In general, Medicare claims must be filed to the Medicare claims processing contractor no later than 12 months, or 1 calendar year, from the date the services were furnished. To determine the timely filing limit for your service, please enter the date of service.

Part A: For institutional claims that include span dates of service (i.e., a "From" and "Through" date span on the claim), the "Through" date on the claim is used for determining the date of service for claims filing timeliness.

Part B:For professional claims submitted by physicians and other suppliers that include span dates of service, the line item "From" date is used for determining the date of service for claims filing timeliness.

Reference: Medicare Claims Processing Manual, Pub.100-04, Chapter 1 - General Billing Requirements, Section 70 "Time Limitations for Filing Part A and Part B Claims"