DR. WILLIAM RANDOLPH MOOK M.D.
NPI 1528201134
Orthopaedic Surgery in Reston, VA

Q: What is William Mook's NPI number?

The NPI number for William Mook is 1528201134. It was assigned to this individual provider in the NPPES registry on April 13, 2009.

Q: What is William Mook's specialty?

The primary specialty registered for this NPI is Orthopaedic Surgery with taxonomy code 207X00000X.

Q: When was this NPI record last updated?

The NPPES record for William Mook was last updated on October 28, 2020. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 5 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 April 13, 2009PECOS EnrolledAccepts Medicare Assignment

76.36/100

CMS Quality Rating

1850 TOWN CENTER PKWY, STE 400, RESTON, VA 20190(703) 810-5202(703) 810-5420 Get Directions Write a Review

NPPES record last updated: October 28, 2020. Verified against the NPPES registry weekly; last sync: October 18, 2026.

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About Dr. William Randolph Mook M.d. NPPES

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

DR. WILLIAM RANDOLPH MOOK M.D. (NPI 1528201134) is an individual orthopaedic surgery provider in Reston, Virginia, licensed in Virginia (0101258773) and active in the NPI registry since April 2009. He is enrolled in Medicare PECOS, is affiliated with Winchester Medical Center, and is a graduate of University Of Virginia School Of Medicine (2009).

NPPES Registry Identity

NPI1528201134

Entity TypeIndividualMale

Primary Taxonomy207X00000X

Provider Legal NameDR. WILLIAM RANDOLPH MOOKCredential: M.D.

Location Address1850 TOWN CENTER PKWY, STE 400Reston, VA 20190-3219

Mailing AddressPo Box 75420Baltimore, MD 21275-5420 · (703) 383-6469 · Fax (703) 385-1062

Phone(703) 810-5202

Fax(703) 810-5420

Sole ProprietorNo

Medical School CMSUniversity Of Virginia School Of MedicineGraduated 2009

Enumeration DateApril 13, 2009

Last NPPES UpdateOctober 28, 2020

NPPES CertifiedOctober 28, 2020

✔ NPI 1528201134 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses 2

★ Primary SpecialtyOrthopaedic SurgeryAllopathic & Osteopathic Physicians

Taxonomy Code207X00000X

License✔ Licensed in VA · 0101258773

Definition

An orthopaedic surgeon is trained in the preservation, investigation and restoration of the form and function of the extremities, spine and associated structures by medical, surgical and physical means. An orthopaedic surgeon is involved with the care of patients whose musculoskeletal problems include congenital deformities, trauma, infections, tumors, metabolic disturbances of the musculoskeletal system, deformities, injuries and degenerative diseases of the spine, hands, feet, knee, hip, shoulder and elbow in children and adults. An orthopaedic surgeon is also concerned with primary and secondary muscular problems and the effects of central or peripheral nervous system lesions of the musculoskeletal system.

Also ListedOrthopaedic Surgery · Sports MedicineTaxonomy 207XX0005X · License 53419 (CO)

1850 TOWN CENTER PKWY, Reston, VA 20190

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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 and accepts Medicare assignment

Dr. William Randolph Mook M.d. 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 ID5193030625

PECOS Enrollment IDI20150813009462

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

Orthovirginia, Inc

Same address

Multi-Specialty

1850 TOWN CENTER PKWY, SUITE 303
Reston, VA 20190

Reassigned Medicare billing, District of Columbia and Virginia enrollments
Also billed through NPI 1528781341 (Virginia)
193 clinicians in this Medicare group

NPI 1205185766 (703) 810-5202

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.

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.

2,844 services218 patients

Hyaluronan or derivative, durolane, for intra-articular injection, 1 mg J7318

Hyaluronan or derivative, Durolane, is a treatment injected directly into the joint to relieve pain and improve mobility. It's often used for arthritis in the knee. The substance works by supplementing your body's natural joint fluid to help lubricate and cushion the joint.

