NPPES file of Aug 9, 2026

Rosa Hye-Kyung Won, M.D.

Maternal & Fetal Medicine Physician · Walnut Creek, CA

Rosa Hye-Kyung Won, M.D. is a maternal & fetal medicine physician with a practice address in Walnut Creek, California, and NPI 1952489718, issued on Nov 1, 2006. Check the license (California A68625, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.

Record from CMS NPPES, file of Aug 9, 2026 · method · Verify with CMS →

NPPES recordNPPES file of Aug 9, 2026
1952489718
Name
Rosa Hye-Kyung Won
Credential
M.D.
Primary taxonomy
Maternal & Fetal Medicine Physician 207VM0101X
License number
A68625 CA
Self-reported in NPPES; status is on the state search
Practice location
1656 N California Blvd, Walnut Creek, CA 94596
Phone
(925) 941-7955
Enumerated
Nov 1, 2006
Record last updated
Apr 29, 2009 (not updated in 17 years: call before relying on the address or phone)
Fax
(925) 941-7986
Medicaid ID
00A686250 CA
Medicare enrollment
Enrolled (PECOS I20040827001142); may accept Medicare assignment
Medical or professional school
New York Medical College, 1997
Entity
Type 1 · individual
Public record from CMS NPPES (open it on the CMS NPI Registry). Enrollment, assignment, school and telehealth: CMS Doctors and Clinicians file, Aug 2026. A record is not a license: verify it with the state board.
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8 nearest maternal & fetal medicine physician records → All 343 in California → Look up another NPI →

Also registered at 1656 N California Blvd

A shared address usually means a shared clinic or building; it does not show who employs whom.

  1. Rachael Cabreira, MSN-FNP-CFamily Nurse Practitioner1013047257
  2. Justin Collingham, M.D.Maternal & Fetal Medicine Physician1346382314
  3. Nancy Cook, NPAdult Health Nurse Practitioner1639314719
  4. Richard Weinstein, M.D.Internal Medicine Physician1972522407

Verify Rosa Hye-Kyung Won in five checks

  1. 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
  2. 2LicenseActive license and public ordersMedical Board of California
    Search for license A68625    Check the board
  3. 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
  4. 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
  5. 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
Open the California license search

PlainDoctor does not match the HHS-OIG exclusion list to individual records: most entries carry no NPI. Search the OIG exclusion list by name.

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Bills Medicare through one group practice

  1. Diablo Valley Perinatal Associates, IncWalnut Creek, CA

Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).

Rosa Hye-Kyung Won among 343 maternal & fetal medicine physician records in California

Rosa Hye-Kyung Won, M.D. is one of 343 maternal & fetal medicine physician records with a practice address in California. 61% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2006, is newer than 6% of them.

  • NPI issued2006 · 6% of these records are older, 52% newer
  • In a Medicare fileYes · 61% of these records are
  • In the CMS Doctors and Clinicians fileYes · 53% of these records are
  • Graduated1997 · median 2003 among the 181 with a school on file
  • Record last updated2009 · 51% of these records were not updated in five years or more

Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207VM0101X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).

Maternal & Fetal Medicine Physician providers in California

There are 343 maternal & fetal medicine physician records in California.

All 343 in California → Every provider in Walnut Creek → Maternal & Fetal Medicine Physician nationwide →

The 8 maternal & fetal medicine physician records with the nearest ZIP codes

  1. Justin Collingham, M.D.Walnut Creek, CA 945961346382314
  2. Jeffrey Maier, MDWalnut Creek, CA 945961932287034
  3. Vanitha Mohta, MDWalnut Creek, CA 945961528162245
  4. Jeffrey Traynor, M.D.Walnut Creek, CA 945981316981699
  5. Tiffany Hill, RNOakland, CA 946021023889987
  6. James Sargent, MDVallejo, CA 945891972858678
  7. Scott Puza, M.D.Union City, CA 945871972569838
  8. Michelle Adams, M.D.Oakland, CA 946091326058991

Common questions

What is Rosa Hye-Kyung Won, M.D.'s NPI number?

Rosa Hye-Kyung Won, M.D.'s National Provider Identifier (NPI) is 1952489718, issued on Nov 1, 2006. An NPI identifies a provider in billing; it is not a license.

Where is Rosa Hye-Kyung Won, M.D. located?

The NPPES record lists a practice address at 1656 N California Blvd, Walnut Creek, CA, 94596. Phone: (925) 941-7955. Providers update this record themselves, so call before visiting.

How can I verify Rosa Hye-Kyung Won, M.D.'s license?

NPPES lists California license number A68625, as entered by the provider. Search the Medical Board of California at https://www.mbc.ca.gov/License-Verification/default.aspx. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.

Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.

Written with AI tools from the named public files; every figure is computed from those files (how it is made).

Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.