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WILLIAM L. SIMPSON M.D.
NPI 1124092309
Internal Medicine in Warrenton, VA

Active since February 15, 2006Opted out of Medicare · through Jul 1, 2028
332 W LEE HWY # 251, WARRENTON, VA 20186(833) 362-8800(540) 351-8650 Get Directions Write a Review

NPPES record last updated: July 25, 2025. Verified against the NPPES registry weekly; last sync: September 27, 2026.

About William L. Simpson M.d. NPPES

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

WILLIAM L. SIMPSON M.D. (NPI 1124092309) is an individual internal medicine provider in Warrenton, Virginia, licensed in Virginia (0101048951) and active in the NPI registry since February 2006. He has opted out of Medicare through July 1, 2028 and remains eligible to order and refer.

NPPES Registry Identity

NPI1124092309
Entity TypeIndividualMale
Primary Taxonomy207R00000X
Provider Legal NameWILLIAM L. SIMPSONCredential: M.D.
Location Address332 W LEE HWY # 251Warrenton, VA 20186-2428
Mailing Address332 W Lee Hwy # 251Warrenton, VA 20186-2428 · (833) 362-8800 · Fax (540) 351-8650
Phone(833) 362-8800
Fax(540) 351-8650
Sole ProprietorYes
Enumeration DateFebruary 15, 2006
Last NPPES UpdateJuly 25, 2025
NPPES CertifiedJuly 25, 2025
✔ NPI 1124092309 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyInternal MedicineAllopathic & Osteopathic Physicians
Taxonomy Code207R00000X
License✔ Licensed in VA · 0101048951
Definition
A physician who provides long-term, comprehensive care in the office and the hospital, managing both common and complex illness of adolescents, adults and the elderly. Internists are trained in the diagnosis and treatment of cancer, infections and diseases affecting the heart, blood, kidneys, joints and digestive, respiratory and vascular systems. They are also trained in the essentials of primary care internal medicine, which incorporates an understanding of disease prevention, wellness, substance abuse, mental health and effective treatment of common problems of the eyes, ears, skin, nervous system and reproductive organs.
332 W LEE HWY # 251, Warrenton, VA 20186
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Accepted Insurance

The full list of accepted plans is on the Insurance tab. Issuers include Molina Healthcare.Insurance ›

Medicare Participation & PECOS CMS

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

Medicare Enrollment Status

ⓘ

Opted out of Medicare

William L. Simpson M.d. has filed a Medicare opt-out affidavit. Services are provided under private contract between the provider and the patient, and are not billed to or reimbursed by Medicare. The opt-out is on file from July 1, 2018 through July 1, 2028.

Opt-Out Effective DateJuly 1, 2018
Opt-Out In Effect ThroughJuly 1, 2028Opt-out affidavits renew automatically every two years unless cancelled
Eligible to Order & Refer✔ Part B Labs & Imaging✔ Durable Medical Equipment✔ Home Health Agency✔ Power Mobility DevicesAn opted-out provider can still order and refer for Medicare patients in the categories marked above, even though their own services are not covered.

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 20186 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
$129.04 typical visit price
range $56.19 – $170.30
Typical copayment $32.26 (range $14.04 – $42.57)
Most-billed visit code 99204
Established Patient
$99.13 typical visit price
range $18.07 – $138.91
Typical copayment $24.78 (range $4.51 – $34.72)
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.

Referred Medical Equipment & Supplies CMS DME claims 2

Durable medical equipment, devices and supplies this provider ordered from DME suppliers for patients, from Medicare fee-for-service claims.

Portable gaseous oxygen system, rental; includes portable container, regulator, flowmeter, humidifier, cannula or mask, and tubing E0431
DME-Oxygen and Supplies · category DC000N
2 suppliers20 claims20 services$11.86 avg. paid by Medicare
Oxygen concentrator, single delivery port, capable of delivering 85 percent or greater oxygen concentration at the prescribed flow rate E1390
DME-Oxygen and Supplies · category DC002N
2 suppliers20 claims20 services$55.67 avg. paid by Medicare
Dollar amounts are the average Medicare paid the supplier per service. They are not the cost to the patient.

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 Simpson's NPI number?

The NPI number for William Simpson is 1124092309. It was assigned to this individual provider in the NPPES registry on February 15, 2006.

Where is William Simpson located?

William Simpson practices at 332 W Lee Hwy # 251, Warrenton, VA 20186. The listed phone number is (833) 362-8800.

What is William Simpson's specialty?

The primary specialty registered for this NPI is Internal Medicine with taxonomy code 207R00000X.

Is William Simpson enrolled in Medicare?

No. William Simpson has opted out of Medicare through July 1, 2028. Care is provided under private contracts, and Medicare does not pay for services furnished by providers who have opted out. The provider remains eligible to order and refer services for Medicare patients.

What insurance does William Simpson accept?

Health plans from Molina Healthcare list William Simpson 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 Simpson was last updated on July 25, 2025. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 14 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.