In healthcare revenue cycle management, one miscoded modifier can silently bundle a billable E/M visit into the global surgical package that can cost your practice significant reimbursement. According to the American Academy of Professional Coders (AAPC), Modifier 57 is one of the most misapplied modifiers that is used with the surgical claims. At the same time, this modifier is one of the most impactful when it is used in the correct way. It is officially known as the decision for surgery modifier. It works through the CPT code that the physician made the initial decision to perform a major procedure during the associated E/M visit.
Having a clear Modifier 57 definition, correct usage guidelines, and denial prevention rules is important before submitting any surgical claim. This guide covers everything, including the real-world Modifier 57 examples, CMS compliance, and denial prevention.
What Is Modifier 57 in Medical Billing?
Modifier 57 in medical billing is attached specifically to an Evaluation and Management (E/M) CPT code when that visit results in the initial decision to perform a major procedure (surgical or non-surgical). Major procedures, as defined by the CMS, are those that have a 90-day global period; therefore, making the Modifier 57 global period rule the most critical criterion for correct application.
If a major procedure is performed but does not have the corresponding Modifier 57 CPT code on the associated E/M prior to the performance of the procedure, the payer will assume that the visit was routine, pre-operatively, and considered part of the global surgical package; as a result, the payer will reimburse the E/M at a value of zero.
For a broader understanding of how bundling works across procedures, read our complete guide to medical billing services and bundling rules.
Key Rules at a Glance:
- The E/M code should have the modifier added (e.g., 99284-57) and should not be added to the surgical code.
- Modifier 57 is a modifier with a 90-day global period regardless of whether the procedure is surgical or non-surgical.
- The initial surgical decision must have been made during the E/M visit on the date of surgery or the day preceding it
- Initial claims will not require documentation to be submitted; only documentation will need to be submitted if requested by the payer.
Modifier 57 Examples: Real-World CPT Coding Scenarios
The following Modifier 57 examples illustrate correct CPT coding across surgical and non-surgical major procedures. Each scenario confirms that the E/M was the encounter that led to the initial decision to operate.
For a full breakdown of how E/M visits are structured and leveled, see our medical coding services resource.
Example 1 — Emergency Appendectomy
A patient with an acute abdomen arrives in the emergency room with a fever. An evaluating surgeon makes the diagnosis of acute appendicitis and decides to perform an emergency appendectomy (CPT 44950) on his patient. As the emergency room visit (E/M) generated the initial surgical decision and the procedure has a global period of 90 days, the E/M should be billed with Modifier 57 attached. For practices managing high-volume surgical billing, see our general surgery billing services.
Example 2 — Emergency Hysterectomy
A woman arrives at a healthcare facility one week after giving birth with an episode of abnormal vaginal bleeding. The doctor assessed that the woman was suffering from post-natal bleeding; the doctor has determined that, in her case, the safest treatment option is an emergency hysterectomy (CPT 58150). The E/M performed by the physician was the basis for initiating the major 90-day global surgical procedure. For specialty-specific billing support, visit our OB-GYN billing services.
Example 3 — Non-Surgical Fracture Care (Major Procedure)
CPT code 23500, closed treatment of clavicle fracture without manipulation, is considered a major procedure, although it is performed non-operatively. The global period for this procedure is 90 days. A major procedure is indicated by the E/M service prior to the procedure, which should be billed with Modifier 57. Thus, the correct billing for this visit is 99205-57 | 23500.
When to Use Modifier 57: Billing Rules and Correct Application
Correct Modifier 57 application depends on two factors: the clinical trigger that qualifies the E/M visit, and the hard limits that disqualify it. Both are governed by CMS and apply consistently across Medicare, Medicaid, and most commercial payers. Knowing how and when to apply Modifier 57 requires understanding both the triggers and “hard limits” related to the use of Modifier 57. If your claims are being denied repeatedly, our denial management services walk through the full resolution workflow.
Apply Modifier 57 When:
- An encounter where the physician makes the initial decision to perform a major surgical procedure, which falls under the 90-day global period, and the E/M documentation captures the initial decision.
- The E/M documentation and the date of the clinical encounter must occur either on the same day as the surgery or on the date of the surgery.
- An E/M clinical encounter must provide clinical findings that relate to the unplanned surgery.
- E/M documentation must also demonstrate that the medical decision-making process is more than a routine pre-surgical consultation.
Common Modifier 57 Denial Reasons — Do Not Apply When:
- The procedure has a 0 or 10 global day period (minor procedure), in these cases, Modifier 25 should be used.
- The Modifier is applied to the surgical procedure code rather than the E/M.
- Surgery has been pre-planned/staged before this E/M encounter.
- Surgery is scheduled to occur more than one day after the E/M encounter.
Top Denial Alert: Appending Modifier 57 to the surgical procedure code instead of the E/M code is the most frequently cited billing error across Medicare Administrative Contractors (MACs). Always attach it exclusively to the E/M CPT code.
Modifier 57 vs Modifier 25: Key Differences Every Coder Must Know
The Modifier 57 vs Modifier 25 is perhaps the most difficult comparison between surgical E/M codes and the two modifiers used to denote E/M codes. Although both modifiers denote E/M services (i.e., evaluation and management) and can be used to modify E/M services, they are based on different clinical triggers and have different global periods.
| Criteria | Modifier 57 | Modifier 25 |
| Official Name | Decision for Surgery | Significant, Separately Identifiable E/M |
| Appended To | E/M code only | E/M code only |
| Clinical Trigger | E/M results in the initial decision for a major procedure | E/M is separate and unrelated to a minor same-day procedure |
| Procedure Global Period | 90-day global (major) | 0- or 10-day global (minor) |
| Timing | Day of or day before major surgery | Same day as the minor procedure |
| E/M Relationship | Drives the surgical decision | Unrelated to the minor procedure |
| Example CPT Pair | 99284-57 + 44950 | 99213-25 + 11100 |
Thus, mixing up the two will result in compliance problems that ultimately lead to claims being denied. For a complete breakdown of Modifier 25 rules, examples, and payer guidelines, visit our dedicated Modifier 25 billing guide.
