Mary Williams, RN
NPI 1659459121 · Psychiatric/Mental Health Registered Nurse · Roseville, CA
Mary Williams, RN is a Psychiatric/Mental Health Registered Nurse provider in Roseville, CA (NPI 1659459121).
Provider details
- NPI number
- 1659459121
- Entity type
- Individual
- Primary specialty
- Psychiatric/Mental Health Registered NurseNursing Service Providers
- Credential
- RN
- Sex
- Female
- Sole proprietor
- No
- License
- 200960 (CA)
Specialties & taxonomies
Nursing Service Providers
Nursing Service Providers
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
- 2025-09-11
Frequently asked questions
- What is Mary Williams's NPI number?
- Mary Williams's National Provider Identifier (NPI) is 1659459121, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Mary Williams's specialty?
- Mary Williams is listed in the NPPES registry with a primary specialty of Psychiatric/Mental Health Registered Nurse (Nursing Service Providers).
- Where is Mary Williams located?
- Mary Williams's practice location on file with NPPES is 219 Estates Dr, Roseville, CA 95678-2391.
- What is Mary Williams's phone number?
- The practice phone number listed in the NPPES registry for Mary Williams is (916) 784-3555.
- Is Mary Williams's NPI active?
- Yes — Mary Williams's NPI (1659459121) is active in the NPPES registry as of the last update on 2025-09-11.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.