US · guidance
CMS Pub. 100-01, ch. 7, § 50.4.4
Date of Service
The date of service (DOS) is the date a provider renders service to a beneficiary. Unless
otherwise specified, the effective date of a change request is the date of service.
For the purpose of processing claims, the effective date for applying processing rules, laws,
processes, and/or policies is the date the beneficiary received a service from a provider. For
Durable Medical Equipment (DME) claims with spanned dates of service, the ViPS Medicare
System (VMS) will use only the “From” DOS as the date the supplier rendered a service to a
beneficiary. For example, if a new rule or law became effective on January 1, 2011, and a
beneficiary received service on December 27, 2010, then that service would not be covered
under the new rule. If the beneficiary received the service on or after January 1, 2011, then that
service would be covered by the new rule.
More service-specific information on the Date of Service can be found in. Pub.100-02, Medicare
Benefit Policy Manual and Pub. 100-04, Medicare Claims Processing Manual.
History
(Rev. 66, Issued: 01-07-11, Effective: 02-08-11, Implementation: 02-08-11)
Provenance
- Source
- cms.gov
- Retrieved
- 2026-08-25
- Edition
- iom-2026-08-25
- Content hash
f1eb3754c16f88af0c89e2bd2ef07bd6a9e943594a82c8c063e9500f0e6a875b
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