If a hospital just handed you a Medicare Outpatient Observation Notice — the MOON form, CMS-10611 — it means you have been receiving observation services as an outpatient for more than 24 hours and have not been formally admitted as an inpatient. Sign it to acknowledge you received it, keep your copy, and read the rest of this page before you leave the hospital, because your response now affects what you pay and whether Medicare will cover skilled nursing care afterward.
What Signing the MOON Actually Means
Your signature on the MOON confirms one thing only: the hospital gave you the notice and explained it to you. It is not agreement with your observation status, and it does not waive any right to challenge your classification or the resulting bills.1Centers for Medicare & Medicaid Services. Medicare Outpatient Observation Notice
Before you sign, hospital staff must give you an oral explanation covering your outpatient status, why you weren’t admitted, how observation affects your costs, and the skilled nursing facility coverage gap. Ask questions. If something on the form is unclear — especially the clinical reason the hospital gave for keeping you under observation rather than admitting you — get an answer before you put your name on it.
If someone is acting on your behalf, that person can sign instead. You are entitled to a paper copy even if the hospital presented the notice on a screen.2Centers for Medicare & Medicaid Services. Medicare Claims Processing Manual Chapter 30 – Section 400
If You Refuse to Sign
Refusing to sign changes nothing about your status and triggers no penalty against you. A hospital staff member will sign the form themselves, note their name and title, certify that the notice was presented, and record the date and time of your refusal in the Additional Information section. That date and time counts as the official receipt date.2Centers for Medicare & Medicaid Services. Medicare Claims Processing Manual Chapter 30 – Section 400 Refusal creates a paper trail; it does not create leverage. If you want to change your classification, the tools below matter more than withholding a signature.
Why This Notice Matters for Your Wallet
Observation is an outpatient service, so your bill runs through Medicare Part B rather than Part A. Instead of a single inpatient hospital deductible — $1,736 per benefit period in 2026, covering up to 60 days — you pay the $283 annual Part B deductible if you haven’t already met it, 20% coinsurance on doctor services, and individual copayments for each outpatient hospital service.3Medicare.gov. 2026 Medicare Costs4Medicare.gov. Medicare and You Handbook 2026 Individual copayments generally cannot exceed the Part A deductible amount per service, but they stack across the many services a hospital stay generates.
Self-administered drugs — the pills you would normally take at home, including things like blood pressure medication or insulin — are generally not covered by Part B during an outpatient stay, and the hospital typically charges you directly for them. If you have a Part D plan, you may be able to submit receipts for reimbursement afterward.5Centers for Medicare & Medicaid Services. Billing for Self-Administered Drugs Given in Outpatient Settings
The Skilled Nursing Facility Gap
This is the part of the MOON that catches people. Medicare Part A only covers skilled nursing facility care if you first have a qualifying inpatient hospital stay of at least three consecutive days. Time spent under observation does not count toward those three days, no matter how many nights you spent in a hospital bed.6Centers for Medicare & Medicaid Services. Skilled Nursing Facility 3-Day Rule Billing If your doctor recommends rehab or skilled nursing care after discharge and you haven’t accumulated three qualifying inpatient days, Medicare will not cover it. Out-of-pocket skilled nursing costs can run several hundred dollars a day.
What to Do While You’re Still in the Hospital
Your best window to change the outcome is now, before discharge. Talk to your treating physician directly about your status. Doctors sometimes place patients under observation as a precaution and reassess later.
The clinical standard is the Two-Midnight Rule: if your doctor expects, based on your medical history, current symptoms, and severity, that you will need hospital-level care spanning at least two midnights, inpatient admission is generally appropriate.7Centers for Medicare & Medicaid Services. Two-Midnight Rule Standards for Admission CMS also notes that observation services rarely extend beyond 48 hours. If you’ve been under observation longer than that and no one has explained why, ask.
If your condition has worsened or become more complex since you were placed under observation, tell your doctor and ask whether you now meet inpatient criteria. A physician can write a formal admission order and convert your status. Once that order is written, observation time can in some cases count retroactively toward your inpatient stay for billing purposes.
If Your Status Was Downgraded From Inpatient
A separate appeal exists if the hospital initially admitted you as an inpatient and later changed your status to outpatient observation. Since February 14, 2025, patients in this situation can request a fast appeal while still in the hospital.8Medicare.gov. Appeal When a Hospital Changes Your Status From Inpatient to Outpatient Getting Observation Services
The hospital should give you a separate form, the Medicare Change of Status Notice (CMS-10868), which explains this appeal right. You file with your local Beneficiary and Family Centered Care Quality Improvement Organization (BFCC-QIO) and typically get a decision about two days after filing. If the BFCC-QIO agrees the downgrade was wrong, you owe the Part A inpatient deductible instead of Part B cost-sharing, and your days count toward the three-day SNF requirement. If it upholds the downgrade, Part B costs and the SNF gap stand.
This fast appeal covers status downgrades only. If you were placed under observation from the beginning and never had an inpatient admission order, this route isn’t available to you. You can still dispute charges through the standard Part B claims appeal process after you receive your Medicare Summary Notice.
If You Have Medicare Advantage
Medicare Advantage enrollees receive the MOON too, but the rules underneath it can differ. Your plan’s copayments and coinsurance for observation may not match Original Medicare’s structure, and some Medicare Advantage plans waive the three-day inpatient requirement for skilled nursing coverage entirely. Check your evidence of coverage or call the number on your member ID card before assuming the SNF gap applies to you. Separately, if your hospital or doctor participates in an Accountable Care Organization under the Medicare Shared Savings Program, ask whether an SNF three-day rule waiver applies at affiliated nursing facilities.9Centers for Medicare & Medicaid Services. SNF 3-Day Rule Waiver Guidance
The MOON also notes that Qualified Medicare Beneficiaries through Medicaid cannot be billed for Part A or Part B deductibles, coinsurance, or copayments.
Keep Your Copy
Hold on to the signed MOON with your discharge paperwork, Medicare Summary Notices, and any hospital bills, and keep them for at least a few years. The form documents when observation started, the hospital’s clinical reason for not admitting you, and when you were notified. If you later need skilled nursing care that Medicare denies, or you want to dispute a hospital charge, that documentation is the record of what you were told and when.