CPT® 99, Under Provider Services and Ambulatory Service Center Modifiers
The Current Procedural Terminology (CPT®) code 99 as maintained by American Medical Association, is a medical procedural code under the range - Provider Services and Ambulatory Service Center Modifiers.
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Lay Term
Summary
Append modifier 99 to a procedure or service as the first modifier when there are also two or more additional modifiers applicable to the service or procedure.
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Modifier Guidelines
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