Part 2: The Structures That Connect Providers
CINs, IDNs, IPAs, PHOs, MSOs, and Franchise Models
If Part 1 was about how individual physicians organize themselves, Part 2 is about how they connect into something bigger.
The challenge is simple: a solo dermatologist can’t negotiate with UnitedHealthcare. A five-physician primary care group can’t build the data infrastructure needed for value-based contracts. A community hospital can’t offer the full continuum of care a patient needs after a stroke.
So providers affiliate. They join networks. They merge. They form joint ventures. They hire management companies.
The six models in this section represent the spectrum from loose affiliation to full corporate integration:
Clinically Integrated Network (CIN) — Independent providers who formally agree to share data, follow common protocols, and report quality together. This lets them negotiate collectively with insurers without violating antitrust law. Think of it as a club with rules, not a corporation.
Integrated Delivery Network (IDN) — One company that owns everything: hospitals, physician groups, ambulatory centers, post-acute facilities, sometimes even an insurance plan. Kaiser Permanente is the textbook example.
Independent Practice Association (IPA) — An association of independent practices that contract together with health plans. Big in California. Each doctor keeps their own practice; the IPA is just the contracting vehicle.
Physician-Hospital Organization (PHO) — A joint venture between a hospital and its doctors for managed-care contracting. Popular in the 1990s. Many evolved into CINs or ACOs.
Management Services Organization (MSO) — A company that handles all the business operations (billing, HR, IT, compliance) for physician practices while the doctors keep clinical ownership. This is how private equity invests in healthcare without technically employing physicians.
Affiliation / Franchise / Licensing Model — An independent hospital affiliates with a brand-name system (like the Mayo Clinic Care Network) to get access to clinical protocols and brand recognition without being acquired.
The Integration Spectrum
The key concept is the spectrum: on the left, you have fully independent physicians with no organizational ties. On the right, you have a fully integrated system that owns everything. Most of American healthcare sits somewhere in the messy middle.
Each step toward integration trades autonomy for coordination. That tradeoff is the central tension in every model we’ll cover.