Is there a lookup table where I can find the names of repackaging or drug manufacturing companies with companynumb reported in the field companynumb? e.g. "companynumb": "200501050" Thanks
According to the field-by-field reference page for the drug events API, "companynumb" is a self-assigned identifier. And I don't know of any lookup table that would enable you to decode a "companynumb".
In some cases, "companynumb" includes the name of company, but not in all cases.
See for example: https://api.fda.gov/drug/event.json?count=companynumb.exact