Mark Castellanet, M.D.
NPI 1538165782 · Cardiovascular Disease Physician · Los Alamitos, CA
Mark Castellanet, M.D. is a Cardiovascular Disease Physician provider in Los Alamitos, CA (NPI 1538165782).
Provider details
- NPI number
- 1538165782
- Entity type
- Individual
- Primary specialty
- Cardiovascular Disease PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- License
- GZ8642 (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
21 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
- 2005-06-22
- Last updated
- 2007-07-08
Frequently asked questions
- What is Mark Castellanet's NPI number?
- Mark Castellanet's National Provider Identifier (NPI) is 1538165782, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Mark Castellanet's specialty?
- Mark Castellanet is listed in the NPPES registry with a primary specialty of Cardiovascular Disease Physician (Allopathic & Osteopathic Physicians).
- Where is Mark Castellanet located?
- Mark Castellanet's practice location on file with NPPES is 3801 Katella Ave, Los Alamitos, CA 90720-3375.
- What is Mark Castellanet's phone number?
- The practice phone number listed in the NPPES registry for Mark Castellanet is (562) 598-3200.
- Is Mark Castellanet's NPI active?
- Yes — Mark Castellanet's NPI (1538165782) is active in the NPPES registry as of the last update on 2007-07-08.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.