| 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 |
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