# Medicare Snf Eligibility > Reason through skilled nursing facility (SNF) coverage before or at admission: Medicare Part A benefit-period math, the 3-day qualifying stay, Medicare Advantage authorization, Medicaid and Medicaid-pending risk, and payer coordination. Use whenever the user mentions eligibility, benefit days, qualifying stay, 3-day stay, observation vs inpatient, 30-day transfer rule, benefit period, coinsurance days, 100 days, Medicaid pending, share of cost, patient liability, prior authorization for a SNF admission, or coverage verification for a referral or admission. Produces a structured eligibility worksheet with a coverage determination, benefit-days math, risks, and open items to verify. - Skill: `magicare-ai/medicare-snf-eligibility` (Agent Skill) - Install (CLI): `npx skillmds@latest add magicare-ai/medicare-snf-eligibility` - Raw SKILL.md: https://api.skillmd.com/api/skills/magicare-ai/medicare-snf-eligibility/raw - Safety review: pending - Works with: Claude Code, Claude.ai, OpenAI Codex - Category: Coding & Dev Tools - License: MIT - Author: magicare-ai (https://skillmd.com/u/magicare-ai) - Updated: 2026-09-17 - Page: https://skillmd.com/skills/magicare-ai/medicare-snf-eligibility --- # Medicare SNF Eligibility Reasoning Help SNF admissions and billing staff reason through whether a prospective admission is covered, by which payer, for how many days, and at what financial risk — BEFORE the resident is in the building. A wrong call here becomes an uncollectible stay, so the goal is a defensible, documented determination with every unverified assumption flagged. Never guess facts you don't have (dates, plan names, days used). Ask for them or list them as open items. Never state current-year dollar amounts — they change annually; always instruct the user to look up the current figure. ## Step 1: Identify the payer situation Ask (or extract from what the user provided): 1. What coverage does the patient have? Traditional Medicare (FFS) Part A, a Medicare Advantage (MA) plan, Medicaid, dual-eligible, commercial, or nothing confirmed yet? 2. Where is the patient coming from — hospital inpatient, observation, emergency department, home, another SNF? 3. Key dates: hospital admission and discharge dates, planned SNF admission date, any prior SNF stays and their dates. Route the analysis: FFS → Step 2. MA → Step 3. Medicaid or Medicaid-pending → Step 4. Multiple payers → also do Step 5. Always finish with Steps 6–7. ## Step 2: Medicare FFS Part A analysis Work through these gates IN ORDER — each one can independently kill coverage. ### Gate 1: 3-day qualifying inpatient hospital stay Medicare Part A SNF coverage requires a medically necessary INPATIENT hospital stay of at least 3 consecutive days, counting the admission day but NOT the discharge day. **The classic trap: observation days do not count.** A patient can spend four nights in a hospital bed and have zero qualifying days if they were under observation (outpatient) status. Always ask: was the patient formally admitted as an inpatient, and on what date did inpatient status begin? The hospital's Medicare Outpatient Observation Notice (MOON) and the discharge paperwork show status. If any of the days were observation, count only the inpatient days. Beneficiaries reclassified from inpatient to observation may appeal the reclassification (post-*Barrows v. Becerra* process); a successful appeal can retroactively create a qualifying stay — verify the current process. **Waivers exist — check for them.** Some ACO / shared-savings programs, other CMS waiver models, and many MA plans waive the 3-day requirement. If the hospital or attending group participates in a SNF 3-day-rule waiver, the stay may qualify anyway — but the waiver applies only to specific providers and beneficiaries, so verify participation for THIS patient; never assume it. ### Gate 2: 30-day transfer rule The SNF admission generally must begin within 30 days of the qualifying hospital discharge (limited medical-appropriateness exceptions exist). Compute the gap between hospital discharge and SNF admission. More than 30 days out, the qualifying stay no longer supports coverage — flag it as a hard risk. **30-day SNF readmission rule.** A readmission to a SNF within 30 days of discharge from a prior covered SNF stay needs NO new 3-day qualifying stay — the stay continues under the same benefit period, using the remaining days. ### Gate 3: Benefit days remaining Medicare covers up to 100 days of SNF care PER BENEFIT PERIOD, not per year and not per lifetime: - **Days 1–20:** Medicare pays in full. - **Days 21–100:** the beneficiary owes a daily coinsurance. Do NOT quote a dollar amount — it changes every year. Instruct the user to look up the current-year SNF coinsurance on medicare.gov or from their MAC, and to check whether a Medigap/supplement or Medicaid picks it up. - **After day 100:** no Part A SNF coverage until a new benefit period begins. **Benefit-period mechanics.