| ADR | Ain't Doing Right | - | NASA |
| AE | Aggressive Euthanasia - A Procedure That Obnoxious Patients Would Benefit From. | - | NASA |
| AFUBR | All Fucked Up & Beyond Repair | - | NASA |
| AGA | Acute Gravity Attack (fell Over) | - | NASA |
| AGMI | Ain't Gonna Make It (won't Survive) | - | NASA |
| AHF | Acute Hissy Fit | - | NASA |
| ALC | A La Casa (send The Patient Home) | - | NASA |
| ALP | Acute Lead Poisoning - Gunshot Wound | - | NASA |
| ALP185 | Acute Lead Poisoning, 185 Grain Injection - 9mm Gunshot Wound | - | NASA |
| ALP240 | Acute Lead Poisoning, 240 Grain Injection 44 Calibre Magnum Wound | - | NASA |
| ALPAC | Acute Lead Poisoning Air-conditioned - Multiple Gun Shot Wounds | - | NASA |
| ALS | Absolute Loss Of Sanity (nutcase) | - | NASA |
| AMYOYO | Alright Motherfucker, You're On Your Own (seen In Head Injury Patients In Intensive Care) | - | NASA |
| AOB | Alcohol On Board | - | NASA |
| APD | Acute Prozac Deficiency (depression) | - | NASA |
| APRS | (US) Acute Puerto Rican Syndrome (bouts Of Screaming And Yelling) | - | NASA |
| APTFRAN | Apply Pillow To Face, Repeat As Necessary (for Annoying Patient) | - | NASA |
| AQP | Assuming The Q Position: Deteriorating Or Dying With Tongue Hanging Out | - | NASA |
| AQR | Ain't Quite Right | - | NASA |
| ART | Approaching Room Temperature (dead) | - | NASA |
| AST | Assuming Seasonal Temperature (dead) | - | NASA |
| ATD | (US) Acute Tylenol Deficiency (simple Fever Or Head Cold) | - | NASA |
| ATFO | Asked To Fuck Off | - | NASA |
| ATL | (Scotland) Aff (off) The Legs; Meaning Unable To Walk | - | NASA |
| ATS | Acute Thespian Syndrome: Faking Illness; Known In US As MGM Syndrome | - | NASA |
| AWTB | Away With The Birds; A Patient Who Is Totally Confused | - | NASA |
| AWTF | Away With The Fairies; A Patient Who Is Totally Confused | - | NASA |
