DR. WILLIAM E KNUDSON JR. DPM
NPI 1083608814
Podiatrist - Foot & Ankle Surgery in Leesburg, VA

Q: What is William Knudson's NPI number?

The NPI number for William Knudson is 1083608814. It was assigned to this individual provider in the NPPES registry on September 8, 2005.

Q: What is William Knudson's specialty?

The primary specialty registered for this NPI is Podiatrist, specializing in Foot & Ankle Surgery, with taxonomy code 213ES0103X.

Q: When was this NPI record last updated?

The NPPES record for William Knudson was last updated on November 1, 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.

Active since September 08, 2005PECOS EnrolledAccepts Medicare Assignment

75/100

CMS Quality Rating

224D CORNWALL ST NW, SUITE 203, LEESBURG, VA 20176(703) 777-5830(703) 777-5155 Get Directions Write a Review

NPPES record last updated: November 1, 2021. Verified against the NPPES registry weekly; last sync: October 18, 2026.

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About Dr. William E Knudson Jr. Dpm NPPES

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

DR. WILLIAM E KNUDSON JR. DPM (NPI 1083608814) is an individual foot & ankle surgery provider in Leesburg, Virginia, licensed in Virginia (0103301049) and active in the NPI registry since September 2005. He is enrolled in Medicare PECOS, is affiliated with Inova Loudoun Hospital, and is a graduate of College Of Podiatric Med And Surgery, Des Moines University (1995).

NPPES Registry Identity

NPI1083608814

Entity TypeIndividualMale

Primary Taxonomy213ES0103X

Provider Legal NameDR. WILLIAM E KNUDSON JR.Credential: DPM

Location Address224D CORNWALL ST NW, SUITE 203Leesburg, VA 20176-2700

Mailing Address224d Cornwall St Nw Ste 102Leesburg, VA 20176-2700 · (703) 777-5830 · Fax (703) 777-5155

Phone(703) 777-5830

Fax(703) 777-5155

Sole ProprietorNo

Medical School CMSCollege Of Podiatric Med And Surgery, Des Moines UniversityGraduated 1995

Enumeration DateSeptember 8, 2005

Last NPPES UpdateNovember 1, 2021

NPPES CertifiedNovember 1, 2021

✔ NPI 1083608814 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyPodiatrist · Foot & Ankle SurgeryPodiatric Medicine & Surgery Service Providers

Taxonomy Code213ES0103X

License✔ Licensed in VA · 0103301049

224D CORNWALL ST NW, Leesburg, VA 20176

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Accepted Insurance

The full list of accepted plans is on the Insurance tab. Issuers include Oscar Health.Insurance ›

Medicare Participation & PECOS CMS

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

Medicare Enrollment Status

✔

Enrolled in Medicare and accepts Medicare assignment

Dr. William E Knudson Jr. Dpm is registered in PECOS and agrees to accept the Medicare-approved amount as full payment. Medicare patients are not billed beyond the standard deductible and coinsurance.

PECOS PAC ID9032134119

PECOS Enrollment IDI20120103000212

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 Knudson reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.

Foot And Ankle Specialists Of The Mid-Atlantic, LLC

234 mi

Podiatrist

3801 WAKE FOREST RD STE 100
Raleigh, NC 27609

Reassigned Medicare billing, Virginia enrollment
66 clinicians in this Medicare group

NPI 1073804712 (301) 933-7133

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

Areas of Expertise CMS Part B claims 17

Services this provider delivered to Medicare fee-for-service patients, from the CMS Medicare utilization data. Higher counts generally reflect more experience with a service; care delivered outside Medicare is not included.

Removal of fingernails or toenails, 6 or more nails 11721

This procedure involves the removal of six or more fingernails or toenails. It's typically done to treat severe nail infections, persistent pain, or abnormal nail growth. Local anesthesia is used to minimize discomfort. Healing usually takes a few weeks.

1,240 services351 patients

Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more 99213

This is a routine visit for patients who have already been seen by the healthcare provider. During this approximately 20-29 minute appointment, your health status will be evaluated and any necessary treatments or tests will be discussed. It's a chance to address any health concerns you may have.

