Maria Siu, D.O.
NPI 1144513862 · Obstetrics & Gynecology Physician · Pomona, CA
Enrolled with Medicare as Practitioner - Obstetrics/Gynecology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Maria Siu, D.O. is a Obstetrics & Gynecology Physician provider in Pomona, CA (NPI 1144513862).
Provider details
- NPI number
- 1144513862
- Entity type
- Individual
- Primary specialty
- Obstetrics & Gynecology PhysicianAllopathic & Osteopathic Physicians
- Credential
- D.O.
- Sex
- Female
- Sole proprietor
- Yes
- License
- P26504 (MD)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure38% of score
15 yrs in NPPES registry
- Profile completeness38% of score
100% of core fields populated
- Practice footprint23% of score
2 documented practice locations
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
Additional practice locations (1)
- 756 N Euclid Ave Ste aOntario, CA 91762-2767Phone: (909) 395-0030
Registry dates
- Enumerated
- 2011-05-27
- Last updated
- 2018-05-08
Frequently asked questions
- What is Maria Siu's NPI number?
- Maria Siu's National Provider Identifier (NPI) is 1144513862, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Maria Siu's specialty?
- Maria Siu is listed in the NPPES registry with a primary specialty of Obstetrics & Gynecology Physician (Allopathic & Osteopathic Physicians).
- Where is Maria Siu located?
- Maria Siu's practice location on file with NPPES is 160 E Artesia St Ste 330, Pomona, CA 91767-2922.
- What is Maria Siu's phone number?
- The practice phone number listed in the NPPES registry for Maria Siu is (909) 622-5654.
- Does Maria Siu accept Medicare?
- Maria Siu is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Maria Siu's NPI active?
- Yes — Maria Siu's NPI (1144513862) is active in the NPPES registry as of the last update on 2018-05-08.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.