The relationship between adherence and benefit for those prescribed continuous positive airway pressure (CPAP) devices is clear. However, a Medicare-reimbursement rule that demands adherence blind to circumstances appears to be denying access to many low-income patients, according to an analysis delivered at the annual health policy and advocacy conference sponsored by the American College of Chest Physicians.
Dr. Sairam Parthasarathy
Over the past several years, adherence to CPAP has improved substantially following a series of studies that demonstrated the device must be used at least 4 hours per night to achieve improved outcomes. Medicare defines adherence as using the device more than 4 hours per night for 70% of nights (21 nights) during a consecutive 30-day period any time in the first 3 months of initial usage.
However, the studies that show improved adherence show a lag among those in the lowest income quartile, according to Sairam Parthasarathy, MD, director of the Center for Sleep and Circadian Sciences at the University of Arizona, Tucson.
When patients are followed for a year after being prescribed CPAP, the lag for the low-income patients is not seen immediately. Rather, adherence studies show a steady climb in adherence in all income groups initially, but ”right at 90 days there is a marked change,” said Dr. Parthasarathy.
This change happens to coincide with Medicare policy that denies reimbursement for CPAP after 90 days if patients are not using CPAP at least 4 hours per night, which is the threshold associated with benefit.
The correlation between this policy and income disparity is “observational” rather than proven, but Dr. Parthasarathy is confident it is valid. He believes it is a prime example of a health inequity driven by poorly conceived policy.
“The 90-day rule needs to go,” he said, calling the choice of threshold “man-made.” He added: “This is the only disease condition for which a therapy is withheld if it is not used according to some magical threshold. I cannot think of a more draconian policy.”
In an effort to illustrate the problem, he likened this policy to withholding insulin in a diabetes patient judged nonadherent because of a persistently elevated Hb1Ac.
At 90 days, adherence rates remain at a relatively early point in their upwards trajectory in all income groups. One year later, adherence rates are more than twice as high in the highest income relative to the lowest quartile and approaching twofold greater in quartiles 2 and 3.
“It takes time to get used to these devices,” Dr. Parthasarathy explained. Given studies demonstrating that “more is better” with CPAP, whether measured by sleep scales or quality of life, Dr. Parthasarathy advocates strategies to improve adherence, but he questioned an approach that penalizes low-income patients for a definition of nonadherence at an arbitrary point in time. He suggested it is just one example of health policies that ultimately penalize individuals with lower incomes.
“There are millions of dollars spent every year on understanding the genetics of disease, but the biggest influence on how long you live is the ZIP code of where you live,” said Dr. Parthasarathy, referring to ZIP codes as a surrogate for socioeconomic status.
This is not to imply, however, that genetics are irrelevant, Dr. Parthasarathy said. He pointed to data linking genetic traits that determine melanin levels and circadian rhythms. He noted one genotype associated with later bedtimes that is more commonly found in African-Americans and Hispanics. This has relevance to a variety of sleep disorders and other health conditions, but it might serve as a fundamental disadvantage for children with this genotype, Dr. Parthasarathy maintained. He cited a study conducted at his center that found Hispanic children sleep on average 30 minutes less than White children (Sleep Med 2016;18:61-6). The reason was simple. Hispanic children went to bed 30 minutes later but rose at the same time.
The later bedtimes and reduced sleep could potentially be one obstacle among many, such as the need for lower-income patients to hold several jobs, that prevent these patients from becoming accustomed to CPAP at the same speed as wealthier patients, according to Dr. Parthasarathy.
The current Medicare policy that withholds CPAP on the basis of a single definition of nonadherence appears to lead directly to an inequity in treatment of sleep apnea, he maintained. Dr. Parthasarathy, who was a coauthor of a recently published paper on addressing disparities in sleep health (Chest 2021;159:1232-40), described this issue as part of a larger problem of the failure to deliver health care that is sensitive to the cultural and racial differences underlying these inequities.
Kathleen Sarmiento, MD, FCCP, director, VISN 21 Sleep Clinical Resource Hub for the San Francisco VA Health Care System, agreed. “This type of issue is exactly what our committee would like to address,” said Dr. Sarmiento, a member of the CHEST Health Policy and Advocacy Committee and the moderator of the session in which Dr. Parthasarathy presented his data.
Courtesy Dr. Sarmiento
Dr. Kathleen Sarmiento
The association between the 90-day Medicare rule for CPAP reimbursement and reduced access to this therapy among patients of lower economic status is compelling, she indicated. Within the goal of advocacy for health policies that will reduce inequities, Dr. Sarmiento explained that the committee is attempting to identify and reverse the source of these types of disparity.
“Specific rules or regulations are actionable targets to effect broader change in health care access and health care delivery,” said Dr. Sarmiento, alluding to the mission of the Health Policy and Advocacy Committee.
Dr. Parthasarathy and Dr. Sarmiento report no relevant conflicts of interest.