A committee member provided the following comment:
As noted below, this is not a separate language, and doesn't have a language code. Contribute at Italian Wikipedia, Lombard Wikipedia, or go to SIL and try to get a language code. For LangCom: StevenJ81 (talk) 15:49, 11 September 2019 (UTC)
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You need a ISO 639-3 code; something like it-sui is only usable after SIL has been asked for an ISO 639-3 code and been rejected, and the Language Committee agrees that it is a distinct language. The Lombard Wikipedia exists, and w:en:Swiss Italian and w:en:Lombard language agree that the dialect/version of Italian spoken in Switzerland, when considered separately from Italian, is called Lombard.--Prosfilaes (talk) 22:11, 5 August 2019 (UTC)
In Switzerland people speak either Italian or Lombard or both, but "Swiss Italian" is not Lombard. Swiss Italian is just Italian, with some (very few) difference in lexicon, and totally no difference in grammar nor in orthography. So Swiss Italian is not a different language, not even a dialect/variant of Italian language, it's just a bunch of words and expressions that people use while speaking Italian that are not used in the standard language, and some accent in pronouncing the language, a kind of difference that exist between almost every province of Italy. Lombard language has nothing to do with Swiss Italian, the version of the Lombard language that people speak in Switzerland is a northern variant of the language spoken in Milano, or "Western Lombard", and is a separate language from Italian. --Phyrexianɸ 01:46, 26 August 2019 (UTC)
Oppose, of course. How many times have we gone through this already? No separate Wikipedias for British and American (and Canadian, Indian, Australian etc.) English. No separate Wikipedias for Castilian, Mexican, and Argentinian Spanish. No separate Wikipedias for metropolitan, Canadian, Belgian, and Swiss French. No separate Wikipedias for European and Brazilian Portuguese. No separate Wikipedias for German, Austrian, and Swiss German. No separate Wikipedias for Dutch and Flemish. No separate Wikipedias for Romanian and Moldovan. Separate Wikipedias for Serbian, Croatian, and Bosnian all right, but only because their speakers won't work together in the wake of the Yugaslav wars. So again: no separate Wikipedias for Italian Italian and Swiss Italian, two very slightly different standards of the same language. If, by chance, you meant the Lombard dialects of Switzerland rather than Swiss Italian, you're more than welcome at the Lombard Wikipedia. Steinbach (formerly Caesarion) 08:58, 4 September 2019 (UTC)