Mary Tierney, NP
NPI 1245301571 · Nurse Practitioner · San Mateo, CA
Enrolled with Medicare as Practitioner - Nurse Practitioner · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Mary Tierney, NP is a Nurse Practitioner provider in San Mateo, CA (NPI 1245301571).
Provider details
- NPI number
- 1245301571
- Entity type
- Individual
- Primary specialty
- Nurse PractitionerPhysician Assistants & Advanced Practice Nursing Providers
- Credential
- NP
- Sex
- Female
- Sole proprietor
- No
- License
- NP8020 (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 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
- 2006-11-10
- Last updated
- 2007-07-08
Frequently asked questions
- What is Mary Tierney's NPI number?
- Mary Tierney's National Provider Identifier (NPI) is 1245301571, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Mary Tierney's specialty?
- Mary Tierney is listed in the NPPES registry with a primary specialty of Nurse Practitioner (Physician Assistants & Advanced Practice Nursing Providers).
- Where is Mary Tierney located?
- Mary Tierney's practice location on file with NPPES is 222 W 39th Ave, San Mateo, CA 94403-4364.
- What is Mary Tierney's phone number?
- The practice phone number listed in the NPPES registry for Mary Tierney is (650) 573-2222.
- Does Mary Tierney accept Medicare?
- Mary Tierney is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Mary Tierney's NPI active?
- Yes — Mary Tierney's NPI (1245301571) is active in the NPPES registry as of the last update on 2007-07-08.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.