1,022 services463 patients

Removal of noncancer thickened skin growth, 2-4 growths 11056

This procedure involves the safe removal of 2-4 noncancerous thickened skin growths. It's typically done under local anesthesia. The process helps to alleviate discomfort and prevent potential complications. It's a standard, low-risk procedure.

314 services86 patients

X-ray of foot, minimum of 3 views 73630

An X-ray of the foot, minimum of 3 views, is a non-invasive imaging test. It uses a small amount of radiation to produce images of the bones and tissues in your foot. This helps to identify fractures, infections, or other abnormalities. Multiple views ensure a comprehensive examination.

170 services124 patients

New patient office or other outpatient visit with low level of medical decision making, if using time, 30 minutes or more 99203

This service involves an initial office or outpatient visit for a new patient. The healthcare professional will spend 30-44 minutes understanding your health history, current issues, and discussing possible treatment plans. It's a comprehensive evaluation to start your healthcare journey.

170 services170 patients

Removal of noncancer thickened skin growth, 1 growth 11055

This procedure involves the removal of a thickened skin growth that is not cancerous. A healthcare professional will safely extract the growth, usually under local anesthesia. This process helps maintain skin health and prevent potential complications.

136 services44 patients

Injection, triamcinolone acetonide, not otherwise specified, 10 mg J3301

Triamcinolone acetonide is a medication used to reduce inflammation in the body. It's given as a 10 mg injection for conditions like allergies, arthritis, or skin problems. The injection helps to decrease swelling, redness, and itching.

132 services60 patients

Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more 99214

This is a routine check-up for patients who have previously visited our clinic. It involves a comprehensive review of your health and any ongoing treatments. The consultation lasts between 30-39 minutes, allowing enough time to discuss any concerns.

115 services85 patients

Removal of skin and tissue, 20.0 sq cm or less 11042

This procedure involves the surgical removal of skin and tissue, up to 20.0 square cm in size. It's often performed to treat conditions like skin cancer or to remove moles, warts, and other skin lesions. The area is numbed and the unwanted tissue is carefully cut out.

52 services14 patients

Established patient office or other outpatient visit with straightforward medical decision making, if using time, 10 minutes or more 99212

This is a routine check-up for patients who have previously seen the doctor. During this 10-19 minute visit, the doctor will review your health status, discuss any concerns, and manage ongoing treatments or medications. It's a chance to ensure your health is on track.

46 services16 patients

New patient office or other outpatient visit with moderate level of medical decision making, if using time, 45 minutes or more 99204

This is a first-time office or outpatient visit lasting between 45-59 minutes. The healthcare provider evaluates your health, discusses your medical history, and may suggest further tests or treatments. It's an opportunity to ask questions and understand your health better.

31 services31 patients

Aspiration and/or injection of fluid from medium joint 20605

This procedure involves a needle being inserted into a medium-sized joint, such as a knee or shoulder, to remove (aspirate) excess fluid. Sometimes, medication may also be injected into the joint to reduce inflammation and pain.

26 services20 patients

Injection into tendon or ligament 20550

An injection into a tendon or ligament involves placing medication directly into these areas to help reduce inflammation and pain. It's often used for conditions like arthritis or tendonitis. The procedure is quick and usually involves a local anesthetic.

24 services18 patients

Aspiration and/or injection of fluid from small joint 20600

This procedure involves inserting a thin needle into a small joint to remove (aspirate) or inject fluid. It can help diagnose conditions, relieve discomfort, or administer medication directly into the joint. It's generally safe with minimal discomfort.

23 services19 patients

Incision to lengthen toe tendon 28232

This procedure involves a small cut made to the toe tendon, which can help improve its flexibility and function. It's typically performed to correct issues like toe deformities. The process is safe, done under anesthesia, and recovery is relatively quick.

22 services18 patients

X-ray of ankle, minimum of 3 views 73610

An ankle X-ray is a quick, painless imaging test. It involves capturing at least three different images or 'views' of your ankle using small amounts of radiation. These images help identify any abnormalities or injuries, such as fractures or arthritis.

