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  | Cycle | 
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  | Cyclitis (see also Iridocyclitis) 364.3 | 
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  | Cyclokeratitis - see Keratitis | 
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  | Cyclothymic personality 301.13 | 
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  | Cyesis - see Pregnancy | 
  | Cylindroma (M8200/3) - see also Neoplasm, by site, malignant | 
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  | Cynanche | 
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  | Cyphosis - see Kyphosis | 
  | Cyprus fever (see also Brucellosis) 023.9 | 
  | Cyriax's syndrome (slipping rib) 733.99 | 
  | Cyst (mucus) (retention) (serous) (simple) | 
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  | Cystadenocarcinoma (M8440/3) - see also Neoplasm, by site, malignant | 
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  | Cystadenofibroma (M9013/0) | 
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  | Cystadenoma (M8440/0) - see also Neoplasm, by site, benign | 
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  | Cystic - see also condition | 
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  | Cysticercosis (mammary) (subretinal) 123.1 | 
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  | Cystinosis (malignant) 270.0 | 
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  | Cystitis (bacillary) (colli) (diffuse) (exudative) (hemorrhagic) (purulent) (recurrent) (septic) (suppurative) (ulcerative) 595.9 | 
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  | Cystocele | 
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  | Cystoid | 
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  | Cystoma (M8440/0) - see also Neoplasm, by site, benign | 
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  | Cystopyelitis (see also Pyelitis) 590.80 | 
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  | Cystosarcoma phyllodes (M9020/1) 238.3 | 
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  | Cystourethritis (see also Urethritis) 597.89 | 
  | Cystourethrocele (see also Cystocele) | 
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