88304

Level III - Surgical Pathology, Gross and Microscopic Examination

CPT code 88304 represents Level III surgical pathology, which involves the gross and microscopic examination of specific tissue specimens that are considered to be of low to moderate complexity. This level is distinct from others in the surgical pathology series (88300-88309) based on the inherent difficulty and time required for the pathologist to render a diagnosis. The process begins with the receipt of a specimen in a fixative, usually 10% neutral buffered formalin. The pathologist or a pathologist assistant performs a 'gross examination,' which includes a detailed physical description of the specimen's size, weight, color, and consistency, as well as identifying any abnormalities such as lesions, ulcers, or areas of discoloration. The specimen is then dissected, and representative sections are placed into plastic cassettes. These cassettes undergo tissue processing, where water is replaced by paraffin wax to provide structural support for thin sectioning. Once embedded in paraffin blocks, extremely thin slices (usually 4 to 5 micrometers) are cut using a microtome and mounted on glass slides. The slides are then stained, most commonly with Hematoxylin and Eosin (H&E), to highlight cellular structures. The pathologist then performs a 'microscopic examination,' evaluating the cellular morphology and tissue architecture to provide a definitive diagnosis. This level typically includes specimens like the gallbladder, appendix (other than incidental), hemorrhoids, skin tags, and various inflammatory polyps. The final pathology report integrates both the gross findings and the microscopic interpretation to guide clinical management.

Clinical Indications

  • Evaluation of gallbladder for cholecystitis or cholelithiasis.
  • Examination of the appendix for acute or chronic appendicitis.
  • Assessment of hemorrhoidal tissue for secondary pathology.
  • Histopathologic evaluation of skin tags or benign skin lesions.
  • Diagnosis of nasal, colorectal, or inflammatory polyps.
  • Examination of debrided skin or soft tissue from non-healing wounds.
  • Evaluation of synovial cysts or bursa specimens for inflammatory changes.
  • Confirmation of abscess drainage wall tissue or fistula tracts.
  • Assessment of carpal ligament tissue in carpal tunnel release.
  • Microscopic review of diverticula of the esophagus or colon.

Procedure Steps

  1. Accessioning: The specimen is received, labeled, and logged into the laboratory information system.
  2. Gross Examination: The pathologist or assistant performs a visual and physical inspection, documenting dimensions and characteristics.
  3. Tissue Sampling: Representative sections of the specimen are selected and placed into labeled cassettes.
  4. Fixation and Processing: The tissue is treated with chemicals to prevent decay and embedded in paraffin wax.
  5. Embedding: Tissue samples are oriented in paraffin blocks for sectioning.
  6. Microtomy: The blocks are sliced into thin sections and placed onto glass slides.
  7. Staining: Slides are stained using H&E or other routine stains to visualize cellular components.
  8. Microscopic Review: A pathologist examines the slides under a microscope to identify cellular abnormalities.
  9. Diagnosis and Documentation: The pathologist formulates a diagnosis based on combined gross and microscopic findings.
  10. Reporting: A final pathology report is generated and sent to the referring clinician.

Coding Guidelines

  • Report 88304 for each separate specimen that meets the criteria for a Level III examination as defined by the CPT manual.
  • A specimen is defined as tissue submitted in a separate container or, if in the same container, uniquely identified as being from a different site.
  • If multiple specimens of the same type (e.g., three separate skin tags in three containers) are submitted, 88304 should be reported for each container.
  • Level III should not be used if the specimen type is specifically listed under a higher or lower level (e.g., a biopsy of the breast is 88305, not 88304).
  • The code 88304 includes both the gross and microscopic examination; it cannot be split unless using modifiers for professional (26) or technical (TC) components.
  • Incidental specimens that do not require microscopic examination for a diagnosis may be better coded as 88300 (gross only) or 88302 (Level II), depending on the tissue type.
  • Do not report 88304 in conjunction with other surgical pathology levels for the same single specimen.
  • The service is complete when the pathologist's report is signed and issued.

Associated ICD-10 Codes