Modifier 99- Multiple Modifiers

Modifier 99 is used when more than four modifiers are required to accurately describe a single procedure or service.

What is Modifier 99?

Modifier 99 identifies claims that require multiple modifiers to completely describe a procedure or service. It is reported when a payer or claim format allows only a limited number of modifier fields, indicating that additional applicable modifiers are associated with the service. Providers should always follow payer-specific billing requirements when reporting Modifier 99.

When to Use Modifier 99

• More than four modifiers apply to a single procedure.

• The claim format limits the number of modifier fields.

• Additional modifiers are required to accurately report the service.

• Payer guidelines permit the use of Modifier 99.

Billing Example

A complex surgical procedure requires several modifiers to fully describe the circumstances of the service. Because the claim format cannot accommodate all required modifiers, Modifier 99 is reported according to payer billing requirements.

Documentation Tips

• Document every modifier that applies to the service.

• Maintain records supporting each reported modifier.

• Follow payer instructions for reporting multiple modifiers.

• Verify claim submission requirements before billing.

Common Denial Reasons

• Modifier 99 is reported when unnecessary.

• Supporting modifiers are not documented.

• Payer-specific reporting requirements are not followed.

• Incorrect modifier sequencing on the claim.

Related Modifiers

Modifier 22

Modifier 52

Modifier 59

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