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- Obesity 133 total
- Obsessive-Compulsive Disorder 1 total
- Occlusions 16 total
- Ocular Hypertension 19 total
- Open Heart Surgery 0 total
- Opioid Use Disorder 9 total
- Oppositional Defiant Disorder (ODD) 0 total
- Oral Cancer 3 total
- Oral Candidiasis 1 total
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- Oral Facial Pain 2 total
- Oral Medicine 0 total
- Organ Transplant 17 total
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- Orthopedic Surgery 34 total
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- Orthostatic Hypotension 2 total
- Osteoarthritis 49 total
- Osteomyelitis 2 total
- Osteopenia 6 total
- Osteoporosis 8 total
- Osteosarcoma 5 total
- Otitis (Pediatric) 0 total
- Otitis Externa (Swimmer's Ear) 0 total
- Otitis Media 1 total
- Ovarian Cancer 31 total
- Ovarian Cysts 3 total
- Ovarian Function 1 total
- Ovulation 6 total
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