Heidi Larsen, MD
NPI 1275611055 · Internal Medicine Physician · Oakland, CA
Enrolled with Medicare as Practitioner - Internal Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Heidi Larsen, MD is a Internal Medicine Physician provider in Oakland, CA (NPI 1275611055).
Provider details
- NPI number
- 1275611055
- Entity type
- Individual
- Primary specialty
- Internal Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Female
- Sole proprietor
- No
- License
- G75008 (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
- 2006-11-01
- Last updated
- 2021-12-13
Frequently asked questions
- What is Heidi Larsen's NPI number?
- Heidi Larsen's National Provider Identifier (NPI) is 1275611055, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Heidi Larsen's specialty?
- Heidi Larsen is listed in the NPPES registry with a primary specialty of Internal Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Heidi Larsen located?
- Heidi Larsen's practice location on file with NPPES is 275 W Macarthur Blvd, Oakland, CA 94611-5641.
- What is Heidi Larsen's phone number?
- The practice phone number listed in the NPPES registry for Heidi Larsen is (510) 752-1000.
- Does Heidi Larsen accept Medicare?
- Heidi Larsen is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Heidi Larsen's NPI active?
- Yes — Heidi Larsen's NPI (1275611055) is active in the NPPES registry as of the last update on 2021-12-13.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.