14 services13 patients

Permanent removal fingernail or toenail 11750

Permanent removal of a fingernail or toenail, also known as avulsion, is a procedure performed to treat nail infections or severe ingrown nails. The nail is carefully removed under local anesthesia. After removal, a chemical is applied to prevent nail regrowth, ensuring the issue does not recur.

13 services12 patients

Hospital Affiliations CMS Care Compare

Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.

Inova Loudoun Hospital

Acute Care Hospitals · Leesburg, VA

5/5 CMS rating

OwnershipVoluntary non-profit - Private

CMS Certification Number490043

Location44045 Riverside ParkwayLeesburg, VA 20176 · Loudoun County

Emergency services Birthing friendly

Medicare Quality Performance CMS QPP · MIPS

Performance in the CMS Quality Payment Program: the MIPS final score across four weighted categories, and the individual quality measures reported to Medicare.

75/100

MIPS Final ScoreMerit-based Incentive Payment System · CMS Quality Payment Program

Scored as part of a group practice

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.

ANDREA M PYLE OTR-L

Occupational Therapist

224D CORNWALL ST NW, SUITE 200
LEESBURG, VA 20176

Loudoun County (703) 443-2223

ANN I MA MD

Internal Medicine (Gastroenterology)

224D CORNWALL ST NW, SUITE 207
LEESBURG, VA 20176

Loudoun County (703) 771-9001

DULLES MEDICAL GROUP LLC

Internal Medicine (Geriatric Medicine)

224D CORNWALL ST NW, SUITE 303
LEESBURG, VA 20176

Loudoun County (703) 777-8840

DR. YOUNG DON PARK MD

Internal Medicine (Cardiovascular Disease)

224D CORNWALL ST NW, #306
LEESBURG, VA 20176

Loudoun County (703) 641-9161

SHAHLA WILLIAMS P.T.

Physical Therapist

224D CORNWALL ST NW, SUITE 200
LEESBURG, VA 20176

Loudoun County (703) 443-2223

LOUDOUN MEDICAL GROUP, PC

Orthopaedic Surgery (Adult Reconstructive Orthopaedic Surgery)

224D CORNWALL ST NW, SUITE 204
LEESBURG, VA 20176

Loudoun County (703) 777-3262

MS. ANNE LOWERY LPTA

Physical Therapy Assistant

224D CORNWALL ST NW, SUITE 200
LEESBURG, VA 20176

Loudoun County (703) 443-2223

LOUDOUN MEDICAL GROUP, PC

Surgery (Plastic and Reconstructive Surgery)

224D CORNWALL ST NW, SUITE 304
LEESBURG, VA 20176

Loudoun County (703) 858-3208

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 Knudson's NPI number?

The NPI number for William Knudson is 1083608814. It was assigned to this individual provider in the NPPES registry on September 8, 2005.

Where is William Knudson located?

William Knudson practices at 224D Cornwall St NW Suite 203, Leesburg, VA 20176. The listed phone number is (703) 777-5830.

What is William Knudson's specialty?

The primary specialty registered for this NPI is Podiatrist, specializing in Foot & Ankle Surgery, with taxonomy code 213ES0103X.

Is William Knudson enrolled in Medicare?

Yes. William Knudson is registered in the Medicare PECOS system and accepts Medicare assignment, which means accepting the Medicare-approved amount as payment in full for covered services.

Which organization bills Medicare for William Knudson's services?

According to the CMS Revalidation Reassignment List (October 2026 release), William Knudson reassigns Medicare benefits to Foot And Ankle Specialists Of The Mid-Atlantic, LLC (Raleigh, NC). 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 Knudson's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.

What insurance does William Knudson accept?

Health plans from Oscar Health list William Knudson 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.

Is William Knudson affiliated with any hospitals?

According to CMS data, William Knudson is affiliated with Inova Loudoun Hospital.

When was this NPI record last updated?

The NPPES record for William Knudson was last updated on November 1, 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.