Mark Siazon
NPI 1861198657 · Adult Psychiatric/Mental Health Registered Nurse · Los Angeles, CA
Mark Siazon is a Adult Psychiatric/Mental Health Registered Nurse provider in Los Angeles, CA (NPI 1861198657).
Provider details
- NPI number
- 1861198657
- Entity type
- Individual
- Primary specialty
- Adult Psychiatric/Mental Health Registered NurseNursing Service Providers
- Sex
- Male
- Sole proprietor
- No
- License
- 95233611 (CA)
Specialties & taxonomies
Nursing Service Providers
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure38% of score
3 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
- 2023-02-02
- Last updated
- 2023-02-02
- Certified
- 2023-02-02
Frequently asked questions
- What is Mark Siazon's NPI number?
- Mark Siazon's National Provider Identifier (NPI) is 1861198657, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Mark Siazon's specialty?
- Mark Siazon is listed in the NPPES registry with a primary specialty of Adult Psychiatric/Mental Health Registered Nurse (Nursing Service Providers).
- Where is Mark Siazon located?
- Mark Siazon's practice location on file with NPPES is 1720 E Cesar E Chavez Ave, Los Angeles, CA 90033-2414.
- What is Mark Siazon's phone number?
- The practice phone number listed in the NPPES registry for Mark Siazon is (323) 268-5000.
- Is Mark Siazon's NPI active?
- Yes — Mark Siazon's NPI (1861198657) is active in the NPPES registry as of the last update on 2023-02-02.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.