Mary Ann Williamson, NP
Nurse Practitioner · Concord, CA
Mary Ann Williamson, NP is a nurse practitioner with a practice address in Concord, California, and NPI 1699042457, issued on Nov 22, 2011. Check the license (California 2400, as entered in NPPES) with the California board that licenses this profession; the Medicare figures below come from public CMS files.
- Name
- Mary Ann Williamson
- Credential
- NP
- Primary taxonomy
- Nurse Practitioner 363L00000X
- License number
- 2400 CA
Self-reported in NPPES; status is on the state search - Practice location
- 2185 Pacheco St, Concord, CA 94520
- Phone
- (925) 676-0505
- Enumerated
- Nov 22, 2011
- Record last updated
- Jul 30, 2015 (not updated in 11 years: call before relying on the address or phone)
- Fax
- (925) 676-2814
- Entity
- Type 1 · individual
8 nearest nurse practitioner records → All 8,223 in California → Look up another NPI →
Also registered at 2185 Pacheco St
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify Mary Ann Williamson in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWhich California board licenses this profession
Search for license 2400Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
Industry payments in 2024: $8.80
1 payment: food and beverage; the largest payer was Organon Llc. The 38,884 providers of this specialty with any payment received $791.64 on average. Payments are reported by manufacturers, not by the provider, and are not a sign of wrongdoing.
Source: CMS Open Payments, program year 2024 (openpaymentsdata.cms.gov); average among providers of this specialty with at least one payment.
Mary Ann Williamson among 8,223 nurse practitioner records in California
Mary Ann Williamson, NP is one of 8,223 nurse practitioner records with a practice address in California. 65% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2011, is newer than 34% of them.
- NPI issued2011 · 34% of these records are older, 63% newer
- In a Medicare fileYes · 65% of these records are
- In the CMS Doctors and Clinicians fileNo · 42% of these records are
- Record last updated2015 · 45% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 363L00000X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
37 nurse practitioner records list a practice address in Concord
They are 37 of the 9,328 NPPES records with a practice address in Concord, and 8,223 nurse practitioner records in California.
All 8,223 in California → Every provider in Concord → Nurse Practitioner nationwide →
The 8 nurse practitioner records with the nearest ZIP codes
- Irina Abovsky-Akkerman, NPConcord, CA 945201982769345
- Marie-Claire Barnaba, NPConcord, CA 945201518018696
- Christine Costa, NPConcord, CA 945201194875047
- Katrece Davis, NPConcord, CA 945201497800015
- Constance Dimidjian, NPConcord, CA 945201639224637
- Janet ElderConcord, CA 945201942352752
- Michelle Fahlsing, NPConcord, CA 945201124173117
- Elizabeth Gumas, NPConcord, CA 945201801843792
Common questions
What is Mary Ann Williamson, NP's NPI number?
Mary Ann Williamson, NP's National Provider Identifier (NPI) is 1699042457, issued on Nov 22, 2011. An NPI identifies a provider in billing; it is not a license.
Where is Mary Ann Williamson, NP located?
The NPPES record lists a practice address at 2185 Pacheco St, Concord, CA, 94520. Phone: (925) 676-0505. Providers update this record themselves, so call before visiting.
How can I verify Mary Ann Williamson, NP's license?
NPPES lists California license number 2400, 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. Medicare files from data.cms.gov. 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.