Dr. William Randolph Mook , MD
Orthopaedic Surgery • Reston, VA
1850 Town Center Pkwy, Ste 400
Reston, VA 201903219
This profile restates public CMS/NPPES data; T-MedInfo gives no medical advice — consult a licensed professional, and call 911 for emergencies.
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Dr. William Mook is listed in NPPES under Orthopaedic Surgery.
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NPI assigned on April 13, 2009; this date does not establish years in practice.
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Published CMS data list 6,628 Original Medicare Part B services in 2024.
Source: CMS, Medicare Physician & Other Practitioners – by Provider and Service, 2024. Published rows only; this is not a quality measure.
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Published Part B service records, 2024:
- J3301 — Injection, triamcinolone acetonide, not otherwise specified, 10 mg: 2,844 service units.
- J7318 — Hyaluronan or derivative, durolane, for intra-articular injection, 1 mg: 1,980 service units.
- 99214 — Established patient outpatient office visit: 410 service units.
Source: CMS, Medicare Physician & Other Practitioners – by Provider and Service, 2024. Units differ by code; these are not visits or a measure of quality.
CPT® only copyright 2023 American Medical Association. All rights reserved. Service names are shortened from CPT Consumer Friendly Descriptors (CMS data, 2024). CPT notice
See all 17 records in the table · Guide: How to read Medicare Part B data
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Published CMS data list 107 Medicare Part D prescriptions, including refills, in 2024.
Source: CMS, Medicare Part D Prescribers – by Provider and Drug, 2024. Published rows only; this is not a quality measure.
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Published Part D records, 2024:
- Diclofenac Sodium — 43 prescription fills, including refills.
- Amoxicillin — 22 prescription fills, including refills.
- Methylprednisolone — 22 prescription fills, including refills.
Source: CMS, Medicare Part D Prescribers – by Provider and Drug, 2024. Drug names come from pharmacy claims. Listing a drug here is not an endorsement or a recommendation.
See all 4 records in the table · Guide: How to read Medicare Part D prescriber data
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More Medicare Part B services than 80% of clinicians listed under Orthopaedic Surgery in Reston, VA (2024, 12 clinicians with data). Median for this group: 2,333. Middle half: 838 to 6,364.
More Medicare Part B services than 85% of clinicians listed under Orthopaedic Surgery in Virginia (2024, 335 clinicians with data). Median for this group: 1,670. Middle half: 429 to 4,403.
Source: CMS, Medicare Physician & Other Practitioners – by Provider and Service, 2024. Billing and prescribing volume is not a quality rating.
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Medicare Part B services went from 2,409 in 2020 to 6,628 in 2024.
Source: CMS, Medicare Physician & Other Practitioners – by Provider and Service, 2020–2024.
Practice Location & Contact Primary Location
1850 Town Center Pkwy
Ste 400
Reston, VA 201903219
Matched by practice address or phone in NPPES. A shared address or phone does not confirm that this clinician works there.
CMS Doctors and Clinicians lists 1 group name: Orthovirginia Inc. See the list
Source: CMS Doctors and Clinicians National Downloadable File, release date unavailable.
Listings do not confirm current availability, employment or a shared ownership network.
Medicare Profile & Education
Source: CMS Doctors and Clinicians National Downloadable File
University Of Virginia School Of Medicine
2009
What Public CMS Data Show
Orthopaedic Surgery: NPPES taxonomy is a reported classification, not proof of board certification.
Medicare patients
551 people with Original Medicare in 2024
It gives a sense of how many people with Medicare this clinician treated that year.
Source: CMS, Medicare Physician & Other Practitioners – by Provider, 2024.
Medicare-allowed amount
About $268,294 in 2024
The total amount Medicare approved for these services in 2024. It includes what Medicare paid and what patients or their other insurance owed, such as the deductible and coinsurance.
It shows the total cost of this clinician's Original Medicare services under Medicare's fee rules.
What this does not show: Medicare-allowed amount
This is not the clinician's income. Part of it can go to a clinic or group practice, staff, equipment or drugs. It is not the price you will pay.
Source: CMS, Medicare Physician & Other Practitioners – by Provider and Service, 2024.
