Timothy Scott Mountcastle, MD
Surgery Physician · Ashburn, VA
Timothy Scott Mountcastle, MD is a surgery physician with a practice address in Ashburn, Virginia, and NPI 1821015561, issued on Jul 17, 2006. Check the license (Virginia 0101239935, as entered in NPPES) on the Virginia Department of Health Professions; the Medicare figures below come from public CMS files.
- Name
- Timothy Scott Mountcastle
- Credential
- MD
- Primary taxonomy
- Surgery Physician 208600000X
- License number
- 0101239935 VA
Self-reported in NPPES; status is on the state search - Practice location
- 44095 Pipeline Plaza, Suite 430, Ashburn, VA 20147
- Phone
- (703) 858-3208
- Enumerated
- Jul 17, 2006
- Record last updated
- Dec 13, 2023
- Fax
- (571) 291-2289
- Medicaid ID
- 1821015561 VA
- Medicare enrollment
- Enrolled (PECOS I20061110000291); accepts Medicare assignment
- Medical or professional school
- Howard University College Of Medicine, 1999
- Entity
- Type 1 · individual
8 nearest surgery physician records → All 865 in Virginia → Look up another NPI →
Also registered at 44095 Pipeline Plaza, Suite 430
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Meredith West, PA-CPhysician Assistant1225278260
Verify Timothy Scott Mountcastle in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersVirginia Department of Health Professions
Search for license 0101239935Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
62% fewer Medicare Part D claims than the average surgery physician in 2024
56 Medicare Part D claims for 39 beneficiaries, against an average of 147 among the 20,115 providers of this specialty who prescribed in Part D.
Most prescribed
- Sulfamethoxazole-Trimethoprim16 claims
Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.
The MIPS final score for 2023 (Medicare payment program): 92.6 of 100
The Merit-based Incentive Payment System score is reported for this clinician. Four categories are weighted into the final score; the average among 454,083 clinicians with a measured score was 83.5.
Source: CMS Quality Payment Program, MIPS performance year 2023; category weights for 2023 (qpp.cms.gov).
Industry payments in 2024: $336.93
12 payments; by number, the most common kind was food and beverage; the largest payer was Abbvie Inc. The 17,103 providers of this specialty with any payment received $3,513.80 on average. Payments are reported by manufacturers, not by the provider, and are not a sign of wrongdoing.
Source: CMS Open Payments, program year 2024 (openpaymentsdata.cms.gov); average among providers of this specialty with at least one payment.
Bills Medicare through one group practice
- Loudoun Medical Group, PCAshburn, VA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Timothy Scott Mountcastle among 865 surgery physician records in Virginia
Timothy Scott Mountcastle, MD is one of 865 surgery physician records with a practice address in Virginia. 71% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2006, is newer than 13% of them.
- NPI issued2006 · 13% of these records are older, 56% newer
- In a Medicare fileYes · 71% of these records are
- In the CMS Doctors and Clinicians fileYes · 56% of these records are
- Graduated1999 · median 2004 among the 483 with a school on file
- Record last updated2023 · 45% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 208600000X and a Virginia practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Surgery Physician providers in Virginia
There are 865 surgery physician records in Virginia.
All 865 in Virginia → Every provider in Ashburn → Surgery Physician nationwide →
The 8 surgery physician records with the nearest ZIP codes
- Wesley Harden, M.D.Sterling, VA 201651225015324
- Salini Hota, M.D.Dulles, VA 201661285096818
- Brita Kriss, MDDulles, VA 201661942294558
- James Lesniewski, MDDulles, VA 201661336133941
- Daniel Meikle, M.D.Dulles, VA 201661356662688
- Richard Morris, M.D.Dulles, VA 201661619281292
- Michael Peters, MDDulles, VA 201661629414131
- Nicholas Dugan, MDHaymarket, VA 201691649617101
Common questions
What is Timothy Scott Mountcastle, MD's NPI number?
Timothy Scott Mountcastle, MD's National Provider Identifier (NPI) is 1821015561, issued on Jul 17, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Timothy Scott Mountcastle, MD located?
The NPPES record lists a practice address at 44095 Pipeline Plaza, Suite 430, Ashburn, VA, 20147. Phone: (703) 858-3208. Providers update this record themselves, so call before visiting.
How can I verify Timothy Scott Mountcastle, MD's license?
NPPES lists Virginia license number 0101239935, as entered by the provider. Search the Virginia Department of Health Professions at https://dhp.virginiainteractive.org/lookup/index. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Timothy Scott Mountcastle, MD prescribe under Medicare Part D?
In 2024, Timothy Scott Mountcastle, MD had 56 Medicare Part D claims for 39 beneficiaries; the average among surgery physician prescribers was 147. Part D covers Medicare prescriptions only.
What is Timothy Scott Mountcastle, MD's MIPS final score?
The 2023 MIPS final score is 92.6 of 100. The average among 454,083 clinicians with a measured score was 83.5.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.