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Modifiers communicate why a code is valid despite edits: separate services, distinct procedures, professional/technical components, laterality, etc.
Common traps: using a modifier to “force payment” without documentation, confusing -25 vs -59, and mixing -TC/-26 incorrectly.
Worked example (mini): Same day: patient has an office visit for new symptoms + a minor procedure. If E/M is significant and separately identifiable beyond the procedure’s pre/post work → E/M + modifier -25.
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