WILLIAM J MAST FNP-C
NPI 1659089811
Nurse Practitioner - Family in Greenville, TX
About William J Mast Fnp-c NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
WILLIAM J MAST FNP-C (NPI 1659089811) is an individual family provider in Greenville, Texas, licensed in Texas (1098502) and active in the NPI registry since November 2022. He is enrolled in Medicare PECOS, is affiliated with Hunt Regional Medical Center, and is a graduate of Other (2022).
NPPES Registry Identity
Specialties & Licenses
Accepted Insurance
Medicare Participation & PECOS CMS
Medicare enrollment, assignment, and ordering and referring status from the CMS PECOS system.
Medicare Enrollment Status
Enrolled in Medicare and accepts Medicare assignment
William J Mast Fnp-c is registered in PECOS and agrees to accept the Medicare-approved amount as full payment. Medicare patients are not billed beyond the standard deductible and coinsurance.
Areas of Expertise CMS Part B claims 21
Services this provider delivered to Medicare fee-for-service patients, from the CMS Medicare utilization data. Higher counts generally reflect more experience with a service; care delivered outside Medicare is not included.
Hospital Affiliations CMS Care Compare
Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.
Hunt Regional Medical Center
Acute Care Hospitals · Greenville, TXPhysician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 75401 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.
Medicare Quality Performance CMS QPP · MIPS
Performance in the CMS Quality Payment Program: the MIPS final score across four weighted categories, and the individual quality measures reported to Medicare.
Reported Quality Measures
Other Providers at the Same Location NPPES
Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.
Frequently Asked Questions NPPES & CMS
Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.
What is William Mast's NPI number?
The NPI number for William Mast is 1659089811. It was assigned to this individual provider in the NPPES registry on November 7, 2022.
Where is William Mast located?
William Mast practices at 3900 Joe Ramsey Blvd E Ste 6, Greenville, TX 75401. The listed phone number is (903) 455-1100.
What is William Mast's specialty?
The primary specialty registered for this NPI is Nurse Practitioner, specializing in Family, with taxonomy code 363LF0000X.
Is William Mast enrolled in Medicare?
Yes. William Mast is registered in the Medicare PECOS system and accepts Medicare assignment, which means accepting the Medicare-approved amount as payment in full for covered services.
What insurance does William Mast accept?
Health plans from Ambetter from Arizona Complete Health, Ambetter from Arkansas Health & Wellness, Ambetter from Louisiana Healthcare Connections, Ambetter from Superior HealthPlan and Ambetter of Oklahoma and 3 other insurers list William Mast as in-network in at least one marketplace plan. Coverage varies by plan and year; verify with the insurer or the provider before a visit.
Is William Mast affiliated with any hospitals?
According to CMS data, William Mast is affiliated with Hunt Regional Medical Center.
When was this NPI record last updated?
The NPPES record for William Mast was last updated on December 8, 2025. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 8 months ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.