Medicare Part A covers up to 100 days of nursing home care per benefit period, but the full coverage only lasts for the first 20 days. From Day 21 to Day 100, you are responsible for a daily co-insurance rate—$204 in 2024—unless you have supplemental insurance. Furthermore, coverage only continues as long as you require daily skilled nursing or therapy, a standard facilities often interpret narrowly to save costs.

Before the 100-day clock even starts, you have to clear a hurdle that catches thousands of families off guard: the three-day inpatient rule. To qualify for nursing home coverage, you must have stayed in a hospital as an 'inpatient' for at least three consecutive days. This does not include the day you are discharged, and—here is the kicker—it does not include time spent under 'observation status.'

Hospitals are increasingly classifying people as observation residents even when they are sleeping in a hospital bed and receiving intensive care. If the paperwork says 'observation,' Medicare will not pay a single cent for the subsequent nursing home stay. You could spend four nights in a hospital, move to a care facility, and receive a bill for $10,000 two weeks later because the hospital never technically admitted you.

Always demand to know the status of the hospital stay within the first 24 hours. If they say 'observation,' ask the doctor to change it to 'inpatient' based on the complexity of the care required. Once the resident leaves the hospital, it is almost impossible to retroactively change this status, and the financial window for Medicare coverage slams shut.

If you clear the three-day rule, you enter the 100-day benefit period, but it isn't a flat rate. Days 1 through 20 are covered at 100% by Medicare. This is the honeymoon phase where everyone is focused on physical therapy and recovery. On Day 21, the math changes. You are hit with a daily co-insurance of $204 (based on 2024 rates). Over the remaining 80 days of the benefit, that adds up to $16,320.

Many people with Medigap or secondary insurance plans will have this co-pay covered, but those on standard Medicare or certain Medicare Advantage plans may be on the hook for the full amount. If the resident is not making 'measurable progress'—a term the facility gets to define in their initial reports—the facility may try to end the coverage even before Day 100. They want the bed for a new resident whose first 20 days are fully reimbursed at a higher rate by the government.

This creates a perverse incentive for facilities to 'plateau' residents. When a therapist says, 'Mom has reached her potential,' they are often signaling the end of Medicare's willingness to pay. You have the right to an expedited appeal if you believe the discharge is premature, but you have to act within hours of receiving the notice.

For decades, nursing homes told families that Medicare only pays if the resident is getting better. This led to thousands of people with chronic conditions or dementia being kicked out because they weren't 'improving.' This is legally false. Thanks to a landmark settlement known as Jimmo v. Sebelius, Medicare must pay for skilled care even if it is only to maintain the person's current condition or slow their decline.

If a facility tells you they are stopping Medicare coverage because your parent has 'plateaued,' they are violating federal policy. Skilled nursing and therapy are covered as long as they are necessary to prevent deterioration. You must use the phrase 'maintenance coverage' when speaking with the care coordinator. It is the magic password that lets them know you understand the law.

Be aware that while Medicare might continue to pay for the 'skilled' portion of the care, it never pays for 'custodial' care—things like help with bathing, eating, or dressing—long-term. Once the need for daily nursing or active therapy ends, the 100-day benefit ends, regardless of how many days are left on the calendar. This is when families must transition to private pay, which often costs between $300 and $500 per day depending on the Palmelle Clarity Score of the facility.