Mary Williamson, NP
NPI 1699042457 · Nurse Practitioner · Concord, CA
Mary Williamson, NP is a Nurse Practitioner provider in Concord, CA (NPI 1699042457).
Provider details
- NPI number
- 1699042457
- Entity type
- Individual
- Primary specialty
- Nurse PractitionerPhysician Assistants & Advanced Practice Nursing Providers
- Credential
- NP
- Sex
- Female
- Sole proprietor
- No
- License
- 2400 (CA)
Specialties & taxonomies
Physician Assistants & Advanced Practice Nursing Providers
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure33% of score
14 yrs in NPPES registry
- Profile completeness33% of score
100% of core fields populated
- Practice footprint20% of score
1 documented practice location
- Open Payments transparency13% of score
Has Open Payments disclosures (2024)
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.
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$9 across 1 record (Open Payments 2024)
Open Payments discloses payments and transfers of value (meals, travel, consulting, research, royalties) from drug and device makers to providers. This is a transparency signal, not a verdict — such payments are legal and common, and their presence is neither an endorsement nor a criticism. Source: CMS Open Payments, program year 2024.
Practice location
Mailing address
Registry dates
- Enumerated
- 2011-11-22
- Last updated
- 2015-07-30
Frequently asked questions
- What is Mary Williamson's NPI number?
- Mary Williamson's National Provider Identifier (NPI) is 1699042457, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Mary Williamson's specialty?
- Mary Williamson is listed in the NPPES registry with a primary specialty of Nurse Practitioner (Physician Assistants & Advanced Practice Nursing Providers).
- Where is Mary Williamson located?
- Mary Williamson's practice location on file with NPPES is 2185 Pacheco St, Concord, CA 94520-2309.
- What is Mary Williamson's phone number?
- The practice phone number listed in the NPPES registry for Mary Williamson is (925) 676-0505.
- Is Mary Williamson's NPI active?
- Yes — Mary Williamson's NPI (1699042457) is active in the NPPES registry as of the last update on 2015-07-30.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.