To understand why health plans have networks at all — why the word "in-network" carries so much weight, why a wrong guess about a provider's status can cost a family thousands — you have to go back to a time when networks did not exist. For most of the twentieth century, American health insurance had no network. You got sick, you went to any doctor or hospital you liked, they sent a bill, and your insurance paid a share of it. That was the whole arrangement, and it was called indemnity, or fee-for-service, coverage. Every network model that dominates the market today — HMO, PPO, EPO, POS — was invented to solve the problems this model created. It is the baseline, and it is nearly extinct, and knowing how it worked and why it faded explains the entire logic of the plans that replaced it.
Where the model came from
Modern health insurance in the United States began, essentially, during the Great Depression, and it began with hospitals worried about getting paid. In 1929, an administrator named Justin Ford Kimball set up an arrangement at Baylor University Hospital in Dallas: schoolteachers could pay a small fixed sum each month — famously about fifty cents — and in return receive up to a set number of days of hospital care if they needed it. The idea spread. Hospitals across the country adopted similar prepaid plans to stabilize their revenue during a period when patients often could not pay, and these plans coalesced into a national network of nonprofit hospital service plans.
Physicians followed with their own version. Out of medical service bureaus that had served workers in the logging and mining camps of the Pacific Northwest, and formalized in California in 1939, came a parallel set of physician service plans, covering doctors' services rather than hospital stays. Commercial insurance companies, which had largely stayed out of health coverage, saw the nonprofit plans succeed and entered the market in force through the 1940s, especially once the wartime economy — and the tax treatment that made employer-provided coverage so attractive — turned employer-sponsored health benefits into a mass institution. By mid-century, the fee-for-service indemnity plan, offered by the nonprofit service plans and by commercial carriers alike, was simply what health insurance was.
How indemnity coverage actually worked
The mechanics were straightforward and, by today's standards, strikingly permissive. The plan did not tell you which providers to see. There was no network because the insurer had no contracts with providers — it had a contract with you, the policyholder, promising to indemnify you against a portion of your medical costs. You could see any physician, specialist, or hospital in the country, no referral required, no gatekeeper, no prior approval for most care.
When you received care, the provider billed their usual charge. The insurer paid according to a standard it called "usual, customary, and reasonable" — the UCR amount, roughly what providers in your area typically charged for that service. You were responsible for a deductible before coverage kicked in and then a share of the cost after, classically a coinsurance split like the insurer paying 80 percent and you paying 20 percent up to some limit. If a provider charged more than the UCR amount, you could be left owing the difference. But the defining feature was freedom: the patient chose, and the insurer paid its share of whatever the patient chose.
That freedom is exactly why the model became unsustainable, and understanding the failure is the key to everything that came after.
Why it collapsed: the incentive problem
Fee-for-service contains an incentive that, over time, proved corrosive. Providers were paid per service — every test, every visit, every procedure generated revenue — and neither the provider nor the patient had much reason to weigh whether a given service was necessary or whether it was priced reasonably. The insurer paid its share regardless. When someone else pays most of the bill and the provider earns more by doing more, the volume of services tends to climb, and so does the price of each one.
Through the 1960s and 1970s, American health care costs rose relentlessly, and the fee-for-service structure was widely blamed as a driver. There was no mechanism inside an indemnity plan to control utilization or negotiate prices; the insurer was a passive payer, absorbing whatever the system generated and passing the cost along in premiums. Employers, who were footing most of the bill, grew alarmed. Policymakers looked for alternatives. And the alternative that emerged was radical: what if the insurer stopped being a passive payer and started actively managing care — contracting with a defined set of providers, negotiating prices, and steering patients toward them? That idea is managed care, and every network model is a form of it. The network is the tool insurers built to fix the thing fee-for-service could not.
A necessary distinction: traditional indemnity versus modern "fixed indemnity"
There is a point of genuine confusion here that matters, and getting it wrong has real consequences. The traditional indemnity plans described above were comprehensive major medical coverage — they were the primary insurance, covering a broad range of care subject to deductibles and coinsurance. That kind of comprehensive indemnity plan is almost gone from the market today.
What still exists, and what people sometimes also call "indemnity," is a very different product: the modern fixed indemnity plan. A fixed indemnity plan pays a fixed cash amount tied to an event — a set dollar figure per hospital day, per doctor visit, per procedure — rather than paying a percentage of the actual bill. Crucially, fixed indemnity plans are classified as excepted benefits under federal law. They are not comprehensive coverage, they are not required to cover the essential health benefits, they generally do not have to cover pre-existing conditions, and they do not qualify as minimum essential coverage under the Affordable Care Act. They can be a useful supplement — cash to help offset costs a primary plan doesn't cover, or a stopgap — but they are not a substitute for comprehensive medical insurance, and they should never be mistaken for one. When this series and this site refer to fixed indemnity products, that limited, supplemental role is what is meant. The traditional, comprehensive fee-for-service indemnity plan that this article is mainly about is a historical model, not something a shopper is likely to buy today as primary coverage.
Where any of this survives, and what replaced it
Comprehensive indemnity coverage lingers only in narrow corners — some Medicare supplement arrangements operate on indemnity-like principles, certain niche and legacy plans persist, and the fixed-indemnity excepted-benefit products described above occupy a supplemental niche. But as a mainstream way to insure your health, the network-free indemnity plan is finished. The freedom it offered — see anyone, no referrals, no network to check — came at a cost the system could not sustain, and the managed-care models built to control that cost are now the market.
That trade sits at the center of every plan choice a shopper makes today. The indemnity plan maximized freedom and had no answer for cost. An HMO maximizes cost control and constrains freedom sharply. PPOs, EPOs, and POS plans arrange themselves at points in between, each one making a different bargain between how freely you can choose your providers and how much the plan does to hold down the price. Reading the rest of this series is, in effect, watching the health-insurance market try one arrangement after another to recover some of what indemnity offered without reviving the runaway costs that killed it.
The honest takeaway
The indemnity, fee-for-service plan is worth understanding not because you will buy one, but because it is the origin story that makes every other plan type legible. Networks, gatekeepers, referrals, in-network and out-of-network cost-sharing — none of these are arbitrary complications. They are all responses to the specific failure of a model that let patients see anyone and let providers charge for everything with no one minding the total. When you weigh an HMO against a PPO and feel the tension between freedom and cost, you are feeling the exact problem the entire twentieth-century system ran into. The plans in the rest of this series are the answers the market came up with, and the fixed-indemnity products that survive today are a limited supplement, not a return to the comprehensive coverage the word "indemnity" once meant.
Putting the label to work
Network type is one of the two labels that describe every plan you’ll shop — the other is the coverage category itself. If you’re comparing real plans, start with our health coverage guide or the ACA marketplace page, and a licensed agent can pull the actual networks in your ZIP code and check your doctors against them — free, in plain English, with no obligation.
This is general educational information, not legal, medical, tax, or benefits advice. Historical detail and the regulatory framework are accurate as of publication; IRS-set figures are indexed and change annually. Confirm current rules and plan specifics for your state and situation with a licensed advisor. Written by Matthew T. Giberti (NPN 20698856). Effective date: July 8, 2026.