| Johns Hopkins University | Baltimore | 2,909 |
| Kaiser Foundation Health Plan of the Mid Atlantic States, Inc | Largo | 1,899 |
| Suburban/Nrh Medical Rehabilitation Inc | Bethesda | 941 |
| Johns Hopkins Community Physicians, Inc | Laurel | 763 |
| Meritus Medical Center Inc | Hagerstown | 743 |
| Johns Hopkins University | Baltimore | 713 |
| Agape Physical Therapy and Sports Rehabilitation LP | Forest Hill | 678 |
| Centers for Advanced Orthopaedics LLC | Catonsville | 604 |
| Luminis Health Medical Group, LLC | Annapolis | 539 |
| University of Maryland Community Medical Group Inc | Easton | 477 |
| University of Maryland Physicians PA | Baltimore | 404 |
| Tidalhealth Specialty Care LLC | Salisbury | 398 |
| Sinai Hospital of Baltimore, Inc | Baltimore | 380 |
| Anesthesia Company LLC | Prince Frederick | 378 |
| Greater Baltimore Medical Center | Towson | 354 |
| St Paul Place Specialists, Inc. | Baltimore | 336 |
| Amber Hill Physical Therapy Inc | Frederick | 334 |
| First Colonies Anesthesia Associates, LLC | Nottingham | 326 |
| Fox Rehabilitation Services LLC | Lanham | 304 |
| Medstar Heart Institute LLC | Baltimore | 301 |
| Medstar Urgent Care LLC | Wheaton | 300 |
| Union Hospital of Cecil County | Elkton | 288 |
| Privia Care Center LLC | Arnold | 287 |
| University of Maryland St Joseph Medical Group LLC | Towson | 287 |
| Capital Womens Care LLC | Frederick | 281 |
| Brightside Medical PC | Baltimore | 279 |
| Shock Trauma Associates PA | Baltimore | 261 |
| St Agnes Healthcare Inc | Baltimore | 260 |
| Patient First Maryland Medical Group PLLC | Lutherville | 254 |
| Medstar Medical Group - Southern Maryland LLC | Hollywood | 245 |
| Capital Digestive Care LLC | Rockville | 241 |
| Specialists in Medical Imaging SC | Bethesda | 234 |
| Medical Practices of Antietam, LLC | Hagerstown | 234 |
| Dimensions Healthcare Associates, Inc | Cheverly | 199 |
| Frederick Health Medical Group LLC | Brunswick | 199 |
| Advanced Radiology P A | Bel Air | 188 |
| Post Acute Specialists LLC | Elkton | 187 |
| Lifebridge Community Physicians Inc | Owings Mills | 183 |
| Usacs Integrated Acute Care Services of Maryland LLC | Rockville | 179 |
| Chesapeake Urology Associates LLC | Germantown | 177 |
| Comprehensive Primary Care and Associates LLC | Rockville | 171 |
| Progressive Physician Assoc Inc | Chevy Chase | 168 |
| Optum Behavioral Care of North Carolina PC | Mount Airy | 168 |
| Psych Associates of Maryland LLC | Towson | 166 |
| Upmc Western Maryland Health Services LLC | Cumberland | 162 |
| Professional Services of Holy Cross | Silver Spring | 158 |
| Imaging Associates of Michigan PLLC | Forest Hill | 158 |
| Maryland Family Care Inc | Reisterstown | 157 |
| Boston Neurobehavioral Associates, LLC | Crofton | 157 |
| Adventist Physician Services Inc | Silver Spring | 148 |
| University of Maryland Anesthesiology Associates PA | Baltimore | 143 |
| Mnr Industries, LLC | Owings Mills | 139 |
| Bethesda Chevy Chase Orthopaedic Associates, LLC | Bethesda | 134 |
| Maryland Luna Care Physical Therapy LLC | Chevy Chase | 131 |
| Frederick Health Hospital Inc | Brunswick | 127 |
| Anne Arundel Dermatology PA | Glen Burnie | 127 |
| Myeyedr Optometry of Maryland LLC | Hunt Valley | 124 |
| Chase Brexton Health Services Inc | Baltimore | 121 |
| Arundel Mental Health Professionals Lc | Annapolis | 119 |
| Lifebridge Anesthesia Associates LLC | Baltimore | 112 |
| Synergy Medical Group LLC | Hyattsville | 109 |
| Medstar Health Weight Management, LLC | Silver Spring | 104 |
| Maryland Oncology Hematology PA | Columbia | 104 |
| Physician Imaging of Washington Hospital Center LLC | Bel Air | 104 |
| Centers for Advanced ENT Care LLC | Germantown | 103 |
| Maryland Primary Care Physicians, LLC | Columbia | 99 |
| Lhmg Physical Therapy, LLC | Odenton | 96 |
| University of Maryland Surgical Associates PA | Baltimore | 93 |
| Rehab 2 Perform LLC | Mount Airy | 93 |
| Specialty Physicians of Garrett County, LLC | Oakland | 91 |
| Fox Rehab PT MD LLC | Baltimore | 91 |
| Safe Harbor Behavioral Care LLC | Bel Air | 88 |
| Baltimore Medical System, Inc. | Baltimore | 87 |
| Northwest Hospital Center Inc | Randallstown | 87 |
| University of Maryland Diagnostic Imaging Specialists P A | Baltimore | 85 |
| Johns Hopkins Regional Physicians LLC | Lutherville | 84 |
| The Retina Group of Washington PLLC | Silver Spring | 84 |
| Maryland Imaging Network PC | Bethesda | 81 |
| Adfinitas Health at Upper Chesapeake LLC | Bel Air | 78 |
| Advanced Pain Management Specialists LLC | Salisbury | 77 |
| Mountain Radiology Inc | Bethesda | 76 |
| Christiana Care Emergency Physicians LLC | Elkton | 76 |
| Mdics at Bwmc LLC | Glen Burnie | 74 |
| Seton Medical Group Inc | Columbia | 74 |
| Axis Healthcare Group | Silver Spring | 73 |
| Kennedy Krieger Associates | Baltimore | 73 |
| Three Lower Counties Community Services Inc | Salisbury | 72 |
| Medical Rehabilitation Systems LLC | Grantsville | 72 |
| Crh MD Management LLC | Dunkirk | 71 |
| Hospitalist Medicine Physicians of Maryland PC | Frederick | 71 |
| Carroll Health Group LLC | Westminster | 70 |
| Blackwell Physicians, LLC | Rockville | 68 |
| University of Maryland Orthopaedic Associates PA | Baltimore | 67 |
| Sheppard Pratt Physicians PA | Baltimore | 67 |
| Thrive Behavioral Health, LLC | Millersville | 66 |
| Doctor on Demand Professionals P C | Baltimore | 66 |
| Community Radiology Associates Inc | Bethesda | 65 |
| Toller Enterprises, LLC | Baltimore | 64 |
| University of Maryland Oncology Associates PA | Baltimore | 62 |
| Fox Rehab OT MD LLC | Waldorf | 62 |