O

OBSERVATION SCHEME IN USE
OBSERVATION VALUE
OBSTETRIC DIAGNOSIS
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
OPERATING THEATRE CODE
OPERATION FUNDING FOR NATIONAL JOINT REGISTRY
OPERATION STATUS CODE
ISO 9001 CERTIFICATION EUROPE