THE Green Paper unveiled yesterday sets out five options for health care financing, of which three are favoured by the Government. One option suggests decreasing the Government's percentage of subsidy for general ward fees. The second proposes luring wealthier patients to more costly but more comfortable accommodation and introducing extra charges for different medical procedures. Two of the options look at compulsory versus voluntary medical insurance schemes, while the fifth suggests funding according to priority of treatment. Secretary for Health and Welfare Elizabeth Wong Chien Chi-lien said implementing a combination of options would enable Hongkong to keep its heavily government-subsidised system, offer more choice of care and increase revenue sources for public hospitals. Option A - the percentage subsidy approach - proposes: Pegging costs to actual operating costs instead of to food costs, as at present; Keeping a flat fee per day but reducing the level of government subsidy. Patients now pay $43 per day for a general ward bed, which includes all medication, laboratory tests and surgery. This fee is about two per cent of the real cost of $2,105 for a bed in an acute hospital such as Queen Mary. Under Option A, a 95 per cent subsidy level would mean patients would pay $105 per day, or $63 with a 97 per cent subsidy. Mrs Wong said the Government favoured this option, which also included a waiver system for those who could not pay. ''Our method of calculating medical costs must be reasonable and affordable,'' she said. ''I myself would not suggest we peg it at more than five per cent of the operating cost.'' Option B - the target group approach - is also favoured by the Government. It proposes: Semi-private rooms in public hospitals; Itemised charging; Full or partial waivers for target groups. Mrs Wong said semi-private rooms - the Government's B-class bed proposal - would offer patients a ''half-way house'' between private and public hospitals, with more comfortable accommodation. Itemised charging could mean extra fees such as a hospital admission charge, possibly $100; a first-time registration fee of perhaps $50 plus drug charges for specialist clinics; and an accident and emergency service charge. Mrs Wong said no one would be denied treatment because of a lack of money. Option C - the co-ordinated voluntary insurance scheme - is also favoured by the Government. Under this option, private insurance companies would submit insurance plans for approval by a designated body. The plans would be improved only if they met criteria on coverage and premium levels. The Green Paper says the advantage of voluntary insurance is relatively little government intervention, but points out that high-risk groups may find difficulty in obtaining cover. Option D - compulsory comprehensive insurance - is frowned on because it would require compelling all households in Hongkong to take part in an insurance scheme, the paper says. The Government also dislikes Option E - priority of treatment. Under this option, resources would be concentrated on patients with high priority conditions.