Paid by Medicare
About $202,903 in 2024
The part of the Medicare-allowed amount that Medicare itself paid in 2024, after patients' deductibles and coinsurance.
The gap between the allowed amount and this number is roughly what patients and their other insurance paid.
What this does not show: Paid by Medicare
This is not the clinician's income and not a measure of quality.
Source: CMS, Medicare Physician & Other Practitioners – by Provider and Service, 2024.
30-day fills
109 standardized 30-day fills in 2024
CMS converts prescriptions to 30-day supplies so they can be compared. A 90-day prescription counts as about three 30-day fills.
What this does not show: 30-day fills
It is not a count of patients and not a measure of quality.
Part D drug cost
$876 in 2024
The total cost of these prescriptions in 2024, paid by Medicare drug plans, patients and other payers together.
It shows the total spending on drugs this clinician prescribed, not what any one patient paid.
What this does not show: Part D drug cost
A higher cost often reflects the type of medicines a specialty uses. It is not your out-of-pocket cost and not a measure of quality.
Source: CMS, Medicare Part D Prescribers – by Provider and Drug, 2024.
Open Payments general payments, program year 2025
All general payments: $337.81 across 10 records.
By nature of payment
- Food and Beverage: $244.25 across 7 records.
- Travel and Lodging: $93.56 across 3 records.
Reporting-company totals
- Stryker Corporation: $337.81 across 10 records.
A reported payment does not necessarily mean the financial relationship is improper and is not a measure of care quality. Clinicians can review and dispute these records.
Source: Calculated by T-MedInfo from CMS Open Payments general-payment records for program year 2025 (published June 30, 2026).
Years since graduation
17 years (graduated 2009)
CMS Doctors and Clinicians data list 2009 as the year this clinician finished professional school.
It tells you roughly how long ago the clinician finished school.
What this does not show: Years since graduation
It is not the number of years in practice, and more years does not mean better care.
Source: CMS Doctors and Clinicians National Downloadable File.
NPI first issued
2009
The year this clinician's National Provider Identifier (NPI) was issued. An NPI is a unique 10-digit ID that US health care providers use for billing.
What this does not show: NPI first issued
NPIs have been issued only since 2005, so this year is not necessarily when the clinician started practicing.
Source: CMS NPPES NPI Registry.
Accepts Medicare assignment
CMS data list this clinician as accepting Medicare assignment. This means agreeing to take the Medicare-approved amount as full payment for covered services.
With Original Medicare, you usually pay only your deductible and coinsurance, and the office sends the claim to Medicare for you.
Medicare assignment applies to Original Medicare. It does not tell you whether the clinician is in a Medicare Advantage plan's network, accepts other insurance, or is taking new patients.
Source: CMS Doctors and Clinicians; Medicare.gov, “Does your provider accept Medicare as full payment?”
No telehealth indicator
CMS shows this indicator only when recent Medicare claims include telehealth services. The clinician may still offer telehealth; ask the office.
Source: CMS, Telehealth Indicator on Medicare Care Compare (fact sheet, January 2023); CMS Doctors and Clinicians.
Enrolled in Medicare (PECOS)
Dr. Mook has a Medicare enrollment record in PECOS, the CMS system clinicians use to enroll so they can bill Medicare or order services for people with Medicare.
It does not show whether the clinician accepts assignment, is in your plan's network, or is taking new patients.
Source: CMS Medicare Fee-For-Service Public Provider Enrollment (PECOS); CMS Order and Referring file.
Can order Medicare-covered services
CMS lists Dr. Mook as eligible to order or refer Medicare Part B clinical laboratory and imaging services, durable medical equipment (DME) and home health services for people with Medicare.
Medicare pays for these items and services only when they are ordered by an eligible clinician.
What this does not show: Can order Medicare-covered services
It does not mean the clinician offers these services directly.
Source: CMS Medicare Fee-For-Service Public Provider Enrollment (PECOS); CMS Order and Referring file.
Compared with the same specialty in Reston and Virginia
Billing and prescribing volume is not a quality rating.
