What happens to drug use and expenditure when cost sharing is completely removed? Evidence from a Canadian provincial public drug plan

The Associations of Prescription Drug Insurance and Cost-Sharing With Drug Use, Health Services Use, and Health: A Systematic Review of Canadian Studies

OBJECTIVES

In Canada, public insurance for physician and hospital services, without cost-sharing, is provided to all residents. Outpatient prescription drug coverage, however, is provided through a patchwork system of public and private plans, often with substantial cost-sharing, which leaves many underinsured or uninsured.

METHODS

We conducted a systematic review to examine the association of drug insurance and cost-sharing with drug use, health services use, and health in Canada. We searched 4 electronic databases, 2 grey literature databases, 5 specialty journals, and 2 working paper repositories. At least 2 reviewers independently screened articles for inclusion, extracted characteristics, and assessed risk of bias.

RESULTS

The expansion of drug insurance was associated with increases in drug use, individuals who reported drug insurance generally reported higher drug use, and increases in and higher levels of drug cost-sharing were associated with lower drug use. Although a number of studies found statistically significant associations between drug insurance or cost-sharing and health services use, the magnitudes of these associations were generally fairly small. Among 5 studies that examined the association of drug insurance and cost-sharing with health outcomes, 1 found a statistically significant and clinically meaningful association. We did not find that socioeconomic status or sex were effect modifiers; there was some evidence that health modified the association between drug insurance and cost-sharing and drug use.

CONCLUSIONS

Increased cost-sharing is likely to reduce drug use. Universal pharmacare without cost-sharing may reduce inequities because it would likely increase drug use among lower-income populations relative to higher-income populations.

Association of Participation in a Value-Based Insurance Design Program With Health Care Spending and Utilization

Importance

Value-based insurance design (VBID) has mostly been used in improving medication use and adherence for certain conditions or patients, but its outcomes remain uncertain when applied to other services and to all health plan enrollees.

Objective

To determine the association of participation in a California Public Employees' Retirement System (CalPERS) VBID program with its enrollees' health care spending and utilization.

Design, Setting, and Participants

A retrospective cohort study with difference-in-differences propensity-weighted 2-part regression models was performed in 2021 to 2022. A VBID cohort was compared with a non-VBID cohort both before and after VBID implementation in California in 2019 with 2 years' follow-up. The study sample included CalPERS preferred provider organization continuous enrollees from 2017 through 2020. Data were analyzed from September 2021 to August 2022.

Exposures

The key VBID interventions include (1) if selecting and using a primary care physician (PCP) for routine care, PCP office visit copayment is $10 (otherwise, PCP office visit copayment is $35 as for specialist visit); and (2) annual deductibles reduced by a half through completion of the following 5 activities: annual biometric screening, influenza vaccine, nonsmoking certification, second opinion for elective surgical procedures, and disease management participation.

Main Outcomes and Measures

The primary outcome measures included annual per member total approved payments for multiple inpatient and outpatient services.

Results

The 2 compared cohorts of 94 127 participants (48 770 were female [52%]; 47 390 were younger than 45 years old [50%]) had insignificant baseline differences after propensity-weighting adjustment. The VBID cohort had significantly lower probabilities of inpatient admissions (adjusted relative odds ratio [OR], 0.82; 95% CI, 0.71-0.95), and higher probabilities of receiving immunizations (adjusted relative OR, 1.07; 95% CI, 1.01-1.21) in 2019. Among those with positive payments, VBID was associated with higher mean total allowed amounts for PCP visits in 2019 and 2020 (adjusted relative payments ratio, 1.05; 95% CI, 1.02-1.08). There were no significant differences for inpatient and outpatient combined totals in 2019 and 2020.

Conclusions and Relevance

The CalPERS VBID program achieved desired goals for some interventions with no added total costs in its first 2 years of operation. VBID may be used to promote valued services while containing costs for all enrollees.

The impact of introducing multidisciplinary care assessments on access to rheumatology care in British Columbia: an interrupted time series analysis

Background

In 2011 the British Columbia (BC) Ministry of Health introduced a new fee-for-service billing code that allowed “Multidisciplinary Care Assessment” (MCA). This change has the potential to change access to and quality of care for patients. This study aimed to explore the impact on access to rheumatology services in the province.

