-24

Modifier -24: Unrelated E/M by same provider during a postoperative period

Quick reference

• Definition (Medicare global-surgery context): Modifier -24 indicates an unrelated E/M service by the same provider during the post-operative (global) period of another procedure.
• When it starts (MAC guidance): An unrelated E/M service is performed beginning the day after the procedure by the same physician during the 10- or 90-day post-op period.
• Where it goes: Append -24 to the E/M code (office/outpatient E/M, inpatient E/M, eye exam codes if your payer allows).
• Key idea: -24 is for an E/M visit unrelated to the original procedure’s diagnosis, not routine post-op care.

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Medicare rules (high-yield)

• CMS explains that the global surgical package includes routine post-op care, and to bill an unrelated E/M during the post-op period, you use modifier -24.
• CMS also states that the provider must document the E/M billed with modifier -24 and must send documentation supporting the unrelated service (upon request/when needed).
• If a significant, separately identifiable E/M occurs on the same day as another procedure, that same-day separation is handled with modifier -25—and CMS notes you may use both -24 and -25 when the significant, separately identifiable E/M on the procedure day falls within the post-op period of another unrelated procedure.

What -24 is not

• -24 is not for routine post-op checks, suture removal, dressing changes, or other typical recovery care that’s included in the global package.
• -24 is not the right tool for an unplanned return to the OR/procedure room for a related problem; CMS points to modifier -78 for procedures done during a return-to-OR/procedure-room session.
• -24 is not the modifier for an unrelated procedure during the global period (that is modifier -79 on the procedure code).

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Documentation template (copy/paste)

Goal: make it obvious the E/M is unrelated to the index surgery and not routine post-op care.

Required elements

• Identify index procedure + dates: “Patient is in post-op global for: CPT _____ on (DOS) _____.”
• State unrelated reason for visit: “Today’s visit is for: _____ (new/unrelated complaint/condition).”
• Separate assessment/plan: Document a full problem-oriented A/P for the unrelated issue (or time-based documentation if using time), and keep routine post-op discussion clearly separate.
• Diagnosis clarity: Choose ICD-10-CM that supports the unrelated condition being treated (this helps show unrelatedness, but the chart narrative is still key).

Provider-facing wording options

• “E/M today is unrelated to the post-op care of the prior surgery; evaluated/managed _______. Append -24 to the E/M.”
• “Post-op global period is active for prior surgery; today’s E/M addressed _______ with separate management plan (med changes/orders/referrals).”

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Ophthalmology + ENT examples (common patterns)

Ophthalmology

• Patient is in global period after an eyelid procedure and returns for a separate, unrelated condition (e.g., allergic conjunctivitis management) with its own A/P → bill the E/M with -24 (assuming it is truly unrelated and documented as such).
• If, during the same encounter, you also perform a minor procedure and the E/M is significant/separately identifiable, CMS allows the E/M to carry -25, and if the date is also inside a different procedure’s global for an unrelated surgery, CMS describes using -24 and -25 together on the E/M.

ENT

• Patient is in post-op global after a nasal procedure and returns for an unrelated problem visit (e.g., acute otitis externa management) with separate exam/MDM and plan → E/M with -24 when documentation supports unrelatedness.
• If the visit is for normal post-op care (expected congestion, packing removal, wound check) that is part of recovery, it stays bundled and should not be carved out with -24.

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Pitfalls (high-denial)

• “Unrelated” not proven: If the note reads like post-op management (pain control, wound care, expected symptoms), -24 is weak and may be denied as bundled post-op care.
• Using -24 on the day of surgery: MAC guidance emphasizes -24 is for unrelated E/M services beginning the day after the procedure (same-day scenarios are usually -25 logic).
• Mixing up -24 vs -79: -24 is for E/M services; unrelated procedures during the global use -79.
• Complication confusion: If a related post-op complication requires a return to the OR/procedure room, CMS points to -78 for the procedure performed during that return session, not -24 to “force pay” a post-op visit.