ systems. Conditions requiring selective use of antibiotics call for this special skill. This physician often diagnoses and treats AIDS patients and patients with fevers which have not been explained. Infectious disease specialists may also have expertise in preventive medicine and travel medicine.
Also ListedInternal MedicineTaxonomy 207R00000X · License A115493 (CA)
UCSF DEPARTMENT OF MEDICINE, San Francisco, CA 94143
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Secondary Practice Location 1

Location 1995 Potrero Ave., Bldg. 80, Ward 86, Fl. 6San Francisco, CA 94110-3518 · Phone (628) 206-2400 · Fax (628) 206-7514

Medicare Participation & PECOS CMS

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

Medicare Enrollment Status

✔

Enrolled in Medicare (PECOS)

Dr. Catherine Koss 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.

Medicare Billing Reassignments

2

Medicare enrollment records show Catherine Koss 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
0.7 mi
Mental Health (Including Community Mental Health Center)
3905 MISSION ST
San Francisco, CA 94112
  • Reassigned Medicare billing, California enrollment
  • 1,573 clinicians in this Medicare group
NPI 1639272008 (415) 337-4722
University Of California Sfgh Medical Group
2.3 mi
Hematology
1001 POTRERO AVENUE, BLDG 80 WARD 84
San Francisco, CA 94110
  • Reassigned Medicare billing, California enrollment
  • Also billed through NPI 1366417933 (California)
  • 78 clinicians in this Medicare group
NPI 1326013442 (628) 876-4082

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 94143 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 6

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

THO BOI TRAN MD
Student in an Organized Health Care Education/Training Program
UCSF DEPARTMENT OF MEDICINE, 505 PARNASSUS AVE., M1480
SAN FRANCISCO, CA 94143
San Francisco County (415) 476-1528
SARAH DOERNBERG MD
Internal Medicine
UCSF DEPARTMENT OF MEDICINE, 505 PARNASSUS AVE, ROOM M987
SAN FRANCISCO, CA 94143
San Francisco County (415) 476-1528
CLAUDIA SEE MD, MBA
Student in an Organized Health Care Education/Training Program
UCSF DEPARTMENT OF MEDICINE, 505 PARNASSUS AVE M1480
SAN FRANCISCO, CA 94143
San Francisco County (415) 476-1528
GINO MICHAEL DETTORRE MD
Student in an Organized Health Care Education/Training Program
UCSF DEPARTMENT OF MEDICINE, 505 PARNASSUS AVE, M1480
SAN FRANCISCO, CA 94143
San Francisco County (415) 476-1528
MARY ELIZABETH JAME
Student in an Organized Health Care Education/Training Program
UCSF DEPARTMENT OF MEDICINE, 505 PARNASSUS AVENUE, ROOM M-987
SAN FRANCISCO, CA 94143
San Francisco County (415) 476-1528
NITIKA GUPTA MD
Student in an Organized Health Care Education/Training Program
UCSF DEPARTMENT OF MEDICINE, 505 PARNASSUS AVE, M1480
SAN FRANCISCO, CA 94143
San Francisco County (415) 476-1528

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 Catherine Koss's NPI number?

The NPI number for Catherine Koss is 1861727950. It was assigned to this individual provider in the NPPES registry on October 8, 2009.

Where is Catherine Koss located?

Catherine Koss practices at Ucsf Department Of Medicine 505 Parnassus Avenue, San Francisco, CA 94143. The listed phone number is (415) 476-1528.

What is Catherine Koss's specialty?

The primary specialty registered for this NPI is Internal Medicine, specializing in Infectious Disease, with taxonomy code 207RI0200X.

Is Catherine Koss enrolled in Medicare?

Yes. Catherine Koss is registered in the Medicare PECOS enrollment system.

Which organizations bill Medicare for Catherine Koss's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Catherine Koss 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 Catherine Koss'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 Catherine Koss was last updated on May 13, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 5 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.