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Modifier 66 fact sheet

Surgeons append modifier 66 to claims indicating they were on a team of surgeons performing a specific procedure on the same...

  • July 16, 2025

Modifier 73 fact sheet

Use modifier 73 to report discontinued outpatient or hospital ambulatory surgical center (ASC) procedure prior to the...

  • October 30, 2024

Modifier 77

View this article for instructions on how and when to use modifier 77.

  • March 13, 2026

Modifier 78 flowchart

Use this decision flowchart to assist in correctly applying the 78 modifier.

  • September 15, 2025

Modifier 79 flowchart

Use this decision flowchart to assist in correctly applying the 79 modifier.

  • September 15, 2025

Modifier AI

The principal physician of record appends modifier “-AI” to their initial hospital care or nursing facility visit code. All...

  • October 31, 2024

Modifiers

View details regarding specific modifiers including tips, decision flowcharts, and educational information.

  • March 2, 2026

Modifiers applicable to ambulatory surgical centers (ASCs)

Payment for ambulatory surgical centers (ASCs) are made under a separate payment system. As such, certain modifiers are specific...

  • December 9, 2024

MSP and conditional payment request claim filing guidelines

Please review this article for details on how to properly bill Medicare secondary payer (MSP) and conditional payment request...

  • October 15, 2024

MSP billing

Read this article for more information on billing your claims when Medicare is the secondary payer.

  • March 10, 2026
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