ICD-9-CM Volume 2 Index entries containing back-references to 
552.9:
- Hernia, hernial (acquired) (recurrent) 553.9  with with  gangrene (obstructed) NEC 551.9 gangrene (obstructed) NEC 551.9 
  obstruction NEC 552.9 obstruction NEC 552.9
 
  colic 553.9 colic 553.9   with with   gangrene (obstructed) 551.9 gangrene (obstructed) 551.9 
   obstruction 552.9 obstruction 552.9
 
 
  colon 553.9 colon 553.9   with with   gangrene (obstructed) 551.9 gangrene (obstructed) 551.9 
   obstruction 552.9 obstruction 552.9
 
 
  diverticulum, intestine 553.9 diverticulum, intestine 553.9   with with   gangrene (obstructed) 551.9 gangrene (obstructed) 551.9 
   obstruction 552.9 obstruction 552.9
 
 
  gastrointestinal tract 553.9 gastrointestinal tract 553.9   with with   gangrene (obstructed) 551.9 gangrene (obstructed) 551.9 
   obstruction 552.9 obstruction 552.9
 
 
  incarcerated (see also Hernia, by site, with obstruction) 552.9 incarcerated (see also Hernia, by site, with obstruction) 552.9  gangrenous (see also Hernia, by site, with gangrene) 551.9 gangrenous (see also Hernia, by site, with gangrene) 551.9 
 
  interstitial 553.9 interstitial 553.9   with with   gangrene (obstructed) 551.9 gangrene (obstructed) 551.9 
   obstruction 552.9 obstruction 552.9
 
  inguinal - see Hernia, inguinal inguinal - see Hernia, inguinal
 
  intestine, intestinal 553.9 intestine, intestinal 553.9   with with   gangrene (obstructed) 551.9 gangrene (obstructed) 551.9 
   obstruction 552.9 obstruction 552.9
 
 
  intra-abdominal 553.9 intra-abdominal 553.9   with with   gangrene (obstructed) 551.9 gangrene (obstructed) 551.9 
   obstruction 552.9 obstruction 552.9
 
 
  intraparietal 553.9 intraparietal 553.9   with with   gangrene (obstructed) 551.9 gangrene (obstructed) 551.9 
   obstruction 552.9 obstruction 552.9
 
 
  irreducible (see also Hernia, by site, with obstruction) 552.9 irreducible (see also Hernia, by site, with obstruction) 552.9  gangrenous (with obstruction) (see also Hernia, by site, with gangrene) 551.9 gangrenous (with obstruction) (see also Hernia, by site, with gangrene) 551.9 
 
  Littre's (diverticular) 553.9 Littre's (diverticular) 553.9   with with   gangrene (obstructed) 551.9 gangrene (obstructed) 551.9 
   obstruction 552.9 obstruction 552.9
 
 
  obstructive (see also Hernia, by site, with obstruction) 552.9 obstructive (see also Hernia, by site, with obstruction) 552.9  gangrenous (with obstruction) (see also Hernia, by site, with gangrene) 551.9 gangrenous (with obstruction) (see also Hernia, by site, with gangrene) 551.9 
 
  parietal 553.9 parietal 553.9   with with   gangrene (obstructed) 551.9 gangrene (obstructed) 551.9 
   obstruction 552.9 obstruction 552.9
 
 
  Richter's (parietal) 553.9 Richter's (parietal) 553.9   with with   gangrene (obstructed) 551.9 gangrene (obstructed) 551.9 
   obstruction 552.9 obstruction 552.9
 
 
  strangulated (see also Hernia, by site, with obstruction) 552.9 strangulated (see also Hernia, by site, with obstruction) 552.9  gangrenous (with obstruction) (see also Hernia, by site, with gangrene) 551.9 gangrenous (with obstruction) (see also Hernia, by site, with gangrene) 551.9 
 
 
- Incarceration, incarcerated enterocele 552.9 enterocele 552.9
  epiplocele 552.9 epiplocele 552.9
  rupture (meaning hernia) (see also Hernia, by site, with obstruction) 552.9 rupture (meaning hernia) (see also Hernia, by site, with obstruction) 552.9  gangrenous (see also Hernia, by site, with gangrene) 551.9 gangrenous (see also Hernia, by site, with gangrene) 551.9 
 
  sarcoepiplocele 552.9 sarcoepiplocele 552.9
 
- Rupture, ruptured 553.9  obstructed (see also Hernia, by site, with obstruction) 552.9 obstructed (see also Hernia, by site, with obstruction) 552.9  gangrenous (see also Hernia, by site, with gangrene) 551.9 gangrenous (see also Hernia, by site, with gangrene) 551.9 
 
 
- Strangulation, strangulated 994.7  rupture (see also Hernia, by site, with obstruction) 552.9 rupture (see also Hernia, by site, with obstruction) 552.9  gangrenous (see also Hernia, by site, with gangrene) 551.9 gangrenous (see also Hernia, by site, with gangrene) 551.9 
 
  stomach, due to hernia (see also Hernia, by site, with obstruction 552.9 stomach, due to hernia (see also Hernia, by site, with obstruction 552.9  with gangrene (see also Hernia, by site, with gangrene) 551.9 with gangrene (see also Hernia, by site, with gangrene) 551.9