Introduction

Modifier 57 is used when an Evaluation and Management (E/M) service results in the initial decision to perform a major surgical procedure. It tells the payer that the office visit, emergency department visit, hospital visit, or consultation was not merely a routine preoperative evaluation but was the encounter during which the physician determined that surgery was medically necessary.

This modifier is important because the E/M service may otherwise be considered part of the global surgical package. Correct use of Modifier 57 allows eligible E/M services to be reimbursed separately when they lead to the decision for major surgery.

For medical billers, coders, and AR callers, understanding Modifier 57 is essential for preventing denials, ensuring proper reimbursement, and complying with Medicare and commercial payer billing rules.

Modifier Number

Modifier Name

Decision for Surgery

Note: The official CPT® descriptor is maintained by the American Medical Association (AMA). Always refer to the latest licensed CPT® codebook for the official wording.

Plain English Explanation

Modifier 57 tells the insurance company:

“This Evaluation and Management visit is the encounter where the physician decided that the patient needs major surgery.”

Without Modifier 57, the payer may bundle the E/M visit into the surgical payment.

Purpose of Modifier 57

Modifier 57 is used to:

Identify the E/M service that resulted in the decision to perform major surgery.
Prevent inappropriate bundling of the E/M visit into the global surgical package.
Support separate reimbursement for the decision-making encounter.
Distinguish the decision-making visit from routine preoperative care.

Understanding Major Surgery

Modifier 57 generally applies to major surgical procedures, which typically have a 90-day global surgical periodunder Medicare.

Examples include:

Total knee replacement
Total hip replacement
Coronary artery bypass graft (CABG)
Open colectomy
Craniotomy
Open reduction and internal fixation (ORIF) of major fractures

Minor procedures with a 0- or 10-day global period generally do not qualify for Modifier 57.

When to Use Modifier 57

Modifier 57 may be appropriate when:

The physician performs an E/M service.
The E/M service results in the initial decision to perform major surgery.
The surgery has a 90-day global period (under Medicare rules).
The E/M service is separately documented.
The visit is medically necessary.

Common Examples

✔ Emergency department evaluation resulting in emergency surgery.

✔ Office visit where the physician determines the patient requires total hip replacement.

✔ Hospital consultation leading to urgent bowel surgery.

✔ Orthopedic consultation determining the need for open fracture repair.

When NOT to Use Modifier 57

Do not use Modifier 57 when:

The surgery is a minor procedure with a 0- or 10-day global period.
The visit is routine preoperative care after the surgical decision has already been made.
The patient is returning for standard postoperative follow-up.
The physician is simply obtaining informed consent.
Modifier 25 more accurately describes the encounter.

Medicare Rules

Under Medicare:

Modifier 57 applies to the E/M service that results in the decision for a major surgical procedure with a 90-day global period.
It is appended to the E/M code, not the surgery code.
Documentation must support that the decision for surgery occurred during the E/M visit.
Routine preoperative evaluations performed after the decision for surgery are included in the global surgical package.

Always verify the current CMS global surgery rules and Medicare Administrative Contractor (MAC) guidance.

Commercial Insurance Rules

Many commercial insurers follow Medicare principles but may have payer-specific variations.

Commercial payers may:

Require Modifier 57 on the E/M code.
Request supporting documentation.
Apply prepayment review.
Require medical necessity for both the E/M service and the surgery.

Always review payer-specific policies before billing.

Documentation Requirements

Documentation should clearly include:

Chief complaint.
History of present illness.
Physical examination.
Diagnostic findings.
Medical decision making.
Discussion of treatment options.
Documentation that surgery was recommended during the encounter.
Risks, benefits, and alternatives discussed.
Final assessment supporting the need for surgery.

The record should clearly show that the decision for surgery occurred during this visit.

Real Billing Examples

Example 1 – Emergency Department Visit

A patient presents to the emergency department with acute appendicitis.

The surgeon evaluates the patient, reviews laboratory and imaging results, confirms the diagnosis, and decides that an emergency appendectomy is required.

Coding Example

Appropriate E/M code with Modifier 57.
Appendectomy procedure code.

The E/M service qualifies because it resulted in the initial decision for surgery.

Example 2 – Orthopedic Office Visit

A patient with severe osteoarthritis is evaluated in the orthopedic clinic.

After reviewing imaging and discussing failed conservative treatment, the orthopedic surgeon recommends total knee replacement.

The surgery is scheduled for the following week.

The office visit may qualify for Modifier 57 because it is the encounter where the decision for major surgery was made.

Example 3 – Incorrect Use

A patient returns one day before scheduled surgery for routine preoperative instructions and consent.

Modifier 57 should not be reported because the decision for surgery was made during an earlier visit.

CMS-1500 Claim Example

Field	Example
CPT Code	Appropriate E/M code
Modifier	57
Diagnosis Pointer	ICD-10-CM diagnosis supporting surgery
Units	1
Charges	Provider’s billed amount

Common Denial Reasons

Surgery is a minor procedure.
Documentation does not support the decision for surgery.
Modifier applied to the procedure code instead of the E/M code.
Routine preoperative visit billed with Modifier 57.
Missing or incomplete medical records.
Payer-specific policy not followed.

