Reason Code 19401
When the other physician id is present, the other physician first and last name must be present.
An entry has been made in the other physician field, but the entry is incomplete. This field must include the National Provider Identifier (NPI) and the other physician’s first and last name. Add the missing information for the Other Physician on page 3 of the claim in FISS DDE.
CMS Internet Only Manual (IOM), Publication 100-4, Medicare Claims Processing Manual.