15 Temporada
331 Episodi
ER - Season 12
- Curs: 2009
- País: United States of America
- Gènere: Drama
- Estudi: NBC
- Paraula clau: chicago, illinois, hospital, doctor, surgical operation, emergency room, medical drama
- Director: Michael Crichton
- Repartiment: Maura Tierney, Parminder Nagra, Linda Cardellini, Scott Grimes, David Lyons, Angela Bassett