# Appendix 5: Projected Liabilities

A.5.1 The Medical Indemnity Act requires that the report include a projection of the Commonwealth’s liabilities in relation to amounts of Run-Off Commonwealth contributions in future financial years. This Appendix summarises the results of that projection, describes the methodology and assumptions and discusses the uncertainty in relation to the liability projections.

## Summary of Projected Liability

A.5.2 In line with previous reports, we have projected the liabilities forward from the valuation date by taking the liability at the valuation date, adding the interest assumed in the valuation, adding an amount for new accrued claims and deducting payments expected in that year along with their associated claims handling expenses.

A.5.3 Table 15 below sets out estimates of the liabilities of the Notional Account at the end of each of the next five financial years. The purpose is to illustrate the short-term development of the Scheme. There is substantial uncertainty in these estimates. The numbers shown have been discounted to the end of the relevant financial year but have not been discounted to give values in today’s terms. The projected liabilities are not too dissimilar from the corresponding amounts presented in last year’s report.

Table 15: Projected balance sheet liabilities of the Notional Account

## Description of the model used to project the accrual of new Run-Off Cover Scheme liabilities after 30 June 2018

A.5.4 The approach involved projecting the expected future ROC indemnity payments for each medical practitioner who was practising as at 30 June 2018.

A.5.5 A practitioner can become eligible for the Scheme by reason of:

- retirement at 65 years and older;
- permanent disability;
- death;
- maternity;
- resignation; or
- satisfaction of other eligibility criteria specified in the regulations.

A.5.6 The probability of becoming eligible for the Scheme was estimated for each practitioner based on their age as at 30 June 2018 and their gender. Note that practitioners do not become eligible by means of resignation until three years have passed since cessation of practice.

A.5.7 The estimated likelihood of practitioners becoming eligible for the Scheme was overlaid on the projected claim notifications to give the projected ROC claim notifications for each practitioner. The expected notified claims cost was multiplied by the likelihood of eligibility in each future year, and summed across all practitioners to arrive at the expected cost of ROC claims notified in that year.

A.5.8 It was assumed that on average practitioners who become eligible for the Scheme do so half-way through the financial year.

A.5.9 Projection of indemnity payments entailed the projection of:

- incidents which will result in a claim;
- the delay involved in notification of claims;
- the cost of claims after allowing for the HCCS;
- the likelihood of eligibility for the Scheme at the time a claim is notified; and
- the delay involved in the payment of notified claims.

A.5.10 The total expected future ROC claim notifications were calculated as the scalar product of the vector of claim notifications and the vector of probabilities of Scheme eligibility for each practising medical practitioner in each future year.

## Run-Off Cover claims

### Components of claim cost

A.5.11 For the purposes of the model, a ROC claim includes any eligible claim notified and finalised at direct cost to the MII. Claim costs include all costs which are directly attributable to the claim. Indirect claims handling expenses (CHE) are dealt with separately.

A.5.12 Directly attributable claim costs include damages, plaintiff legal costs to the extent that they are awarded, and legal defence costs to the extent that they are directly attributable to the claim.

### Assumptions

A.5.13 Last year, for the first time we have had access to the NCPD data. This allowed us to review and update a range of assumptions at that time.

A.5.14 Apart from the reduction in the long term discount rate from 6 per cent per annum to 5 per cent per annum, we have not altered any of the assumptions in this review. Economic assumptions are set out in Appendix 4 and have been used consistently in both the calculation of the liability at the valuation date and in the projection.

### Practitioner population

A.5.15 As noted above, the analysis aims to project the expected future ROC indemnity payments for each medical practitioner who was practising as at 30 June 2018. This starts with the population of medical practitioners who were practicing in 2017-18. This data is provided by the MIIs and maintained by DHS.

A.5.16 Practitioners with total medical indemnity payments (including both medical indemnity premiums net of discounts and loadings plus membership fees) of less than $1,700 were excluded from the analysis in order to ensure that only genuine ‘at-risk’ medical practitioners were the focus of the investigation. The excluded group contained interns and trainees that exist in some of the data provided by the MIIs. A total of 89,857 practising medical practitioners have paid some medical indemnity premium during 2017-18. After excluding those medical practitioners, we were left with 50,839 ‘at-risk’ medical practitioners. This approach is unchanged from our previous reports.

A.5.17 Table 16 summarises the age distribution of the cohort of ‘at-risk’ practitioners, with the total premium representing a proxy for risk of medical indemnity claims for each age group. Note that age and gender were not available for a small number of medical practitioners.

Table 16: Cohort of ‘at-risk’ medical practitioners

Note: Numbers may not add due to rounding. Total premium includes membership fees. If membership fees are excluded, total premium across both categories is approximately $360 million.

### Demographic assumptions

A.5.18 Demographic assumptions are required to project the number of eligible medical practitioners in future years from the current population of ‘at risk’ medical practitioners. We have not changed any of the assumptions this year.