1,980 services19 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.

410 services282 patients

X-ray of shoulder, minimum of 2 views 73030

An X-ray of the shoulder, with a minimum of 2 views, is a non-invasive imaging test. It uses a small amount of radiation to produce images of your shoulder bones. This helps in diagnosing conditions like fractures, arthritis, or other abnormalities. The procedure is quick and painless.

357 services250 patients

Aspiration and/or injection of fluid from large joint 20610

This procedure involves using a needle to remove (aspiration) or introduce (injection) fluid into a large joint like the knee or hip. It can help diagnose conditions, relieve discomfort, or deliver medication directly to the joint.

337 services227 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.

326 services233 patients

X-ray of knee, 4 or more views 73564

An X-ray of the knee, 4 or more views, is a non-invasive imaging test. It involves capturing multiple images of your knee from different angles. This helps in diagnosing conditions such as fractures, arthritis, or infections. The procedure is quick and painless.

85 services73 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.

60 services60 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.

56 services56 patients

Prosthetic repair of shoulder joint, total shoulder 23472

Total shoulder prosthetic repair is a surgical procedure to replace a damaged shoulder joint with artificial components. It aims to relieve pain and restore mobility. The procedure involves replacing the ball (humeral head) and socket (glenoid) of the shoulder joint.

39 services39 patients

Relocation of muscle or tendon of upper arm or elbow 24301

Relocation of muscle or tendon in the upper arm or elbow is a surgical procedure designed to improve arm function. It involves moving a muscle or tendon to a new location to enhance movement or correct an issue. This can help with conditions like muscle weakness or injury.

33 services33 patients

X-ray of knee, 3 views 73562

An X-ray of the knee, 3 views, is a non-invasive imaging test. It uses a small amount of radiation to produce images of the knee from three different angles. This helps medical professionals to diagnose and monitor conditions like arthritis, fractures, or infections. The process is quick and painless.

27 services25 patients

Removal of extensive shoulder joint tissue using an endoscope 29823

This procedure, known as arthroscopic debridement, involves using a small camera (endoscope) to view your shoulder joint. Damaged or unwanted tissue is then carefully removed. This minimally invasive technique aims to reduce pain and improve joint mobility.

16 services16 patients

Shaving of part of shoulder bone and repair of ligament using an endoscope 29826

This procedure involves using a tiny camera, called an endoscope, to view and repair a damaged shoulder ligament. Simultaneously, a small portion of the shoulder bone is shaved to alleviate discomfort and improve movement. It's a minimally invasive technique that aids in a quicker recovery.

15 services15 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.

15 services12 patients

Repair of shoulder rotator cuff using an endoscope 29827

This procedure, known as arthroscopic rotator cuff repair, helps fix tears in the shoulder's rotator cuff. An endoscope, a small camera, is used to view the shoulder inside. Using small tools, the surgeon repairs the torn tissue. This minimally invasive approach often leads to a quicker recovery.

14 services14 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 services12 patients

Hospital Affiliations CMS Care Compare 4

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

Winchester Medical Center

Acute Care Hospitals · Winchester, VA

4/5 CMS rating

OwnershipVoluntary non-profit - Private

CMS Certification Number490005

Location1840 Amherst StWinchester, VA 22601 · Winchester City County

Emergency services Birthing friendly

Inova Fair Oaks Hospital

Acute Care Hospitals · Fairfax, VA

5/5 CMS rating

OwnershipVoluntary non-profit - Other

CMS Certification Number490101

Location3600 Joseph Siewick DriveFairfax, VA 22033 · Fairfax County

Birthing friendly

Reston Hospital Center

Acute Care Hospitals · Reston, VA

3/5 CMS rating

OwnershipVoluntary non-profit - Private

CMS Certification Number490107

Location1850 Town Center ParkwayReston, VA 20190 · Fairfax County

Emergency services

Uva Health Haymarket Medical Center

Acute Care Hospitals · Haymarket, VA

3/5 CMS rating

OwnershipVoluntary non-profit - Private

CMS Certification Number490144

Location15225 Healthcote BoulevardHaymarket, VA 20169 · Prince William County

Emergency services

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 20190 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

