Active NPI 1124092309 Individual Practitioner Male Practitioner

Dr. William L. Simpson , MD

Internal Medicine • Warrenton, VA

Professional Overview & Biography Verified Profile Summary

Dr. William Simpson, MD is a registered healthcare professional specializing in Internal Medicine in Warrenton, VA. Practice services are available at 332 W LEE HWY # 251 under active NPI credentials.

Frequently performed procedures and clinical services include established patient outpatient office visit, insertion of needle into vein for collection of blood sample, annual wellness visit, includes a personalized prevention plan of service (pps), subsequent visit. Full Medicare procedure pricing transparency rates and service volume details are listed on this profile.

Practice Location & Contact Primary Location

Practice Address

332 W Lee Hwy # 251

Warrenton, VA 201862428

Telephone 8333628800

Fax 5403518650

Specialty Benchmarks & Practice Insights

Comparative analytics for Internal Medicine in Warrenton, VA

Active Practitioner

Practitioner Clinical Experience

Active

City Avg: 28.3 Yrs

State Avg: 26.1 Yrs

Regional Practice Density

17 Specialists

Practicing in Warrenton, VA (3758 Statewide)

Telehealth Adoption Rate

35.3% Regional Adoption

In-Person Office Visits Only

Medicare Pricing Discount

51.6% Avg Savings

Under CMS Medicare Fee Schedule vs Standard Submitted Charges

Performed Procedures & Service Volume

Top Medicare Part B procedures performed by this practitioner

CMS Official Data (2018)

Reporting Year:

HCPCS Code & Description	Services	Patients	Submitted Charge	Medicare Allowed
99214 Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more	286	265	$221.00	$106.59
36415 Insertion of needle into vein for collection of blood sample	283	256	$10.00	$2.89
99213 Established patient office or other outpatient visit, typically 15 minutes	243	195	$149.00	$72.01
G0439 Annual wellness visit, includes a personalized prevention plan of service (pps), subsequent visit	116	116	$238.00	$115.56
93000 Routine ekg using at least 12 leads including interpretation and report	103	102	$37.00	$16.79
G0328 Colorectal cancer screening; fecal occult blood test, immunoassay, 1-3 simultaneous	50	50	$25.00	$19.25
96372 Injection beneath the skin or into muscle for therapy, diagnosis, or prevention	45	18	$45.00	$20.44
85610 Blood test, clotting time	31	13	$20.00	$4.75
90471 Administration of 1 vaccine	20	20	$39.00	$19.48
G0009 Administration of pneumococcal vaccine	15	15	$39.00	$18.89
G0008 Administration of influenza virus vaccine	13	13	$39.00	$20.24
90686 Vaccine for influenza for administration into muscle, 0.5 ml dosage	11	11	$38.00	$18.65

