Rosa Won, M.D.
NPI 1952489718 · Maternal & Fetal Medicine Physician · Walnut Creek, CA
Enrolled with Medicare as Practitioner - Pediatric Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Rosa Won, M.D. is a Maternal & Fetal Medicine Physician provider in Walnut Creek, CA (NPI 1952489718).
Provider details
- NPI number
- 1952489718
- Entity type
- Individual
- Primary specialty
- Maternal & Fetal Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Female
- Sole proprietor
- No
- License
- A68625 (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
19 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
- 2006-11-01
- Last updated
- 2009-04-29
Frequently asked questions
- What is Rosa Won's NPI number?
- Rosa Won's National Provider Identifier (NPI) is 1952489718, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Rosa Won's specialty?
- Rosa Won is listed in the NPPES registry with a primary specialty of Maternal & Fetal Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Rosa Won located?
- Rosa Won's practice location on file with NPPES is 1656 N California Blvd, Walnut Creek, CA 94596-4180.
- What is Rosa Won's phone number?
- The practice phone number listed in the NPPES registry for Rosa Won is (925) 941-7955.
- Does Rosa Won accept Medicare?
- Rosa Won is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Rosa Won's NPI active?
- Yes — Rosa Won's NPI (1952489718) is active in the NPPES registry as of the last update on 2009-04-29.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.