US · guidance
CMS Pub. 100-04, ch. 17, § 70.1.1
Reporting Modifiers in the Compound Drug Segment
Certain informational modifiers are required on compound ingredients. The NCPDP format does not
currently support reporting modifiers in the compound segment. Therefore, the narrative portion in the
prior authorization segment must be used to report these modifiers. The following must be entered in
positions 001-003 of the narrative (Example, MMN or MNF). Starting at position 355, indicate the
two-byte ingredient number followed by the two-position modifier:
MMN - Indicates that the Supporting documentation that follows is Medicare modifier information and
CMN information or DIF information
MNA - Indicates that the Supporting documentation that follows is Medicare modifier information,
CMN information or DIF information and narrative information
MFA - Indicates that the Supporting documentation that follows is Medicare modifier information,
CMN information or DIF information and Facility Name and Address
MNF - Indicates that the Supporting documentation that follows is Medicare modifier information,
CMN information or DIF information, narrative information and Facility Name and Address
MAC - Indicates that the Supporting documentation that follows is Medicare modifier information and
Facility Name and Address
MAN - Indicates that the Supporting documentation that follows is Medicare modifier information,
narrative information and Facility Name and Address
MAR - Indicates that the Supporting documentation that follows is Medicare modifier information and
narrative information
History
(Rev. 1, 10-01-03)
Provenance
- Source
- cms.gov
- Retrieved
- 2026-08-25
- Edition
- iom-2026-08-25
- Content hash
5cf9195f5f4eac4a8f7be9daec21253f2ff3375dd7603000b7f1f38eb604a2ab
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