Social Determinants of Health and Insurance Claim Denials for Preventive Care

A peer-reviewed study published in PMC examined the relationship between social determinants of health and insurance claim denial rates for preventive care services. The findings reveal a troubling pattern: patients in communities with higher social vulnerability experience higher rates of insurance denials for preventive services — the very services most likely to reduce long-term healthcare costs and improve population health outcomes.

For physician practices, particularly those serving diverse patient populations, this research adds an equity dimension to the denial management challenge. The data suggests that denial patterns are not distributed equally across patient populations, and that the administrative barriers to care disproportionately affect patients who are already facing socioeconomic disadvantages.

What the Study Found

The research examined denial rates for preventive care services — screenings, immunizations, wellness visits, and other services intended to detect and prevent disease — across patient populations stratified by social determinants of health. Social determinants included factors such as income level, education, housing stability, food security, and neighborhood characteristics.

The study found correlations between higher social vulnerability and higher denial rates for preventive services. While the mechanisms driving this correlation are complex, several contributing factors emerged:

• Insurance type distribution. Patients with higher social vulnerability are more likely to be enrolled in Medicaid, marketplace plans, or lower-tier commercial plans that have higher baseline denial rates and more restrictive coverage criteria.
• Coverage gaps and churn. Patients in economically vulnerable communities experience higher rates of insurance coverage changes, gaps in coverage, and eligibility disruptions — all of which can produce denials related to coverage verification and eligibility.
• Coding and documentation disparities. Practices serving higher-vulnerability populations may face resource constraints that affect documentation quality and coding accuracy — factors that contribute to preventable denials.
• Plan design complexity. Patients with lower health literacy may be enrolled in plans with complex benefit structures that affect coverage for preventive services, including cost-sharing requirements that trigger denials when preventive and diagnostic coding overlap.

The Preventive Care Paradox

The Affordable Care Act requires coverage of recommended preventive services without cost-sharing. In theory, this should eliminate denials for preventive care. In practice, denials persist for several reasons:

Coding determines whether a service is classified as preventive or diagnostic. A screening colonoscopy coded as preventive is covered without cost-sharing. The same procedure coded as diagnostic — because a polyp was found, for example — may be subject to different coverage rules. This coding distinction produces denials that disproportionately affect patients who were seeking preventive care.

Eligibility disruptions can cause denials even for clearly preventive services. A patient who loses Medicaid eligibility between the date of service and the date of claim processing may have their preventive care claim denied despite having been eligible when the service was provided.

The intersection of these factors means that patients who most need preventive care face the highest barriers to coverage — a paradox that physician practices are uniquely positioned to observe and address.

Implications for Physician Practices

The study's findings have several practical implications for practices:

Pay particular attention to coding accuracy for preventive services. The distinction between preventive and diagnostic coding is the most common source of preventable denials for these services. Ensuring that preventive services are coded correctly at the point of service reduces denial exposure for all patients, and disproportionately benefits patients in higher-vulnerability populations.

Verify eligibility carefully and proactively for patients who may be at higher risk of coverage disruptions. Real-time eligibility verification before the encounter can identify coverage gaps before they produce denials.

When preventive care claims are denied, appeal with specific attention to the ACA's preventive service coverage requirements. Many preventive care denials result from coding or processing errors that can be overturned by demonstrating that the service meets the definition of a covered preventive service under the ACA.

The Equity Imperative

Denial disparities linked to social determinants of health are not just a billing problem — they are a health equity problem. Every denied preventive care claim is a potential barrier to early detection, disease prevention, and health maintenance. For physician practices committed to serving all patients equitably, addressing denial disparities is both a financial and a clinical imperative.

The data from this study provides the evidence base to advocate for policy changes, to challenge payer practices that disproportionately affect vulnerable populations, and to invest in denial management processes that ensure every patient's preventive care claims receive the attention they deserve.