Cathy Steirn
NPI 1356428015 · Family Nurse Practitioner · Martinez, CA
Enrolled with Medicare as Order and Referring Only - Nurse Practitioner · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Cathy Steirn is a Family Nurse Practitioner provider in Martinez, CA (NPI 1356428015).
Provider details
- NPI number
- 1356428015
- Entity type
- Individual
- Primary specialty
- Family Nurse PractitionerPhysician Assistants & Advanced Practice Nursing Providers
- Sex
- Female
- Sole proprietor
- Yes
- License
- RN232217 (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
- 2006-11-01
- Last updated
- 2007-07-08
Frequently asked questions
- What is Cathy Steirn's NPI number?
- Cathy Steirn's National Provider Identifier (NPI) is 1356428015, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Cathy Steirn's specialty?
- Cathy Steirn is listed in the NPPES registry with a primary specialty of Family Nurse Practitioner (Physician Assistants & Advanced Practice Nursing Providers).
- Where is Cathy Steirn located?
- Cathy Steirn's practice location on file with NPPES is 2500 Alhambra Ave, Martinez, CA 94553-3156.
- What is Cathy Steirn's phone number?
- The practice phone number listed in the NPPES registry for Cathy Steirn is (925) 370-5110.
- Does Cathy Steirn accept Medicare?
- Cathy Steirn is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Cathy Steirn's NPI active?
- Yes — Cathy Steirn's NPI (1356428015) 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.