Medicare Part B services
More Medicare Part B services than 80% of clinicians listed under Orthopaedic Surgery in Reston, VA (2024, 12 clinicians with data). Median for this group: 2,333. Middle half: 838 to 6,364.
More Medicare Part B services than 85% of clinicians listed under Orthopaedic Surgery in Virginia (2024, 335 clinicians with data). Median for this group: 1,670. Middle half: 429 to 4,403.
Medicare-allowed amount
Close to the middle for clinicians listed under Orthopaedic Surgery in Reston, VA (2024, 12 clinicians with data). Median for this group: $229,064. Middle half: $85,841 to $349,622.
A higher Medicare-allowed amount than 75% of clinicians listed under Orthopaedic Surgery in Virginia (2024, 335 clinicians with data). Median for this group: $131,079. Middle half: $43,486 to $242,097.
Paid by Medicare
Close to the middle for clinicians listed under Orthopaedic Surgery in Reston, VA (2024, 12 clinicians with data). Median for this group: $173,884. Middle half: $64,405 to $265,821.
A higher Medicare payment amount than 75% of clinicians listed under Orthopaedic Surgery in Virginia (2024, 335 clinicians with data). Median for this group: $99,592. Middle half: $32,871 to $184,999.
Medicare Part D prescriptions
Fewer Part D prescriptions than 65% of clinicians listed under Orthopaedic Surgery in Virginia (2024, 329 clinicians with data). Median for this group: 223. Middle half: 74 to 434.
Too few clinicians listed under Orthopaedic Surgery in Reston have Medicare Part D data for 2024 to compare.
Part D drug cost
A lower Part D drug cost than 60% of clinicians listed under Orthopaedic Surgery in Virginia (2024, 329 clinicians with data). Median for this group: $1,521. Middle half: $433 to $3,669.
Too few clinicians listed under Orthopaedic Surgery in Reston have Medicare Part D data for 2024 to compare.
13 active clinicians are listed under Orthopaedic Surgery with a practice address in Reston, VA (586 in Virginia).
Addresses are self-reported to NPPES and may be out of date.
Telehealth indicator in Reston
7.7% of these 13 clinicians have the CMS telehealth indicator.
92.3% of these 13 clinicians are listed by CMS as accepting Medicare assignment.
CMS data by year
Changes may reflect reporting, coverage or privacy limits, not changes in care quality.
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Medicare Part B services
Medicare Part B services increased 175% from 2,409 in 2020 to 6,628 in 2024.
- 2020: 2,409
- 2021: 2,796
- 2022: 3,361
- 2023: 4,338
- 2024: 6,628
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Medicare-allowed amount
Medicare-allowed amount increased 67% from $160,464 in 2020 to $268,294 in 2024.
- 2020: $160,464
- 2021: $176,131
- 2022: $197,613
- 2023: $264,883
- 2024: $268,294
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Paid by Medicare
Paid by Medicare increased 67% from $121,242 in 2020 to $202,903 in 2024.
- 2020: $121,242
- 2021: $135,129
- 2022: $149,182
- 2023: $201,043
- 2024: $202,903
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Medicare Part D prescriptions
Medicare Part D prescriptions increased 149% from 43 in 2020 to 107 in 2024.
- 2020: 43
- 2021: 62
- 2022: 75
- 2023: 50
- 2024: 107
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30-day fills
30-day fills increased 104% from 53 in 2020 to 109 in 2024.
- 2020: 53
- 2021: 78
- 2022: 82
- 2023: 59
- 2024: 109
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Part D drug cost
Part D drug cost decreased 21% from $1,109 in 2020 to $876 in 2024.
- 2020: $1,109
- 2021: $870
- 2022: $951
- 2023: $835
- 2024: $876
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Industry payments (Open Payments)
Industry payments (Open Payments) went from $37.53 in 2021 to $337.81 in 2025.
- 2021: $37.53
- 2022: $1,823.54
- 2023: $1,085.62
- 2024: $318.23
- 2025: $337.81
Sources: CMS Medicare Physician & Other Practitioners (2024), CMS Medicare Part D Prescribers (2024), CMS Open Payments (2025), CMS Doctors and Clinicians, CMS NPPES NPI Registry. Specialty names follow the NUCC Health Care Provider Taxonomy.
