Home Health Notice of Admission (NOA): The 5-Day Rule, the Penalty, and How It Works

Every Medicare home health admission now begins with a single administrative filing: the Notice of Admission (NOA). Submit it on time and it’s invisible — just a routine claim that clears the way for payment. Submit it late, and it starts costing you money, potentially across every 30-day period in the admission.

This post explains what the NOA is, the 5-calendar-day window you have to file it, how the late-filing penalty is calculated, and where agencies consistently trip over the clock.

What the NOA replaced

Before January 1, 2022, home health agencies filed a Request for Anticipated Payment (RAP) at the start of each 30-day period. RAPs served as an advance payment mechanism — you filed at the top of a period, CMS sent a partial payment, and you trued it up with the final claim.

CMS eliminated the RAP and replaced it with the NOA as part of a broader effort to reduce improper billing and streamline the claims process. The key operational difference:

• Old system: A RAP at the beginning of every 30-day period.
• New system: One NOA per admission, filed once, covering the entire length of care for that patient.

Once submitted and accepted, the NOA stays on file for the admission. You don’t re-file it for subsequent periods — those periods are billed with a standard 30-day period claim (Type of Bill 329). The NOA is a one-time action, which simplifies ongoing billing but concentrates all the filing risk at intake.

The 5-day rule

The NOA must be submitted to and accepted by your A/B MAC (home health and hospice) within five calendar days of the start-of-care (SOC) date.

The SOC date is the date of the first billable skilled visit in the episode — the day a nurse or therapist first sees the patient under the home health plan of care. That date starts the clock. You have five calendar days from that date (not five business days) to have a submitted-and-accepted NOA on file. The SOC date itself counts as day zero — the clock runs over the five calendar days that follow — and the five days are calendar days, so weekends and holidays don’t extend them.

NOA mechanics: The NOA is submitted on Type of Bill 32A. It carries the patient’s name, Medicare number, admission date, provider information, and the HIPPS code for the first 30-day period. No payment is made on the NOA itself — it is purely a notice to Medicare that the patient is under home health care. Subsequent 30-day period claims are billed on TOB 329.

One NOA, one submission, for the entire admission. If the patient is discharged and later readmitted, a new NOA is required for the new admission.

(The HIPPS code on the NOA — built from your OASIS assessment and diagnosis coding — also determines what you’re paid for that first period. Getting it right matters. We covered the mechanics of accurate HIPPS coding in how automatic HIPPS coding protects your home health revenue.)

What happens when it’s late

If the NOA is not filed within five calendar days of the SOC date, Medicare reduces your payment by the following formula:

Reduction = (days from admission date to NOA submission date) ÷ 30 × the wage-adjusted 30-day period payment (including any outlier)

In plain terms: for each day that passes from admission to the day the NOA is accepted, you lose 1/30th of that period’s payment.

Worked example (illustrative — not a quoted rate): Suppose your 30-day period payment for a particular case is $2,000. If you file the NOA 10 days after the SOC date, the late penalty is 10 ÷ 30 × $2,000 = $667 deducted from that period’s payment. File it 20 days late and you lose $1,333 — two-thirds of the period. File it after the period ends and the entire period payment could be forfeited.

One late NOA can affect multiple periods. Because the NOA covers the entire admission, a single late submission can trigger the reduction formula across every subsequent 30-day period in that admission until the NOA is actually filed. In a multi-period admission, the financial exposure compounds quickly.

This is provider liability. The payment reduction comes out of the agency’s reimbursement. You cannot bill the Medicare beneficiary for the amount withheld due to a late NOA. The loss is entirely yours.

The exceptions

CMS recognizes four circumstances under which the late-filing penalty can be waived. Per guidance from the Medicare Administrative Contractors, those circumstances are:

1. Natural disaster or unusual event — Fires, floods, earthquakes, or other unusual events that inflict extensive damage to the HHA’s ability to operate.
2. CMS or MAC systems issue — An event that produces a data filing problem due to a CMS or A/B MAC (HH+H) systems issue that is beyond the control of the HHA.
3. Newly certified HHA — A newly Medicare-certified HHA that is notified of its certification after the Medicare certification date, or which is awaiting its user ID from its A/B MAC (HH+H).
4. Other circumstances beyond the HHA’s control — Other circumstances determined by the A/B MAC (HH+H) or CMS to be beyond the control of the HHA.

To request an exception, the HHA appends modifier KX to the HIPPS code on the 0023 revenue code line of the claim and includes a sufficient explanation in the Remarks section to allow the MAC to research the situation.

Note what is not on this list: staffing shortages, software problems the agency could have anticipated, or a busy intake queue. The bar for a waiver is genuine external disruption. Plan your workflows assuming exceptions will rarely apply.

Where agencies trip up

The five-calendar-day window looks generous until you map the workflow against it. The most common failure points:

Eligibility not confirmed at intake. If a patient isn’t verified as Medicare-eligible before the first visit, you may complete a SOC visit before discovering a coverage issue — and the NOA clock has already started.

SOC date ambiguity. Some agencies treat the SOC date as the physician order date or the OASIS completion date. It’s neither. The SOC date is the date of the first billable skilled visit. Confusion here can cause an agency to miscalculate the deadline.

Orders and OASIS not ready. The NOA requires a HIPPS code, which requires a completed OASIS and valid diagnosis coding. Delays in OASIS completion or physician order signatures create a bottleneck right at the five-day window. The visit may be done; the paperwork may not be.

No single owner of the clock. In many agencies, the intake team hands off to the clinical team, which hands off to billing — and nobody explicitly tracks the NOA deadline. The five-day clock isn’t always visible to the person who can actually submit the claim. By the time billing notices, it’s day six.

The operational fix is simple in concept and hard in practice: someone must own the NOA deadline from the moment the SOC visit occurs, and that person needs a workflow — ideally automated — that surfaces the deadline and the status of everything required to submit.

Revenue-cycle discipline at this level becomes even more important when payment rates are under pressure. Tightening the NOA process is one of the operational levers we described in our breakdown of what home health owners should do now heading into CY 2027.

The bottom line

The NOA is not complex, but it is unforgiving. One late filing can reduce your payment across an entire admission, and the reduction is money the agency absorbs, not the patient. In a margin-compressed environment, avoidable NOA penalties are an operational problem with a straightforward fix: know when the clock starts, know who’s watching it, and make sure the systems are in place to submit before day five.

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Home Health Engine tracks the NOA clock from intake — surfacing the deadline and the claim status so nothing falls through the intake-to-billing handoff. The EMR builds the HIPPS code from your OASIS and submits the NOA and final claims from inside the chart. Prefer to hand off the revenue cycle entirely? Our team runs full-service home health billing for 3% of collected revenue. Talk to us.

Sources: NGS Medicare, Home Health Billing (notice of admission guidance, accessed June 2026); Palmetto GBA, Home Health NOA FAQ (Jurisdiction M HHH, accessed June 2026); HealthRev Partners, “Notice of Admission in 2026” (healthrevpartners.com, accessed June 2026); CMS Medicare Claims Processing Manual, Pub. 100-04, Chapter 10 (home health billing). Regulatory details confirmed against MAC guidance as of June 2026; confirm against current CMS guidance before relying on specific figures or procedures.