Modifier 24 vs 25 vs 57: E/M Modifier Decision Guide + Examples
Modifiers 24, 25, and 57 all affect E/M services around procedures, yet each answers a different billing question. Confusing them can turn legitimate physician work into a denial, duplicate payment risk, or audit problem. Coders working in professional-fee coding, preparing for medical coding interview tests, reviewing coding denials, or building stronger CPT coding skills need to know exactly when the E/M work stands apart from the procedure or global surgical package.
1. Use One Decision Question to Separate Modifier 24, 25, and 57
All three modifiers belong on an E/M service, but the timing and reason for the encounter determine which one applies.
Use this three-question sequence:
Is the patient already inside a postoperative global period for a previous surgery?
If yes, and today's E/M service is genuinely unrelated to the original surgery, consider modifier 24.
Did the provider perform a procedure today, while also performing significant E/M work beyond the work inherent in that procedure?
If yes, consider modifier 25, especially with a minor procedure or another service for which separately identifiable E/M work is permitted.
Did today's or yesterday's E/M service produce the initial decision to perform a major surgery with a 90-day Medicare global period?
If yes, consider modifier 57.
That framework matters far more than memorizing three short definitions. Coders handling outpatient coding, working under coding productivity standards, preparing a medical coder resume, or moving toward a coding auditor career need to be able to defend why the E/M service deserves separate payment.
Modifier 24: unrelated E/M during a postoperative period
Modifier 24 applies when the same physician or qualified professional performs an E/M service during the postoperative period and the visit is unrelated to the original surgery. Medicare requires documentation sufficient to establish that separation. A clearly unrelated diagnosis can help demonstrate why today's visit falls outside the surgical package.
Suppose a surgeon performed a major abdominal operation, and during the global period the patient returns to that same physician for evaluation of a newly developed unrelated skin condition. If the E/M service is medically necessary and genuinely independent of the postoperative care, modifier 24 may be appropriate.
The key word is unrelated. Routine wound checks, expected recovery, postoperative pain management, dressing changes, and treatment of complications related to the surgery generally remain part of the global package under Medicare rules. That makes modifier 24 particularly important in professional-fee coding, denial prevention, physician reimbursement analysis, and coding audit work.
Modifier 25: separately identifiable E/M on the same day as a procedure
Modifier 25 addresses same-day work. The E/M service must be significant and separately identifiable from the work normally included in the procedure.
For Medicare, the decision to perform a minor procedure with a 000- or 010-day global period is generally included in the procedure payment. A new patient visit does not automatically create a separately billable E/M service. The record must demonstrate additional medically necessary evaluation or management beyond the usual procedure-related work.
This is one of the biggest trouble spots in CPT coding, medical billing concepts, coding interview assessments, and claim denial management.
A different diagnosis is not automatically required for modifier 25. The same condition may prompt both the E/M service and the procedure, provided the E/M work genuinely exceeds the work inherent in performing that procedure. CMS explicitly recognizes that the E/M and minor procedure can share the same diagnosis.
Modifier 57: the E/M created the initial decision for major surgery
Modifier 57 applies to an E/M service that results in the initial decision to perform major surgery. Under Medicare, major procedures carry a 090 global indicator, meaning a one-day preoperative period and 90-day postoperative period are included in the surgical payment.
The decision-making E/M service on the day before or day of the major surgery is separately payable when properly reported with modifier 57.
Modifier 57 should therefore appear frequently in surgical professional-fee coding, but its use depends on the global status of the planned surgery. Coders preparing through CPC exam questions, CPC study strategies, medical terminology training, and coding interview tests should train themselves to check the global indicator before choosing 57.