** A benefit period starts with inpatient hospital care **or** covered SNF care (not only an inpatient hospital admission) and ends only after the beneficiary has gone **60 consecutive days** without inpatient hospital care or skilled care in a SNF. Only then does the 100-day counter reset (a new qualifying hospital stay is also needed for the new period). Custodial residence in a nursing facility does not break the 60-day clock by itself, but receiving skilled-level care does. So you must know: prior hospital and SNF stays, dates, and whether there was a 60-day skilled-care-free gap. Days already used in the current benefit period come off the 100. Verify actual days used through the eligibility systems (HETS via your eligibility vendor/clearinghouse, or the MAC portal) — hospital report and family recollection are not reliable. ### Gate 4: Skilled-need requirement Coverage requires that the patient needs — and receives — **daily** skilled nursing or skilled rehabilitation services (skilled **nursing** on a daily basis means 7 days/week; daily skilled **rehabilitation** alone satisfies the requirement at 5+ days/week — nursing needed only 5 days/week does not qualify) that as a practical matter can only be provided in a SNF, for a condition related to the qualifying stay. Custodial care alone (bathing, dressing, supervision) is never covered, even with days remaining. Note: under the Jimmo settlement, skilled care to MAINTAIN function or prevent decline can qualify — improvement is not required. Flag admissions where the skilled need looks thin (e.g., stable patient, no therapy orders). ## Step 3: Medicare Advantage analysis **Eligibility is not authorization.** An MA member can have benefit days available and the claim still denies because the plan never authorized the stay. For every MA referral, verify: 1. **Active enrollment and the exact plan** — plans change every January and mid-year for some enrollees; confirm the current plan ID, not last year's card. 2. **Network status** — is your facility in-network for this specific plan and product (HMO vs PPO vs I-SNP)? Out-of-network changes everything. 3. **Prior authorization** — is auth required (usually yes), has it been issued, for how many days, and with what concurrent-review cadence? Record the auth number, dates approved, and reviewer contact. 4. **Qualifying-stay rules** — most MA plans waive the 3-day inpatient requirement, but it is plan-specific. Never assume; confirm with the plan. 5. **Cost sharing** — MA SNF copay structures differ from FFS; get the plan's day-band copays from the plan or portal, not from memory. Treat an MA admission without an auth number as at-risk regardless of what a discharge planner said verbally. ## Step 4: Medicaid and Medicaid-pending analysis Medicaid rules vary substantially BY STATE — everything below must be verified with the specific state's Medicaid agency; do not present it as settled. For an established Medicaid recipient, verify: 1. **Active eligibility** in the state's verification system, on the admission date, in a category that covers nursing facility services. 2. **Level-of-care (LOC) determination** — nursing facility coverage requires the state's LOC/medical-necessity determination (often via a state assessment process); confirm it is done or initiated, and note PASRR screening is a federal precondition to NF admission. 3. **Patient liability / share of cost** — most states apply the resident's income (minus a personal needs allowance and other deductions) to the cost of care. Compute the expected monthly liability with the state's rules and set up collection from day one. 4. **Managed-care enrollment** — if the state runs Medicaid managed care / MLTSS, the plan (not the state) may control auth and payment. See Step 5. **Medicaid-pending admissions** are a business decision to extend credit. Before accepting one, run this risk checklist: - **Application status:** Filed or not? With what agency, on what date, and who is tracking it? An unfiled application is the highest-risk state. - **Retroactive eligibility window:** Many states can grant eligibility retroactive to some period before the application month, but several states have waived or narrowed retroactive coverage — verify the window in YOUR state before counting on it to cover admission-date-forward days. - **Asset picture:** Countable assets near the state limit? Any transfers within the lookback period that could trigger a penalty period? A penalty period means Medicaid will not pay even after approval. - **Responsible-party engagement:** Is there a cooperative family member, agent under POA, or guardian who will produce documents (bank statements, deeds, insurance) promptly? Uncooperative or absent responsible parties are the most common reason pending cases die. - **Income and liability:** Even when approved, the patient liability portion must be collectible. Document the risk decision and who approved it. ## Step 5: Coordination of benefits - **Medicare primary vs secondary:** Medicare is usually primary for a SNF stay, but check for situations where another payer is primary (e.g., liability/no-fault or workers' comp for the admitting condition, or certain employer group coverage situations). Query the eligibility response for MSP (Medicare Secondary Payer) flags. - **Dual-eligibles:** Medicare (or the MA plan) pays first; Medicaid may pick up coinsurance days 21–100 subject to state rules — verify with the state. - **Hospice:** If the patient has elected hospice, the hospice benefit covers care related to the terminal condition, and SNF **room and board is not a Medicare benefit** — it's billed to the hospice (per their contract with you), to Medicaid where applicable, or privately. A Part A skilled SNF stay for the terminal condition generally cannot run alongside hospice; a Part A stay for an unrelated condition is possible but scrutinized. Always ask about hospice election before quoting Part A coverage. - **Managed-care carve-ins:** Some states have moved (carved in) nursing facility benefits into Medicaid managed care, and some MA/D-SNP products bundle both sides. Identify every plan the patient is enrolled in and which one actually pays for NF services. ## Step 6: Verification workflow (every admission) Check, and save evidence for, each item: 1. **Identity and MBI** — name, DOB, and Medicare Beneficiary Identifier exactly as on the card/eligibility response; mismatches cause rejections. 