A network is simply the set of doctors, hospitals, pharmacies and other providers a plan has contracted with. Because the plan negotiated prices with them, it charges you less when you use them. "In-network" and "out-of-network" are not statements about quality. They are statements about contracts.

That distinction matters because networks are where a plan that looks inexpensive can become expensive, and where a plan that looks restrictive can turn out to fit your life perfectly. It depends entirely on who you see.

The plan types, in terms of what they let you do

Plan letters describe network behaviour more than anything else.

  • An HMO typically covers care only from in-network providers, except in an emergency, and often requires you to choose a primary care doctor and obtain referrals for specialists.
  • A PPO typically covers both in-network and out-of-network care, but at a higher share of the cost when you go out of network, and usually without requiring referrals.
  • Some plans sit between these, such as an HMO that allows certain out-of-network care at a higher cost.
  • Original Medicare has no network in this sense: any provider that accepts Medicare can generally see you.

None of these is better in the abstract. A tight network is a real cost only if it excludes someone you need.

How to check a network properly

Plan directories are the starting point, not the answer. They are updated on a lag, they list practices that may not be accepting new patients, and they sometimes list a provider at one location when they practise at another. A thorough check looks like this:

  • Look up each doctor by name in the plan's directory for the coming year, not the current one.
  • Call the practice, name the plan precisely, including the plan name and type, and ask whether they are in network for that plan next year and whether they are accepting patients with it.
  • Check the hospitals too, not only the doctors. A doctor can be in network at a hospital that is not.
  • Check the laboratory and imaging providers your doctor refers to. Out-of-network labs are a common surprise bill.
  • If you take prescriptions, check that your pharmacy is in network, and whether it is treated as preferred, since the difference is usually a difference in price.
  • Write down who you spoke to and when. Directories change, and your own record is useful if a claim is later processed as out-of-network.

Referrals and prior authorization are different things

These two get conflated constantly, and they fail in different ways.

A referral is permission to see another provider, usually from your primary care doctor. It is a routing requirement. If your plan requires one and you skip it, the visit may not be covered even though the specialist is in network.

Prior authorization is the plan agreeing in advance to pay for a specific service, drug or procedure. It is a coverage requirement, and it applies regardless of who is referring. It can take time and it can be denied, which is why it is worth knowing which of your routine services require it before you need them urgently.

Both can be appealed when they go wrong. Your plan must tell you how, and the steps are set out in its coverage documents. The practical advice is to start the process early and keep the paperwork.

What changes, and when

Networks are not permanent. A contract between a plan and a hospital system can end, and providers join and leave throughout the year. Plans describe network changes for the coming year in the notice they mail each autumn, but mid-year changes happen too, and the plan is required to notify affected members.

If a provider you depend on leaves the network, ask the plan two questions: whether any continuity-of-care arrangement applies to a course of treatment already underway, and whether the change qualifies you to switch plans outside the usual windows. The answers depend on the circumstances, and getting them in writing is worth the effort.

Budget Bliss can tell you how to check a network and can alert you when a plan you hold changes its costs, network or drug list, which is one of the four things our text alerts cover. We are not a licensed insurance agency and cannot verify a network on your behalf, recommend a plan, or submit an application. A licensed agent or your State Health Insurance Assistance Program can help with the plan-specific work.

The underlying idea is worth holding on to: the network is not fine print attached to the coverage. For most people it is the coverage, because it decides who can treat you at the price you were promised.

Dates, amounts and plan rules change, and the version that applies to you depends on where you live and which plan you hold. Confirm anything time-sensitive against Medicare.gov, your plan's own documents, or your State Health Insurance Assistance Program before you act on it.