Gregory George Machiko, MD
NPI 1831191618ActiveIndividual· Internal Medicine, Gastroenterology· Canonsburg, PA
Internal Medicine, Gastroenterology (MD) in Canonsburg, Pennsylvania, trained at Jefferson Medical College of Thomas Jefferson University (class of 1985). Their prescriptions cost Medicare Part D more than their services did: $102,936 for 1,180 claims, against $32,598 paid for services in 2024. Abbvie Inc. was the largest of 9 companies reporting payments in 2025, $1,320 in all, mostly food and beverage.
Overview
| NPI | 1831191618 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | MD |
| Sole proprietor | No |
| NPI issued | Aug 11, 2005 |
| Last updated in NPPES | Nov 18, 2020 |
| Certified by provider | Nov 18, 2020 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine, Gastroenterology Primary | 207RG0100X | MD036665E | PA |
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 (PA) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 187 |
|---|---|
| Services billed | 275 across 30 procedure codes |
| Paid by Medicare | $32,598 |
Part D prescriptions in 2024
| Prescriptions (claims) | 1,180 · 1,699 30-day fills |
|---|---|
| Patients | 470 |
| Total drug cost | $102,936 |
| Generic share | 89% of claims |
Education and affiliations
| Medical school | Jefferson Medical College of Thomas Jefferson University |
|---|---|
| Graduation year | 1985 |
| Medicare specialty | Gastroenterology |
| Telehealth | Offers telehealth |
Medical group
- Allegheny ClinicPittsburgh, PA · 2,389 clinicians
Hospital affiliations
- Canonsburg General HospitalCanonsburg, PA
- Jefferson HospitalJefferson Hills, PA
Industry payments (Open Payments)
- 2025$1,320 · 48 payments from 9 companies
- 2024$994.48 · 39 payments from 8 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Abbvie Inc. | $367.14 | 22 |
| Phathom Pharmaceuticals, Inc. | $208.43 | 5 |
| Genzyme Corporation | $180.25 | 5 |
| Ardelyx, Inc. | $145.06 | 4 |
| Qol Medical, LLC | $138.63 | 3 |
What the 2025 payments were for
- Food and Beverage$1,320 · 48 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
Other Internal Medicine, Gastroenterology providers in Canonsburg
- 1023085719
All Internal Medicine, Gastroenterology providers in Pennsylvania →