Mara Susan Williams
Adult Health Nurse Practitioner · Napa, CA
Mara Susan Williams is an adult health nurse practitioner with a practice address in Napa, California, and NPI 1861544249, issued on Jan 17, 2007. Check the license (California 345522, as entered in NPPES) with the California board that licenses this profession; the federal record below is the public data PlainDoctor holds for this provider.
- Name
- Mara Susan Williams
- Primary taxonomy
- Adult Health Nurse Practitioner 363LA2200X
- License number
- 345522 CA
Self-reported in NPPES; status is on the state search - Practice location
- 3417 Valle Verde Dr, Napa, CA 94558
- Phone
- (707) 255-4172
- Enumerated
- Jan 17, 2007
- Record last updated
- Mar 7, 2023
- Fax
- (707) 255-2605
- Entity
- Type 1 · individual
8 nearest adult health nurse practitioner records → All 1,405 in California → Look up another NPI →
Also registered at 3417 Valle Verde Dr
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify Mara Susan Williams in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWhich California board licenses this profession
Search for license 345522Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
Mara Susan Williams among 1,405 adult health nurse practitioner records in California
Mara Susan Williams is one of 1,405 adult health nurse practitioner records with a practice address in California. 56% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does not. Its NPI, issued in 2007, is newer than 18% of them.
- NPI issued2007 · 18% of these records are older, 70% newer
- In a Medicare fileNo · 56% of these records are
- In the CMS Doctors and Clinicians fileNo · 31% of these records are
- Record last updated2023 · 62% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 363LA2200X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Adult Health Nurse Practitioner providers in California
There are 1,405 adult health nurse practitioner records in California. No Medicare prescribing, quality score, industry payment or hospital affiliation is published for this NPI.
All 1,405 in California → Every provider in Napa → Adult Health Nurse Practitioner nationwide →
The 8 adult health nurse practitioner records with the nearest ZIP codes
- Melissa Datu, APNNapa, CA 945581144572876
- Candy Hanratty, RN, NPNapa, CA 945581154567147
- Janet Healy, N.P.Napa, CA 945581811089857
- Heather Maine, FNP-BCNapa, CA 945581689472342
- Violeta De Haro, AGPCNP-BCNapa, CA 945591669308854
- Yasmine Perdue, DNP, FNPNewark, CA 945601023608304
- Erin Perkins, NPMoraga, CA 945561457573735
- Bernardita Roe, NPNewark, CA 945601912268145
Common questions
What is Mara Susan Williams's NPI number?
Mara Susan Williams's National Provider Identifier (NPI) is 1861544249, issued on Jan 17, 2007. An NPI identifies a provider in billing; it is not a license.
Where is Mara Susan Williams located?
The NPPES record lists a practice address at 3417 Valle Verde Dr, Napa, CA, 94558. Phone: (707) 255-4172. Providers update this record themselves, so call before visiting.
How can I verify Mara Susan Williams's license?
NPPES lists California license number 345522, as entered by the provider. Search the California board that licenses this profession; the NPPES record confirms identity only.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. An NPI identifies who bills; it is not a license.
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.