The first five providers to contract in a new county.

Every county build starts with a blank slate and a list. The list is usually sorted by specialty type, or alphabetically, or by whoever the contracting team happens to call first. It should be sorted by adequacy impact — which providers unlock the most progress, in what order, and why. The sequence is the strategy.

We have run county builds where the team started with specialists because they were easier to reach. The PCPs came later, the behavioral health providers were almost an afterthought, and at week ten they were scrambling to fill adequacy gaps that should have been addressed in week two. We have run the same geography the right way and finished four weeks earlier.

The sequence below is the result of doing this in enough counties to understand what the adequacy clock actually looks like when you get the order right.

The five, in order

• 1. The anchor PCP group. Primary care physicians are the adequacy foundation. CMS and most state DOI standards measure PCP-to-enrollee ratios as the primary adequacy test. Starting here is not optional. Find the largest independent PCP group in the county — not a health system-employed PCP group, whose contract may require facility-level negotiation with the health system before any individual provider can be contracted — and get them signed first. An independent group can make a decision in two to three weeks. A health system PCP contract can take three months. Get the independent group anchored, and everything else builds from that. The credentialing clock for those PCPs starts the moment the contract is signed, so early execution means early activation.
• 2. The highest-volume specialist.Pull your claims data for the county — or proxy with statewide utilization data if you don't have county-level claims yet. Which specialty has the most encounters in this geography? For most Medicare Advantage populations, it is cardiology. For many commercial and Medicaid populations, it is orthopedics. Getting the dominant specialist group signed early does two things: it sends a market signal (other specialists notice when the go-to cardiologist is in your network), and it starts the adequacy clock for that specialty type, which is often among the harder thresholds to meet in rural and suburban markets. Don't wait until PCPs are fully credentialed to start specialist outreach.
• 3. Behavioral health. Start outreach on behavioral health in week one of the build — not week four or five, not after you have PCPs and specialists signed. Behavioral health takes the longest to credential. NCQA-compliant behavioral health credentialing requires additional primary source verification steps — board certification verification for psychiatrists, licensure verification for licensed clinical social workers and psychologists across multiple licensing boards — that add weeks to the standard timeline. In most markets, behavioral health providers are also more cautious about joining new networks and may require more outreach touches before agreeing to contract. If you start behavioral health late, you will not have behavioral health adequacy at go-live. That is a near-certainty, not a risk.
• 4. The hospital or facility.Inpatient and emergency access are measured separately from outpatient adequacy. You need at least one in-network hospital facility in each county for most line-of-business requirements. Health system negotiations are slow — they involve multiple stakeholders, legal review, and sometimes board approvals. Start them early, running parallel to the outpatient build, not sequentially after it. Getting the facility contract signed before you need it for adequacy purposes is a management discipline. Getting it signed while you're racing a submission deadline is a negotiating position no plan wants to be in.
• 5. The provider your competitors are fighting over.In every county there are one or two providers everyone wants. The large hospitalist group that covers the dominant hospital. The cardiologist whose patient panel is two-thirds of the county's cardiac patients. The only orthopedic practice within 40 miles. These providers know their leverage. They have heard the pitch from every plan in the market. They are slow to commit and they will test your rate flexibility. Price that into the negotiation budget before you start. Get them signed and move on. A network without the dominant provider in a market is a harder sell to employers, members, and referral relationships — and a harder story to tell CMS when your adequacy analysis shows the one provider everyone uses is not in your network.

The first five providers in a county set the adequacy clock. Get the sequence wrong and you're working twice as hard to hit the same date.

The list is the plan. Sort it by impact, work it in sequence, and track the adequacy clock for each provider type from day one — not from the day you finish contracting. Every day a provider spends in the credentialing queue after contract execution is a day on the adequacy clock. The sooner you get the right providers signed, the sooner that clock starts running in your favor.