Alyssa Callahan, MS RDN
NPI 1225553936 · Registered Dietitian · Thousand Oaks, CA
Alyssa Callahan, MS RDN is a Registered Dietitian provider in Thousand Oaks, CA (NPI 1225553936).
Provider details
- NPI number
- 1225553936
- Entity type
- Individual
- Primary specialty
- Registered DietitianDietary & Nutritional Service Providers
- Credential
- MS RDN
- Sex
- Female
- Sole proprietor
- Yes
- License
- 86064070
Specialties & taxonomies
Dietary & Nutritional Service Providers
- Registered Dietitian133V00000X
Dietary & Nutritional Service Providers
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure38% of score
8 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
- 2017-08-03
- Last updated
- 2022-02-28
- Certified
- 2022-02-28
Frequently asked questions
- What is Alyssa Callahan's NPI number?
- Alyssa Callahan's National Provider Identifier (NPI) is 1225553936, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Alyssa Callahan's specialty?
- Alyssa Callahan is listed in the NPPES registry with a primary specialty of Registered Dietitian (Dietary & Nutritional Service Providers).
- Where is Alyssa Callahan located?
- Alyssa Callahan's practice location on file with NPPES is 509 Marin St Ste 228, Thousand Oaks, CA 91360-4231.
- What is Alyssa Callahan's phone number?
- The practice phone number listed in the NPPES registry for Alyssa Callahan is (805) 267-9338.
- Is Alyssa Callahan's NPI active?
- Yes — Alyssa Callahan's NPI (1225553936) is active in the NPPES registry as of the last update on 2022-02-28.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.