Notice of admission

What a notice of admission is

A notice of admission is a formal notice to the payer that a member has started an inpatient or facility-based episode of care. It usually contains core data only: member ID, dates of service, facility, attending provider, expected level of care, and sometimes a preliminary diagnosis.

Most payers treat the NOA as an administrative requirement that sits next to prior authorization. Prior authorization gets you conditional approval for the service. The NOA alerts the plan that the member actually showed up and the clock on that approved stay has started.

For some products (for example, Medicare home health and some Medicare Advantage plans), an NOA is an electronic transaction that must be filed to open the billing period. Commercial and Medicaid plans may use their own portal form, fax, or phone-based NOA process.

Why it matters operationally

If the NOA is late or never sent, the payer often treats the admission as "not notified," even if there was a prior authorization. That can lead to claim denials for all or part of the stay, reduced covered days, or non-payable outlier days at the front of the episode. In practice, this turns into write-offs or long appeals cycles and extra days in AR.

Timing rules are tight. Many payers expect an NOA within 24 to 72 hours of admission or by the next business day. When your intake, UR, and billing teams do not have a clear owner for the NOA, you end up with CO-197 "no auth/notification" denials on claims that otherwise look clean.

Operationally, an NOA also sets up utilization review workflows. It tells the payer's UM team which member to watch, what level of care to review, and when to schedule concurrent review. When that connection is missing, you see more clinical disputes later, including reduced authorized days or medical necessity denials.

How a notice of admission is used and read

Payers use the NOA to:

• Open or link a utilization management case for the episode
• Confirm that the admission fits within the member's benefits and network
• Start the authorized day count and track length of stay
• Decide when to request clinicals for concurrent review

On the provider side, your team should read the NOA confirmation to verify a few key items: the payer case number, the admission date the payer has on record, the linked prior authorization (if any), and any stated limits or warnings. If the plan shortens the start date or notes "notification received late," you can expect partial denials if you bill those early days.

Many payers do not send a rich document back. The only proof of NOA may be a portal screenshot, a fax confirmation, or a short acknowledgment. Your UR and billing teams should know where that proof lives and reference it in appeals when a claim is denied for missing or late notification.

• Assuming a prior authorization replaces the need for an NOA, which leads to CO-197 denials when the payer requires both the auth and a separate admission notification within 24 hours.
• Sending the NOA with the wrong admission date (for example, using the date of assessment instead of the date the member took a bed), so the payer cuts off coverage for the first day or two of a residential stay.
• Letting clinical or program staff call in the NOA without capturing a reference or case number, leaving billing with no proof when the payer later insists no notification was received.
• Only checking the medical plan for NOA rules in a carve-out plan, so the facility notifies the medical carrier but misses the separate behavioral-health NOA that the BH vendor requires.
• Relying on front-desk or intake to handle NOAs manually with no tracking, which leads to missing notifications over weekends and holidays and forces your team into retro-authorization or write-off conversations.

In behavioral health, NOAs are common for inpatient psych, residential treatment, withdrawal management, PHP, and sometimes IOP, especially with Medicaid MCOs and commercial plans that carve out behavioral health. Many of these programs bill on a per-diem basis, so a late NOA often means losing payment for one or more days at the front of the stay, not just an administrative slap on the wrist.

Carve-outs make this harder. A member can have medical benefits with one payer and behavioral benefits with another, and each can have its own NOA rule set. If your team only checks the medical ID card or portal, you can easily miss that the behavioral-health vendor needs its own admission notification and its own case number.

Long episodes and concurrent authorization add more risk. For residential or PHP/IOP, the NOA date is usually the anchor for the authorization span and future concurrent reviews. If the payer thinks the admission started two days later than it really did, they will apply continued-stay criteria against the wrong timeline and may deny "excess days" that were actually clinically appropriate. State Medicaid and MCO plans often have stricter timing for NOAs, especially for crisis stabilization or withdrawal management, and may not allow retroactive notifications at all.

Behavioral-health teams also deal with frequent transfers between levels of care. Some payers expect a fresh NOA when a member steps up or down (for example, from residential to PHP), even if the prior authorization is still in place. Missing that second NOA can split an otherwise continuous episode into paid and unpaid segments.

AI can help with notice of admission by watching admissions in real time and applying payer-specific rules to decide when and how an NOA is required. An agent can read the schedule, EHR admission records, and benefits data, then automatically generate tasks or draft NOA submissions that match each payer's timing and format rules, and flag edge cases like weekend admits or retro-eligibility.

Supabill's benefits-verification agent can capture plan notes about notification requirements up front and store them in a structured way, so your team is not hunting through PDFs or portals at the time of admission. A claims-scrubbing and denials agent can then check each facility claim against that stored data, confirm that an NOA was logged with a case number, and surface CO-197-type denials where notification is in question. Humans still need to handle phone-based notifications, negotiate exceptions with UM nurses, and decide how hard to push appeals when an NOA was truly missed.

Is a notice of admission the same as prior authorization?

No. Prior authorization is the payer's advance approval of a service, while a notice of admission is the real-time notification that the member has actually been admitted. Many plans require both and will deny for missing notification even when a prior authorization is on file.

Who is responsible for submitting the notice of admission?

Responsibility varies by organization, but most behavioral-health programs assign NOAs to utilization review or admissions staff, not to billers. What matters is that you have a clear owner, a backup for weekends and holidays, and a way for billing to see that the NOA was done and to find the payer's case number.

How soon after admission does the notice of admission need to be sent?

Most payers that require an NOA expect it within a short window, often within 24 to 72 hours or the next business day. Exact rules are payer and product specific, so your team should maintain a payer matrix or policy library and not assume the same timing across all plans.

What happens if the notice of admission is late or never sent?

Common outcomes include denial of the entire stay, denial of the first few days, or reclassification of the episode as out-of-network or non-authorized care. You can sometimes recover payment through retroactive authorization or appeal, but that costs staff time and often results in partial write-offs.

Does a notice of admission guarantee payment for the whole stay?

No. An NOA only satisfies the notification requirement and helps the payer start utilization review. Payment still depends on medical necessity, benefit limits, correct coding, and clean claims, and the payer can still deny days through concurrent review even when the NOA was on time.

• CMS, Medicare Managed Care Manual
• Medicaid.gov, Managed Care