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WILLIAM AARON MASON FNP
NPI 1801553250
Nurse Practitioner - Family in Alpine, TX

Active since November 19, 2021PECOS Enrolled
1605 FORT DAVIS HIGHWAY, ALPINE, TX 79830(432) 837-4555 Get Directions Write a Review

NPPES record last updated: November 19, 2021. Verified against the NPPES registry weekly; last sync: November 01, 2026.

About William Aaron Mason Fnp NPPES

Official registry information on file with the National Plan and Provider Enumeration System.

WILLIAM AARON MASON FNP (NPI 1801553250) is an individual family provider in Alpine, Texas, licensed in Texas (1056981) and active in the NPI registry since November 2021. He is enrolled in Medicare PECOS.

NPPES Registry Identity

NPI1801553250
Entity TypeIndividualMale
Primary Taxonomy363LF0000X
Provider Legal NameWILLIAM AARON MASONCredential: FNP
Location Address1605 FORT DAVIS HIGHWAYAlpine, TX 79830
Mailing Address1605 Fort Davis HighwayAlpine, TX 79830 · (830) 776-3977
Phone(432) 837-4555
Sole ProprietorNo
Enumeration DateNovember 19, 2021
NPPES CertifiedOctober 15, 2021
✔ NPI 1801553250 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 · 1056981
1605 FORT DAVIS HIGHWAY, Alpine, TX 79830
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Accepted Insurance

The full list of accepted plans is on the Insurance tab. Issuers include Ambetter from Arizona Complete Health, Ambetter from Arkansas Health & Wellness, Ambetter from Louisiana Healthcare Connections and more.Insurance ›

Medicare Participation & PECOS CMS

Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.

Medicare Enrollment Status

✔

Enrolled in Medicare (PECOS)

William Aaron Mason Fnp is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).

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.

Medicare Billing Reassignment

Medicare enrollment records show William Mason reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.

United Medical Centers
223 mi
Federally Qualified Health Center (FQHC)
2525 N VETERANS BLVD
Eagle Pass, TX 78852
  • Reassigned Medicare billing, Texas enrollment
  • 76 clinicians in this Medicare group
NPI 1710980669 (830) 773-5358

Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 79830 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.

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 Mason's NPI number?

The NPI number for William Mason is 1801553250. It was assigned to this individual provider in the NPPES registry on November 19, 2021.

Where is William Mason located?

William Mason practices at 1605 Fort Davis Highway, Alpine, TX 79830. The listed phone number is (432) 837-4555.

What is William Mason's specialty?

The primary specialty registered for this NPI is Nurse Practitioner, specializing in Family, with taxonomy code 363LF0000X.

Is William Mason enrolled in Medicare?

Yes. William Mason is registered in the Medicare PECOS enrollment system.

Which organization bills Medicare for William Mason's services?

According to the CMS Revalidation Reassignment List (October 2026 release), William Mason reassigns Medicare benefits to United Medical Centers (Eagle Pass, TX). The reassignment is filed with Medicare on form CMS-855R, signed by both the clinician and the organization, and lets the organization bill Medicare and receive payment for William Mason's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.

What insurance does William Mason 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 1 other insurer list William Mason 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.

When was this NPI record last updated?

The NPPES record for William Mason was last updated on November 19, 2021. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 4 years 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.