William D. Lyday II, MD
NPI 1134103195ActiveIndividual· Internal Medicine, Gastroenterology· Roswell, GA
Internal Medicine, Gastroenterology (MD) in Roswell, Georgia, trained at University of North Carolina at Chapel Hill School of Medicine (class of 1995). In 2024 Medicare paid $25,310 for 119 patients, and Part D covered 241 of their prescriptions, 89% of them generic. Phathom Pharmaceuticals, Inc. reported $125.00 in payments in 2025, mostly food and beverage.
Overview
| NPI | 1134103195 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | MD |
| Sole proprietor | Yes |
| NPI issued | Dec 2, 2005 |
| Last updated in NPPES | Sep 26, 2023 |
| Certified by provider | Sep 26, 2023 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine, Gastroenterology Primary | 207RG0100X | 49859 | GA |
Exclusion screening
| List | Result | Details |
|---|---|---|
| HHS-OIG LEIE · Oct 9, 2026 | No match | Checked by NPI and by name + state |
| North Carolina Medicaid · Nov 10, 2026 | No match | — |
| New York OMIG · Nov 10, 2026 | No match | — |
| Ohio Medicaid · Nov 10, 2026 | No match | — |
| Pennsylvania Medicheck · Nov 10, 2026 | No match | — |
| Washington HCA · Nov 10, 2026 | No match | — |
Official OIG search · How matching works ·Bulk check a roster
Medicare
| Enrollment (PECOS) | Enrolled Practitioner - Gastroenterology (GA); Practitioner - Gastroenterology (SC) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 119 |
|---|---|
| Services billed | 283 across 34 procedure codes |
| Paid by Medicare | $25,310 |
Part D prescriptions in 2024
| Prescriptions (claims) | 241 · 358 30-day fills |
|---|---|
| Patients | 83 |
| Total drug cost | $16,422 |
| Generic share | 89% of claims |
Education and affiliations
| Medical school | University of North Carolina at Chapel Hill School of Medicine |
|---|---|
| Graduation year | 1995 |
| Medicare specialty | Gastroenterology |
| Secondary specialties | Internal Medicine |
| Telehealth | Offers telehealth |
Medical groups
- South Georgia Medical Center IncValdosta, GA · 61 clinicians
- Coastal Carolina Multispecialty Associates LLCWalterboro, SC · 49 clinicians
Hospital affiliations
- Northside HospitalAtlanta, GA
- Sgmc HealthValdosta, GA
- Trident Medical CenterCharleston, SC
Industry payments (Open Payments)
- 2025$125.00 · 1 payment from 1 company
- 2024$56.44 · 3 payments from 2 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Phathom Pharmaceuticals, Inc. | $125.00 | 1 |
What the 2025 payments were for
- Food and Beverage$125.00 · 1 payment
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
Other Internal Medicine, Gastroenterology providers in Roswell
- 1437300480
- 1891737532
- 1568546380
- 1285957167
- 1194715946
- 1093869786
- 1841566650
- 1770998577
- 1538350897
- 1760465108
- 1609000793
- 1467447045
All Internal Medicine, Gastroenterology providers in Georgia →