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09BT Frontal Sinus, Left
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09BT0 Open
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09BT3 Percutaneous
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09BT4 Percutaneous Endoscopic
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09BT7 Via Natural or Artificial Opening
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09BT7Z No Device
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09BT8 Via Natural or Artificial Opening Endoscopic
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09BTX External
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09BTXZ No Device
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