US · guidance
CMS Pub. 100-05, ch. 6, § 30.1.1
MSP Effective Date Change Procedure
When the MSP Contractor becomes aware that an MSP effective date is incorrect, it shall
perform the following functions:
• Delete the auxiliary record containing the incorrect MSP effective date using an
MSP delete transaction; and
• Submit a CWF, MSP maintenance transaction with the correct MSP effective date
to establish a new auxiliary record.
NOTE: When the beneficiary is entitled to both Parts A and B, the MSP Contractor shall
use the Part A entitlement date, if the insurance effective date is prior to entitlement to
Medicare.
History
(Rev. 12078; Issued:06-14-23; Effective: 05-29-23; Implementation: 05-29-23)
Provenance
- Source
- cms.gov
- Retrieved
- 2026-08-25
- Edition
- iom-2026-08-25
- Content hash
0bbd45d5bc2bf42d643800cd9861095df9b3c52ed05d02b99c20f4a98b2d1952
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