Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of October 4, 2026.
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Mary Lyn Meier

Individual provider Speech-Language Pathologist · NPI 1932666849

Mary Lyn Meier is a Qualified Speech Language Pathologist in Fairfield, California. Qualified in 2022, 4 years ago. Practices with Northbay Health Medical Foundation, a 202-clinician group, works from 2 locations and accepts Medicare assignment. Licensed in California.

Years since qualifying
4
Licensed in
CA
In the registry since
2019
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Practice location Address checks out

1860 Pennsylvania Ave Ste 305
Fairfield, CA 94533-3550
Phone: (707) 646-4333
Fax: (707) 646-4833
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Additional practice locations (1)

  • 1425 S Main St, Walnut Creek, CA 94596-5318 — (925) 295-4130

Specialties & licences

Speech-Language Pathologist (primary) Taxonomy 235Z00000X · Licence 35331 (CA)

Record details

NPI number1932666849
Entity typeIndividual (Type 1)
GenderFemale
Sole proprietorYes
NPI enumeratedFebruary 27, 2019
Last updated in NPPESOctober 17, 2025
Certification dateOctober 17, 2025

Medicare enrollment

From the CMS Doctors & Clinicians file — this clinician is enrolled in Medicare.

Medicare specialtyQUALIFIED SPEECH LANGUAGE PATHOLOGIST
Medical schoolOTHER
Graduated 2022 (4 years in practice)
Group practice Northbay Health Medical Foundation — 202 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount
Practice locations2 on file with Medicare

Medicare patients and services, 2024

From the CMS Medicare Physician & Other Practitioners file for calendar year 2024. It counts Original Medicare patients only, so a practice that mostly sees Medicare Advantage or privately insured patients looks smaller here than it is.

Medicare patients32
Services billed 82 a service is one billed item, such as a visit, a test or a procedure
Average patient age69

Dollar amounts are not shown. What Medicare pays a practice is gross billings, before staff, premises and tax and including the cost of any drugs it administers, so it is not what a clinician earns.

Colleagues at Northbay Health Medical Foundation

Clinicians the CMS Doctors & Clinicians file lists under the same group practice. CMS counts 202 clinicians in the practice; 12 are shown here.

Other providers in Fairfield