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Data Element
CRX105
CRX.002.105
No Updates
Definition | The Medicare Beneficiary Identifier (MBI) is a randomly generated identifier used to identify all Medicare beneficiaries. It replaced the previously-used SSN-based Medicare HIC Number (HICN). To prevent identify theft, among other reasons, HICN gradually were retired and replaced by the MBI over the course of 2018 and 2019. Starting in 2020, the MBI became the primary identifier for Medicare beneficiaries. |
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Size | X(12) |
FLF Start Position | 808 |
FLF Stop Position | 819 |
Segment Key Field Identifier | Not Applicable |
Coding Requirements | 1. Conditional 2. Value must be an 11-character string 3. Character 1 must be numeric values 1 thru 9 4. Character 2 must be alphabetic values A thru Z (minus S, L, O, I, B, Z) 5. Character 3 must be alphanumeric values 0 thru 9 or A thru Z (minus S, L, O, I, B, Z) 6. Character 4 must be numeric values 0 thru 9 7. Character 5 must be alphabetic values A thru Z (minus S, L, O, I, B, Z) 8. Character 6 must be alphanumeric values 0 thru 9 or A thru Z (minus S, L, O, I, B, Z) 9. Character 7 must be numeric values 0 thru 9 10. Character 8 must be alphabetic values A thru Z (minus S, L, O, I, B, Z) 11. Character 9 must be alphabetic values A thru Z (minus S, L, O, I, B, Z) 12. Character 10 must be numeric values 0 thru 9 13. Character 11 must be numeric values 0 thru 9 14. Value must not contain a pipe or asterisk symbols |
Valid Value Code Set | Valid Value Code | Valid Value Name | Valid Value Description | Effective Start Date | Effective End Date |
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DE Number | System DE Number | DE Name | File Segment Number | File Segment Name |
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CIP222 | CIP.002.222 | MEDICARE-BENEFICIARY-IDENTIFIER | CIP00002 | CLAIM-HEADER-RECORD-IP |
CLT168 | CLT.002.168 | MEDICARE-BENEFICIARY-IDENTIFIER | CLT00002 | CLAIM-HEADER-RECORD-LT |
COT147 | COT.002.147 | MEDICARE-BENEFICIARY-IDENTIFIER | COT00002 | CLAIM-HEADER-RECORD-OT |
ELG051 | ELG.003.051 | MEDICARE-BENEFICIARY-IDENTIFIER | ELG00003 | VARIABLE-DEMOGRAPHICS-ELIGIBILITY |