The Medicaid ‘Ghost Doctor’ Problem Explained (Jane Zhu)

Why It Matters

Ghost physicians inflate perceived Medicaid access, leading to unmet patient needs; accurate measurement and targeted incentives are essential to improve care availability and program efficiency.

Key Takeaways

• 28% of Medicaid-enrolled physicians saw zero patients in 2021.
• Psychiatrists have highest ghost rate, with 43% seeing no patients.
• Enrollment figures overstate actual access; claims data reveal gaps.
• CMS moving toward patient‑facing metrics and secret‑shopper audits.
• Targeted payment incentives could engage core providers and reduce ghosting.

Summary

The podcast examines a new Health Affairs study led by Dr. Jane Zhu that uncovers a hidden "ghost doctor" problem in Medicaid. While 70‑90% of physicians across specialties are formally enrolled as Medicaid providers, a substantial share never treat Medicaid beneficiaries. In 2021, roughly 28% of enrolled physicians saw zero Medicaid patients, and the phenomenon is most pronounced among psychiatrists, where 43% were ghost physicians and the median psychiatrist treated only three Medicaid patients.

The researchers compared state enrollment rosters with national Medicaid claims to distinguish nominal participation from meaningful engagement. They categorized physicians into ghost (0 patients), peripheral (1‑10), standard (11‑150), and core (>150) groups, finding that care is highly concentrated among a core 30% of providers. The study highlights structural reasons—such as employment contracts, capacity constraints, and outdated monitoring systems—that allow physicians to appear on provider lists without actually offering services.

Dr. Zhu emphasizes the patient‑facing consequences: Medicaid enrollees endure repeated calls, long wait lists, and psychological stress when trying to secure appointments with listed providers who cannot see them. She notes that CMS is beginning to address these gaps by incorporating maximum appointment wait times, secret‑shopper audits, and other patient‑centered metrics into compliance monitoring, marking a shift from reliance on static provider rosters.

The findings suggest that policymakers should move beyond enrollment counts toward incentives that activate latent capacity. Targeted payment reforms, streamlined billing, and support for the core group of high‑volume Medicaid physicians could improve access, especially in mental health, while secret‑shopper verification can ensure that listed providers truly serve Medicaid patients.

Original Description

Health Affairs' Rob Lott interviews Jane Zhu of Oregon Health & Science University about her recent paper exploring how many physicians enrolled in Medicaid see few or no Medicaid beneficiaries as patients, highlighting a greater need for targeted policies to boost participation and improve access.

This episode breaks down new research showing that many doctors enrolled in Medicaid don’t actually see Medicaid patients—especially in psychiatry—and explains what this means for access and how policy changes could help.

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