Summary & Overview
HCPCS S9994: Lodging for Clinical Trial Participant and Caregiver
HCPCS Level II code S9994 denotes lodging costs for a clinical trial participant and one caregiver/companion, covering nonmedical hotel or temporary accommodation expenses needed to enable trial participation. This code matters nationally as clinical trial support services increasingly affect patient access, trial enrollment, and payer coverage policies. Lodging coverage can reduce barriers for patients who must travel for investigational treatments or study visits, and clarity around use of S9994 influences plan design, prior authorization processes, and billing practices.
Key payers discussed include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. Readers will find a concise overview of the code’s clinical and operational context, typical sites of service, and which payers commonly address lodging for trial participants. The publication outlines benchmarks and coverage patterns where available, notes common billing modifiers included in administrative guidance, and summarizes policy considerations affecting billing and patient access. It also highlights areas where data is limited and calls out where additional policy clarification may be needed. The focus is national in scope and intended for billing professionals, clinical trial administrators, and payer policy analysts seeking a clear, practical reference to S9994.
Billing Code Overview
HCPCS Level II code S9994 represents lodging costs (e.g., hotel charges) for a clinical trial participant and one caregiver/companion. The service covers nonmedical lodging provided to support participation in clinical trial activities when travel or local housing is required.
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Service type: Supportive nonmedical lodging for clinical trial participants and an accompanying caregiver/companion
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Typical site of service: Nonmedical lodging facilities such as hotels or other temporary accommodations used to facilitate clinical trial participation
Clinical & Coding Specifications
Clinical Context
A participant enrolled in an oncology clinical trial lives 250 miles from the trial site. The trial requires daily in-clinic infusions or daytime monitoring for a 5-day investigational drug administration window. The participant’s spouse accompanies them as a caregiver. The sponsor authorizes lodging to ensure protocol adherence and participant safety when same-day travel is impractical. The clinic’s research coordinator arranges hotel reservations under the trial’s travel and lodging benefit, documents dates, room rate, and the presence of one caregiver, and submits claim using the lodging billing code for the patient and one companion. Supporting documentation includes trial enrollment, protocol visit schedule, invoice/receipt from the hotel, and authorization from the study sponsor or institutional review board–approved trial travel policy.
Coding Specifications
| Modifier | Description | When to Use |
|---|---|---|
00 | No modifier — standard reporting | Use when no special circumstances modify the lodging service. |
22 | Increased procedural services | Use if lodging cost is unusually higher due to documented medically necessary circumstances (rare for lodging). |