Supplemental material: Healthcare utilization and costs following molecular diagnostic testing among patients with vaginitis

These are peer-reviewed supplementary materials for the article 'Healthcare utilization and costs following molecular diagnostic testing among patients with vaginitis' published in the Journal of Comparative Effectiveness Research.

• Supplemental Table 1: ICD-10-CM Diagnosis codes used to identify patients with diagnosis or symptoms for vaginitis
• Supplemental Table 2: CPT/HCPCS codes for vaginitis testing

Aim: Vaginitis and other vaginal discharge syndromes lead to high healthcare utilization. Molecular tests like syndromic multiplex real-time (RT) polymerase chain reaction (PCR)-based tests are highly sensitive and specific at diagnosing the infectious causes of vaginitis. This study compared the healthcare resource utilization (HCRU) and direct all-cause healthcare costs among patients with vaginitis in the US receiving next-day syndromic multiplex RT-PCR tests with those receiving other PCR tests or no diagnostic test of interest. Patients & methods: This retrospective study utilized claims data from IQVIA PharMetrics Plus database to identify adult patients with a diagnosis for vaginitis (first claim = index) from January 2021 to April 2023, with 6 months of continuous enrollment prior to (baseline) and after index (follow-up). Pairwise comparisons were conducted between RT-PCR and 1:1 propensity matched Other PCR and No Test subcohorts for all-cause HCRU and costs during follow-up. Results: Each of the RT-PCR, Other PCR and No Test subcohorts included 1946 matched patients. Mean(SD) follow-up total cost was significantly lower for the RT-PCR than the No Test subcohort ($5607 [$15,122] vs $6680 [$20,751], p = 0.0023).Mean(SD) overall outpatient and other medical service costs were lower for RT-PCR versus Other PCR (outpatient: $2964 [$9666] vs $3174 [$7113], p = 0.0110; other medical: $1961 [$9244] vs $2099 [$6475], p = 0.0002) and No Test subcohorts (outpatient: $2964 [$9666] vs $4067 [$12,341], p < 0.0001; othermedical: $1961 [$9244] vs $2973 [$11,685]; p < 0.0001). A lower proportion had any outpatient service HCRU in RT-PCR versus Other PCR subcohort (92.6% vs 94.2%, p = 0.0349). A lower proportion had any other medical service claim in RT-PCR versus Other PCR (78.3% vs 83.2%, p < 0.0001) and No Test subcohorts (78.3% vs 83.0%, p = 0.0001). Physician office, emergency room (ER), prescription use and costs were similar between the subcohorts. Conclusion: The use of syndromic multiplex RT-PCR diagnostics with next day test results in patients with vaginitis was associated with lower outpatient costs and total healthcare costs than those in the no test cohort over 6 months. These findings indicate that use of syndromic multiplex RT-PCR diagnostics may contribute to improved patient management compared with clinical diagnosis alone.