A.5.19 In order to assess the future rate at which liabilities will accrue, we project the expected number of 2018-19 new entrants in the categories that are expected to generate a future liability. Those events that are expected to generate a material liability under the scheme are considered to be retirement at 65 or older, resignation from private practice for three years, death, permanent disability and maternity leave. We have not projected new entrants in the ‘other’ category. Historically, practitioners in this category have paid very low premiums. Accordingly, we have assumed that medical negligence claims against them are likely to make an immaterial contribution to the Scheme costs.

A.5.20 The probabilities of death and disablement are assumed to be an increasing multiple of the probabilities of death in *Australian Life Tables 2010-12* (ALT 2010-12). The probabilities of death are assumed to be 28 per cent of ALT 2010-12 until age 64, 40 per cent from age 65 to 69, and 48 per cent of ALT 2010-12 thereafter. The probabilities of permanent disability are assumed to be 12 per cent of ALT 2010-12 up to age 24, an increasing multiple of ALT 2010-12 from 12.3 to 24 per cent from age 25 to 64, and 0 from 65 onwards.

A.5.21 Probabilities of maternity leave were assumed for ages between 27 and 44. Each medical practitioner was assumed to take one year of maternity leave for each child.

A.5.22 Probabilities of resignation were assumed for ages between 29 and 64. It was assumed that the probability decreases with age before increasing again from age 60.

A.5.23 Probabilities of resignation were assumed for ages between 65 and 89. We have assumed that all medical practitioners will retire before age 71. We have allowed slight differences between males and females based on historical experience.

A.5.24 It is instructive to combine the above assumptions and present the probabilities that a practising male medical practitioner will be eligible for the Scheme in future years. The decrement assumptions are summarised in Table 17 in the form of assumed probabilities of being eligible for the Scheme at the end of each of the next 10 financial years for males.

Table 17: Assumed probabilities of eligibility for the Run-Off Cover Scheme over the next 10 financial years for male medical practitioners

A.5.25 The resulting number of practitioners who are expected to become eligible in 2018-19 is set out in section Table 20.

### Population average claim frequency

A.6.26 The overall claim frequency for the entire at risk population was assumed to be 4 per cent. That is, on average each ‘at-risk’ medical practitioner was assumed to have a 4 per cent chance of being involved in a medical incident in the next year which will result in a future medical indemnity claim. This is unchanged from last year.

A.5.27 Individual claim frequencies were then adjusted based on premium as discussed below. This approach has not been changed from our previous reports.

### Individual claim frequencies based on premium

A.5.28 The likelihood of future notifications of ROC claims was projected according to the assumed ‘riskiness’ of each individual practitioner. The risk of medical indemnity claims posed by each practitioner was determined based on risk categorisation. Practitioners were categorised according to specialisation, age, gender and MII.

A.5.29 The average premium for each risk group was used as a proxy for the risk of medical indemnity claims. The claim frequency for each group was multiplied by the ratio of the premium for the group to the premium of the entire cohort of ‘at-risk’ medical practitioners.

A.5.30 Although insurance premiums are broadly determined in line with claim risk, the premium of a group is at best an imprecise proxy for risk. For example, market and financial considerations affect premiums charged. However, given the data available, relative premiums have been assumed to be a reasonable means of categorising practitioners according to their risk of medical indemnity claims for the purposes of this model.

A.5.31 Insurance premiums tend to diminish for practitioners towards retirement age. This supports the suggestion that medical practitioners tend to wind down their practice hours and possibly perform fewer risky medical procedures (for example, surgery) as they approach retirement. The possible reduction in risk towards retirement is somewhat apparent from the pattern of relative premiums for ‘at-risk’ medical practitioners shown in Figure 5. Note that age and gender were not available for a small number of medical practitioners.

Figure 5: Relative premiums by age for ‘at-risk’ medical practitioners

Note: The graph includes all practitioners with total payments (including membership fees) of at least $1,700 from all MIIs.

### Individual claim frequencies based on assumed wind down of risky practice

A.5.32 The relative premiums of older medical practitioners appear to indicate a reduction in risky practice as medical practitioners approach retirement. Consistent with this, industry actuaries have also suggested that medical practitioners tend to wind down riskier elements of their practice as they approach retirement. However, relative premiums may not capture the full extent of the reduction, since premiums are calculated on a claims-made rather than claims-occurring basis.

A.5.33 We have continued the practice of assuming that medical practitioners wind down their risk exposure from age 60, at a rate that is reflected in the premiums shown above. Premium relativities are augmented with a wind down from age 60 according to the exponential formula 0.8^{(age-59)}. This is unchanged from last year.

A.5.34 This assumption is very subjective and is not amenable to objective validation. Nonetheless, it does not appear unreasonable in light of observed claim experience.

