| ABEER SIDDIQI, M.D. | Individual | THE WOODLANDS |
| ABILENE ALLERGY PLLC | Organization | ABILENE |
| ABROSMAG MEDICAL CLINIC & REHAB INC | Organization | HOUSTON |
| ACADEMIC ALLERGY ASTHMA & IMMUNOLOGY ASSOCIATES | Organization | HOUSTON |
| ADIL ZAHIRUDDIN, M.D. | Individual | CYPRESS |
| ADOLESCENT & ADULT ALLERGY CENTER, P.A. | Organization | ODESSA |
| ADRIENNE TINANA, MD | Individual | CORPUS CHRISTI |
| ADVANCED ASTHMA & ALLERGY PRACTICE PLLC | Organization | DESOTO |
| ADVANTAGE HEALTH SERVICES | Organization | BULVERDE |
| AKKAMAHADEVI SHRINGERI, M.D. | Individual | ABILENE |
| ALEXANDER ALVAREZ, M.D., P.A. | Organization | AUSTIN |
| ALEXANDER ALVAREZ, M.D. | Individual | AUSTIN |
| ALISHA DIAZ | Individual | SOUTHLAKE |
| ALL ALLERGY ASTHMA & IMMUNOLOGY CLINIC PA | Organization | DALLAS |
| ALLEN LIEBERMAN, MD | Individual | AUSTIN |
| ALLERGY & ASTHMA CARE OF HOUSTON, PA | Organization | SUGAR LAND |
| ALLERGY & ASTHMA CARE OF WYLIE, PLLC | Organization | WYLIE |
| ALLERGY & ASTHMA CENTER AT NORTHPARK | Organization | WAXAHACHIE |
| ALLERGY & ASTHMA CENTER OF DUNCANVILLE PA | Organization | DUNCANVILLE |
| ALLERGY & ASTHMA CENTER OF EL PASO, PA | Organization | EL PASO |
| ALLERGY & ASTHMA CLINIC | Organization | HOUSTON |
| ALLERGY & ASTHMA PHYSICIANS OF ARLINGTON, P.A. | Organization | ARLINGTON |
| ALLERGY & ENT ASSOCIATES PLLC | Organization | HOUSTON |
| ALLERGY & ENT ASSOCIATES, PLLC | Organization | LAKE JACKSON |
| ALLERGY & ENT ASSOCIATES, PLLC | Organization | HOUSTON |
| ALLERGY & ENT ASSOCIATES, PLLC | Organization | LEANDER |
| ALLERGY & ENT ASSOCIATES, PLLC | Organization | THE WOODLANDS |
| ALLERGY & ENT ASSOCIATES, PLLC | Organization | HOUSTON |
| ALLERGY & ENT ASSOCIATES, PLLC | Organization | LAKE JACKSON |
| ALLERGY & ENT ASSOCIATES, PLLC | Organization | HOUSTON |
| ALLERGY & ENT ASSOCIATES, PLLC | Organization | SPRING |
| ALLERGY & ENT ASSOCIATES, PLLC | Organization | MONTGOMERY |
| ALLERGY & ENT ASSOCIATES, PLLC | Organization | KINGWOOD |
| ALLERGY & ENT ASSOCIATES, PLLC | Organization | WEBSTER |
| ALLERGY & ENT ASSOCIATES, PLLC | Organization | BAYTOWN |
| ALLERGY & ENT ASSOCIATES, PLLC | Organization | THE WOODLANDS |
| ALLERGY & ENT ASSOCIATES, PLLC | Organization | RICHMOND |
| ALLERGY & ENT ASSOCIATES, PLLC | Organization | HOUSTON |
| ALLERGY & ENT ASSOCIATES, PLLC | Organization | KATY |
| ALLERGY & ENT ASSOCIATES, PLLC | Organization | CYPRESS |
| ALLERGY & ENT ASSOCIATES, PLLC | Organization | PEARLAND |
| ALLERGY & ENT ASSOCIATES, PLLC | Organization | SUGAR LAND |
| ALLERGY & ENT ASSOCIATES, PLLC | Organization | THE WOODLANDS |
| ALLERGY & ENT ASSOCIATES, PLLC | Organization | HOUSTON |
| ALLERGY & IMMUNOLOGY MEDICAL CENTER LLC | Organization | WEST LAKE HILLS |
| ALLERGY AND ASTHMA CENTER OF DUNCANVILLE, PA | Organization | DUNCANVILLE |
| ALLERGY AND ASTHMA CLINIC OF CENTRAL TEXAS, PA | Organization | ROUND ROCK |
| ALLERGY AND ASTHMA OF PROSPER AND CELINA PLLC | Organization | PROSPER |
| ALLERGY CARE, PLLC | Organization | WICHITA FALLS |
| ALLERGY CENTER, P.A. | Organization | WICHITA FALLS |
| ALLERGY CLINIC PA | Organization | TYLER |
| ALLERGY IMMUNOLOGY AND RESPIRATORY CARE PA | Organization | ALLEN |
| ALLERGY IMMUNOLOGY AND RESPIRATORY CARE PA | Organization | PLANO |
| ALLERGY IMMUNOLOGY AND RESPIRATORY CARE PA | Organization | DALLAS |
| ALLERGY PARTNERS OF TEXAS, INC | Organization | CORPUS CHRISTI |
| ALLERGY PARTNERS OF TEXAS, INC | Organization | TYLER |
| ALLERGY PARTNERS OF TEXAS, INC | Organization | AUSTIN |
| ALLERGY PARTNERS OF TEXAS, INC | Organization | AUSTIN |
| ALLERGY PARTNERS OF TEXAS, INC. | Organization | KERRVILLE |
| ALLERGY PARTNERS OF TEXAS, INC. | Organization | DALLAS |