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Recently Updated NPI Information — some details in this NPI profile have been updated in the NPI registry within the last 60 days.

DUNCAN JAMES WILLIAMS DO
NPI 1225730781
Emergency Medicine in Las Vegas, NV

Active since March 20, 2023PECOS Enrolled
3186 S MARYLAND PKWY, LAS VEGAS, NV 89109(702) 961-5000 Get Directions Write a Review

NPPES record last updated: July 16, 2026. Verified against the NPPES registry weekly; last sync: August 02, 2026.

Record update history: Jul 16, 2026, Apr 30, 2026, Mar 20, 2023 (3 updates tracked since 2023).

About Duncan James Williams Do NPPES

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

DUNCAN JAMES WILLIAMS DO (NPI 1225730781) is an individual emergency medicine provider in Las Vegas, Nevada, licensed in Nevada (DO4122) and active in the NPI registry since March 2023. He is enrolled in Medicare PECOS and is a graduate of Other (2023).

NPPES Registry Identity

NPI1225730781
Entity TypeIndividualMale
Primary Taxonomy207P00000X
Provider Legal NameDUNCAN JAMES WILLIAMSCredential: DO
Location Address3186 S MARYLAND PKWYLas Vegas, NV 89109-2306
Mailing Address4637 Chabot Dr Ste 104Pleasanton, CA 94588-2749 · (925) 924-1600
Phone(702) 961-5000
Sole ProprietorYes
Medical School CMSOtherGraduated 2023
Enumeration DateMarch 20, 2023
Last NPPES UpdateJuly 16, 20263 updates tracked since enumeration
NPPES CertifiedJuly 16, 2026
✔ NPI 1225730781 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyEmergency MedicineAllopathic & Osteopathic Physicians
Taxonomy Code207P00000X
Licenses✔ Licensed in NV · DO4122✔ Licensed in AZ · 012254
Definition
An emergency physician focuses on the immediate decision making and action necessary to prevent death or any further disability both in the pre-hospital setting by directing emergency medical technicians and in the emergency department. The emergency physician provides immediate recognition, evaluation, care, stabilization and disposition of a generally diversified population of adult and pediatric patients in response to acute illness and injury.
3186 S MARYLAND PKWY, Las Vegas, NV 89109
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Medicare Participation & PECOS CMS

Medicare enrollment, assignment, and ordering and referring status from the CMS PECOS system.

Medicare Enrollment Status

✔

Enrolled in Medicare (PECOS)

Duncan James Williams Do is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).

PECOS PAC ID3274989934
PECOS Enrollment IDI20260515002953
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.

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 89109 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
$88.51 typical visit price
range $57.07 – $173.24
Typical copayment $22.12 (range $14.26 – $43.31)
Most-billed visit code 99203
Established Patient
$100.60 typical visit price
range $18.27 – $140.96
Typical copayment $25.15 (range $4.56 – $35.24)
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.

Other Providers at the Same Location NPPES 20

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

RADIOLOGY SPECIALISTS, LTD.
Radiology (Vascular & Interventional Radiology)
3186 S MARYLAND PKWY
LAS VEGAS, NV 89109
Clark County (703) 961-5000
KAITLYN NICOLE WALDEN MD
Pediatrics
3186 S MARYLAND PKWY
LAS VEGAS, NV 89109
Clark County (702) 961-5437
ARASH ALBEKORD M.D.
Emergency Medicine
3186 S MARYLAND PKWY
LAS VEGAS, NV 89109
Clark County (702) 731-8000
JAMES CLAY LEE PHYSICIAN ASSISTANT
Physician Assistant
3186 S MARYLAND PKWY
LAS VEGAS, NV 89109
Clark County (702) 961-5000
JEMAL A BUSSE
Nurse Practitioner (Psychiatric/Mental Health)
3186 S MARYLAND PKWY
LAS VEGAS, NV 89109
Clark County (702) 415-3787
DR. BALAJI RAMASAMY M.D
Internal Medicine
3186 S MARYLAND PKWY
LAS VEGAS, NV 89109
Clark County (702) 731-8211
MARK H STEINHAUER, MD PC
Physical Medicine & Rehabilitation
3186 S MARYLAND PKWY
LAS VEGAS, NV 89109
Clark County (702) 731-8000
DR. ROYA LAURA MAHANA D.O.
Emergency Medicine
3186 S MARYLAND PKWY
LAS VEGAS, NV 89109
Clark County (702) 961-5000

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 Duncan Williams's NPI number?

The NPI number for Duncan Williams is 1225730781. It was assigned to this individual provider in the NPPES registry on March 20, 2023.

Where is Duncan Williams located?

Duncan Williams practices at 3186 S Maryland Pkwy, Las Vegas, NV 89109. The listed phone number is (702) 961-5000.

What is Duncan Williams's specialty?

The primary specialty registered for this NPI is Emergency Medicine with taxonomy code 207P00000X.

Is Duncan Williams enrolled in Medicare?

Yes. Duncan Williams is registered in the Medicare PECOS enrollment system.

When was this NPI record last updated?

The NPPES record for Duncan Williams was last updated on July 16, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 22 days 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.