Drivers of Healthcare Costs Among the Costliest Patients With Psoriasis Over Three Years in a United States Health Plan
July 2017 | Volume 16 | Issue 7 | Original Article | 651 | Copyright © July 2017
April W. Armstrong MD MPH,a Yang Zhao PhD,b Vivian Herrera PhD,b Yunfeng Li PhD,b Tim Bancroft PhD,e Michael Hull MS,c and Aylin Altan PhDd
aUniversity of Southern California, Los Angeles, CA bHealth Economics and Outcomes Research, Novartis Pharmaceuticals Corporation, East Hanover, NJ cHealth Economics and Outcomes Research, Optum, Eden Prairie, MN dOptum Labs, Eden Prairie, MN
OBJECTIVE: To compare patients with psoriasis by cost level over 3 years.
METHODS: Psoriasis patients in a large US health plan in 2011-2013 were identified. Four groups were created by healthcare costs excluding biologics: patients having top 10% of costs in all 3 years (Top), top 10% in 2 of 3 years (High), bottom 90% in 2 of 3 years (Medium), and bottom 90% in all 3 years (Bottom). Comorbidities, utilization, and costs between groups were compared.
RESULTS: The study included 18,653 patients: 514 (3%), 805 (4%), 2,443 (13%), and 14,891 (80%) patients in the Top, High, Medium, and Bottom groups, respectively. Significantly more patients in the Top vs Bottom group had diabetes (31.1% vs 9.4%), cardiovascular disease (26.5% vs 4.3%), psoriatic arthritis (25.7% vs 10.7%), depression (27.8% vs 6.9%), and anxiety (22.0% vs 7.9%) in 2011 (all P less than 0.05). Patients in the Top group had more unique 2011 prescriptions (17.7 vs 6.6; P less than 0.001) than the Bottom group, but similar biologic use (22.4% vs 21.6%). Patients in the Top, High, Medium, and Bottom groups had mean 2011 total costs of $68,913, $40,575, $24,292, and $8,815, and contributed to 14%, 13%, 23%, and 51% of the overall costs, respectively. Mean total costs increased 14-18% over time for all groups. Although mean 2011 total costs for patients in the Top group were 7.8 times of those in the Bottom group, psoriasis-related costs were less disparate ($8,716 vs $4,541). Compared with patients in the Bottom group, those in the Top group were more likely to have any 2011 hospitalization (36.8% vs 2.6%; psoriasis-related: 11.1% vs 0.7%) or emergency visit (50.8% vs 20.8%; psoriasis-related: 3.9% vs 1.0%).
CONCLUSION: The costliest patients with psoriasis had significantly higher prevalence of comorbidities, prescription fills, inpatient and emergency utilization, but not biologic medication use or biologic costs.
J Drugs Dermatol. 2017;16(7):651-658.