$100.31 typical visit price

range $65.18 – $194.86

Typical copayment $25.07 (range $16.29 – $48.71)

Most-billed visit code 99203

Established Patient

$80.66 typical visit price

range $21.40 – $158.88

Typical copayment $20.16 (range $5.35 – $39.72)

Most-billed visit code 99213

Amounts reflect what Medicare beneficiaries in this ZIP area are typically charged for office visits. Patients with other coverage should check their individual plans.

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.

76.36/100

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

Scored as part of a group practice

Quality

67.16

Promoting Interoperability

100

Improvement Activities

Cost

54.07

Referred Medical Equipment & Supplies CMS DME claims

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

Shoulder orthosis, acromio/clavicular (canvas and webbing type), prefabricated, off-the-shelf L3670

DME-Orthotic Devices · category DF000N

2 suppliers17 claims17 services$103.79 avg. paid by Medicare

Dollar amounts are the average Medicare paid the supplier per service. They are not the cost to the patient.

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.

MEDSTAR MEDICAL GROUP II LLC

General Practice

1850 TOWN CENTER PKWY
RESTON, VA 20190

Fairfax County (202) 877-7685

DR. DAVID E KARDON MD

Pathology (Anatomic Pathology & Clinical Pathology)

1850 TOWN CENTER PKWY
RESTON, VA 20190

Fairfax County (703) 689-9093

DR. ANDREW HARRIS GORDON M.D., PH.D.

Physical Medicine & Rehabilitation

1850 TOWN CENTER PKWY
RESTON, VA 20190

Fairfax County (703) 949-9660

BERNARD JAMES GAMIAO

Occupational Therapist

1850 TOWN CENTER PKWY
RESTON, VA 20190

Fairfax County (703) 689-9000

SEON H LEE MD

Emergency Medicine

1850 TOWN CENTER PKWY, RESTON HOSPITAL CENTER
RESTON, VA 20190

Fairfax County (703) 689-9037

MRS. DIANE D ZHAO MD

Physical Medicine & Rehabilitation

1850 TOWN CENTER PKWY
RESTON, VA 20190

Fairfax County (703) 689-9000

DR. JAMES L TORRENS MD

Anesthesiology

1850 TOWN CENTER PKWY, RESTON HOSPITAL CENTER
RESTON, VA 20190

Fairfax County (703) 471-0919

JOHN M YOUNG CRNA

Nurse Anesthetist, Certified Registered

1850 TOWN CENTER PKWY
RESTON, VA 20190

Fairfax County (703) 471-0919

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 Mook's NPI number?

The NPI number for William Mook is 1528201134. It was assigned to this individual provider in the NPPES registry on April 13, 2009.

Where is William Mook located?

William Mook practices at 1850 Town Center Pkwy Ste 400, Reston, VA 20190. The listed phone number is (703) 810-5202.

What is William Mook's specialty?

The primary specialty registered for this NPI is Orthopaedic Surgery with taxonomy code 207X00000X.

Is William Mook enrolled in Medicare?

Yes. William Mook 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 Mook's services?

According to the CMS Revalidation Reassignment List (October 2026 release), William Mook reassigns Medicare benefits to Orthovirginia, Inc (Reston, VA). 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 Mook's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.

Is William Mook affiliated with any hospitals?

According to CMS data, William Mook is affiliated with Winchester Medical Center, Inova Fair Oaks Hospital, Reston Hospital Center and Uva Health Haymarket Medical Center.

When was this NPI record last updated?

The NPPES record for William Mook was last updated on October 28, 2020. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 5 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.