WILLIAM J MAST FNP-C
NPI 1659089811
Nurse Practitioner - Family in Greenville, TX

Active since November 07, 2022PECOS EnrolledAccepts Medicare Assignment
82.03/100
CMS Quality Rating
3900 JOE RAMSEY BLVD E STE 6, GREENVILLE, TX 75401(903) 455-1100(903) 455-1114 Get Directions Write a Review

NPPES record last updated: December 8, 2025. Verified against the NPPES registry weekly; last sync: August 16, 2026.

Record update history: Dec 8, 2025, Nov 7, 2022 (2 updates tracked since 2022).

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

NPI1659089811
Entity TypeIndividualMale
Primary Taxonomy363LF0000X
Provider Legal NameWILLIAM J MASTCredential: FNP-C
Location Address3900 JOE RAMSEY BLVD E STE 6Greenville, TX 75401-7705
Mailing Address1790 N Stonebridge DrMckinney, TX 75071-7437 · (972) 390-9002 · Fax (972) 984-7988
Fax(903) 455-1114
Sole ProprietorNo
Medical School CMSOtherGraduated 2022
Enumeration DateNovember 7, 2022
Last NPPES UpdateDecember 8, 20252 updates tracked since enumeration
NPPES CertifiedDecember 8, 2025
NPI 1659089811 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

Primary SpecialtyNurse Practitioner · FamilyPhysician Assistants & Advanced Practice Nursing Providers
Taxonomy Code363LF0000X
License Licensed in TX · 1098502
3900 JOE RAMSEY BLVD E STE 6, Greenville, TX 75401

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.

PECOS PAC ID3779952320
PECOS Enrollment IDI20221203000591
Eligible to Order & Refer Part B Labs & Imaging Durable Medical Equipment Home Health Agency Power Mobility DevicesPer the CMS Ordering and Referring file. Eligibility means Medicare pays claims that this provider orders or refers for these categories.

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.

Destruction of precancer skin growth, 2-14 growths 17003
This procedure involves removing 2-14 precancerous skin growths. The growths are treated to prevent them from potentially developing into skin cancer. The process is safe, with minimal discomfort, and promotes healthier skin.
2,557 services425 patients
Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more 99213
This is a routine visit for patients who have already been seen by the healthcare provider. During this approximately 20-29 minute appointment, your health status will be evaluated and any necessary treatments or tests will be discussed. It's a chance to address any health concerns you may have.
1,064 services703 patients
Destruction of precancer skin growth, 1 growth 17000
"Destruction of precancer skin growth" is a procedure that eliminates a single precancerous skin growth. This is done to prevent it from developing into skin cancer. The growth may be removed using various methods such as cryotherapy (freezing), laser therapy, or topical medications.
1,013 services639 patients
Destruction of skin growth, 1-14 growths 17110
"Destruction of skin growth" refers to a procedure where 1-14 abnormal skin growths are removed. This is done using methods such as freezing, burning, or laser therapy. It helps prevent the growth from causing discomfort or turning into a more serious condition.
735 services521 patients
Biopsy of related skin growth, first growth 11102
A biopsy of a skin growth involves taking a small sample of the growth to examine it under a microscope. This helps determine if the growth is harmful. The procedure is typically quick, with minimal discomfort. It's a crucial step in ensuring your skin's health.
681 services549 patients
Established patient office or other outpatient visit with straightforward medical decision making, if using time, 10 minutes or more 99212
This is a routine check-up for patients who have previously seen the doctor. During this 10-19 minute visit, the doctor will review your health status, discuss any concerns, and manage ongoing treatments or medications. It's a chance to ensure your health is on track.
560 services426 patients

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, TX
3/5 CMS rating
OwnershipGovernment - Hospital District or Authority
CMS Certification Number450352
Location4215 Joe Ramsey Blvd EGreenville, TX 75401 · Hunt County
Emergency services Birthing friendly

Physician 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.

New Patient
$84.92 typical visit price
range $54.84 – $166.88
Typical copayment $21.23 (range $13.71 – $41.72)
Most-billed visit code 99203
Established Patient
$97.05 typical visit price
range $17.52 – $136.11
Typical copayment $24.26 (range $4.38 – $34.02)
Most-billed visit code 99214
Amounts reflect what Medicare beneficiaries in this ZIP area are typically charged for office visits. Patients with other coverage should check their individual plans.

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.

82.03/100
MIPS Final ScoreMerit-based Incentive Payment System · CMS Quality Payment Program
Scored as part of a group practice
Quality63.56
Promoting Interoperability97
Improvement Activities40
Cost79.05

Reported Quality Measures

Advance Care Plan
19%1,996 patients1/55-star benchmark: 100%
Documentation of Current Medications in the Medical Record
74%5,995 patients1/55-star benchmark: 100%
Preventive Care and Screening: Unhealthy Alcohol Use: Screening & Brief Counseling
Patients combinedPopulations: 72% · 1,444 patients
Patients screened: 76% · 1,444 patients
23%92 patients
Provide Patients Electronic Access to Their Health Information
94%3,422 patients4/55-star benchmark: 100%
Providers report different measures because they deliver different services; reporting more or less information is not a reflection of quality. Star ratings appear only where CMS assigned them.

Other Providers at the Same Location NPPES

Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.

Nurse Practitioner (Family)
3900 JOE RAMSEY BLVD E STE 6
GREENVILLE, TX 75401

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.