No single entity allocates resources in the U.S. healthcare system. Instead, spending decisions are spread across federal and state governments, private insurers, employers, pharmacy middlemen, and hospitals, each operating with different rules and incentives. The result is a $5.3 trillion system (as of 2024) that consumes 18% of the country’s GDP, with no central authority deciding where the money goes.
The Federal Government: Medicare, Medicaid, and CMS
The Centers for Medicare and Medicaid Services (CMS) is the single largest allocator of healthcare dollars in the country, administering coverage for over 150 million Americans through Medicare (adults 65 and older, plus some younger people with disabilities) and Medicaid (lower-income individuals and families). The mechanics differ for each program.
For Medicaid, CMS and the states share costs through a matching system called federal financial participation. Each quarter, states submit budget estimates using a standardized form that projects their expected medical assistance payments and administrative costs. CMS reviews these projections, confirms the state has its share of funding available, and issues a grant award. The federal match rate varies by state, with poorer states receiving a higher percentage. A similar structure applies to the Children’s Health Insurance Program (CHIP), where states can receive enhanced matching funds for expanding coverage to children.
For Medicare, CMS sets the prices hospitals and doctors are paid, which shapes how resources flow across the entire system. Private insurers frequently base their own payment rates on Medicare’s, so CMS decisions ripple far beyond the government programs it directly manages.
How Hospitals Get Paid: The DRG System
Since 1983, Medicare has paid hospitals using a system called Diagnosis Related Groups (DRGs). Rather than reimbursing hospitals for every individual service they provide, DRGs assign each patient to a category based on their diagnosis, and the hospital receives a fixed payment for that category. A patient admitted for pneumonia generates one payment amount; a patient admitted for a hip replacement generates another.
The logic is straightforward: patients with similar conditions tend to require similar resources. By grouping patients this way and paying a flat rate per group, Medicare creates an incentive for hospitals to deliver care efficiently. If a hospital spends less than the DRG payment, it keeps the difference. If it spends more, it absorbs the loss. This system was first tested in New Jersey in the late 1970s before Congress adopted it nationally. Today, DRGs remain the foundation of hospital payment, and most private insurers use similar case-based models.
The practical effect is that DRGs shape staffing decisions, length of stay targets, and which services hospitals invest in. A hospital’s “case mix,” the blend of patient types it treats, directly determines its revenue, which in turn determines how it allocates beds, equipment, and personnel.
How Doctors Get Paid: Relative Value Units
Physician compensation under Medicare is built on a system called Relative Value Units (RVUs). Every medical service a doctor can bill for is assigned a numerical value based on three factors: the physician’s work (time, skill, and mental effort), the cost of running a practice (rent, staff, equipment), and malpractice insurance expenses.
Each of these three components is adjusted for geographic cost differences, then multiplied by a dollar conversion factor that CMS updates annually. The result is the payment amount for that specific service. A complex surgical procedure carries more RVUs than a routine office visit, so it pays more.
RVUs have become far more influential than Medicare alone. As physicians increasingly work within hospital systems and large medical groups, RVUs have become the standard measure of productivity used to calculate physician compensation across the industry. This means the relative values CMS assigns, which historically have favored procedures over office-based evaluation and management, shape how doctors spend their time and which specialties attract new physicians.
Private Insurers and the 80/20 Rule
Private health insurance covers the largest share of Americans, primarily through employer-sponsored plans. These insurers decide which doctors and hospitals are in their networks, what services require advance approval, and how much they’ll pay for each service. Their negotiations with hospitals and physician groups create a separate pricing structure that often pays significantly more than Medicare rates for the same services.
Federal law constrains how insurers spend premium dollars. Under the Affordable Care Act’s Medical Loss Ratio rule, insurers selling to individuals and small groups must spend at least 80% of premium revenue on actual healthcare and quality improvement. Insurers selling to large employers face an 85% threshold. The remaining portion covers administrative costs, marketing, and profit. If an insurer fails to meet these targets in a given year, it must issue rebates to policyholders.
This rule sets a ceiling on administrative spending and profit but doesn’t dictate how the clinical dollars are distributed. Those decisions fall to the insurer’s network design, payment negotiations, and utilization management tools.
Utilization Management: Gatekeeping at the Plan Level
Insurance plans, both public and private, use a set of techniques collectively called utilization management to control which services get approved and paid for. These tools are now embedded in virtually every health plan in the country and represent one of the most direct forms of resource allocation most patients encounter.
The most common tool is prior authorization, which requires a doctor to get approval from the insurer before performing certain procedures, prescribing certain medications, or admitting a patient to the hospital. For non-emergency hospital admissions, a nurse employed by the review organization evaluates whether the patient’s condition is severe enough to justify inpatient care and whether the planned length of stay is appropriate. Standardized clinical criteria guide these decisions.
Other tools include second-opinion requirements for elective surgeries and step therapy for medications, which requires patients to try less expensive treatments before the plan will cover a costlier alternative. Hospital precertification programs were a major factor in the 18.6% reduction in community hospital bed days between 1981 and 1988, illustrating how these techniques directly shift where resources go.
Pharmacy Benefit Managers and Drug Formularies
Prescription drug spending is largely shaped by pharmacy benefit managers (PBMs), companies that sit between insurers, pharmacies, and drug manufacturers. Most health plans contract with a PBM to manage their pharmacy benefits, and the PBM’s internal committee develops a master formulary: a tiered list of preferred and non-preferred medications.
When a doctor prescribes a drug that isn’t on the formulary, the PBM sends an electronic message to the dispensing pharmacist flagging it as non-preferred and suggesting an alternative. If the doctor believes the non-formulary drug is medically necessary, they can submit a request, but the PBM has protocols defining what evidence is required and the authority to approve or reject based on those criteria. PBMs also track physician prescribing patterns across their networks, giving them data to identify outliers and push prescribing toward lower-cost options.
The three largest PBMs process the vast majority of prescriptions in the United States, giving them enormous influence over which drugs patients actually receive and at what price.
State Governments: Regulating Supply Directly
States play a distinct role in resource allocation through laws that control where healthcare facilities can be built and what equipment they can purchase. Currently, 35 states and Washington, D.C., operate Certificate of Need (CON) programs. Under these laws, a hospital that wants to add beds, open a new surgery center, or purchase an expensive imaging machine must first prove to a state planning agency that the community needs it.
The original rationale was to prevent oversupply: too many hospitals competing for patients could drive up costs as each facility tried to fill its beds. Critics argue CON laws protect existing hospitals from competition and limit patient access, particularly in rural areas. Supporters maintain they prevent wasteful duplication of expensive services. Either way, CON programs represent one of the few mechanisms that directly controls the physical infrastructure of healthcare, deciding where MRI machines, operating rooms, and hospital beds exist in the first place.
Employers as the Quiet Allocators
Roughly half of Americans get health insurance through an employer, which makes employers a powerful but often overlooked force in resource allocation. Employers choose which insurance plans to offer, how much of the premium to cover, what deductible and copay levels employees face, and whether to include dental, vision, or mental health coverage. A company that selects a high-deductible plan with a narrow provider network is making a resource allocation decision that shapes how its employees access care.
Large employers sometimes bypass traditional insurers entirely through self-funded plans, where the company assumes the financial risk for its employees’ healthcare costs and hires an insurer only to administer claims. In these arrangements, the employer has even more direct control over benefit design, covered services, and cost-sharing structures. About 65% of covered workers at large firms are in self-funded plans, making employers one of the most consequential decision-makers in the system.