Modifier 24 vs 25 vs 57: 30-Scenario Decision Table
Use this table as a decision aid. Always verify the procedure's current global indicator, payer rules, documentation, and whether the E/M service independently meets reporting requirements.
| Scenario | Likely Decision | Why | Common Error |
|---|---|---|---|
| Unrelated hypertension visit during surgical global period | 24 | Unrelated E/M during postoperative period | Leaving 24 off the E/M |
| Routine postoperative wound check | No 24 | Related postoperative care | Billing routine global care separately |
| Postoperative pain related to surgery | No 24 | Related to original surgery | Calling every new complaint unrelated |
| New unrelated dermatitis during 90-day global | 24 | Separate condition from surgery | Assuming all global-period visits are bundled |
| Routine suture removal during global | No 24 | Expected postoperative management | Reporting unrelated E/M modifier |
| Unrelated diabetes management during postop period | 24 | Separate medical problem | Failing to establish unrelatedness |
| Same physician evaluates unrelated migraine during global period | 24 | Independent E/M reason | Using 25 because an E/M occurred |
| Different physician manages chronic heart disease after another surgeon's procedure | Usually no 24 | 24 is generally relevant to same physician/global relationship | Appending 24 automatically |
| Minor procedure after routine focused pre-procedure evaluation | No 25 | Usual procedural work is included | Billing every procedure-day E/M |
| Minor procedure plus separate chronic-disease management | 25 | Separate significant E/M work | Failing to document independent management |
| New patient seen and minor procedure performed immediately | Depends | New status alone does not justify 25 | Using new-patient status as proof |
| Procedure plus extensive evaluation of another complaint | 25 | Separate medically necessary E/M | Omitting 25 and losing valid E/M payment |
| Procedure and E/M share same diagnosis | 25 may still apply | Different diagnosis is not mandatory | Assuming diagnosis must differ |
| Only decision is whether to perform minor surgery | No 25 | Decision is normally inherent in minor procedure | Using 25 to bill decision work |
| Diagnostic test plus unrelated disease management | 25 may apply | Separate E/M may exist | Assuming procedure automatically eliminates E/M |
| Minor procedure with only consent and local exam | No 25 | Work is inherent to procedure | Treating consent as separate E/M work |
| Injection plus substantive management of another disease | 25 may apply | Separate E/M work may be supportable | Appending 25 without evidence |
| Same-day procedure after separately identifiable medication-management visit | 25 may apply | Additional E/M work beyond procedure | Failing to separate documentation |
| Decision today to perform 90-day-global surgery today | 57 | Initial decision for major surgery | Using 25 instead |
| Decision one day before 90-day-global surgery | 57 | Covered decision window for major surgery | Assuming only same-day decisions qualify |
| Decision to perform 10-day-global minor surgery | No 57 | 57 is not for minor surgery | Confusing surgical significance with global indicator |
| Routine pre-op visit after surgery was already scheduled | No 57 | Initial decision already occurred | Using 57 on every pre-op E/M |
| Surgeon evaluates acute condition and immediately decides major surgery | 57 | E/M produced decision | Bundling valid decision-making visit |
| Established surgical plan confirmed at routine pre-op check | No 57 | No initial decision occurred | Treating confirmation as decision |
| Major surgery follows consult several days later | 57 depends on timing/payer rule | Medicare decision rule focuses day before/day of surgery | Ignoring payer and timing requirements |
| E/M and 90-day surgery same day, but surgery was decided last week | No 57 for today's routine pre-op work | Today's E/M did not create initial decision | Using 57 because major surgery occurred |
| Post-op unrelated E/M plus new minor procedure | Potentially 24 and/or 25 based on distinct services | Each service must satisfy its own rules | Stacking modifiers without analysis |
| Related postop complication evaluated without return to OR | Usually no 24 | Related complication care is generally global | Calling complication unrelated |
| Unrelated E/M during 10-day postoperative period | 24 may apply | Unrelatedness matters, not just global length | Thinking 24 only applies to 90-day globals |
| Major surgery decision plus unrelated separately identifiable E/M issue | Review full circumstances carefully | Modifiers must correspond to actual E/M purpose | Choosing modifier from procedure alone |
2. Apply Modifier 24 Only When the Postoperative E/M Is Truly Unrelated
Modifier 24 begins with a timeline question: Is the patient inside the postoperative global period of a previous procedure performed by this physician?
