John Gilliam, MD
NPI 1992780126 · Gastroenterology Physician · Winston Salem, NC
Enrolled with Medicare as Practitioner - Gastroenterology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
John Gilliam, MD is a Gastroenterology Physician provider in Winston Salem, NC (NPI 1992780126).
Provider details
- NPI number
- 1992780126
- Entity type
- Individual
- Primary specialty
- Gastroenterology PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- No
- License
- 22918 (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
20 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
73 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) |
|---|---|---|
| Established Patient Office Or Other Outpatient Visit With Low Level OD Decision Making, If Using Time, 20 Minutes Or More99213 | 46 | $61 |
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 16 | $91 |
| Biopsy of Esophagus, Stomach, And/Or Upper Small Bowel Using a Flexible Endoscope43239 | 11 | $72 |
Typical Medicare-allowed amounts for these services range $61–$91 (2024). The Medicare-allowed amount is what Medicare recognizes for a service under fee-for-service — a reference figure for 2024, not a price quote and not what you would be billed. Medicare Part B covers roughly an eighth of all NPIs (65+ skew); services with fewer than 11 beneficiaries are suppressed by CMS. Source: CMS Medicare Physician & Other Practitioners, by Provider & Service.
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 13 distinct drugs on file.
| Drug | Part D claims (2024) |
|---|---|
| Alprazolam | 25 |
| Omeprazole | 25 |
| Mesalamine | 19 |
| Prednisone | 19 |
| Pantoprazole Sodium | 16 |
| Ondansetronbrand: Ondansetron Odt | 15 |
| Azathioprine | 15 |
| Cholestyramine (with Sugar)brand: Cholestyramine | 15 |
| Dicyclomine Hcl | 13 |
| Rifaximin |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$242 across 10 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
- 2005-12-09
- Last updated
- 2008-05-08
Frequently asked questions
- What is John Gilliam's NPI number?
- John Gilliam's National Provider Identifier (NPI) is 1992780126, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is John Gilliam's specialty?
- John Gilliam is listed in the NPPES registry with a primary specialty of Gastroenterology Physician (Allopathic & Osteopathic Physicians).
- Where is John Gilliam located?
- John Gilliam's practice location on file with NPPES is Medical Center Blvd, Winston Salem, NC 27157-0001.
- What is John Gilliam's phone number?
- The practice phone number listed in the NPPES registry for John Gilliam is (336) 716-2255.
- Does John Gilliam accept Medicare?
- John Gilliam is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is John Gilliam's NPI active?
- Yes — John Gilliam's NPI (1992780126) is active in the NPPES registry as of the last update on 2008-05-08.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.