Admission Source

A period is classified as institutional when the patient had a qualifying inpatient stay in the 14 days before the home health admission. Qualifying settings include:

• Acute care hospitals (inpatient stays, not observation)
• Skilled nursing facilities (SNFs)
• Inpatient rehabilitation facilities (IRFs)
• Long-term care hospitals (LTCHs)
• Inpatient psychiatric facilities

Everything else is community: referrals from physician offices, outpatient clinics, emergency department visits without an inpatient admission, and observation stays. For periods after the first, an intervening acute hospital stay shortly before the period begins can also make that period institutional.

Medicare does not take the agency's word for admission source. The claims processing system checks the beneficiary's claims history in Medicare's own records for qualifying inpatient stays and assigns the source accordingly, using that determination for payment. Agencies can report occurrence codes to indicate a recent institutional discharge, but the payer-side check is authoritative. This cuts both ways: an agency that misses a recent hospital stay leaves the higher institutional weight to Medicare's recoding, and an agency that assumes institutional status based on a referral that never resulted in an inpatient admission will be paid at the community rate. Reconciling submitted versus paid classifications on remittances catches both patterns.

Institutional periods carry meaningfully higher case-mix weights than otherwise identical community periods, reflecting the acuity and instability of patients coming out of facilities. For an agency's economics, admission source is largely a function of referral mix: hospital and post-acute referral relationships produce institutional admissions, while physician and community referrals produce community admissions. Neither is inherently better business, but they price differently and consume resources differently, so growth planning, staffing models, and per-period cost expectations should account for the split rather than treating all admissions as equivalent.

Admission source accuracy is an intake discipline. Capture the discharging facility and the exact inpatient discharge date on every referral, and verify whether a hospital encounter was inpatient or observation, since the distinction changes the classification. Check eligibility systems for recent inpatient claims rather than relying on the referral packet. Watch the 14-day window: a patient referred at discharge but not admitted to home health until day 15 or later classifies as community, which is both a payment difference and a care-timeliness signal worth tracking.