Medicare assigns global indicators such as 000, 010, and 090 to many surgical services. A 090 procedure includes a one-day preoperative period plus 90 postoperative days; 010 covers a 10-day postoperative period, while 000 primarily includes the procedure-day global work. Understanding those periods is fundamental to professional-fee coding, physician reimbursement, CPT coding, and denial management.
Then ask whether today's problem relates to the surgery.
Example 1: Modifier 24 is appropriate
A patient undergoes major orthopedic surgery. Four weeks later, during the 90-day global period, the same physician evaluates a new unrelated gastrointestinal complaint and performs a medically necessary E/M service.
Decision: The E/M may qualify for modifier 24 if documentation establishes that the problem is unrelated to the operation.
The record should make the relationship obvious. State the current complaint, evaluation, medical decision making, treatment, and diagnosis. The documentation should allow an auditor reviewing the claim months later to understand why this visit falls outside the global package.
This evidentiary approach matters when working with medical coding audits, correcting insurance denials, interpreting claim adjustment reason codes, or building stronger professional-fee coding skills.
Example 2: Modifier 24 should generally stay off
The same orthopedic patient returns because the surgical incision is tender and healing slower than expected.
Decision: The visit is related to the surgery. Modifier 24 does not convert related postoperative care into a separately payable unrelated E/M service. CMS includes postoperative E/M services related to recovery and surgery-related complications within the global package under its general global surgery rules.
That distinction creates frequent problems when coding teams work under aggressive productivity quotas. The faster the queue moves, the easier it becomes to see “new complaint” and append 24 without determining whether the complaint is causally related to the original surgery.
What if another physician sees the patient?
Medicare's Claims Processing Manual explains that when a physician other than the surgeon manages an underlying condition or medical complication during the postoperative period, the physician generally reports the appropriate E/M service without modifier 24.
This is a valuable distinction for coders moving between facility and professional-fee coding, inpatient and outpatient environments, coding auditor roles, and specialty coding positions.
The modifier is solving a global-payment relationship problem, so knowing who performed the original procedure matters.
3. Use Modifier 25 When the Same-Day E/M Goes Beyond the Procedure's Built-In Work
Modifier 25 is probably the easiest of the three to overuse because a provider can legitimately perform an E/M service and procedure during the same encounter, yet that does not make both separately payable.
The practical test is:
If you removed the procedure from today's encounter, would the remaining documentation still support a meaningful, medically necessary E/M service?
If the answer is yes, modifier 25 may be supportable.
If the remaining record consists mainly of confirming the procedure indication, obtaining consent, performing the usual examination needed for the procedure, and routine immediate aftercare, the E/M work may already be included in the procedure.
CMS's 2026 NCCI guidance states that the decision to perform a minor procedure with a 000- or 010-day global period is generally included in payment for that minor procedure. A significant E/M service beyond that work can be separately reported with modifier 25.
This issue deserves special attention in CPC exam preparation, CPT study, medical coding interview preparation, and coding resume development.
Example 3: Minor procedure with no separately identifiable E/M
A patient arrives specifically for removal of a previously evaluated lesion. The physician briefly rechecks the lesion, confirms the treatment plan, obtains consent, performs the minor procedure, and provides routine instructions.
Decision: Do not automatically bill a separate E/M with modifier 25. The work described is closely tied to the procedure.
Example 4: Same procedure, but significant additional management
A patient presents because of several changing skin lesions. The physician evaluates multiple lesions, assesses a separate inflammatory skin disorder, reviews treatment response, changes prescription therapy, and removes one lesion during the same encounter.
Decision: A separate E/M service with modifier 25 may be supportable when the documentation and selected E/M level reflect the distinct work.
A separate diagnosis can make the distinction easy to see, but Medicare does not require a different diagnosis for modifier 25 when the same condition legitimately produces separately identifiable work.
That point matters when coders are correcting claim denials, researching CARCs, evaluating physician reimbursement, or preparing for a coding audit role. A diagnosis mismatch rule invented by internal habit can be just as damaging as indiscriminate modifier use.
The “new patient” trap
Seeing a patient for the first time does not automatically justify modifier 25.
