Katherine To'O, M.D.
NPI 1821128844 · Diagnostic Radiology Physician · Palo Alto, CA
Enrolled with Medicare as Practitioner - Diagnostic Radiology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Katherine To'O, M.D. is a Diagnostic Radiology Physician provider in Palo Alto, CA (NPI 1821128844).
Provider details
- NPI number
- 1821128844
- Entity type
- Individual
- Primary specialty
- Diagnostic Radiology PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Female
- Sole proprietor
- No
- License
- A98082 (CA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure38% of score
19 yrs in NPPES registry
- Profile completeness38% of score
100% of core fields populated
- Practice footprint23% of score
1 documented practice location
Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our methodology.
Practice location
Mailing address
Registry dates
- Enumerated
- 2007-03-07
- Last updated
- 2025-12-11
- Certified
- 2025-12-11
Frequently asked questions
- What is Katherine To'O's NPI number?
- Katherine To'O's National Provider Identifier (NPI) is 1821128844, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Katherine To'O's specialty?
- Katherine To'O is listed in the NPPES registry with a primary specialty of Diagnostic Radiology Physician (Allopathic & Osteopathic Physicians).
- Where is Katherine To'O located?
- Katherine To'O's practice location on file with NPPES is 300 Pasteur Dr, Palo Alto, CA 94304-2203.
- What is Katherine To'O's phone number?
- The practice phone number listed in the NPPES registry for Katherine To'O is (323) 442-7450.
- Does Katherine To'O accept Medicare?
- Katherine To'O is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Katherine To'O's NPI active?
- Yes — Katherine To'O's NPI (1821128844) is active in the NPPES registry as of the last update on 2025-12-11.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.