WILLIAM DAVID ALONSO ARIAS
NPI 1275822702
Anesthesiology in Las Vegas, NV

Q: What is William Alonso Arias's NPI number?

The NPI number for William Alonso Arias is 1275822702. It was assigned to this individual provider in the NPPES registry on April 5, 2011.

Q: What is William Alonso Arias's specialty?

The primary specialty registered for this NPI is Anesthesiology with taxonomy code 207L00000X.

Active since April 05, 2011PECOS Enrolled

2136 E DESERT INN RD STE A, LAS VEGAS, NV 89169(917) 684-8221 Get Directions Write a Review

NPPES record last updated: February 2, 2016. Verified against the NPPES registry weekly; last sync: October 25, 2026.

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About William David Alonso Arias NPPES

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

WILLIAM DAVID ALONSO ARIAS (NPI 1275822702) is an individual anesthesiology provider in Las Vegas, Nevada, licensed in Nevada (16233) and active in the NPI registry since April 2011. He is enrolled in Medicare PECOS.

NPPES Registry Identity

NPI1275822702

Entity TypeIndividualMale

Primary Taxonomy207L00000X

Provider Legal NameWILLIAM DAVID ALONSO ARIAS

Location Address2136 E DESERT INN RD STE ALas Vegas, NV 89169-3247

Mailing Address2136 E Desert Inn Rd Ste ALas Vegas, NV 89169-3247 · (917) 684-8221

Phone(917) 684-8221

Sole ProprietorYes

Enumeration DateApril 5, 2011

Last NPPES UpdateFebruary 2, 2016

✔ NPI 1275822702 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyAnesthesiologyAllopathic & Osteopathic Physicians

Taxonomy Code207L00000X

License✔ Licensed in NV · 16233

Definition

An anesthesiologist is trained to provide pain relief and maintenance, or restoration, of a stable condition during and immediately following an operation or an obstetric or diagnostic procedure. The anesthesiologist assesses the risk of the patient undergoing surgery and optimizes the patient's condition prior to, during and after surgery. In addition to these management responsibilities, the anesthesiologist provides medical management and consultation in pain management and critical care medicine. Anesthesiologists diagnose and treat acute, long-standing and cancer pain problems; diagnose and treat patients with critical illnesses or severe injuries; direct resuscitation in the care of patients with cardiac or respiratory emergencies, including the need for artificial ventilation; and supervise post-anesthesia recovery.

2136 E DESERT INN RD STE A, Las Vegas, NV 89169

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Medicare Participation & PECOS CMS

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

Medicare Enrollment Status

✔

Enrolled in Medicare (PECOS)

William David Alonso Arias 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 Alonso Arias reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.

Signify Health Medical Associates, PLLC

1,064 mi

General Practice

4055 VALLEY VIEW LN STE 700
Dallas, TX 75244

Reassigned Medicare billing, Washington enrollment
317 clinicians in this Medicare group

NPI 1750845863 (972) 715-3800

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

Other Providers at the Same Location NPPES

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

OSAMA HAIKAL MD LTD

Specialist

2136 E DESERT INN RD STE A
LAS VEGAS, NV 89169

Clark County (702) 734-0505

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 Alonso Arias's NPI number?

The NPI number for William Alonso Arias is 1275822702. It was assigned to this individual provider in the NPPES registry on April 5, 2011.

Where is William Alonso Arias located?

William Alonso Arias practices at 2136 E Desert Inn Rd Ste A, Las Vegas, NV 89169. The listed phone number is (917) 684-8221.

What is William Alonso Arias's specialty?

The primary specialty registered for this NPI is Anesthesiology with taxonomy code 207L00000X.

Is William Alonso Arias enrolled in Medicare?

Yes. William Alonso Arias is registered in the Medicare PECOS enrollment system.

Which organization bills Medicare for William Alonso Arias's services?

According to the CMS Revalidation Reassignment List (October 2026 release), William Alonso Arias reassigns Medicare benefits to Signify Health Medical Associates, PLLC (Dallas, 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 Alonso Arias's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.

When was this NPI record last updated?

The NPPES record for William Alonso Arias was last updated on February 2, 2016. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 10 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.