Modifier 53: Discontinued Procedure

Definition

Modifier 53 is used when a procedure is started but discontinued before completion due to patient safety concern, patient request, anesthesia complication, or inability to complete safely. The procedure was not intentionally reduced; rather, it was abandoned intraoperatively. Modifier 53 requires documentation of why the procedure could not be safely completed and what portion was actually performed.

When to Use

Arthroscopy begun; patient becomes hypertensive/unstable; procedure abandoned after 10 minutes; 50% service delivered
EGD initiated; severe bleeding encountered; procedure discontinued before planned intervention; biopsy not taken
Intubation attempted; unsuccessful after multiple attempts; procedure abandoned; patient maintained on supplemental oxygen
Surgical approach made; unexpected anatomical finding prevents safe completion; procedure discontinued; minimal tissue trauma

Documentation Requirements

Document specific reason procedure was discontinued. Note what happened intraoperatively that necessitated stopping. Quantify estimated completion: e.g., 'Approximately 25% of planned procedure completed.' Document patient safety concern or clinical reason explicitly. Include findings up to point of discontinuation. Anesthesia record should support early termination. Do NOT use 53 for incomplete documentation or simply running out of time.

Payer-Specific Rules

Payer	Acceptance	Common Denials	Notes
Medicare	Accepted; payment proportional to completion	CO-53: Procedure discontinued	Reimburse based on portion completed. Typically 25-75% of full code value.
Aetna	Accepted; reduction significant	CO-151: Documentation missing	Will pay. Reduce substantially (usually 50% or more reduction).
United Healthcare	Accepted with documentation	CO-4: Service bundled	Will pay reduced amount. Require clear intraoperative reason for discontinuation.
Cigna	Accepted; case-by-case	CO-16: Service not medically necessary	Review reason. May approve with strong documentation.
Humana	Accepted; good approval	CO-3: Service not covered	Routine approval for discontinued procedures when safety documented.

Related Modifiers

52 – Reduced services. Use for planned reductions, not abandoned procedures.
25 – Significant E/M. Use if E/M performed addressing patient safety issue same day.
76 – Repeat procedure same physician. Use if repeat attempted after discontinuation.

Common Denials

CARC Code	Reason	Primary Cause
CO-53	Procedure discontinued	Payer denies any payment for discontinued procedure.
CO-151	Documentation insufficient	Claim lacks explanation of why procedure was discontinued.
CO-16	Service not medically necessary	Payer deems discontinuation reason not valid.

FAQ

What payment should I expect for a discontinued procedure?

Typically 25-75% of full code value, depending on portion completed. Document percentage of planned work done.

Can I bill for patient-initiated discontinuation?

Yes, if documented. Patient request to stop due to discomfort or anxiety is valid reason.

If I try again the next day, do I use modifier 76?

Possibly. If repeat is same day, use modifier 76. If next day, new procedure code (no modifier if it's a fresh attempt).

Prevent These Denials

Get paid for discontinued procedures. Use a co-pilot to document intraoperative events clearly.

Related Resources

This reference is current as of 2026-03-23. Payer policies change. Always verify against the payer's latest policy documentation.

← Back to Modifier Reference Hub