2. **Eligibility response** — run the payer eligibility check (HETS via your clearinghouse or MAC portal for FFS; plan portal or 270/271 for MA and Medicaid). Save a dated copy/screenshot. 3. **Benefit days remaining and benefit-period status** — from the eligibility response, not from the hospital. 4. **Prior stay history** — hospital and SNF stays that drive the qualifying stay, the 30-day transfer window, and the 60-day reset math. 5. **Inpatient status proof** — discharge summary or hospital face sheet showing inpatient admission date (not observation). 6. **MA plan and authorization** — plan ID, network status, auth number, approved dates. 7. **Secondary coverage** — Medigap, Medicaid, or other; who takes the coinsurance days. 8. **Hospice election status.** Save: eligibility screenshots/printouts with dates, auth numbers and names of plan representatives with date/time of calls, hospital status documentation, and the completed worksheet (Step 7). If it isn't documented, it didn't happen when the denial arrives. ### Worked example (fictional dates) Patient discharged from an inpatient hospital stay 2026-03-10 after being admitted as inpatient 2026-03-06 (4 inpatient days — qualifying stay met, even though the first night, 2026-03-05, was observation and does not count). SNF admission planned 2026-03-12 — 2 days after discharge, inside the 30-day window. Eligibility response shows 35 SNF days already used in the current benefit period (a prior SNF stay ended 2026-01-20, and fewer than 60 skilled-care-free days elapsed before the 2026-03-06 hospital admission, so NO reset occurred). - Days remaining: 100 − 35 = **65 days**. - Full-coverage days at this SNF: days 36–? … none — day 20 was passed during the prior stay, so **every covered day this stay is a coinsurance day** (the patient enters at benefit day 36). - Coinsurance days available: days 36 through 100 = 65 days at the current-year daily coinsurance (look up the current amount; check Medigap/ Medicaid for pickup). - Coverage still contingent on daily skilled need being met and documented. ## Output format Produce the worksheet exactly in this structure, filling what is known and marking everything unverified: ```markdown # SNF Eligibility Worksheet — [Patient initials only, no full PHI] Prepared: [date] | Prepared by: [name/role] | Planned admission: [date] ## 1. Coverage determination - Primary payer: [FFS Part A / MA plan name / Medicaid / other] - Determination: [COVERED / COVERED WITH CONDITIONS / NOT COVERED / PENDING] - Basis: [one or two sentences citing the gates above] ## 2. Qualifying stay & timing (FFS) - Inpatient admission date: [date] | Discharge: [date] | Inpatient days: [n] - Observation days excluded: [n / none / UNVERIFIED] - 3-day stay met: [YES / NO / WAIVED (program: ___) / UNVERIFIED] - Days from discharge to SNF admission: [n] (30-day rule: [MET / NOT MET]) ## 3. Benefit days math - Days used this benefit period: [n] (source: [eligibility response / UNVERIFIED]) - 60-day reset since last skilled care: [YES / NO / UNVERIFIED] - Days remaining: 100 − [used] = [n] - Entering at benefit day: [n] → full-coverage days: [n]; coinsurance days: [n] - Daily coinsurance: LOOK UP current-year amount | Picked up by: [Medigap / Medicaid / patient / UNVERIFIED] ## 4. Authorization & plan checks (MA / managed Medicaid) - Plan & ID: [ ] | In network: [YES/NO/UNVERIFIED] - Auth required: [Y/N] | Auth #: [ ] | Approved dates: [ ] | Review cadence: [ ] ## 5. Medicaid / Medicaid-pending risk - Status: [active / pending / n/a] | Application filed: [date/NO] - LOC determination & PASRR: [status] | Patient liability est.: [amount/UNVERIFIED] - Retro window in [state]: [VERIFY with state] | Asset/transfer concerns: [notes] - Responsible party engaged: [YES/NO] | Risk decision & approver: [ ] ## 6. Coordination - Secondary coverage: [ ] | MSP flags: [ ] | Hospice election: [YES/NO/UNVERIFIED] ## 7. Risks - [Bulleted list — each risk with impact, e.g. "Observation status unconfirmed — if days 1–2 were observation, qualifying stay fails and stay is not covered."] ## 8. Open items to verify (with source) - [Item] — [source: plan phone # / plan portal / MAC portal / HETS via clearinghouse / state Medicaid agency / hospital HIM] ## Evidence saved - [List of screenshots, auth numbers, call logs with dates] ``` Fill every section; write "n/a" rather than deleting sections so gaps are visible. Anything not confirmed against an eligibility system or the payer must appear in section 8. ## Disclaimer This skill is educational and summarizes generally applicable, publicly known Medicare and Medicaid rules. It is not billing, coding, reimbursement, or legal advice, and rules, amounts, and state policies change. Always verify coverage and requirements directly with the payer, your Medicare Administrative Contractor (MAC), the specific health plan, and the state Medicaid agency before relying on any determination.