The rule is simple: use Modifier 57 for major 90-day global procedures and Modifier 25 for minor ones. Swapping them is a leading compliance violation and a primary cause of claim denial.
Modifier 57 Documentation Requirements for Clean Claims
For Modifier 57 documentation requirements to protect your practice during payer medical audit reviews and to impact Modifier 57 reimbursement outcomes, documentation is not required by the Centers for Medicare and Medicaid Services (CMS) as part of the initial submission; however, documentation of full clinical justification is required if the claim is referred for review.
Most post-payment recoupments for claims using Modifier 57 for Medicare and commercial insurers result from physician clinical notes that are vague or incomplete regarding the medical necessity supporting a procedure.
Clinical notes with either a lack of detail or ambiguous detail cause the majority of post-payment recoupments on Modifier 57 claims in Medicare and commercial insurers. To understand how the 90-day global period affects documentation across all major procedures, refer to our global surgical package explained guide.
Your clinical note for the qualifying E/M visit must contain the following:
- Clearly documented chief complaint and history of present illness.
- Clearly documented physical examination findings supporting the surgical indication.
- Clearly documented evidence in the MDM that the physician made a decision regarding the procedure to be performed.
- Clearly documented that the decision was made during the current E/M visit, as opposed to a future scheduled/pre-scheduled visit.
- Clearly documented evidence supporting the medical necessity of the procedure (e.g., imaging, lab results, acute diagnosis).
- Date of service demonstrating that the E/M occurred on the same day or the day prior to the procedure.
- Name of the attending physician and his/her respective credentials and NPI.
Modifier 57 CMS Guidelines and Payer-Specific Billing Rules
The principles of identifying a major medical procedure with a 90-day global period that is defined by the CMS guidelines for Modifier 57 apply to both surgical and non-surgical procedures.
Medicare (CMS):
Medicare (CMS) applies Modifier 57 when the procedure carries a 90-day global period and does not require supporting documentation at initial submission. According to Novitas Solutions and Noridian, the E&M must also occur on the same day or prior to the surgery date.
Medicaid:
Eligibility is state-specific. While most programs follow standard CMS criteria, some states restrict billing to specific service types or mandate prior authorization. Always verify coverage and application rules with your local state MAC before submitting claims.
Commercial Payers:
Most align strictly with CMS policy for Modifier 57. However, contract parameters vary; review each payer contract independently to ensure unique documentation timelines are satisfied.
Medicare Advantage:
Medicare Advantage does generally follow CMS guidelines for the approval of modifiers and procedures; there could also be additional pre-authorization guidelines in each Medicare Advantage sub-plan that will affect the processing of claims in that manner as well.
Conclusion
Modifier 57, the decision for surgery modifier, allows separate reimbursement for the E/M visit. In this, a physician first ascertains that a major 90-day global procedure is medically necessary. Using it correctly demands strict compliance with Modifier 57 usage guidelines: add exclusively to the E/M code, only for 90-day global procedures, and only when the encounter occurs on the day of or the day before surgery.
Always bill minor procedures that have a zero- or ten-day global period when Modifier 25 applies. Consistently following Modifier 57 billing guidelines and providing sufficient documentation to support the medical necessity of every claim is the best way to maintain protected revenue, minimize denials, and comply with various types of payers.
Frequently Asked Questions
Can Modifier 57 be used with CPT 99223?
Yes. Absolutely. When a patient is admitted for evaluation at the initial visit with CPT 99223 (high-complexity initial hospital inpatient or observation care), and at that time it is determined that an emergency major surgical procedure is immediately necessary and will require a 90-day global period, it will qualify for billing with Modifier 57.
Can Modifier 24 and Modifier 57 be billed together?
In most situations, no. Modifier 24 deals only with an unrelated E/M service performed during the global period (the 90 days) after a procedure; Modifier 57 deals specifically with pre-surgical decision-making. Billing of both modifiers on an E/M encounter demonstrates divergent clinical scenarios and/or actual conflict and will most likely result in the denial of both modifiers.
Does Modifier 57 apply to non-surgical procedures?
Yes, and this is widely misunderstood. The CPT manual states that Modifier 57 applies when a physician decides any “major” procedure is necessary, and CMS defines major as any procedure with a 90-day global period, surgical or non-surgical. Closed treatment of a clavicle fracture (CPT 23500) qualifies even though no surgery is performed.
Is Modifier 57 valid for Medicaid claims?
In general, there are different guidelines for different states with respect to the use of Modifier 57 and the CMS Medicare rules for billing them. Most State Medicaid programs follow the CMS Medicare guidelines, which generally include the use of Modifier 57 for certain E/M services that resulted in a major procedure with a global 90-day period. However, some states restrict the types of procedures that can be billed with Modifier 57 or require additional documentation. It is important to check with the state MAC prior to billing any claims.
What is the difference between Modifier 25 and Modifier 57?
Modifier 57 is applicable when reporting E/M codes for major procedures that have a 90-day global period, and the qualifying E&M must be performed on either the same day as or the previous day to the date of surgery. Modifier 25 is applicable when reporting a minor procedure with a 0 or 10-day global period, and when E/M and the procedure are performed on the same date of service. The inappropriate use or application of these two modifiers is the most common reason for claim denials and an OIG compliance flag.
