Marianne Sia, MD
NPI 1255133583 · Student in an Organized Health Care Education/Training Program · San Francisco, CA
Enrolled with Medicare as Order and Referring Only - Internal Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Marianne Sia, MD is a Student in an Organized Health Care Education/Training Program provider in San Francisco, CA (NPI 1255133583).
Provider details
- NPI number
- 1255133583
- Entity type
- Individual
- Primary specialty
- Student in an Organized Health Care Education/Training ProgramStudent, Health Care
- Credential
- MD
- Sex
- Female
- Sole proprietor
- No
Specialties & taxonomies
Student, Health Care
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure38% of score
1 yr in NPPES 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
- 2025-03-26
- Last updated
- 2025-03-26
- Certified
- 2025-03-26
Frequently asked questions
- What is Marianne Sia's NPI number?
- Marianne Sia's National Provider Identifier (NPI) is 1255133583, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Marianne Sia's specialty?
- Marianne Sia is listed in the NPPES registry with a primary specialty of Student in an Organized Health Care Education/Training Program (Student, Health Care).
- Where is Marianne Sia located?
- Marianne Sia's practice location on file with NPPES is 505 Parnassus Ave, San Francisco, CA 94143-2204.
- What is Marianne Sia's phone number?
- The practice phone number listed in the NPPES registry for Marianne Sia is (415) 476-1528.
- Does Marianne Sia accept Medicare?
- Marianne Sia is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Marianne Sia's NPI active?
- Yes — Marianne Sia's NPI (1255133583) is active in the NPPES registry as of the last update on 2025-03-26.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.