| Abbreviation | Definition |
|---|---|
| BIC | Biceps |
| BID | Brought In Dead |
| BIDS | Bedtime Insulin Daytime Sulphonylurea |
| BIH | Benign Intracranial Hypertension |
| BIL | Bilateral |
| BILI | Bilirubin |
| BIMO | bioresearch monitoring |
| BIMS | Blood In My Stool |
| BIN | Twice A Night |
| BIOP | Biopsy |
| BIPAP | BIlevel Positive Airway Pressure |
| BIS | Bismuth |
| BISSUBCARB | Bismuth Subcarbonate |
| BISSUBGALL | Bismuth Subgallate |
| BISSUBNIT | Bismuth Subnitrate |
| BISSUBSAL | Bismuth Subsalicylate |
| BIT | Bitartrate |
| BITE | Behavior, Intermediary, Target, and Evaluation |
| BIU | Blood In Urine |
| BJ | Bence Jones |