The average cost of outpatient care for Medicare recipients with chronic hepatitis B (CH-B) rose by 400% from 2005 to 2014, according to investigators.
Inpatient costs also increased, although less dramatically, reported lead author, of the Inova Fairfax Hospital Center for Liver Diseases in Falls Church, Virginia, and her colleagues. The causes of these spending hikes may range from policy changes and expanded screening to an aging immigrant population.
“According to the National Health and Nutrition Examination Survey, from 1988 to 2012 most people with CH-B in the United States were foreign born and accounted for up to 70% of all CH-B infections,” the authors wrote in the. “The Centers for Disease Control [and Prevention] estimates that Asians, who comprise 5% of the U.S. population, account for 50% of all chronic CH-B infections.” Despite these statistics, the clinical and economic impacts of an aging immigrant population are unknown. The investigators therefore assessed patient characteristics associated with increased 1-year mortality and the impact of demographic changes on Medicare costs.
The retrospective study began with a random sample of Medicare beneficiaries from 2005 to 2014. From this group, 18,603 patients with CH-B were identified by ICD-9 codes V02.61, 070.2, 070.3, 070.42, and 070.52. Patients with ICD-9-CM codes of 197.7, 155.1, or 155.2 were excluded, as were records containing insufficient information about year, region, or race. Patients were analyzed collectively and as inpatients (n = 6,550) or outpatients (n = 13,648).
Cost of care (per patient, per year) and 1-year mortality were evaluated. Patient characteristics included age, sex, race/ethnicity, geographic region, type of Medicare eligibility, length of stay,comorbidity index, presence of decompensated cirrhosis, and/or hepatocellular carcinoma (HCC).
Most dramatically, outpatient charges rose more than 400% during the study period, from $9,257 in 2005 to $47,864 in 2014 (P less than .001). Inpatient charges increased by almost 50%, from $66,610 to $94,221 (P less than .001). (All values converted to 2016 dollars.)
Although the increase in outpatient costs appears seismic, the authors noted that costs held steady from 2005 to 2010 before spiking dramatically, reaching a peak of $58,450 in 2013 before settling down to $47,864 the following year. This spike may be caused by changes in screening measures and policies. In 2009, the American Association for the Study of Liver Diseases expanded screening guidelines to include previously ineligible patients with CH-B, and in 2010, the Centers for Medicare & Medicaid Services expanded ICD-9 and ICD-10 codes for CH-B from 9 to 25.
“It seems plausible that the increase in CH-B prevalence, and its associated costs, might actually be a reflection of [these factors],” the authors noted. Still, “additional studies are needed to clarify this observation.”
Turning to patient characteristics, the authors reported that 1-year mortality was independently associated most strongly with decompensated cirrhosis (odds ratio, 3.02) and hepatocellular carcinoma (OR, 2.64). In comparison with white patients, Asians were less likely to die (OR, 0.47).
“It is possible that this can be explained through differences in transmission mode and disease progression of CH-B between these two demographics,” the authors wrote. “A majority of Asian Medicare recipients with CH-B likely acquired it perinatally and did not develop significant liver disease. In contrast, whites with CH-B generally acquired it in adulthood, increasing the chance of developing liver disease.”
Over the 10-year study period, Medicare beneficiaries with CH-B became more frequently Asian and less frequently male. While the number of outpatient visits and average Charlson comorbidity index increased, decreases were reported for length of stay, rates of 1-year mortality, hospitalization, and HCC – the latter of which is most closely associated with higher costs of care.
The investigators suggested that the decreased incidence of HCC was caused by “better screening programs for HCC and/or more widespread use of antiviral treatment for CH-B.”
“Although advances in antiviral treatment have effectively reduced hospitalization and disease progression,” the authors wrote, “vulnerable groups – especially immigrants and individuals living in poverty – present an important challenge for better identification of infected individuals and their linkage to care. In this context, it is vital to target these cohorts to reduce further mortality and resource utilization, as well as optimize long-term public health and financial benefits.”
Study funding was provided by Seattle Genetics. One coauthor reported compensation from Gilead Sciences, AbbVie, Intercept Pharmaceuticals, GlaxoSmithKline, and Bristol-Myers Squibb.
SOURCE: Kim M et al. J Clin Gastro. 2018 Aug 13.