How to Write a Network Adequacy Letter a Plan Will Read

Most letters that providers send after a closed panel say some version of "I am an experienced clinician and my community needs me." They are sincere, and they rarely work, because they ask the plan to make an exception without giving it a reason it recognizes. A network adequacy letter is different. It speaks the plan's own compliance language: the standard its regulator holds it to, the place and specialty where it falls short, and the evidence that adding you closes the gap.

White Glove Credentialing's post on closed panels and how to appeal explains why concrete gaps beat general claims. What follows is the structure of the letter itself.

Which standard is the plan actually measured against?

Start here, because the right standard depends on the product, and a letter that cites the wrong one signals that the writer does not know the rules.

Medicare Advantage

CMS sets maximum time and distance standards and minimum provider counts by county type for 29 provider specialty types and a list of facility types (42 CFR 422.116). In large metro and metro counties, at least 90 percent of beneficiaries must have at least one provider of each type within the published limits; in micro, rural and counties with extreme access considerations, at least 85 percent (422.116(d)(4)). Plans must also meet appointment wait-time standards for primary care and behavioral health: within 7 business days for services that are not urgent or emergency but need medical attention, and within 30 business days for routine and preventive care (42 CFR 422.112(a)(6)(i)). See time and distance standards.

Medicaid managed care

Each state sets quantitative network adequacy standards for primary care, OB/GYN, adult and pediatric mental health and substance use disorder, specialists, hospitals and pharmacy (42 CFR 438.68(b)), and must publish them (438.68(g)). In setting them, the state must consider "the numbers of network providers who are not accepting new Medicaid patients" and "the geographic location of network providers and Medicaid enrollees, considering distance, travel time, the means of transportation ordinarily used by Medicaid enrollees" (438.68(c)(1)(v) and (vi)). Appointment wait-time limits arrive for rating periods beginning on or after July 9, 2027. See Medicaid's new wait-time standards.

Insured commercial plans

State law. Texas, for example, sets maximum travel times and distances for PPO and EPO networks by specialty and county type in its insurance code (Tex. Ins. Code 1301.00553) and appointment wait limits of three weeks for routine medical care and two weeks for routine behavioral health care (1301.00555). Pennsylvania requires managed care plans to give at least 90 percent of enrollees in each county access within 20 miles or 30 minutes in metropolitan statistical area counties and 45 miles or 60 minutes elsewhere (28 Pa. Code 9.679(d)). Check your state on the network access laws index.

How should the letter be built?

A letter a network manager will read is short, specific and organized like a compliance memo. We use six parts.

1. Who you are, in one paragraph. Name, credentials, NPI, specialty, practice address and county, languages, hours, whether you are accepting new patients, and the products you are asking to join.
2. The decision you are responding to. The date and reference of the plan's letter, and the plan's stated reason in its own words.
3. The standard. The rule that applies to this product in this place, cited precisely: the Medicare Advantage time and distance standard for your specialty and county type, the state's published Medicaid standard, or the state insurance code provision.
4. The gap. What your evidence shows: listed providers who are not accepting new patients, wait times for a first appointment, distances from the ZIP codes your patients come from to the nearest in-network provider who will actually see them, and any language or subspecialty the network lacks. See documenting an access gap.
5. How you close it. Your location relative to the gap, your capacity (new patient openings per week), and anything the network does not have.
6. The request. One clear ask: an exception to the closed panel and an application packet, a review by the person responsible for network adequacy in that market, or, if the plan disagrees, the data it relied on in finding the network adequate.

What evidence makes the gap credible?

Evidence the plan can check. A table of the plan's own directory listings for your specialty within the relevant distance, with the date each office was called and whether it offered a new-patient appointment and when, is far stronger than a general statement that "nobody is taking patients." Directory entries are supposed to say whether a provider is accepting new patients (Medicaid plans under 42 CFR 438.10(h)(1)(vi); Texas PPOs under Tex. Ins. Code 1301.1591(a)), so a mismatch between the listing and the phone call is useful in itself.

Two regulatory details are worth using when they apply:

• Medicaid exceptions. When a state lets a Medicaid plan off a network standard, the exception standard must be based on "the number of providers in that specialty practicing in the" service area and, for rating periods beginning on or after July 9, 2026, must include "consideration of the payment rates offered" by the plan (438.68(d)(1) and (h)). A willing provider who was turned away is directly relevant to whether an exception is justified.
• Medicare Advantage exceptions. A plan may ask CMS for an exception when providers "are not available" in a county; CMS considers whether "current access to providers and facilities is different from" its own reference files (422.116(f)). A provider who is available and was refused is evidence on that point. See Medicare Advantage adequacy exceptions.

In Texas, the waiver hearing statute names the evidence the commissioner considers, including the number of providers of each type in the county and "whether the insurer made a good faith effort to contract with" them (Tex. Ins. Code 1301.00565(d)(1)). A provider's letter and the plan's refusal belong in that record. See Texas waiver hearings.

What should stay out of the letter?

• Patient names and health details. Describe demand in counts and dates: "14 new-patient inquiries from members of this plan in August." If you want to include anything that identifies a patient, ask a healthcare attorney about authorization first.
• Legal threats. A threat moves the letter from network management to the legal department, where the answer is usually slower and narrower. If you are considering legal action, that is a conversation with your own attorney, not a paragraph in this letter.
• Claims that the panel is illegal. In most cases it is not. Medicare Advantage and Medicaid managed care plans may refuse providers beyond the number they need (42 CFR 422.205(b)(1); 438.12(b)(1)). The argument is that the network is not adequate here, not that the plan had no right to decide.
• Generalities. "Quality care," "patient-centered" and "community need" without numbers add length and nothing else.

Who should receive it?

Network management or provider contracting for the market, not the general provider services line. If the plan's letter names a person or department, use it. A copy to the plan's medical director for the region is reasonable for behavioral health and specialty gaps. Some plans route questions about network adequacy through a compliance department; if the plan's provider manual names one, include it. Regulators come later, if at all, and a regulator complaint is far stronger when it can attach a clear letter the plan did not answer. See complaining to the state insurance department.

How long should it be?

Two pages of letter, plus exhibits. The table of calls, a map of distances and a copy of the plan's own letter carry the weight. A network manager should be able to read the first page in two minutes and know the specialty, the county, the standard, the gap and the request.

What happens after you send it?

Possible answers include an application packet or exception, a request for more information, a referral to a different product (Medicaid instead of commercial, for example), a statement that the plan disagrees with your data, or silence. Calendar a follow-up for 30 days. If the plan says it disagrees, ask for the data it used. If it says nothing, the letter and your proof of sending become exhibits for the next step.

Can we write it for you?

A Payer Network Dispute ($799 per payer, or $1,999 for three payers) includes the adequacy research for your specialty, county and product, the directory and phone audit, the distance analysis and the letter itself, prepared for your signature. You review it, sign it and send it; we track the response and prepare the follow-ups. If a plan offers a contract or approves your credentialing, a flat $1,500 win fee applies. See pricing. We are not a law firm, and nothing in the letter is legal advice; questions about your legal rights go to a healthcare attorney.