Comprehensive Assessment

The Conditions of Participation define the scope. The assessment must accurately reflect the patient's current health status and include:

• The patient's continued need for home care and eligibility factors, including homebound status for Medicare
• Clinical, functional, cognitive, and psychosocial status
• A review of all medications the patient is using, with a drug regimen review
• The patient's goals, preferences, and available caregiver support
• OASIS data items for applicable Medicare and Medicaid patients

It is broader than OASIS: OASIS is the standardized data subset embedded inside the comprehensive assessment, not a synonym for it.

Three clocks govern the assessment. The initial assessment visit happens within 48 hours of referral, within 48 hours of the patient's return home, or on the physician-ordered start of care date, and establishes immediate needs and eligibility. The full comprehensive assessment must be completed within 5 days after the SOC date. It must then be updated no less often than the last 5 days of every 60-day certification period, within 48 hours of the patient's return from a hospital admission of 24 hours or more for other than diagnostic tests, and at discharge.

When nursing is ordered, a registered nurse conducts the initial and comprehensive assessment. In therapy-only cases, the appropriate skilled therapist may conduct it: a physical therapist or speech-language pathologist, or an occupational therapist when OT is among the ordered services. The assessing clinician must actually evaluate the patient; the comprehensive assessment is an in-home clinical activity, not an intake form. Findings flow directly into the individualized plan of care, which is why weak assessments reliably produce generic, survey-vulnerable care plans.

Surveyors treat the comprehensive assessment as a condition-level issue when it is late, incomplete, or contradicted by the rest of the record, because the entire care model rests on it. It also carries financial weight: OASIS items inside the assessment set the PDGM functional impairment level, the identified diagnoses support clinical grouping and comorbidity adjustment on claims, and the drug regimen review feeds quality measures. Agencies that audit only OASIS accuracy, and not the surrounding assessment narrative, routinely get caught on consistency findings.