Medicare Three-Day Rule for SNF in New Hampshire

The Rule in Plain Terms

Medicare Part A covers skilled nursing facility care after a hospital stay, but only if the patient has been formally admitted as an inpatient for at least three consecutive calendar days. The count starts on the day of admission and excludes the day of discharge. So a patient admitted on Monday and discharged on Thursday has three qualifying days (Monday, Tuesday, Wednesday).

This three-day requirement is the gateway to up to 100 days of Medicare-covered SNF care. Days 1 through 20 are covered at 100%. Days 21 through 100 require a daily coinsurance payment from the patient. After day 100, Medicare coverage ends entirely and the family assumes full financial responsibility — or transitions to Medicaid if the patient qualifies.

In New Hampshire, private-pay nursing home costs average between $11,000 and $12,000 per month. The difference between having Medicare SNF coverage and not having it can represent tens of thousands of dollars in the first few months after hospital discharge.

What Doesn't Count

Observation status hours do not count. This is the most common and most costly trap. A parent can spend three nights in a hospital bed receiving active treatment, and if the hospital classifies the stay as observation rather than inpatient, none of that time counts toward the three-day requirement. Medicare Part A will not cover subsequent SNF care.

Emergency department time does not count. Hours spent in the ER before a formal inpatient admission order begins do not contribute to the three-day calculation.

The day of discharge does not count. If a patient is admitted on a Tuesday and the hospital begins talking about discharging on Thursday, that's only two qualifying days (Tuesday and Wednesday). The patient needs to remain admitted through Thursday with a Friday discharge to hit the three-day threshold.

How to Track Qualifying Days

Start counting the moment the formal inpatient admission order is written — not when your parent arrived at the hospital. Ask the attending physician or case manager to confirm the exact date and time of the inpatient admission order. If the patient was under observation for any period before being converted to inpatient status, only the time after the conversion order counts.

Keep a written log of each calendar day. Note the admission date, any status changes, and the projected discharge date. If you see that a Thursday discharge would leave your parent one day short of the three-day requirement, discuss the clinical justification for extending the stay with the attending physician.

What Happens When You Fall Short

If your parent doesn't meet the three-day threshold and needs post-acute rehab, you have limited options:

Medicare Advantage plans may have different rules. Some MA plans waive the three-day requirement for SNF coverage, though they typically require the SNF to be in-network. Check your parent's specific plan documents or call the plan's member services number.

Appeal the observation classification. If the hospital placed your parent under observation when clinical criteria supported inpatient admission, you can challenge the classification after discharge through Medicare's standard appeal process.

Explore the CFI waiver. New Hampshire's Choices for Independence Medicaid waiver covers home and community-based care services for individuals who meet nursing facility level of care. This pathway doesn't depend on the three-day rule, but it does require meeting strict financial and clinical eligibility criteria — including a Medical Eligibility Assessment demonstrating the need for hands-on help with two or more activities of daily living.

Private pay. Some families bridge the gap with short-term private-pay rehab while a Medicaid application is pending. In New Hampshire, SNF rates vary by region, with facilities in the Manchester-Concord corridor generally running higher than rural areas.

The New Hampshire Hospital Discharge Guide includes a tracking worksheet for calculating qualifying inpatient hours and a decision tree for navigating coverage when the three-day rule isn't met.

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