PROVIDER PROFILE · NPI 1003898131
Mark JohnstonMD
CROSS-REFERENCE
Directional shared-patient flow from Medicare claims — who sends patients to this provider (inbound) and where this provider's patients go next (outbound). 20 inbound referrers · 57 outbound destinations.
| Physician | Patients | Visits |
|---|---|---|
| LANCASTER GENERAL HOSPITAL | 173 | 706 |
| ROSE CITY HMA LLC | 31 | 79 |
| Lancaster Emergency Medical Services Association Ambulance Service Provider · Millersville, PA | 28 | 45 |
| Melissa Mckernan Pulliam Clinical Cardiac Electrophysiology · Lancaster, PA | 22 | 43 |
| Robert Martin Nurse Practitioner · Lancaster, PA | 22 | 53 |
| Patrick Weybright Diagnostic Radiology · Lancaster, PA | 21 | 40 |
| John Briguglio Diagnostic Radiology · Hershey, PA | 21 | 36 |
| Quest Diagnostics Clinical Laboratories Inc Clinical Laboratory · Norristown, PA | 19 | 254 |
| Paul Allegretti Gastroenterology · Lancaster, PA | 18 | 56 |
| Jeffrey Kramer Diagnostic Radiology · Allentown, PA | 17 | 31 |
| John Horwhat Gastroenterology · Lancaster, PA | 13 | 27 |
| Tareck Nossuli Advanced Heart Failure and Transplant Cardiology · Lancaster, PA | 13 | 33 |
| Physician | Patients | Visits |
|---|---|---|
| LANCASTER GENERAL HOSPITAL | 191 | 829 |
| LANCASTER PA ENDOSCOPY ASC LLC | 105 | 129 |
| Fabien Baksh Pathology · Lancaster, PA | 86 | 99 |
| Dennis Horn Certified Registered Nurse Anesthetist (CRNA) · York, PA | 49 | 65 |
| ROSE CITY HMA LLC | 48 | 161 |
| Heather Saunders Certified Registered Nurse Anesthetist (CRNA) · Lancaster, PA | 36 | 41 |
| John Modene Nurse Practitioner · Lancaster, PA | 34 | 63 |
| Robert Martin Nurse Practitioner · Lancaster, PA | 25 | 74 |
| Christopher Farrell Gastroenterology · Lancaster, PA | 25 | 62 |
| Melissa Mckernan Pulliam Clinical Cardiac Electrophysiology · Lancaster, PA | 24 | 50 |
| Peter Eaton Certified Registered Nurse Anesthetist (CRNA) · Lancaster, PA | 24 | 24 |
| Thomas Brooks Diagnostic Radiology · Lancaster, PA | 20 | 28 |