also: すみ
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済む is the conjugating verb meaning 'to be finished/settled', whereas 済み is its noun/suffix form attached directly to nouns like 確認済み.
used; spent
registered; already registered
resolved; settled
finished with; no longer needed; having served its purpose
listed; already viewed
acknowledged; accepted; agreed
accepted; understood; already agreed
reserved; booked; already taken
Standard suffix form; the reading ずみ is used when attached to a noun.
Rare standalone reading; the suffix is normally read ずみ.
Irregular okurigana usage; less common than 済み.
Derived from the verb 済む (すむ, 'to finish, be settled'), with the suffix form undergoing rendaku to ずみ.
processed; already handled
built-in; predefined