Variation in Commercial Insurance Type Impacts Access to Cervical Spine Surgery

Abstract

Introduction. Prior literature has demonstrated that disparities exist in health care access and outcomes by insurance status, and patients with commercial plans fare better than those with Medicaid. However, variation may exist within commercial plans, which may impact care access. The purpose of our study was to determine the association between commercial health insurance plan type and access/time to surgery among patients with degenerative cervical conditions. Methods. The MarketScan database (IBM Watson Health, Ann Arbor, MI) was utilized to identify the first instance of International Classification of Diseases-10-CM diagnosis codes for cervical myelopathy and radiculopathy. Patients 65 years old or below enrolled from 2015 to 2020 with a minimum of two years of continuous enrollment were included. Surgery for myelopathy included anterior cervical discectomy and fusion (ACDF), posterior cervical laminectomy and fusion, and laminoplasty, whereas surgery for radiculopathy included ACDF, cervical disk arthroplasty, and foraminotomy. The time between first diagnosis and surgery was determined. Insurance plan type was categorized as noncapitated (NC), non-high-deductible health plan, Health Management Organization-type partially or fully capitated plans, or high-deductible health plans (HDHP). Proportional hazards regression was utilized to compare time-to-incidence of surgery by plan type, adjusting for age, and sex. Results. In total, 55,954 patients with cervical myelopathy and 705,117 patients with cervical radiculopathy were included. Mean follow-up was 537 and 657 days for myelopathy and radiculopathy, respectively. At two years postdiagnosis, 22.6% of myelopathy and 5.6% of radiculopathy patients were managed surgically. ACDF was the most common surgery for both myelopathy (85.7%