Text: T-MedInfo · Report an error.
Pharma & Medical Device Financial Disclosures
Payments and other transfers of value that drug and medical device companies reported to CMS Open Payments
Program year 2025 (payments made January 1 – December 31, 2025): fewer than 11 records totaling $337.81.
| Manufacturer | Payment Nature | Product | Type | Amount ($) |
|---|---|---|---|---|
| Stryker Corporation |
Food and Beverage
In-kind items and services
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BLUEPRINT PATIENT SPECIFIC INSTRUMENTATION | General | $61.76 |
| Stryker Corporation |
Food and Beverage
In-kind items and services
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BLUEPRINT PATIENT SPECIFIC INSTRUMENTATION | General | $47.09 |
| Stryker Corporation |
Food and Beverage
In-kind items and services
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BLUEPRINT PATIENT SPECIFIC INSTRUMENTATION | General | $47.09 |
| Stryker Corporation |
Food and Beverage
In-kind items and services
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BLUEPRINT PATIENT SPECIFIC INSTRUMENTATION | General | $46.04 |
| Stryker Corporation |
Travel and Lodging
Cash or cash equivalent
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BLUEPRINT PATIENT SPECIFIC INSTRUMENTATION | General | $43.06 |
| Stryker Corporation |
Travel and Lodging
Cash or cash equivalent
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BLUEPRINT PATIENT SPECIFIC INSTRUMENTATION | General | $33.45 |
| Stryker Corporation |
Travel and Lodging
Cash or cash equivalent
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BLUEPRINT PATIENT SPECIFIC INSTRUMENTATION | General | $17.05 |
| Stryker Corporation |
Food and Beverage
In-kind items and services
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BLUEPRINT PATIENT SPECIFIC INSTRUMENTATION | General | $16.08 |
| Stryker Corporation |
Food and Beverage
In-kind items and services
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PANGEA | General | $13.73 |
| Stryker Corporation |
Food and Beverage
In-kind items and services
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PANGEA | General | $12.46 |
Source: CMS Open Payments, program year 2025, released June 30, 2026.
Performed Procedures & Service Volume
CPT® is a registered trademark of the American Medical Association. CPT codes, descriptions and other data only are copyright 2016–2023 American Medical Association. All rights reserved. Applicable FARS/HHSARS apply. Descriptions of CPT codes are the AMA's CPT Consumer Friendly Descriptors as published by CMS in the Medicare Physician & Other Practitioners – by Provider and Service data, 2017–2024; they are plain-language summaries, not for clinical coding or documentation. HCPCS Level II codes and descriptions are from CMS. Fee schedules, relative value units, conversion factors and/or related components are not assigned by the AMA, are not part of CPT, and the AMA is not recommending their use. The AMA does not directly or indirectly practice medicine or dispense medical services. The AMA assumes no liability for data contained or not contained herein.
| HCPCS Code | Services | Patients | Submitted Charge | Medicare Allowed |
|---|---|---|---|---|
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J3301
Injection, triamcinolone acetonide, not otherwise specified, 10 mg
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2,844 | 218 | $2.61 | $0.97 |
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J7318
Hyaluronan or derivative, durolane, for intra-articular injection, 1 mg
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1,980 | 19 | $23.00 | $6.54 |
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99214
Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more
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410 | 282 | $275.06 | $140.79 |
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73030
X-ray of shoulder, minimum of 2 views
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357 | 250 | $140.19 | $38.83 |
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20610
Aspiration and/or injection of fluid from large joint
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337 | 227 | $251.32 | $78.73 |
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99213
Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more
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326 | 233 | $176.08 | $100.05 |
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73564
X-ray of knee, 4 or more views
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85 | 73 | $167.41 | $53.80 |
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99204
New patient office or other outpatient visit with moderate level of medical decision making, if using time, 45 minutes or more
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60 | 60 | $312.70 | $184.62 |
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99203
New patient office or other outpatient visit with low level of medical decision making, if using time, 30 minutes or more
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56 | 56 | $228.25 | $123.90 |
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23472
Prosthetic repair of shoulder joint, total shoulder
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39 | 39 | $7008.00 | $1593.07 |
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24301
Relocation of muscle or tendon of upper arm or elbow
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33 | 33 | $3604.00 | $421.08 |
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73562
X-ray of knee, 3 views
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27 | 25 | $125.19 | $40.46 |
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29823
Removal of extensive shoulder joint tissue using an endoscope
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16 | 16 | $2973.00 | $150.52 |
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29826
Shaving of part of shoulder bone and repair of ligament using an endoscope
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15 | 15 | $1674.00 | $184.86 |
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73630
X-ray of foot, minimum of 3 views
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15 | 12 | $113.00 | $39.61 |
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29827
Repair of shoulder rotator cuff using an endoscope
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14 | 14 | $5073.00 | $1128.37 |
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73610
X-ray of ankle, minimum of 3 views
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14 | 12 | $119.14 | $40.92 |
Source: CMS Part B by Provider and Service, 2024; services under 11 beneficiaries omitted by CMS. Privacy limits
Submitted charges are billed amounts, not a price quote for your visit.
