Guillermo Siordia
NPI 1689534547 · Day Training/Habilitation Specialist · Downey, CA
Guillermo Siordia is a Day Training/Habilitation Specialist provider in Downey, CA (NPI 1689534547).
Provider details
- NPI number
- 1689534547
- Entity type
- Individual
- Primary specialty
- Day Training/Habilitation SpecialistNursing Service Related Providers
- Sex
- Male
- Sole proprietor
- No
Specialties & taxonomies
Nursing Service Related Providers
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure38% of score
Under 1 yr in registry
- Profile completeness38% of score
83% 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
- 2025-11-13
- Last updated
- 2025-11-13
- Certified
- 2025-11-13
Frequently asked questions
- What is Guillermo Siordia's NPI number?
- Guillermo Siordia's National Provider Identifier (NPI) is 1689534547, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Guillermo Siordia's specialty?
- Guillermo Siordia is listed in the NPPES registry with a primary specialty of Day Training/Habilitation Specialist (Nursing Service Related Providers).
- Where is Guillermo Siordia located?
- Guillermo Siordia's practice location on file with NPPES is 9345 3/4 Washburn Rd, Downey, CA 90242-2910.
- What is Guillermo Siordia's phone number?
- The practice phone number listed in the NPPES registry for Guillermo Siordia is (562) 583-9207.
- Is Guillermo Siordia's NPI active?
- Yes — Guillermo Siordia's NPI (1689534547) is active in the NPPES registry as of the last update on 2025-11-13.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.