| BELTWAY UROLOGY SERVICES LIMITED PARTNERSHIP | Organization | AUSTIN |
| BLUE RIDGE UROLOGY SERVICES LLC | Organization | AUSTIN |
| BUCKEYE UROLOGICAL SERVICES, LP | Organization | AUSTIN |
| CAROLINA LITHOTRIPSY, A LIMITED PARTNERSHIP | Organization | ROUND ROCK |
| CASCADE LASER SERVICES, LLC | Organization | AUSTIN |
| CASCADE UROLOGICAL SERVICES, LLC | Organization | AUSTIN |
| COLUMBIA UROLOGICAL SERVICES, LLC | Organization | AUSTIN |
| DALLAS LITHOTRIPSY, LP | Organization | AUSTIN |
| DALLAS STONE MANAGEMENT, LP | Organization | IRVING |
| DFW LITHOTRIPSY, LLP | Organization | SAN ANTONIO |
| EAST TEXAS II - ATHENS, LP | Organization | IRVING |
| EAST TEXAS II - LONGVIEW, LP | Organization | IRVING |
| FAYETTEVILLE LITHOTRIPTERS LIMITED PARTNERSHIP- LOUISIANA I | Organization | ROUND ROCK |
| FAYETTEVILLE LITHOTRIPTERS LP - VIRGINIA 1 | Organization | ROUND ROCK |
| FAYETTEVILLE LITHOTRIPTERS, L.P. - AR1 | Organization | AUSTIN |
| FAYETTEVILLE LITHOTRIPTERS, L.P., SOUTH CAROLINA II | Organization | AUSTIN |
| GATEWAY III LITHOTRIPSY, LLC | Organization | IRVING |
| GOLD COAST UROLOGY SERVICES LLC | Organization | AUSTIN |
| GREAT LAKES LASER SERVICES, LP | Organization | WEST LAKE HILLS |
| GREAT LAKES LITHOTRIPSY PARTNERSHIP, LP | Organization | AUSTIN |
| GREATER ALABAMA LITHOTRIPSY, LLC | Organization | AUSTIN |
| GREATER ATLANTA LITHOTRIPSY, LLC | Organization | AUSTIN |
| GULF COAST II LITHOTRIPSY LP | Organization | BAYTOWN |
| GULF SOUTH LITHOTRIPSY, LLC | Organization | AUSTIN |
| HOUSTON LITHOTRIPSY II, LP | Organization | IRVING |
| IRONWOOD II STONE MANAGEMENT, LP | Organization | IRVING |
| KENTUCKY 1 LITHOTRIPSY LLC | Organization | WEST LAKE HILLS |
| LITHOTRIPTERS, INC | Organization | AUSTIN |
| LONGHORN SURGICAL SERVICES, LLC | Organization | SAN ANTONIO |
| LOUISVILLE LITHOTRIPSY LLC | Organization | AUSTIN |
| MEDSTONE INTERNATIONAL, INC. | Organization | AUSTIN |
| METRO HOUSTON LITHOTRIPSY II, LP | Organization | IRVING |
| METRO I STONE MANAGEMENT, LTD | Organization | IRVING |
| METRO LITHOTRIPSY, LLC | Organization | AUSTIN |
| MID-ATLANTIC MOBILE LITHOTRIPSY LLC | Organization | AUSTIN |
| MIDLAND STONE MANAGEMENT, LP | Organization | IRVING |
| MISSISSIPPI LITHOTRIPTERS, LP | Organization | ROUND ROCK |
| MISSISSIPPI VALLEY I STONE MANAGEMENT, LP | Organization | IRVING |
| MOBILE KIDNEY STONE CENTERS OF CA II, LTD | Organization | AUSTIN |
| MOBILE KIDNEY STONE CENTERS OF CA III, LTD | Organization | WEST LAKE HILLS |
| MOBILE KIDNEY STONE CENTERS OF CALIFORNIA, LTD | Organization | AUSTIN |
| MONTANA UROLOGICAL SERVICES, LLC | Organization | AUSTIN |
| NORTH CENTRAL MISSOURI III LITHOTRIPSY, LP | Organization | IRVING |
| NORTH TEXAS STONE MANAGEMENT, LP | Organization | IRVING |
| NORTHERN NEVADA LITHOTRIPSY | Organization | ROUND ROCK |
| PACIFIC MEDICAL OF HAWAII | Organization | AUSTIN |
| PRIME KIDNEY STONE TREATMENT, INC | Organization | AUSTIN |
| RED RIVER UROLOGICAL SERVICES, LP | Organization | AUSTIN |
| RESTON LITHOTRIPSY LIMITED PARTNERSHIP | Organization | AUSTIN |
| RIO GRANDE LITHOTRIPSY, LP | Organization | IRVING |
| ROCKY MOUNTAIN LASER, L.P. | Organization | AUSTIN |
| SACRAMENTO ESL SERVICES, LLC | Organization | AUSTIN |
| SAN DIEGO LITHOTRIPTERS LP I | Organization | AUSTIN |
| SAN DIEGO UROLOGY SERVICES LLC | Organization | AUSTIN |
| SE COLORADO LITHOTRIPSY II, LP | Organization | IRVING |
| SI LITHOTRIPSY LLC | Organization | AUSTIN |
| SOUTH ORANGE COUNTY LITHOTRIPTERS, LLC | Organization | AUSTIN |
| SOUTH TEXAS LITHOTRIPSY, LP | Organization | IRVING |
| SUN MEDICAL TECHNOLOGIES, INC | Organization | ROUND ROCK |
| SUN MEDICAL TECHNOLOGIES, INC. | Organization | ROUND ROCK |