Medicare Part D Prescribing Profile & Medications
Medicare Part D prescriptions filled, including refills, in 2024.
| Brand Name | Generic Name | Prescriptions | Day Supply | Total Cost | Patients |
|---|---|---|---|---|---|
| Diclofenac Sodium | Diclofenac Sodium | 43 | 1,350 | $378.10 | 23 |
| Amoxicillin | Amoxicillin | 22 | 56 | $56.96 | 19 |
| Methylprednisolone | Methylprednisolone | 22 | 132 | $120.41 | 19 |
| Celecoxib | Celecoxib | 20 | 420 | $320.63 | 12 |
Source: CMS Part D by Provider and Drug, 2024; rows below 11 claims omitted by CMS; volume isn’t quality. Privacy limits
Specialties & License Numbers Reported to NPPES
Self-certified to NPPES: 2020-10-28NUCC Taxonomy Code: 207X00000X
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.
NUCC Taxonomy Code: 207XX0005X
An orthopaedic surgeon trained in sports medicine provides appropriate care for all structures of the musculoskeletal system directly affected by participation in sporting activity. This specialist is proficient in areas including conditioning, training and fitness, athletic performance and the impact of dietary supplements, pharmaceuticals, and nutrition on performance and health, coordination of care within the team setting utilizing other health care professionals, field evaluation and management, soft tissue biomechanics and injury healing and repair. Knowledge and understanding of the principles and techniques of rehabilitation, athletic equipment and orthotic devices enables the specialist to prevent and manage athletic injuries.
Medicare (PECOS) Enrollment & Ordering Eligibility
Source: CMS PECOSPRACTITIONER - ORTHOPEDIC SURGERY
I20170130001225
VA
5193030625
Sources: CMS Provider Enrollment and Order and Referring. Medicare enrollment is a billing status, not an accreditation or quality rating.
Medicare Group Practice Enrollments
Source: CMS Doctors and Clinicians National Downloadable File
Orthovirginia Inc
1850 Town Ctr Pkwy, Reston, VA 201903300
Phone: 7038105202
Clinicians Sharing This Practice Address or Phone
Clinicians sharing this NPPES address, phone or fax; a shared contact does not mean they work together.
Orthopaedic Surgery - Adult Reconstructive Orthopaedic Surgery
Doctor of Medicine (M.D.)
Physician Assistant
Physician Assistant (Certified)
Physician Assistant
Physician Assistant (Certified)
Physician Assistant
Physician Assistant
Physician Assistant
Physician Assistant (Certified)
Physician Assistant
Physician Assistant
Career & Practice History
NPI enumerated April 13, 2009.
No changes to the name, practice address, taxonomy or NPI status in this record have been observed in the monthly NPPES data files from January 2017 to August 2026.
NPI Administrative Meta
Other Orthopaedic Surgery Specialists in Reston
- Dr. George Kartalian, Jr., MD
- Dr. Paul Switaj, MD
- Dr. James Reeves, MD
- Dr. Aaron Carter, MD
- Korey Yngstrom
- Dr. Charles Seal, MD
Mailing Address
Po Box 75420
Baltimore, MD 212755420
Phone: 7033836469