20610 | Arthrocentesis, aspiration and/or injection; major joint or bursa (e.g., shoulder, hip, knee, subacromial bursa) | Commonly performed immediately before sending synovial fluid for 0601U; documents the aspiration procedure. |
88112 | Cytopathology; body fluid, non-gyn, except cerebrospinal fluid, initial interpretation | May be used when cytologic evaluation of synovial fluid is performed in addition to biomarker testing. |
87075 | Culture, bacterial; any other source except urine, blood or stool, aerobic, with isolation and presumptive identification of isolates | Microbiologic cultures of synovial fluid are frequently ordered alongside 0601U to identify causative organisms. |
87077 | Culture, bacterial; any other source except urine, blood or stool, aerobic, with isolation, and presumptive identification, enhanced | Alternative or additional culture coding where extended microbiology methods are used in parallel with molecular/biomarker testing. |
87471 | Infectious agent detection by nucleic acid (DNA or RNA); Chlamydia trachomatis, amplified probe technique | Example molecular detection code when PCR-based organism-specific testing is performed on synovial fluid as adjunctive testing. |
83520 | Creatinine; measured in body fluids other than blood | Clinical chemistry testing of synovial fluid components may be performed in the laboratory workflow alongside the PLA panel. |
99000 | Handling and/or conveyance of specimen to lab (non-covered) | Administrative code sometimes used per facility billing practices for specimen handling; payer rules vary. |
80500 | Drug assay, qualitative; immunoassay screen (e.g., therapeutic drug monitoring — example of immunoassay methodology) | Represents immunoassay methodology commonly used in biomarker platforms and may be billed for specific in-house assays when applicable. |