Medicare’s New Peer Support Codes Face Early Hurdles, Study Finds

A quiet but consequential experiment in American mental health care is running into friction at the point of implementation. In 2024, Medicare took a step that advocates had long sought: it began allowing physicians to bill for services delivered by certified peer-support specialists through a new set of reimbursement codes known as principal illness navigation peer-support, or PIN-PS. The change promised to bring people with lived experience of behavioral health conditions into the formal machinery of Medicare-funded care. Yet a new qualitative study published in The Annals of Family Medicine suggests that the pathway from policy to practice is far from smooth, with knowledge gaps, billing complexity, and workflow uncertainty standing between the codes on paper and meaningful integration into clinical care.

The stakes of this question are substantial. According to the study’s framing, 21.8 percent of adults in the United States receive behavioral health treatment in a given year, a figure that underscores how many people stand to be affected by changes in how supportive services are financed. Peer support, in which trained specialists who have navigated their own mental health or substance use challenges help others through recovery, has accumulated a considerable evidence base over recent decades. What has been missing, however, is a sustainable mechanism for paying for these services within the largest public health insurance program for older adults and people with disabilities. The PIN-PS codes were designed to supply exactly that mechanism.

To understand how the new codes are actually landing in the field, researchers led by corresponding author Karen L. Fortuna, PhD, LICSW, of The Dartmouth Institute for Health Policy and Clinical Practice at the Geisel School of Medicine at Dartmouth, conducted an interview study with 20 participants. The group was deliberately broad, encompassing physicians, certified peer support specialists and their leaders, policy professionals, payer representatives, and leaders of behavioral health organizations. This cross-section of stakeholders allowed the team to capture system-level insights rather than the perspective of any single professional group, examining both the barriers and the facilitators that shape early adoption of Medicare-funded peer support.

The barriers the researchers identified cluster around a central problem: unfamiliarity. Participants reported limited knowledge of the Medicare navigation codes themselves, meaning that many clinicians and organizations simply did not know the reimbursement pathway existed or how it worked. Skepticism about the impact of peer support compounded this knowledge gap, with some stakeholders uncertain whether the services would deliver measurable benefit. Even among those inclined to adopt the codes, practical questions loomed large, including how to integrate peer support into existing clinical workflows, limited familiarity with billing requirements, and uncertainty about how to schedule and document PIN-PS encounters in a way that would satisfy Medicare’s rules.

Beyond these foundational uncertainties, the study documented a second tier of structural obstacles. Administrative and billing complexity emerged as a significant deterrent, reflecting the broader reality that Medicare reimbursement carries documentation and compliance demands that smaller organizations and solo peer specialists may struggle to meet. Medicare cost-sharing requirements added another layer of difficulty, since patient financial responsibility can complicate both service delivery and revenue predictability. Constraints in reimbursable service time further narrowed the window in which peer support could be delivered profitably, raising concerns that the codes might only support a compressed version of the work peer specialists actually do.

These findings matter because they illuminate a familiar pattern in health policy: coverage on paper does not automatically translate into services on the ground. When Medicare introduces new billing codes, the intended beneficiaries can only access them if clinicians know the codes exist, understand how to bill them, and can fit the services into workflows that are already stretched thin. The Dartmouth-led study suggests that each of these links in the chain is currently weak. A peer-support provision that remains unused because of administrative friction would fail to deliver the access benefits that motivated its creation, regardless of its theoretical promise.

The study was not uniformly pessimistic. Participants also identified facilitators that could drive adoption, most notably the belief that the codes could expand access to behavioral health care and reduce inappropriate hospitalizations. These perceived benefits align with longstanding arguments for peer support: that specialists with lived experience can engage people who might otherwise disengage from care, provide outreach and navigation between clinical visits, and intervene early in crises that might otherwise escalate to emergency departments or inpatient psychiatric admission. If those outcomes materialize, they could offset program costs and build the case for broader adoption among skeptical clinicians and payers.

The publication of the study in The Annals of Family Medicine, the peer-reviewed journal of the American Academy of Family Physicians, places these findings squarely in front of the primary care audience most likely to encounter the codes in practice. Primary care practices increasingly serve as the front line for behavioral health, and physicians in these settings are the ones who would bill for and coordinate PIN-PS services. The authors suggest that the findings may inform ongoing implementation and policy refinement as Medicare-funded peer support continues to develop, a signal that the research is intended not merely to document problems but to guide the next round of adjustments by the Centers for Medicare and Medicaid Services and by the organizations attempting to use the codes.

The research itself reflects a growing methodological trend in implementation science: studying new reimbursement mechanisms early, through qualitative interviews with the stakeholders who must operationalize them, rather than waiting years for utilization data that may arrive too late to shape policy. By interviewing physicians, peer specialists, payers, and policy professionals simultaneously, the Dartmouth team captured the misalignments that occur when a policy designed at the federal level meets the realities of scheduling software, documentation templates, and billing staff training. Each stakeholder group experienced different facets of the same barrier, which helps explain why a well-intentioned coverage change can stall even when no single actor opposes it.

What happens next will depend on whether the identified barriers can be addressed through targeted education, simplified billing guidance, and workflow support for the practices and organizations considering PIN-PS adoption. The study’s central contribution is a map of where the friction lies: in knowledge, in skepticism, in workflow design, and in the administrative and financial architecture surrounding the codes. As Medicare-funded peer support matures, the experience of these early implementers will likely determine whether the nation’s largest insurer can successfully fold lived-experience expertise into its funded benefit structure, a development that could reshape how millions of Americans access behavioral health support in the years ahead.

Subject of Research: Implementation barriers to Medicare-funded peer support services under the PIN-PS reimbursement codes

Article Title: Integrating peer support into Medicare-funded care faces implementation barriers

Article References: Integrating peer support into Medicare-funded care faces implementation barriers. (n.d.). Original publication

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Keywords: Medicare, peer support, behavioral health, PIN-PS codes, implementation science, reimbursement, primary care, mental health policy, qualitative research, Annals of Family Medicine, health care access, billing complexity