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OBSERVATION SCHEME IN USE
OBSERVATION VALUE
OBSTETRIC DIAGNOSIS
OESOPHAGECTOMY ANASTOMOSIS TYPE
OESOPHAGECTOMY NECK DISSECTION INDICATOR
OESOPHAGECTOMY OESOPHAGEAL CONDUIT NECROSIS FAILURE TYPE
OESOPHAGECTOMY OESOPHAGEAL CONDUIT TYPE
OESOPHAGECTOMY SURGICAL APPROACH TYPE
OESOPHAGOENTERIC LEAK SEVERITY TYPE
OFFENCE HISTORY INDICATION CODE
OFFERED FOR ADMISSION DATE
OFFER OF ADMISSION MADE DATE
OFFER OF ADMISSION MADE TIME
OMENTUM INVOLVEMENT INDICATION CODE
ONS ORGANISATION IDENTIFIER
ONWARD REFERRAL REASON
OPEN OESOPHAGECTOMY SURGICAL APPROACH TYPE
OPERATING THEATRE CODE
OPERATION FUNDING FOR NATIONAL JOINT REGISTRY
OPERATION STATUS CODE
ISO 9001 CERTIFICATION EUROPE