{
    "code": "84450",
    "coding_system": "CPT",
    "canonical_url": "https://localishealth.com/cpt/84450/2014/B",
    "release_specific_url": "https://localishealth.com/cpt/84450/2020/D",
    "description": "Measures aspartate aminotransferase, an enzyme that sits inside liver cells but is also plentiful in heart and skeletal muscle. When those cells are damaged the enzyme spills into the bloodstream, so a raised level flags tissue injury without pinning down the location. It is almost always interpreted next to ALT, its more liver-specific counterpart, and the ratio between the two carries its own meaning.",
    "answer": {
        "question": "Did Medicare pay separately for CPT 84450 in Q4 2020?",
        "text": "Not at a published national rate. CPT 84450 carries status X (statutory exclusion) in the Q4 2020 release. The statutory definition of physician services does not include this item. Treat the blank amount as unpriced, not as $0."
    },
    "release": {
        "schedule": "pfs",
        "year": 2020,
        "quarter": "D",
        "label": "Q4 2020",
        "effective": "October 1 – December 31, 2020",
        "revision": 1
    },
    "status": {
        "code": "X",
        "non_facility_payable": false,
        "facility_payable": false
    },
    "national_rates_usd": {
        "office_non_facility": null,
        "facility": null,
        "sequestration_applied": false,
        "gpci": 1
    },
    "rvus": {
        "work": null,
        "practice_expense_non_facility": null,
        "practice_expense_facility": null,
        "malpractice": null
    },
    "formula": "(work_rvu × work_gpci + pe_rvu × pe_gpci + mp_rvu × mp_gpci) × conversion_factor",
    "conversion_factor": 36.0896,
    "source": {
        "label": "Physician relative value file (Q4 2020)",
        "cms_url": "https://www.cms.gov/files/zip/rvu20d-updated-11232020.zip",
        "local_source_url": "https://localishealth.com/sources/physician-fee-schedule/2020/D",
        "file": "PPRRVU20_OCT.csv",
        "row": 14740,
        "sha256": "504fd19a9bc1d2eeebb290adac2d7de6c56d4e86cde7532df1862fe42494d319"
    },
    "modified_at": "2026-08-04T03:10:00+00:00"
}