CMS specifically states that new-patient status by itself is insufficient to justify reporting a separate E/M service on the same date as a minor surgical procedure.
The provider may need considerable work to understand the patient, yet separate payment still depends on whether that E/M work exceeds what is inherent to the procedure.
This is exactly the kind of nuance candidates miss when relying on memorization instead of reasoning during CPC preparation, medical coding practice, coding interview tests, and early professional-fee coding.
CMS continued emphasizing modifier-25 compliance in 2026 after improper E/M billing was identified around same-day intravitreal injections. CMS reminded providers that the E/M must be significant and separately identifiable rather than simply part of the decision to perform the minor procedure.
4. Reserve Modifier 57 for the Initial Decision to Perform Major Surgery
Modifier 57 solves a very specific payment problem.
A Medicare major surgery with a 090 global indicator includes one preoperative day in the global package. Without a separate rule, the E/M visit that causes the physician to decide surgery is necessary could disappear into that package.
CMS therefore permits the E/M service that results in the initial decision for major surgery to be reported separately with modifier 57 when it occurs on the day before or day of surgery.
This makes three facts essential:
The surgery must qualify as major under the applicable global rules.
Under Medicare, 090 identifies major surgery.
The E/M must produce the initial decision.
A routine pre-op clearance or visit after the surgical plan already exists does not become a decision-for-surgery encounter merely because it happens close to surgery.
Timing matters.
Medicare's global-surgery guidance specifically addresses the day before and day of major surgery.
These distinctions belong in every serious CPT coding study plan, professional-fee coding workflow, coding-audit process, and denial-management system.
Example 5: Emergency evaluation leads immediately to major surgery
A patient presents with severe abdominal symptoms. The surgeon performs a comprehensive evaluation, reviews imaging, determines that immediate major surgery is required, and takes the patient to surgery that day. The surgical procedure has a 090 Medicare global period.
Decision: Report the supported E/M service with modifier 57 when payer requirements are satisfied.
Today's E/M is not merely generic preoperative work. It created the initial surgical decision.
Example 6: Surgery was decided earlier
A patient had a surgical consultation two weeks ago, agreed to the operation, and was scheduled. The day before surgery, the surgeon performs a routine pre-op visit to confirm readiness.
Decision: The routine visit does not become a modifier-57 service simply because it occurs within the major surgery's preoperative window. The initial decision occurred earlier.
That distinction prevents revenue-cycle teams from confusing timing with purpose. A visit can occur one day before surgery without being the decision-for-surgery service.
Coders working with physician reimbursement, electronic claims, claim adjustment codes, or insurance denials should preserve documentation showing exactly where the surgical decision occurred.
Why modifier 57 should not replace modifier 25 for minor surgery
CMS explicitly distinguishes the two. The decision to perform a minor procedure with a 000- or 010-day global period is generally inherent to the minor procedure. Modifier 57 is reserved for major surgery under Medicare's global rules.
If additional same-day E/M work beyond the minor procedure exists, modifier 25 is the modifier to evaluate.
That creates one of the cleanest memory rules in the entire topic:
Minor procedure + separate E/M → think 25.
Major surgery + initial decision → think 57.
Postoperative global + unrelated E/M → think 24.
5. Audit Documentation, Global Indicators, and Denials Before Adding Any Modifier
The most reliable modifier workflow starts before claim submission.
Check the global indicator first
Do not decide between 25 and 57 by asking whether the procedure “feels major.”
Look up the procedure's applicable global status. Medicare recognizes indicators including 000, 010, 090, XXX, YYY, ZZZ, and MMM, each of which affects how global surgery logic applies.
This single step prevents a large category of modifier errors and strengthens CPT coding accuracy, professional-fee coding, coding productivity, and eventual audit performance.
Identify what E/M work remains after procedure-related work is removed
For modifier 25, mentally subtract the usual pre-procedure, intra-procedure, and immediate post-procedure work.
What remains?
If the answer includes independent history, evaluation, problem assessment, data review, medication management, or other supported medical decision making beyond the procedure's inherent work, a separate E/M may be defensible.
