Kathryn Hallsten, M.D.
NPI 1184750861 · Internal Medicine Physician · Portola Valley, CA
Enrolled with Medicare as Order and Referring Only - Internal Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Kathryn Hallsten, M.D. is a Internal Medicine Physician provider in Portola Valley, CA (NPI 1184750861).
Provider details
- NPI number
- 1184750861
- Entity type
- Individual
- Primary specialty
- Internal Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Female
- Sole proprietor
- Yes
- License
- G60511 (CA)
Specialties & taxonomies
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
- 2007-02-26
- Last updated
- 2013-06-04
Frequently asked questions
- What is Kathryn Hallsten's NPI number?
- Kathryn Hallsten's National Provider Identifier (NPI) is 1184750861, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Kathryn Hallsten's specialty?
- Kathryn Hallsten is listed in the NPPES registry with a primary specialty of Internal Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Kathryn Hallsten located?
- Kathryn Hallsten's practice location on file with NPPES is 130 Portola Rd, Portola Valley, CA 94028-7825.
- What is Kathryn Hallsten's phone number?
- The practice phone number listed in the NPPES registry for Kathryn Hallsten is (650) 385-1970.
- Does Kathryn Hallsten accept Medicare?
- Kathryn Hallsten is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Kathryn Hallsten's NPI active?
- Yes — Kathryn Hallsten's NPI (1184750861) is active in the NPPES registry as of the last update on 2013-06-04.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.