| CHOIR | Canadian Humanitarian Organization for International Relief 
| Others |
| CHOIR | Center for Healthcare Operations Improvement and Research
| Others |
| CHOIR | Center for Healthcare Organization and Implementation Research
| Others |
| CHOIR | Center for Healthcare Organizational and Innovation Research
| Others |
| CHOIR | Collaborative Health Outcomes Information Registry
| Others |
| CHOIR | Correction of Hemoglobin and Outcomes In Renal
| Others |
| CHOIR | Correction of Hemoglobin and Outcomes in Renal Insufficiency (study)
| Others |
| CHOIR | Creating Home Ownership In Regeneration
| Others |