William Gallahan, M.D.
NPI 1508040213 · Internal Medicine Physician · Winston Salem, NC
Enrolled with Medicare as Practitioner - Gastroenterology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
William Gallahan, M.D. is a Internal Medicine Physician provider in Winston Salem, NC (NPI 1508040213).
Provider details
- NPI number
- 1508040213
- Entity type
- Individual
- Primary specialty
- Internal Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- No
- License
- 2010-00678 (NC)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure25% of score
18 yrs in NPPES registry
- Profile completeness25% of score
100% of core fields populated
- Practice footprint15% of score
1 documented practice location
- Medicare service volume (vs. specialty peers)25% of score
1,318 Medicare services, 2024 (ranked within specialty)
- Open Payments transparency10% of score
Has Open Payments disclosures (2024)
Medicare volume is ranked against active providers in the same specialty. Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our .
What this provider does (Medicare)
Based on Medicare fee-for-service claims, 2024; not all care is captured.
| Service (HCPCS) | Medicare services | Typical Medicare-allowed (2024) |
|---|---|---|
| Removal of Polyps Or Growths of Large Bowel Using an Endoscope With Mechanical Snare45385 | 261 | $255 |
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 162 | $131 |
| Biopsy of Esophagus, Stomach, And/Or Upper Small Bowel Using a Flexible Endoscope43239 | 153 | $92 |
| Established Patient Office Or Other Outpatient Visit With Low Level OD Decision Making, If Using Time, 20 Minutes Or More99213 | 145 | $93 |
| Biopsy of Large Bowel Using a Flexible Endoscope45380 | 133 | $123 |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 22 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Pantoprazole Sodium | 248 | 78 |
| Peg3350/Sod Sulf,bicarb,cl/Kclbrand: Gavilyte-G | 241 | 234 |
| Peg3350/Sod Sulf,bicarb,cl/Kclbrand: Peg-3350 and Electrolytes | 86 | 83 |
| Sod Picosulf/Mag Ox/Citric Acbrand: Clenpiq | 82 | 82 |
| Linaclotidebrand: Linzess | 77 | 24 |
| Omeprazole | 76 | 24 |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$1,840 across 102 records (Open Payments 2024)
Open Payments discloses payments and transfers of value (meals, travel, consulting, research, royalties) from drug and device makers to providers. This is a transparency signal, not a verdict — such payments are legal and common, and their presence is neither an endorsement nor a criticism. Source: CMS Open Payments, program year 2024.
Practice location
Mailing address
Registry dates
- Enumerated
- 2007-12-18
- Last updated
- 2010-05-05
Frequently asked questions
- What is William Gallahan's NPI number?
- William Gallahan's National Provider Identifier (NPI) is 1508040213, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is William Gallahan's specialty?
- William Gallahan is listed in the NPPES registry with a primary specialty of Internal Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is William Gallahan located?
- William Gallahan's practice location on file with NPPES is Wake Forest University Health Sciences, Winston Salem, NC 27157-0001.
- What is William Gallahan's phone number?
- The practice phone number listed in the NPPES registry for William Gallahan is (336) 716-2255.
- Does William Gallahan accept Medicare?
- William Gallahan is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is William Gallahan's NPI active?
- Yes — William Gallahan's NPI (1508040213) is active in the NPPES registry as of the last update on 2010-05-05.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.