If almost nothing remains, appending 25 because “the provider did an exam” exposes the claim to denial and audit risk.
This distinction can directly affect claim denials, CARC-driven adjustments, billing workflows, and physician reimbursement.
Identify the relationship to prior surgery
For modifier 24, ask:
What surgery created the current global period?
Who performed it?
What problem is being evaluated today?
Is today's condition causally related to the surgery or recovery?
Is the visit routine postoperative management?
Is the diagnosis clearly unrelated?
Does the documentation make that separation defensible?
A short phrase such as “unrelated problem” cannot rescue documentation that otherwise shows a surgical complication.
Find the actual decision point for modifier 57
Look for the clinical moment when the provider concludes that major surgery should be performed.
The documentation may describe failure of conservative care, test interpretation, worsening disease, surgical risks and benefits, and the resulting plan. That is stronger evidence than a claim form carrying 57 while the note says only “proceed with previously scheduled procedure.”
This level of review should be standard for anyone working in medical coding audits, preparing for coding interview tests, building a medical coder resume, or moving toward higher-paying coding specialties.
Do not treat modifiers as denial overrides
CMS's NCCI guidance warns that NCCI-associated modifiers should be used only when the clinical circumstances genuinely support them.
That principle matters beyond 24, 25, and 57. A modifier should describe what actually happened. It should not become a generic tool for forcing two lines through an edit.
When a claim denies, review the CARC information, the payer policy, the medical record, global indicator, and the original claim before adding or changing a modifier. A strong denial-management workflow fixes the cause rather than repeatedly resubmitting a structurally weak claim through an electronic claims platform.
6. FAQs About Modifier 24 vs 25 vs 57
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Think in terms of timing and purpose.
Modifier 24: unrelated E/M during a postoperative global period.
Modifier 25: significant, separately identifiable E/M on the same day as a procedure or other service.
Modifier 57: E/M that creates the initial decision for major surgery.This distinction is foundational for professional-fee coding, CPT study, CPC exam preparation, and coding interview tests.
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No. Medicare states that the E/M service and minor procedure do not have to carry different diagnoses. The decisive issue is whether the E/M service is significant and separately identifiable from the procedure's inherent work.
A different diagnosis may make separation easier to understand, but coding teams should base the decision on documentation. This is especially important when reviewing claim denials, claim adjustment reason codes, physician reimbursement, and coding audit findings.
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For Medicare global-surgery purposes, modifier 57 is used for the initial decision to perform major surgery, associated with procedures carrying a 090 global period. CMS specifically states that it should not be used for minor surgeries with 000- or 010-day globals.
For a minor procedure, evaluate whether any separate E/M work supports modifier 25. Coders should verify the current global indicator rather than guessing from how invasive the service appears. That lookup habit improves CPT coding, CPC exam performance, professional coding accuracy, and denial prevention.
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Under Medicare's general global-surgery rules, postoperative E/M services related to recovery and complications of the surgery are included in the global package. Modifier 24 is intended for unrelated E/M services.
If a complication requires another procedure, other global-surgery modifiers such as 78 may become relevant depending on the circumstances. The coder should determine exactly what service occurred rather than applying 24 to every postoperative problem.
Understanding that boundary is important in coding audits, denial management, CPT coding, and medical billing workflows.
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No. CMS's 2026 NCCI guidance specifically states that being new to the provider does not independently justify a separately billable E/M service on the same date as a minor surgical procedure.
The record still needs to demonstrate significant, separately identifiable E/M work beyond the usual procedure-related services.
This is a common test point for candidates using CPC practice questions, following a CPC study plan, preparing for medical coding interviews, or entering outpatient coding.
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The modifier is intended for the E/M service that results in the initial decision to perform major surgery. If the procedure was already decided and scheduled, a later routine preoperative visit generally does not become a modifier-57 encounter merely because it occurs the day before surgery.
CMS distinguishes the decision-making E/M service from other preoperative E/M services that are included in the global payment.
Coders working with physician reimbursement, electronic claims submission, denial management, and coding audit review should locate the actual decision point in the documentation.