### Claim size

A.5.35 Claim sizes are assumed to increase, the longer the delay from the incident occurring until it is notified to the insurer. This is on the basis that claims which take longer to report tend to be bigger on average. One example is cerebral palsy cases.

A.5.36 The average claim size was assumed to be around $140,000. This was unchanged from last year.

A.5.37 The assumed claim reporting pattern is shown in Table 18 below. Assumed claim sizes presented in the table do not include allowance for inflation or superimposed inflation.

Table 18: Claim reporting and size pattern

(a) Gross average claim sizes presented in the table are intended to be in 2018 dollars and do not include allowance for inflation and superimposed inflation.

A.5.38 The projected ROC claims cost is sensitive to the proportion of claims which are assumed to be reported late. The longer the delay between the incident and the claim, the greater the likelihood that a practitioner will be eligible for the Scheme at the time the claim is notified. Thus, the majority of Scheme cost relates to the small proportion of claims which are notified very late.

### Impact of the High Cost Claim Indemnity on claim size

A.5.39 The claims cost net of the HCCS indemnities is calculated assuming that the HCCS threshold will change such that a constant proportion of the gross average claim size will be met by the HCCS. Thus, for simplicity, the HCCS threshold is assumed to increase in line with claims inflation over time.

A.5.40 The model effectively assumes that 17 per cent of the ROC discounted claims cost will be met by the HCCS. This is explained in more detail in Appendix 6.

### Payment patterns – notification to settlement

A.5.41 ROC indemnity payments in relation to medical incidents occurring after 30 June 2018 were projected assuming the payment patterns from the point of notification to the point of settlement, as set out in Table 19 below. This payment pattern was unchanged from last year.

Table 19: Payment pattern assumed

## Projection Results

### Projection of ‘at-risk’ medical practitioners

A.5.42 We have applied the demographic assumptions to the at risk population to project the new ‘at-risk’ medical practitioners expected to join the scheme in future years.

A.5.43 Figure 6 depicts the number of ‘at-risk’ practitioners projected to become eligible for the Scheme by various means during the 2018-19 financial year. Although medical practitioners will become eligible for the Scheme during 2018-19 by way of cessation of practice (having ceased practice during 2015-16), the number below refers to medical practitioners who will actually become eligible during 2021-22.

Figure 6: Projected entries of ‘at-risk’ practitioners to the Run-Off Cover Scheme based on decrement assumptions

A.5.44 The numbers of practitioners projected to enter the Scheme are more in line with the long term historical numbers (excluding “Other”) provided by the insurers as shown in Table 20. Note that while the number of practitioners who became eligible for the Scheme in 2017-18 through maternity and resignation was higher than historical averages, the movement is within an acceptable range given the volatilities we have observed in the past. Thus, we have not adjusted any of the eligibility assumptions this year, especially given major changes were implemented last year which included higher maternity and resignation assumptions. The eligibility assumptions are subject to review each year, and we tend to update the assumptions when there is sufficient evidence to support a fundamental shift in experience.

Table 20: Run-Off Cover Scheme historical and projected new entrants by reason of eligibility

(a) Overseas trained medical practitioners who had permanently ceased practice in Australia under an appropriate visa.

A.5.45 Where the date of birth or gender was not available for a practitioner, these were assigned randomly according to the age and gender distribution of ‘at-risk’ medical practitioners.

### Projection of future Run-Off Cover Scheme costs

A.5.46 Table 21 summarises the next 10 years’ ROC indemnity payments which were aggregated to derive the projected Scheme costs in future years.

Table 21: Calculation of projected Run-Off Cover indemnity payments

Note: numbers may not add up due to rounding.

## Uncertainty in relation to liability projections

A.5.47 The projected ROC indemnity payments summarised in Table 20 are subject to uncertainty which relates to:

- data in relation to the claiming behaviour of eligible practitioners;
- substantial random variation associated with medical incidents and the notification of claims from year to year;
- calibration of the model claim size and claim frequency assumptions to the underlying claim process (medical indemnity liabilities are characterised by few claims associated with large random variation such that a wide range of results can be obtained with equal statistical validity);
- the extent to which medical practitioners approaching retirement might cut down on their practice hours and possibly engage in less ‘risky’ practice (for example, less surgery);
- sensitivity of the model to the proportion of late-reported claims;
- sensitivity of the model to the decrement assumptions;
- the possibility that not all Scheme eligible claims have been identified and that recoveries will be more diligently pursued later in the claim process; and
- tort reforms in a number of jurisdictions with the possible effect of ‘bringing forward’ claims and distorting claim experience.

A.5.48 The information provided by the actuaries of the MIIs and MDOs relied on broadly similar valuation models. The range of assumptions adopted by industry actuaries reflects the substantial uncertainty involved in estimating liabilities of the Scheme.

A.5.49 It must be emphasised that different results can be obtained from different yet equally plausible models and assumptions. Again, this is a common issue with liabilities of this nature.