How to Correct the Denial

Review the denial reason.
Verify that the surgery has a 90-day global period.
Confirm the E/M visit resulted in the decision for surgery.
Ensure Modifier 57 is attached to the E/M code.
Submit medical records if requested.
Appeal when documentation supports the service.

Coding Tips

Modifier 57 is used only on E/M services.
Verify that the procedure is classified as a major surgery.
Document the medical decision-making process thoroughly.
Do not confuse Modifier 57 with Modifier 25.
Follow payer-specific billing requirements.

Frequently Asked Questions (FAQs)

Q1. Can Modifier 57 be used with minor surgery?

Answer: Generally, no. Modifier 57 is intended for major surgical procedures with a 90-day global period under Medicare.

Q2. Where should Modifier 57 be reported?

Answer: Modifier 57 is appended to the E/M code, not the surgical procedure code.

Q3. Can Modifier 57 and Modifier 25 be used interchangeably?

Answer: No. Modifier 25 identifies a significant, separately identifiable E/M service on the same day as a procedure, while Modifier 57 identifies the E/M service that resulted in the decision for major surgery.

Q4. Does Modifier 57 guarantee payment?

Answer: No. Payment depends on documentation, medical necessity, the global surgery rules, and payer policy.

AR Caller Tips

When following up on a denied Modifier 57 claim:

Verify that the surgery has a 90-day global period.
Confirm the E/M visit documented the decision for surgery.
Ask whether the payer requires medical records.
Check whether the modifier was applied to the E/M code.
Document all payer conversations, reference numbers, and follow-up actions.

Interview Questions

Question 1

What is Modifier 57 used for?

Answer: Modifier 57 identifies the Evaluation and Management service during which the physician made the initial decision to perform a major surgical procedure.

Question 2

What type of surgery usually qualifies for Modifier 57?

Answer: Major surgery with a 90-day global period under Medicare.

Question 3

Can Modifier 57 be used for a routine preoperative visit?

Answer: No. Routine preoperative care after the decision for surgery is included in the global surgical package.

Practice Scenario

Scenario

A patient arrives in the emergency department with severe right lower quadrant abdominal pain.

The surgeon performs a comprehensive evaluation, reviews laboratory tests and a CT scan, diagnoses acute appendicitis, and determines that an emergency appendectomy is required immediately.

Question

Should Modifier 57 be considered?

Answer

Yes. The E/M service resulted in the initial decision to perform a major surgical procedure. If payer requirements are met and documentation supports the decision, Modifier 57 may be appended to the E/M code.

Related Modifiers

Modifier 24 – Unrelated E/M service during a postoperative period.
Modifier 25 – Significant, separately identifiable E/M service on the same day as a procedure.
Modifier 33 – Preventive services.
Modifier 58 – Staged or related procedure during the postoperative period.
Modifier 78 – Unplanned return to the operating room.
Modifier 79 – Unrelated procedure during the postoperative period.

Common Billing Mistakes

Using Modifier 57 for minor procedures.
Billing routine preoperative visits with Modifier 57.
Appending Modifier 57 to the surgical procedure code.
Inadequate documentation of the decision-making process.
Confusing Modifier 57 with Modifier 25.

Key Takeaways

Modifier 57 identifies the E/M service that results in the decision for major surgery.
It is reported only on the E/M code.
It generally applies to procedures with a 90-day global period.
Thorough documentation is essential.
Correct use helps prevent inappropriate bundling and supports proper reimbursement.

References

CMS Medicare Claims Processing Manual
CMS Global Surgery Booklet
National Correct Coding Initiative (NCCI) Policy Manual
Medicare Administrative Contractor (MAC) billing guidance
Current payer-specific billing policies
Licensed AMA CPT® codebook for official modifier descriptors

Conclusion

Modifier 57 is an important Evaluation and Management modifier that ensures providers are appropriately reimbursed for the visit during which the decision to perform a major surgical procedure is made. Understanding the distinction between Modifier 57, Modifier 25, and routine preoperative care is essential for accurate coding and billing. Complete documentation, proper application of global surgery rules, and adherence to payer-specific policies help reduce denials, maintain compliance, and support timely reimbursement.

Educational Disclaimer

This article was prepared with the assistance of artificial intelligence (AI) for educational and informational purposes. It is based on publicly available CMS guidance, Medicare educational resources, and general medical billing practices. It is not an official publication of the American Medical Association (AMA), CMS, or any insurance payer. CPT® is a registered trademark of the American Medical Association. Always consult the latest AMA CPT® codebook, CMS manuals, Medicare Administrative Contractor (MAC) guidance, National Correct Coding Initiative (NCCI) policies, and payer-specific billing policies before coding, billing, or submitting claims.cc