John Westerdahl, PHD, MPH, RDN
NPI 1518784859 · Registered Dietitian · Simi Valley, CA
John Westerdahl, PHD, MPH, RDN is a Registered Dietitian provider in Simi Valley, CA (NPI 1518784859).
Provider details
- NPI number
- 1518784859
- Entity type
- Individual
- Primary specialty
- Registered DietitianDietary & Nutritional Service Providers
- Credential
- PHD, MPH, RDN
- Sex
- Male
- Sole proprietor
- Yes
- License
- 625522 (CA)
Specialties & taxonomies
Dietary & Nutritional Service Providers
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure38% of score
1 yr 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
- 2024-09-25
- Last updated
- 2024-09-25
- Certified
- 2024-09-25
Frequently asked questions
- What is John Westerdahl's NPI number?
- John Westerdahl's National Provider Identifier (NPI) is 1518784859, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is John Westerdahl's specialty?
- John Westerdahl is listed in the NPPES registry with a primary specialty of Registered Dietitian (Dietary & Nutritional Service Providers).
- Where is John Westerdahl located?
- John Westerdahl's practice location on file with NPPES is 543 Country Club Dr Ste B333, Simi Valley, CA 93065-0637.
- What is John Westerdahl's phone number?
- The practice phone number listed in the NPPES registry for John Westerdahl is (805) 722-7958.
- Is John Westerdahl's NPI active?
- Yes — John Westerdahl's NPI (1518784859) is active in the NPPES registry as of the last update on 2024-09-25.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.