Nicole Loeffler-Siu, M.D.
NPI 1568743722 · Pediatrics Physician · Vallejo, CA
Enrolled with Medicare as Practitioner - Pediatric Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Nicole Loeffler-Siu, M.D. is a Pediatrics Physician provider in Vallejo, CA (NPI 1568743722).
Provider details
- NPI number
- 1568743722
- Entity type
- Individual
- Primary specialty
- Pediatrics PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Female
- Sole proprietor
- Yes
- License
- A116209 (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
14 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
- 2011-09-01
- Last updated
- 2022-02-11
Frequently asked questions
- What is Nicole Loeffler-Siu's NPI number?
- Nicole Loeffler-Siu's National Provider Identifier (NPI) is 1568743722, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Nicole Loeffler-Siu's specialty?
- Nicole Loeffler-Siu is listed in the NPPES registry with a primary specialty of Pediatrics Physician (Allopathic & Osteopathic Physicians).
- Where is Nicole Loeffler-Siu located?
- Nicole Loeffler-Siu's practice location on file with NPPES is 975 Sereno Dr, Vallejo, CA 94589-2441.
- What is Nicole Loeffler-Siu's phone number?
- The practice phone number listed in the NPPES registry for Nicole Loeffler-Siu is (707) 651-1000.
- Does Nicole Loeffler-Siu accept Medicare?
- Nicole Loeffler-Siu is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Nicole Loeffler-Siu's NPI active?
- Yes — Nicole Loeffler-Siu's NPI (1568743722) is active in the NPPES registry as of the last update on 2022-02-11.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.