| Abbreviations | Meaning |
 | ACOEP | American College Of Osteopathic Emergency Physicians |
 | ACOG | American College Of Obstetricians And Gynecologists |
 | ACOHA | American College Of Osteopathic Hospital Administrators |
 | ACOI | American College Of Osteopathic Internists |
 | ACOM | American College Of Occupational Medicine; Anterior Communicating [artery] |
 | ACOMS | American College Of Oral And Maxillofacial Surgeons |
 | ACOOG | American College Of Osteopathic Obstetricians And Gynecologists |
 | ACOP | American College Of Osteopathic Pediatricians; Approved Code Of Practice |
 | ACOS | American College Of Osteopathic Surgeons; Associate Chief Of Staff |
 | ACP | American College Of Physicians |
 | ACP | American College Of Prosthodontists |
 | ACP | Association For Child Psychiatrists |
 | ACP | American College Of Pathologists |
 | ACP | American College Of Pharmacists |
 | ACP | American College Of Psychiatrists |
 | ACP | Association Of Clinical Pathologists |
 | ACP | Association Of Correctional Psychologists |
 | ACPA | American Cleft Palate Association |
 | ACPE | American College Of Physician Executives |
 | ACPM | American College Of Preventive Medicine |
 | ACR | American College Of Radiology |
 | ACR | American College Of Rheumatology |
 | ACR/NEMA | American College Of Radiology/National Electrical Manufacturers' Association [standard For Transferring Radiologic Images] |
 | ACS | American Cancer Society |
 | ACS | American Chemical Society |
 | ACS | American College Of Surgeons |
 | ACS | Association Of Clinical Scientists |
 | ACS CPS | American Cancer Society Cancer Prevention Studies |
 | ACSE | Association Control Service Element |
 | ACSM | American College Of Sports Medicine |
 | ACT | Antichymotrypsin; Anticoagulant Therapy; Anxiety Control Training; Artemisinin Combination Therapy [malaria]; Association Of Cytogenetic Technologists |
 | ACTA | American Cardiology Technologists Association; Automatic Computerized Transverse Axial [scanning] |
 | ACTS | American-Canadian Thrombosis Study; American College Testing Services; Auditory Comprehension Test For Sentences |
 | ACURP | American College Of Utilization Review Physicians |
 | ADA | Adenosine Deaminase; American Dental Association; American Dermatological Association; American Diabetes Association; American Dietetic Association |
 | ADAA | American Dental Assistants Association |
 | ADAPT | Association For Drug And Alcohol Prevention And Treatment |
 | ADDS | American Digestive Disease Society |
 | ADH | Academy Of Dentistry For The Handicapped |
 | ADHA | American Dental Hygienists Association |
 | ADI | Academy Of Dentistry International |
 | ADRDA | Alzheimer Disease And Related Disorders Association |
 | ADTA | American Dental Trade Association |
 | AES | American Endocrine Society |
 | AES | American Endodontic Society |
 | AES | American Epidemiological Society |
 | AES | Acetone-extracted Serum; Ambulatory Encounter System; American Electroencephalographic Society; American Encephalographic Society |
 | AES | American Equilibration Society |
 | AFEDI | Association Francophone Europeene Des Infirmiers [Canada] |
 | AFROC | Association For Freestanding Radiation Oncology Centers |