US Medical Term · billing
Date of Service
Fecha de Servicio
In 9 languages
| Language | Term |
|---|---|
| English | Date of Service |
| Spanish (Español) | Fecha de Servicio |
| Chinese (中文) | 服务日期 |
| Korean (한국어) | 서비스 날짜 |
| Vietnamese (Tiếng Việt) | Ngày dịch vụ |
| Filipino (Tagalog) | Petsa ng Serbisyo |
| Portuguese (Português) | Data do Serviço |
| Thai (ภาษาไทย) | วันที่ให้บริการ |
| Japanese (日本語) | 診療日 |
What it means
The date of service (DOS) is the specific calendar date on which a medical service, procedure, exam, or prescription was provided to a patient. It is one of the most critical data points on any insurance claim or medical bill. Insurers use the date of service to verify that coverage was active on that day, to apply the correct plan-year deductibles and out-of-pocket amounts, and to enforce timely filing deadlines—the window within which a provider must submit a claim. If your date of service falls outside your coverage period or after a lapse in enrollment, a claim may be denied. Always check that the date of service on your bill matches your actual appointment or procedure date, as billing errors here are common and can cause unnecessary denials or duplicate charges.
How to say it
Sentences a patient might use with a doctor, nurse, pharmacist, or insurer:
The date of service on my bill is wrong—they charged me for a day I was not in the hospital.
La fecha de servicio en mi factura es incorrecta; me cobraron por un día que no estaba en el hospital.
My insurer denied the claim because the date of service was outside my coverage period.
Mi aseguradora negó el reclamo porque la fecha de servicio estaba fuera de mi período de cobertura.
Providers must submit claims within a set number of days from the date of service.
Los proveedores deben presentar reclamos dentro de un número determinado de días desde la fecha de servicio.
Where you'll see it
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Sources
Last reviewed: September 2026