TERMINAL DIGIT FILING SYSTEM
PURPOSE OF THE TERMINAL DIGIT FILING SYSTEM
The TDFS is used to file ITR, OTR, and X-ray film negatives. The system may
also be used to file HREC when authorized by the MTF commander.
TERMINAL DIGIT FILING SYSTEM CODES
The principle characteristic of the TDFS is the use of the SSN of the service
member involved to file records regardless of whether he is the actual patient
or is serving as sponsor for a dependent family member who is the patient.
Records are filed numerically based upon an 11-digit number obtained from the
patient's family member prefix code and the sponsor's SSN.
a. Sponsor's Social Security Number. The SSN of the service member
(sponsor) is broken into three groupings.
The first five digits are called the tertiary group.
The second two number are called the secondary group.
The last two numbers are called the primary group.
(4) If a soldier's SSN is 123-45-6789, for example, then his primary group is
89, his secondary group is 67, and his tertiary group is 12345.
b. Family Member Prefix Code. The family member prefix (FMP) code is a
two-digit code placed before the sponsor's social security number to indicate the
patient's relationship to the sponsoring service member. The FMP codes are explained
in Table 3-1.