| 
   | 
  MBD (minimal brain dysfunction), child (see also Hyperkinesia)  314.9 | 
  MCAD (medium chain acyl CoA dehydrogenase deficiency)  277.85 | 
  McArdle (-Schmid-Pearson) disease or syndrome (glycogenosis V)  271.0 | 
  McCune-Albright syndrome (osteitis fibrosa disseminata)  756.59 | 
  MCLS (mucocutaneous lymph node syndrome)  446.1 | 
  McQuarrie's syndrome (idiopathic familial hypoglycemia)  251.2 | 
  Measles (black) (hemorrhagic) (suppressed)  055.9 | 
   | 
  Meatitis, urethral (see also Urethritis)  597.89 | 
  Meat poisoning - see Poisoning, food  | 
  Meatus, meatal - see condition  | 
  Meat-wrappers' asthma  506.9 | 
  Meckel's  | 
   | 
  Meconium  | 
   | 
  Median - see also condition  | 
   | 
   | 
  Mediastinitis (acute) (chronic)  519.2 | 
   | 
  Mediastinopericarditis (see also Pericarditis)  423.9 | 
   | 
  Mediastinum, mediastinal - see condition  | 
  Medical services provided for - see Health, services provided because (of)  | 
  Medicine poisoning (by overdose) (wrong substance given or taken in error)  977.9 | 
   | 
  Medin's disease (poliomyelitis)  045.9 | 
  Mediterranean  | 
   | 
  Medulla - see condition  | 
  Medullary  | 
   | 
  Medullated fibers  | 
   | 
  Medulloblastoma (M9470/3)  | 
   | 
  Medulloepithelioma (M9501/3) - see also Neoplasm, by site, malignant  | 
   | 
  Medullomyoblastoma (M9472/3)  | 
   | 
  Meekeren-Ehlers-Danlos syndrome  756.83 | 
  Megacaryocytic - see condition  | 
  Megacolon (acquired) (functional) (not Hirschsprung's disease)  564.7 | 
   | 
   | 
  Megaesophagus (functional)  530.0 | 
   | 
  Megakaryocytic - see condition  | 
   | 
  Megalerythema (epidermicum) (infectiosum)  057.0 | 
  Megalia, cutis et ossium  757.39 | 
   | 
  Megalocephalus, megalocephaly NEC  756.0 | 
   | 
   | 
   | 
  Megalodactylia (fingers) (thumbs)  755.57 | 
   | 
   | 
  Megaloesophagus (functional)  530.0 | 
   | 
  Megalogastria (congenital)  750.7 | 
   | 
   | 
   | 
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