Callistemon21
From the ONS dataset:
Pre-existing conditionICD-10 Codes
Accidental fallsW00-W19
Cardiac arrhythmiasI47-I49
Cerebrovascular diseasesI60-I69
Chronic lower respiratory diseasesJ40-J47
Cirrhosis and other diseases of liverK70-K76
Dementia and Alzheimer's diseaseF01, F03, G30
DiabetesE10-E14
Diseases of the musculoskeletal system and connective tissueM00-M99
Diseases of the urinary systemN00-N39u
Fracture of femurS72
Heart failure and complications and ill-defined heart diseaseI50-I51
Hypertensive diseasesI10-I15
Influenza and pneumoniaJ09-J18
Ischaemic heart diseasesI20-I25
Malignant neoplasms of lymphoid haematopoietic and related tissueC81-C96
ObesityE66
Other medical careZ51
Pulmonary heart disease and diseases of pulmonary circulationI26-I28
Pulmonary oedema and other intestinal pulmonary diseasesJ80-J84
Symptoms signs and ill-defined conditionsR00-R99
So an accidental fall over an object which someone carelessly left in your way is defined as a pre-existing condition!
Accidental falls can and do lead to pneumonia through lack of mobility. Also PE, blood clots, non of these occurring before the fall. So yes a pre condition.