Modifier 53- Discontinued Procedure

Identifies a surgical or diagnostic procedure that was started but discontinued due to extenuating circumstances or patient safety concerns.

What Is Modifier 53?

Modifier 53 is used when a physician or other qualified healthcare professional begins a surgical or diagnostic procedure but must discontinue it before completion because of circumstances that prevent the procedure from safely continuing.

The modifier communicates that the planned procedure was not completed even though the provider had already begun performing it.

Common situations include unexpected patient instability, an unforeseen clinical complication, or another circumstance that makes continuing the procedure unsafe.

Modifier 53 should reflect an actual discontinued procedure—not a procedure canceled before it began. CMS specifically recognizes Modifier 53 for discontinued procedures and currently requires it for applicable failed colonoscopy claims.

When to Use Modifier 53

Procedure Was Started: The physician or qualified healthcare professional began the surgical or diagnostic procedure.

Procedure Could Not Be Completed: The service was stopped before all planned components were performed.

Patient Safety Concern: Continuing the procedure could threaten the patient's health or well-being.

Extenuating Circumstances: An unexpected clinical circumstance prevented completion of the procedure.

Failed Colonoscopy: Medicare requires Modifier 53 on applicable professional claims when a covered colonoscopy is attempted but cannot be completed.

When NOT to Use Modifier 53

Procedure Never Started: Do not use Modifier 53 when the procedure was canceled before it began.

Elective Cancellation: The modifier is not intended for an elective cancellation before anesthesia induction or surgical preparation in the operating suite.

Reduced Service: Modifier 52 may be more appropriate when a service is intentionally reduced rather than unexpectedly discontinued.

Outpatient Hospital or ASC Circumstances: Modifiers 73 and 74 are used for applicable discontinued procedures reported by hospital outpatient departments and ambulatory surgical centers rather than Modifier 53.

Completed Procedure: Do not append Modifier 53 when the procedure was successfully completed.

Billing Example

A physician begins a diagnostic procedure, but the patient develops an unexpected clinical problem that makes continuing unsafe.

The physician stops the procedure before completion and documents the reason it was discontinued.

The appropriate procedure code is reported with Modifier 53 to indicate that the procedure was started but could not be completed because of the patient's clinical circumstances.

Payment may depend on the procedure, payer policy, and how much of the service was performed.

Documentation Requirements

Procedure Started: Document that the procedure was actually initiated.

Reason for Discontinuation: Clearly state the clinical or extenuating circumstance that required the procedure to be stopped.

Patient Condition: Document relevant changes in the patient's condition or safety concerns.

Services Performed: Describe what portions of the planned procedure were completed before discontinuation.

Medical Necessity: The record should support the medical necessity of the original procedure.

Procedure Outcome: Document the patient's condition after the procedure was stopped and any subsequent treatment or follow-up plan.

Billing and Claim Considerations

Modifier 53 tells the payer that a procedure was started but could not be completed. It should not be used simply because the provider performed less work than originally anticipated.

Medicare has specific payment methodology for certain discontinued procedures. For example, CMS recognizes separate payment treatment for Modifier 53 with applicable colonoscopy services. Other procedures reported with Modifier 53 may be subject to medical review and individual consideration.

The medical record should clearly explain what occurred because the payer may need to determine whether the modifier and resulting payment adjustment are appropriate.

Providers should also distinguish professional billing with Modifier 53 from facility reporting with Modifiers 73 and 74.

Common Billing Mistakes

Procedure Was Never Started: Reporting Modifier 53 for a canceled procedure rather than one that was actually initiated.

Using Modifier 52 Instead: Confusing an unexpectedly discontinued procedure with an intentionally reduced service.

Using Modifier 53 for Facility Billing: Hospital outpatient departments and ASCs may need Modifier 73 or 74 instead.

Insufficient Documentation: Failing to explain why the procedure had to be discontinued.

Missing Procedure Details: Not documenting how much of the procedure was completed before it was stopped.

Assuming Automatic Payment: Payment treatment can depend on the procedure and payer requirements.

Common Denial Reasons

Documentation Does Not Support Discontinuation: The medical record does not clearly establish why the procedure was stopped.

Procedure Was Not Started: Documentation indicates that the service was canceled before it began.

Incorrect Modifier: Modifier 52, 73, 74, or another modifier better represents the circumstances.

Missing Clinical Reason: The record does not demonstrate an extenuating circumstance or patient safety concern.

Incorrect Billing Setting: Modifier 53 was reported when facility-specific discontinued-procedure rules applied.

Medical Necessity Not Supported: The underlying procedure itself does not meet applicable coverage requirements.

Modifier 53 vs. Modifier 52

Modifier 53: The procedure was started but unexpectedly discontinued because of extenuating circumstances or concerns for the patient's well-being.

Modifier 52: The service was partially reduced or eliminated under circumstances that do not represent the unexpected discontinuation described by Modifier 53.

The distinction depends on why the full procedure was not performed, not simply on the amount of work completed.

Modifier 53 vs. Modifiers 73 and 74

Modifier 53: Used by physicians and other applicable practitioners to report a procedure that was started but discontinued.

Modifier 73: Used in applicable outpatient hospital or ASC billing when a procedure is discontinued before anesthesia administration.

Modifier 74: Used in applicable outpatient hospital or ASC billing when a procedure is discontinued after anesthesia administration or after the procedure has begun.

CMS specifically directs outpatient hospital and ASC reporting toward Modifiers 73 and 74 rather than Modifier 53 for these circumstances.

Frequently Asked Questions

Can Modifier 53 be used when a procedure is canceled before it starts?
No. Modifier 53 generally requires that the surgical or diagnostic procedure was actually started and subsequently discontinued.

Can the procedure be performed again after Modifier 53 is reported?
Yes. A discontinued procedure may be attempted again when clinically appropriate. For covered colonoscopies, CMS specifically allows payment for a later completed attempt when applicable coverage requirements are met.