William Colin Gallahan, M.D.
Internal Medicine Physician · Winston Salem, NC
William Colin Gallahan, M.D. is an internal medicine physician with a practice address in Winston Salem, North Carolina, and NPI 1508040213, issued on Dec 18, 2007. Check the license (North Carolina 2010-00678, as entered in NPPES) on the North Carolina Medical Board; the Medicare figures below come from public CMS files.
- Name
- William Colin Gallahan
- Credential
- M.D.
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- 2010-00678 NC
Self-reported in NPPES; status is on the state search - Practice location
- Wake Forest University Health Sciences, Winston Salem, NC 27157
- Phone
- (336) 716-2255
- Enumerated
- Dec 18, 2007
- Record last updated
- May 5, 2010 (not updated in 16 years: call before relying on the address or phone)
- Medicare enrollment
- Enrolled (PECOS I20110616000644); accepts Medicare assignment
- Medical or professional school
- University Of Virginia School Of Medicine, 2004
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 4,056 in North Carolina → Look up another NPI →
Also registered at Wake Forest University Health Sciences
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify William Colin Gallahan in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersNorth Carolina Medical Board
Search for license 2010-00678Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
56% fewer Medicare Part D claims than the average internal medicine physician in 2024
1,403 Medicare Part D claims for 643 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. Brand-name drugs were 28% of claims.
Most prescribed
- Pantoprazole Sodium248 claims
- Gavilyte-G241 claims
- Peg-3350 And Electrolytes86 claims
- Clenpiq82 claims
- Linzess77 claims
- Omeprazole76 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 practice group's MIPS final score for 2023 (Medicare payment program): 83.2 of 100
The Merit-based Incentive Payment System score is reported for the practice group, not for one clinician alone. 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, group reporting; category weights for 2023 (qpp.cms.gov).
Industry payments in 2024: $1,839.98
102 payments; by number, the most common kind was food and beverage; the largest payer was Abbvie Inc. The 50,334 providers of this specialty with any payment received $1,303.06 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
- Richmond Gastroenterology Associates, Inc.North Chesterfield, VA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
William Colin Gallahan among 4,056 internal medicine physician records in North Carolina
William Colin Gallahan, M.D. is one of 4,056 internal medicine physician records with a practice address in North Carolina. 82% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2007, is newer than 48% of them.
- NPI issued2007 · 48% of these records are older, 43% newer
- In a Medicare fileYes · 82% of these records are
- In the CMS Doctors and Clinicians fileYes · 67% of these records are
- Graduated2004 · median 2004 among the 2,706 with a school on file
- Record last updated2010 · 48% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207R00000X and a North Carolina practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
218 internal medicine physician records list a practice address in Winston Salem
They are 218 of the 10,040 NPPES records with a practice address in Winston Salem, and 4,056 internal medicine physician records in North Carolina.
All 4,056 in North Carolina → Every provider in Winston Salem → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- Megan Alexander, MDWinston Salem, NC 271571467438739
- William Applegate, MDWinston Salem, NC 271571730163197
- Alain Bertoni, MDWinston Salem, NC 271571558344259
- Thomas Dubose, MDWinston Salem, NC 271571164405874
- Kirsten Feiereisel, MDWinston Salem, NC 271571669468724
- Elizabeth Gamble, MDWinston Salem, NC 271571356326391
- David Goff, MDWinston Salem, NC 271571144203845
- Peter Hoffmann, MDWinston Salem, NC 271571063495760
Common questions
What is William Colin Gallahan, M.D.'s NPI number?
William Colin Gallahan, M.D.'s National Provider Identifier (NPI) is 1508040213, issued on Dec 18, 2007. An NPI identifies a provider in billing; it is not a license.
Where is William Colin Gallahan, M.D. located?
The NPPES record lists a practice address at Wake Forest University Health Sciences, Winston Salem, NC, 27157. Phone: (336) 716-2255. Providers update this record themselves, so call before visiting.
How can I verify William Colin Gallahan, M.D.'s license?
NPPES lists North Carolina license number 2010-00678, as entered by the provider. Search the North Carolina Medical Board at https://portal.ncmedboard.org/verification/search.aspx. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does William Colin Gallahan, M.D. prescribe under Medicare Part D?
In 2024, William Colin Gallahan, M.D. had 1,403 Medicare Part D claims for 643 beneficiaries; the average among internal medicine physician prescribers was 3,176. Part D covers Medicare prescriptions only.
What is William Colin Gallahan, M.D.'s MIPS final score?
The 2023 MIPS final score is 83.2 of 100, reported for the practice group. 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.