CMS Pub. 100-24, ch. 3, § 3.5.1

Item Field Size Position Format Description

1 File Type

Identification,

“PROD” or

“TEST”

4 1-4 Alphabetic Identifies the file as

either a test file, “TEST,”

or a production file,

“PROD.”

2 Filler 1 5 Position reserved for

future use.

3 File Creation Date,

CCYYMMDD

8 6-13 Numeric This represents the date

on which CMS generated

the file. An eight-position numeric date

(e.g., November 1, 2019

would be 20191101).

4 Filler 59 14-72 NA Positions reserved for

future use.

5 Agency Code 3 73-75 Alpha-numeric

or

Numeric

The three-position alpha-numeric or numeric code

identifying the state

which has jurisdiction

over the account

associated with this file,

Item Field Size Position Format Description

and identifying the file as

being Part A or Part B.

6 Record

Identification Code,

“H”

1 76 Alphabetic “H” constant. The “H”

identifies this record as

the header record.

7 Filler 5 77-81 NA Positions reserved for

future use.

8 Bill Month,

CCYYMM

6 82-87 Numeric A six-position numeric

field that designates the

billing period (year and

month) for which the

response is associated.

9 Filler 73 88-160 Positions reserved for

future use.