HCPCS Code & Description	Services	Patients	Submitted Charge	Medicare Allowed
99214 Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more	815	454	$221.00	$105.92
36415 Insertion of needle into vein for collection of blood sample	796	467	$10.00	$2.91
99213 Established patient office or other outpatient visit, typically 15 minutes	649	407	$149.00	$71.24
93000 Routine ekg using at least 12 leads including interpretation and report	329	319	$37.00	$16.68
G0439 Annual wellness visit, includes a personalized prevention plan of service (pps), subsequent visit	309	309	$238.00	$114.00
G0008 Administration of influenza virus vaccine	207	206	$39.00	$24.99
90686 Vaccine for influenza for administration into muscle, 0.5 ml dosage	203	203	$38.00	$18.65
85610 Blood test, clotting time	119	22	$20.00	$5.28
G0328 Colorectal cancer screening; fecal occult blood test, immunoassay, 1-3 simultaneous	117	117	$25.00	$21.38
96372 Injection beneath the skin or into muscle for therapy, diagnosis, or prevention	114	20	$47.00	$25.14
J3420 Injection, vitamin b-12 cyanocobalamin, up to 1000 mcg	75	15	$14.00	$2.83
G0009 Administration of pneumococcal vaccine	62	62	$39.00	$24.99
90670 Pneumococcal vaccine for injection into muscle	50	50	$308.00	$181.38
90471 Administration of 1 vaccine	39	39	$39.00	$24.51
G0438 Annual wellness visit; includes a personalized prevention plan of service (pps), initial visit	35	35	$350.00	$168.32
99215 Established patient office or other outpatient visit with high level of medical decision making, if using time, 40 minutes or more	33	32	$298.00	$139.02
99202 New patient office or other outpatient visit, typically 20 minutes	31	31	$142.00	$72.28
99211 Office or other outpatient visit for the evaluation and management of established patient that may not require presence of healthcare professional	21	15	$41.00	$19.90
G0402 Initial preventive physical examination; face-to-face visit, services limited to new beneficiary during the first 12 months of medicare enrollment	16	16	$168.00	$153.25
99203 New patient office or other outpatient visit with low level of medical decision making, if using time, 30 minutes or more	14	14	$222.00	$106.74
G0403 Electrocardiogram, routine ecg with 12 leads; performed as a screening for the initial preventive physical examination with interpretation and report	14	14	$37.00	$15.64
90732 Vaccine for pneumococcal polysaccharide for injection beneath the skin or into muscle, patient 2 years or older	13	13	$68.00	$66.64
99212 Established patient office or other outpatient visit with straightforward medical decision making, if using time, 10 minutes or more	11	11	$90.00	$40.95

Medical Specialties & State Licenses

CMS Verified: 2025-07-25

Internal Medicine Primary Specialty

NUCC Taxonomy Code: 207R00000X

State License VA 0101048951

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.

Career & Practice History Timeline

Chronological log of verified NPI updates, location relocations, credentials, and registry changes

10 Historical Events

📍

Updated Practice Location July 25, 2025

Registered at 332 W LEE HWY # 251, WARRENTON, VA 201862428 (Tel: 8333628800)

📍

Updated Business Mailing Address July 25, 2025

Registered at 332 W LEE HWY # 251, WARRENTON, VA 201862428 (Tel: 8333628800)

📍

Updated Practice Location August 30, 2018

Registered at 164 OLD ORCHARD LN, WARRENTON, VA 201862502 (Tel: 5403474783)

📍

Updated Business Mailing Address August 30, 2018

Registered at 164 OLD ORCHARD LN, WARRENTON, VA 201862502 (Tel: 5403474783)

✅

NPI Profile Active January 21, 2015

NPI status registered as active in NPPES database

📍

Updated Practice Location January 21, 2015

Registered at 419 HOLIDAY COURT, SUITE 100, WARRENTON, VA 20186 (Tel: 5403474200)

📍

Updated Business Mailing Address January 21, 2015

Registered at 419 HOLIDAY COURT, SUITE 100, WARRENTON, VA 20186 (Tel: 5403474200)

👤

Provider Name / Credentials Updated January 21, 2015

Recorded as WILLIAM SIMPSON, M.D.

🎓

Medical Taxonomy / Specialty Registered (Primary Specialty) January 21, 2015

Internal Medicine (License #0101048951 in VA)

🟢

Initial NPI Registration & Enumeration February 15, 2006

First registered as active Individual Practitioner in NPPES Database.

Patient & Community Reviews

Verified patient ratings, medical care experiences, and facility photos

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NPI Administrative Meta

NPI Number: 1124092309

Entity Type:

Individual Provider Physician, Nurse Practitioner, or Solo Healthcare Professional (Type 1 NPI)

Enumeration Date: February 15, 2006

Last Update: July 25, 2025

Sole Proprietor: Yes

Update or Correct Profile

Mailing Address

332 W Lee Hwy # 251

Warrenton, VA 201862428

Phone: 8333628800

Public Domain Record This profile contains public domain information published by CMS and NPPES under the Freedom of Information Act (FOIA).

⚠️ Medical Disclaimer

This directory listing is for informational purposes only and does not constitute medical advice, diagnosis, or physician endorsement. If you are experiencing a medical emergency, please call 911 immediately.