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Medicare Beneficiary Identifier (MBI) Format Cheat Sheet by

medicare     number     beneficiary     mbi

Introd­uction

The MBI has 11 charac­ters, like the Health Insurance Claim Number (HICN), which can have up to 11.

Each MBI is randomly generated. This makes MBIs different than HICNs, which are based on the Social Security Numbers (SSNs) of people with Medicare. The MBI’s characters are “non-i­nte­lli­gent” so they don’t have any hidden or special meaning.

MBIs are numbers and upper-case letters. We’ll use numbers 0-9 and all letters from A to Z, except for S, L, O, I, B, and Z. This will help the characters be easier to read.

MBIs will fit on forms the same way HICNs do. You don’t need spaces for dashes.

Each person with Medicare will get their own random­ly-­gen­erated MBI. Spouses or dependents who may have had similar HICNs will each get their own different MBI.

MBI Look on New Card

MBI will contain letters and numbers. Here’s an example: 1EG4-T­E5-MK73
• The MBI’s 2nd, 5th, 8th, and 9th characters will always be a letter.
• Characters 1, 4, 7, 10, and 11 will always be a number.
• The 3rd and 6th characters will be a letter or a number.
• The dashes aren’t used as part of the MBI. They won’t be entered into computer systems or used in file formats.
 

MBI Format

Where will the MBI’s characters go?
C – Numeric 1 thru 9
N – 0 thru 9
AN – Either A or N
A – Alphabetic Character (A...Z); Excluding (S, L, O, I, B, Z)

MBI Format

Posi­tion
Cont­ent
1
numeric values 0 thru 9
2
alphabetic values A thru Z (minus S, L, O, I, B, Z)
3
alpha-­numeric values 0 thru 9 and A thru Z (minus S, L, O, I, B, Z)
4
numeric values 0 thru 9
5
alphabetic values A thru Z (minus S, L, O, I, B, Z)
6
alpha-­numeric values 0 thru 9 and A thru Z (minus S, L, O, I, B, Z)
7
numeric values 0 thru 9
8
alphabetic values A thru Z (minus S, L, O, I, B, Z)
9
alphabetic values A thru Z (minus S, L, O, I, B, Z)
10
numeric values 0 thru 9
11
numeric values 0 thru 9

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