- 
            Chronic Liver Disease (SNOMED)
            SNOMED CT
          
- 
            
              
                Automatically-generated equivalent of [Chronic Liver Disease](/codelist/opensafely/chronic-liver-disease/)
               
- 
            Chronic Respiratory Disease
            CTV3
          
- 
            
              
                Codes indicating a diagnosis of a chronic respiratory disease excluding asthma
               
- 
            Chronic Respiratory Disease (SNOMED)
            SNOMED CT
          
- 
            
              
                Automatically-generated equivalent of [Chronic Respiratory Disease](/codelist/opensafely/chronic-respiratory-disease/)
               
- 
            Chronic kidney disease codes - all stages with numeric column
            SNOMED CT
          
- 
            
              
                Adapted from existing PRIMIS CKD codelist - https://www.opencodelists.org/codelist/primis-covid19-vacc-uptake/ckd15/v.1.5.3 -  with additional column for numeric stage for each code.
               
- 
            Chronic obstructive pulmonary disease (COPD) review QoF
            SNOMED CT
          
- 
            
              
                Chronic Obstructive Pulmonary Disease (COPD)  review codes as listed in the QoF business rules
               
- 
            Ciclosporin
            BNF
          
- 
            
            
          
- 
            Ciclosporin - oral
            dm+d
          
- 
            
              
                BNF codelist for oral ciclosporin.
               
- 
            Ciclosporin - oral - dmd
            dm+d
          
- 
            
              
                NHS Dictionary of medicines and devices (dm+d) codelist for ciclosporin
               
- 
            Clarithromycin (oral)
            dm+d
          
- 
            
              
                This codelist contains clarithromycin formulations which may be given orally.
               
- 
            Co-amoxiclav (oral)
            dm+d
          
- 
            
              
                This codelist contains co-amoxiclav formulations which may be given orally.
               
- 
            Codeine for pain
            BNF
          
- 
            
              
                Excludes codeine for cough suppression. Include all codeine-containing products within the BNF Chapters 4.7 and 10.1.1 (combined with NSAIDs).
               
- 
            Combination blood pressure medication
            dm+d
          
- 
            
              
                The following codelist contains products with more than one ingredient for the treatment of blood pressure from the cardiovascular chapter of BNF codes.
               
- 
            Crohn's Disease
            CTV3
          
- 
            
            
          
- 
            Current Asthma
            CTV3
          
- 
            
              
                Codes indicating current, adult asthma.
               
- 
            Current COPD
            CTV3
          
- 
            
              
                Codelist indicating current COPD.