42 CFR § 484.55 — Condition of participation: Comprehensive assessment of patients

42 CFR — Public Health · CMS / HHS

42 CFR 484.55 is THE foundational HHA Condition of Participation — every Medicare/Medicaid home health patient must get a comprehensive assessment within 5 days of start-of-care, with an initial visit within 48 hours of referral. The assessment captures the patient's status, sets care goals, and triggers the plan of care under 42 CFR 484.60. For Medicare patients, the assessment must collect OASIS data — the standardized federal home health outcome dataset. Missing assessments, late assessments, or incomplete OASIS items are among the top CMS survey findings. A condition-level deficiency on 484.55 can put an HHA on a 90-day plan of correction with re-survey.

Regulation summary

Each patient must receive a patient-specific, comprehensive assessment. The comprehensive assessment must accurately reflect the patient's status, including the patient's progress toward achieving identified goals. The initial assessment visit must be conducted by a registered nurse for nursing services, or by an appropriate qualified discipline for therapy-only cases, and must occur either within 48 hours of referral, within 48 hours of the patient's return home, or on the physician/allowed practitioner-ordered start-of-care date. The comprehensive assessment must be completed in a timely manner, consistent with the patient's immediate needs, but no later than 5 calendar days after the start of care. The assessment must include OASIS data items for Medicare/Medicaid patients.

Who must comply

All Medicare and Medicaid certified Home Health Agencies (HHAs). The Conditions of Participation under 42 CFR Part 484 apply to every certified HHA — not optional. Private-duty home health agencies that don't bill Medicare/Medicaid are governed by state-specific licensure rules, which often mirror the federal CoPs.

What happens if violated

CMS survey deficiencies. Standard-level deficiency (one or more standards within the CoP cited): plan of correction required. Condition-level deficiency (broad CoP failure): plan of correction + 23-day re-survey requirement; risk of Medicare/Medicaid certification termination if not corrected. Civil Monetary Penalties (CMPs) for HHAs: $11,317-$25,000 per day per CoP deficiency. State licensure consequences in addition. Combined exposure: $100K-$500K+ for a single comprehensive assessment failure across multiple patients.

Implementation checklist

• Establish referral-receipt workflow that documents date/time of referral.
• Schedule initial assessment within 48 hours of referral (or per physician-ordered SOC date).
• Conduct comprehensive assessment within 5 calendar days of SOC.
• Use OASIS for Medicare/Medicaid patients — complete all required data items.
• Use RN for nursing services initial assessment; appropriate qualified discipline for therapy-only.
• Document patient goals consistent with assessment findings.
• Trigger care planning under 42 CFR 484.60 from the comprehensive assessment.
• Reassess at required intervals (recertification, significant change in condition, transfer, discharge).
• Audit assessment timeliness monthly across the patient census.
• Train clinicians on OASIS item-by-item accuracy.

Common misinterpretations

• Misinterpretation: 'The 48-hour rule means business days.' Reality: 42 CFR 484.55(a) specifies 48 hours from referral — calendar hours, not business hours. Weekend/holiday referrals require weekend/holiday initial visits unless the physician orders a later start of care.
• Misinterpretation: 'OASIS is just for billing.' Reality: OASIS is the assessment instrument required by 42 CFR 484.55 AND 484.45. It captures patient status, drives the plan of care, determines reimbursement, and feeds Home Health Compare quality metrics. Inaccurate OASIS = inaccurate plan of care = potential 484.60 deficiency too.
• Misinterpretation: 'A PT can do the initial assessment for a wound-care patient.' Reality: 42 CFR 484.55(b) requires a registered nurse (RN) for nursing services. For therapy-only patients, the appropriate qualified discipline (PT, OT, or SLP) can conduct the initial assessment. Wound care = nursing service = RN required.
• Misinterpretation: 'Late assessments can be corrected after the fact.' Reality: The 5-day comprehensive assessment deadline is the regulation. Missing it creates a citable deficiency regardless of subsequent corrective action. The 'corrected' assessment doesn't undo the original violation.

Frequently asked questions

Cross-references: 42 CFR 484.45 · 42 CFR 484.60 · 42 CFR 484.65 · 42 CFR 484.75

Authoritative source: eCFR.gov →

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