Medical Billing Modifiers Guide 2025

Medical billing modifiers are two-character codes appended to CPT or HCPCS codes to provide additional information without changing the procedure definition.

GAABN issued — service may not be covered

GWService unrelated to hospice terminal condition

GVAttending physician not employed by hospice

25 / 57Same-day E/M modifier guidance

Always verify modifier requirements with current CPT, CMS, and payer guidance.

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