Mary Ellen Lemieux, J.D., LCSW
NPI 1134517600 · Clinical Social Worker · Palo Alto, CA
Enrolled with Medicare as Practitioner - Clinical Social Worker · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Mary Ellen Lemieux, J.D., LCSW is a Clinical Social Worker provider in Palo Alto, CA (NPI 1134517600).
Provider details
- NPI number
- 1134517600
- Entity type
- Individual
- Primary specialty
- Clinical Social WorkerBehavioral Health & Social Service Providers
- Credential
- J.D., LCSW
- Sex
- Female
- Sole proprietor
- Yes
- License
- 11557310-3501 (UT)
Specialties & taxonomies
Behavioral Health & Social Service Providers
Behavioral Health & Social Service Providers
Behavioral Health & Social Service Providers
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure38% of score
11 yrs in NPPES registry
- Profile completeness38% of score
100% of core fields populated
- Practice footprint23% of score
2 documented practice locations
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
Additional practice locations (1)
- 31545 Aspen Ridge RdSteamboat Springs, CO 80487-9243Phone: (650) 346-7698
Registry dates
- Enumerated
- 2015-01-06
- Last updated
- 2023-10-26
- Certified
- 2023-10-26
Frequently asked questions
- What is Mary Ellen Lemieux's NPI number?
- Mary Ellen Lemieux's National Provider Identifier (NPI) is 1134517600, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Mary Ellen Lemieux's specialty?
- Mary Ellen Lemieux is listed in the NPPES registry with a primary specialty of Clinical Social Worker (Behavioral Health & Social Service Providers).
- Where is Mary Ellen Lemieux located?
- Mary Ellen Lemieux's practice location on file with NPPES is 518 Hamilton Ave, Palo Alto, CA 94301-2011.
- What is Mary Ellen Lemieux's phone number?
- The practice phone number listed in the NPPES registry for Mary Ellen Lemieux is (650) 346-7698.
- Does Mary Ellen Lemieux accept Medicare?
- Mary Ellen Lemieux is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Mary Ellen Lemieux's NPI active?
- Yes — Mary Ellen Lemieux's NPI (1134517600) is active in the NPPES registry as of the last update on 2023-10-26.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.