ELLEN O'MALLEY KATO FNP
NPI 1598044844
Nurse Practitioner in San Francisco, CA
About Ellen O'malley Kato Fnp NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
ELLEN O'MALLEY KATO FNP (NPI 1598044844) is an individual nurse practitioner in San Francisco, California, licensed in California (21049) and active in the NPI registry since August 2011. She is enrolled in Medicare PECOS and is a graduate of Other (2011).
NPPES Registry Identity
Specialties & Licenses 3
Medicare Participation & PECOS CMS
Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.
Medicare Enrollment Status
Enrolled in Medicare and accepts Medicare assignment
Ellen O'malley Kato Fnp is registered in PECOS and agrees to accept the Medicare-approved amount as full payment. Medicare patients are not billed beyond the standard deductible and coinsurance.
Medicare Billing Reassignment
Medicare enrollment records show Ellen Kato reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.
San Francisco, CA 94111
- Reassigned Medicare billing, California enrollment
- 291 clinicians in this Medicare group
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 94111 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.
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.
SAN FRANCISCO, CA 94111
SAN FRANCISCO, CA 94111
SAN FRANCISCO, CA 94111
SAN FRANCISCO, CA 94111
SAN FRANCISCO, CA 94111
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 Ellen Kato's NPI number?
The NPI number for Ellen Kato is 1598044844. It was assigned to this individual provider in the NPPES registry on August 4, 2011.
Where is Ellen Kato located?
Ellen Kato practices at 2 Embarcadero Ctr Lbby Level, San Francisco, CA 94111. The listed phone number is (888) 663-6331.
What is Ellen Kato's specialty?
The primary specialty registered for this NPI is Nurse Practitioner with taxonomy code 363L00000X.
Is Ellen Kato enrolled in Medicare?
Yes. Ellen Kato is registered in the Medicare PECOS system and accepts Medicare assignment, which means accepting the Medicare-approved amount as payment in full for covered services.
Which organization bills Medicare for Ellen Kato's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Ellen Kato reassigns Medicare benefits to One 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 Ellen Kato'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 Ellen Kato was last updated on March 17, 2025. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 19 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.
# Ellen O'malley Kato, FNP · NPI 1598044844
Nurse Practitioner physician in San Francisco, California. Individual provider, active in the CMS NPPES registry since August 4, 2011.
## Identity
- **NPI:** 1598044844 (Entity type: Individual)
- **Enumerated:** August 4, 2011
- **Primary specialty:** Nurse Practitioner · taxonomy 363L00000X
- **State license:** 21049 (California)
- **Sole proprietor:** No
## Practice location
- **Address:** 2 EMBARCADERO CTR LBBY LEVEL, San Francisco, CA 94111-3823
- **Phone:** (888) 663-6331 · **Fax:** (415) 252-7176
## Medicare
- **Medicare:** Enrolled (PECOS); accepts Medicare assignment
- **Ordering & referring:** eligible for Part B labs & imaging, durable medical equipment, home health, power mobility devices
- **Bills Medicare through:** One Medical Group, Inc. (NPI 1467781641, San Francisco, CA), under Medicare reassignment (form CMS-855R) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Other, class of 2011
## Record status
- **NPPES last updated:** March 17, 2025
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Source: [NPI Profile](https://npiprofile.com/npi/1598044844) · Data from the CMS NPPES public registry.