1115 waiver

What a Section 1115 waiver is

A Section 1115 waiver is a federal Medicaid demonstration authority that lets states try new program designs that normally would not be allowed under standard Medicaid law. The Centers for Medicare & Medicaid Services (CMS) approves these waivers and issues Special Terms and Conditions that define who is covered, which services are included, and what data the state must report.

Waivers typically run for several years and can significantly change eligibility, benefits, delivery systems, and payment models. Many states use 1115 waivers to redesign behavioral health, substance use disorder (SUD), and crisis systems, including paying for some services in Institutions for Mental Diseases (IMDs) that are otherwise excluded.

Why 1115 waivers matter operationally

For revenue cycle, a 1115 waiver means Medicaid in that state does not match the standard handbook. Covered services, place of service rules, lengths of stay, and prior authorization requirements can be different for waiver populations. If your team applies generic Medicaid rules instead of the waiver rules, you can rack up serial CO-50, CO-96, and CO-197 denials.

Waivers also interact with Medicaid managed care. The state may carve in or carve out behavioral health under the waiver, assign specific managed care organizations (MCOs) to certain regions or populations, or pay different rates or case rates for waiver services. Contracting, credentialing, and benefits verification all have to track which members are in a waiver program and which coverage and billing rules apply.

How a 1115 waiver is used and how to read it

CMS publishes each state's 1115 waiver approval with Special Terms and Conditions. The details that matter for RCM usually show up in:

• Eligibility and enrollment sections that define which members are in the waiver population
• Benefits and service definitions that spell out covered services, limits, and settings
• Delivery system and payment sections that describe managed care, fee for service, value based models, and rate structures
• IMD or SUD demonstration sections that describe residential and withdrawal management coverage

You rarely need to read the full legal text, but you do need to map the waiver to payer manuals and contracts. Focus on: what changed about who is eligible, which behavioral health services are newly covered or excluded, what new prior authorization or concurrent review rules exist, and any special coding or reporting requirements tied to the waiver.

• Assuming all Medicaid plans follow standard IMD rules and then billing residential SUD days the state only covers under its 1115 demonstration, which leads to repeated CO-50 or CO-96 denials that look like payer errors instead of waiver misreads.
• Not separating waiver and non waiver members when setting up authorization rules, so your system either under authors long residential or PHP episodes for waiver members or over authors non waiver members and eats CO-197 denials for days past the allowed limits.
• Ignoring 1115 renewal or amendment dates, so your team keeps billing an old rev code or per diem structure after the state has shifted that level of care to a case rate or bundled payment under the new waiver terms.
• Missing special documentation or diagnosis requirements in the waiver SUD or mental health sections, such as needing ASAM level documentation for residential SUD, which later results in medical necessity and CO-50 denials during post payment review.
• Treating managed care behavioral health plans as if they all follow the same rules inside a waiver state, instead of configuring each MCO's specific implementation of the 1115 terms, which leads to payer specific carve out surprises and inconsistent payment for the same service.

Behavioral health systems are often the main focus of 1115 waivers. States use waivers to fund residential SUD treatment, crisis services, and withdrawal management that would otherwise be blocked by the IMD exclusion or not clearly covered in the state plan. For a treatment center, this can mean new covered levels of care, new rates, and new prior authorization requirements that do not look like traditional Medicaid.

Many states also restructure behavioral health delivery under 1115 demonstrations by carving behavioral health into specialized managed care plans or consolidating multiple legacy carve outs. You may have one MCO for waiver SUD services and another for standard mental health, or a single behavioral health plan that only applies to certain 1115 populations. If your front desk and verification workflows are not keyed to these distinctions, you end up treating a waiver SUD stay as non covered or out of network when it is actually covered with very specific rules.

Long episode per diem services like residential treatment, PHP, and IOP are especially exposed under waivers. The waiver terms can change maximum covered days, require tighter concurrent review, or define different rules for step down levels of care inside the same episode. If scheduling, utilization review, and billing teams are not all reading from the same 1115 playbook, you see clean claims for early days and then a wall of CO-197 and CO-50 denials once the stay crosses a waiver limit.

Telehealth and crisis services are also common 1115 features. A waiver may expand telebehavioral health in rural areas or pay for mobile crisis response with specific modifiers and revenue codes. If you code these services using generic Medicaid telehealth rules and ignore the waiver specific requirements, you risk avoidable rejections and underpayment in programs that are often central to your mission.

AI can help with 1115 waivers by reading the waiver documents, state bulletins, and MCO manuals, then extracting the operational rules that matter for RCM. An agent can map which services, places of service, and levels of care are covered under the waiver, flag changes by effective date, and surface them right in your benefits verification and authorization workflows.

Supabill uses this kind of agent to hold state and payer specific rules so your team sees waiver related coverage notes when you run benefits, request prior authorization, or scrub claims. A denials agent can read every 835, spot clusters of CO-50, CO-96, and CO-197 denials tied to a specific state's 1115 program, and prompt a configuration or process fix instead of more resubmissions. The limit is that waiver language and state implementation can be detailed, so humans still need to interpret edge cases, manage peer to peer conversations, and negotiate with payers when the written rules and real world behavior do not line up.

Who approves a Section 1115 waiver and how long does it last?

CMS approves 1115 waivers and issues Special Terms and Conditions that govern the program. Most waivers run for several years, often five, and can be renewed or amended, so RCM teams need to track effective dates and changes over time.

How do 1115 waivers affect behavioral health coverage?

Many states use 1115 waivers to expand SUD and mental health coverage, including residential and withdrawal management services that are otherwise limited by the IMD exclusion. The waiver can change which levels of care are covered, how long stays can last, and what authorization and documentation are required.

Do all Medicaid members in a state fall under the 1115 waiver rules?

No. Waivers usually apply to specific populations, services, or regions. Eligibility and enrollment sections in the waiver, plus state and MCO materials, tell you which members are in the waiver group and which follow standard Medicaid rules.

Where should an RCM team look to understand 1115 billing rules?

Start with the state's 1115 Special Terms and Conditions, then look at state Medicaid provider manuals and MCO contracts or provider guides. Those downstream documents translate the waiver into concrete coverage, authorization, and billing rules you can operationalize.

Can a 1115 waiver change mid contract for a managed care plan?

Yes. States can amend waivers, or let them expire and replace them, which then flows into updated MCO contracts and manuals. Your team needs a way to watch for state and payer notices tied to waiver changes and update your RCM rules before claims start denying.

• Medicaid.gov