Methods

Fee-for-service rheumatology billings were evaluated for each rheumatologist 2 years before and after use of the MCA code. Numbers of 1) unique patients and 2) services provided per month were used as proxy measures of access to care. A multiple-baseline interrupted time series model assessed the impact of the MCA on levels and trends of the access outcomes.

Results

Our analysis consisted of 82,360 patients cared for by 26 rheumatologists who billed for an MCA. In our primary analysis we observed a sustained increase in the mean number of unique patients of 4.9% (95% CI: 0.0% to 9.9%, p = 0.049) and the mean number of services of 7.1% (95% CI: 1.0% to 13.6%, (p = 0.021), per month provided by a rheumatologist, corresponding to the initial use of MCA.

Conclusion

The introduction of the MCA code was associated with an initial increase in the measures of access, which was maintained but did not increase over time. Our study suggests that the use of Multidisciplinary Care Assessment can contribute to expanding and/or sustaining access to care for people with complex chronic conditions, like rheumatic diseases.

Supplementary Information

The online version contains supplementary material available at 10.1186/s12913-022-07715-x.

Effects of the Full Coverage Policy of Essential Medicines on Inequality in Medication Adherence: A Longitudinal Study in Taizhou, China

The full coverage policy for essential medicines (FCPEMs) was proposed and implemented in Taizhou city of Zhejiang Province, China, to promote equal access and adherence to medicines. This study aimed to examine the effects of FCPEMs on the income-related inequality in medication adherence among local patients with hypertension or diabetes. We collected electronic health records of patients with hypertension or diabetes of three districts of Taizhou from 2011 to 2016. As the implementation schedule of the FCPEMs varied across districts, we applied a retrospective longitudinal study design and assigned records from 1 year before to 3 years following the implementation of FCPEMs as baseline and follow-up data. We thus generated a dataset with 4-year longitudinal data. The concentration index (CI) and its decomposition method were employed to measure factors contributing to inequality in medication adherence and the role played by FCPEMs. The sample size rose from 264,836 at the baseline to 315,677, 340,512, and 355,676 by each follow-up year, and the proportion of patients taking free medicines rose from 17.6 to 25.0 and 29.8% after FCPEMs implementation. The proportion of patients with high adherence increased from 39.9% at baseline to 51.6, 57.2, and 60.5%, while CI decreased from 0.073 to −0.011, −0.029, and −0.035. The contribution of FCPEMs ranked at 2nd/13, 7th/13, and 2nd/13 after the implementation of FCPEMs. Changes in CI of medication adherence for every 2 years were −0.084, −0.018, and −0.006, and the contribution of FCPEMs was −0.006, 0.006, and 0.007, ranking at 2nd/13, 2nd/13, and 1st/13, respectively. Most changes in CI of medication adherence can be attributed to FCPEMs. The medication adherence of patients with hypertension or diabetes improved after the implementation FCPEMs in Taizhou, although inequality did not improve consistently. In general, FCPEMs could be a protective factor against income-related inequalities in access and adherence to medicines. Future research is needed to investigate the change mechanism and the optimal design of similar interventions.

Factors Associated with Free Medicine Use in Patients with Hypertension and Diabetes: A 4-Year Longitudinal Study on Full Coverage Policy for Essential Medicines in Taizhou, China

Full coverage policies for medicines have been implemented worldwide to alleviate medicine cost burden and promote access to medicines. However, few studies have explored the factors associated with free medicine use in patients with chronic diseases. This study aimed to analyze the utilization of free medicines by patients with hypertension and diabetes after the implementation of the full coverage policy for essential medicines (FCPEM) in Taizhou, China, and to explore the factors associated with free medicine use. We conducted a descriptive analysis of characteristics of patients with and without free medicine use and performed a panel logit model to examine factors associated with free medicine use, based on an electronic health record database in Taizhou from the baseline year (12 months in priori) to three years after FCPEM implementation. After FCPEM implementation, the proportion of patients without any free medicine use decreased from 31.1% in the baseline year to 28.9% in the third year, while that of patients taking free medicines rose from 11.0% to 22.8%. Patients with lower income or education level, those with agricultural hukou, patients aged 65 and above, married patients, and patients in the Huangyan district were more likely to take free medicines. In conclusion, FCPEM contributed to improved medicine access, especially in vulnerable populations. Local policy makers should consider expanding the coverage of FCPEM to other types of medicines and cultivate the potential of social supports for patients to enhance the effectiveness of FCPEM policies.