Kathryn Larsen, MD
NPI 1598845638 · Family Medicine Physician · Santa Ana, CA
Enrolled with Medicare as Practitioner - Family Practice · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Kathryn Larsen, MD is a Family Medicine Physician provider in Santa Ana, CA (NPI 1598845638).
Provider details
- NPI number
- 1598845638
- Entity type
- Individual
- Primary specialty
- Family Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Female
- Sole proprietor
- No
- License
- 000000G48790 (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
2 documented practice locations
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
Additional practice locations (1)
- Uci Medical Center101 the City Drive SouthOrange, CA 92868Phone: (714) 456-8978
Registry dates
- Enumerated
- 2006-10-16
- Last updated
- 2023-02-28
- Certified
- 2023-02-28
Frequently asked questions
- What is Kathryn Larsen's NPI number?
- Kathryn Larsen's National Provider Identifier (NPI) is 1598845638, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Kathryn Larsen's specialty?
- Kathryn Larsen is listed in the NPPES registry with a primary specialty of Family Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Kathryn Larsen located?
- Kathryn Larsen's practice location on file with NPPES is 800 N Main St, Santa Ana, CA 92701-3576.
- What is Kathryn Larsen's phone number?
- The practice phone number listed in the NPPES registry for Kathryn Larsen is (657) 282-6355.
- Does Kathryn Larsen accept Medicare?
- Kathryn Larsen is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Kathryn Larsen's NPI active?
- Yes — Kathryn Larsen's NPI (1598845638) is active in the NPPES registry as of the last update on 2023-02-28.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.