CPT® 90, Under Provider Services and Ambulatory Service Center Modifiers
The Current Procedural Terminology (CPT®) code 90 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 90 to a laboratory or pathology test when a reference, or outside, laboratory performs the test instead of the treating or reporting provider.
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Modifier Guidelines
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