CPT® Code 10021

The procedure described by CPT® Code 10021 refers to a fine needle aspiration biopsy (FNA) performed without the use of imaging guidance, specifically for the first lesion. This minimally invasive technique utilizes a fine gauge needle, typically ranging from 22 to 25-gauge, along with a syringe to extract fluid or cellular material from a lump, lesion, or cyst. The primary objective of an FNA biopsy is to obtain a sample of tissue for diagnostic purposes, which can help in identifying the nature of the lesion, whether benign or malignant. During the procedure, the physician first cleanses the biopsy site to minimize the risk of infection. The physician then locates the target lesion through palpation, ensuring accurate needle placement. Once the needle is inserted into the mass, a vacuum is created, and the physician performs multiple in-and-out motions with the needle to collect an adequate sample. It is common for several insertions to be necessary to ensure sufficient tissue is obtained for analysis. After the sample is collected, it is prepared by smearing it onto a microscope slide, which is then air-dried and fixed using either a spray or immersion in a liquid solution. The fixed samples are subsequently stained and examined under a microscope by a pathologist for diagnostic evaluation. Notably, FNA biopsies do not require stitches and are typically conducted on an outpatient basis, allowing many patients to return to their normal activities on the same day. For billing purposes, CPT® Code 10021 should be reported for the first lesion biopsied using this technique without imaging guidance, while CPT® Code 10004 is designated for each additional lesion biopsied in a similar manner.