Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of August 10, 2026.
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William J Mast, FNP-C

Individual provider Family Nurse Practitioner · NPI 1659089811

William J Mast, FNP-C is a Nurse Practitioner in Greenville, Texas. Qualified in 2022, 4 years ago. Practices with Matthew D Barrows MD PA, a 22-clinician group and accepts Medicare assignment. Licensed in Texas.

Years since qualifying
4
Licensed in
TX
In the registry since
2022
What do these letters mean?
FNP-C — Family Nurse Practitioner, Certified
A family nurse practitioner certified by the AANP.

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Practice location Address checks out

3900 Joe Ramsey Blvd E Ste 6
Greenville, TX 75401-7705
Phone: (903) 455-1100
Fax: (903) 455-1114
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Family Nurse Practitioner (primary) Taxonomy 363LF0000X · Licence 1098502 (TX)

Record details

NPI number1659089811
Entity typeIndividual (Type 1)
GenderMale
Credentials FNP-C
Sole proprietorNo
NPI enumeratedNovember 7, 2022
Last updated in NPPESDecember 8, 2025
Certification dateDecember 8, 2025

Medicare enrollment

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

Medicare specialtyNURSE PRACTITIONER
Medical schoolOTHER
Graduated 2022 (4 years in practice)
Group practice Matthew D Barrows Md Pa — 22 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount

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