{
    "code": "84100",
    "coding_system": "CPT",
    "canonical_url": "https://localishealth.com/cpt/84100/2014/B",
    "release_specific_url": "https://localishealth.com/cpt/84100/2016/C",
    "description": "Measures inorganic phosphate in the blood. Phosphate is cleared by the kidneys and regulated in tandem with calcium, vitamin D, and parathyroid hormone, so it climbs as kidney function fails and falls with malnutrition, with overactive parathyroid glands, and in the first days of feeding someone who has been starved. It is a routine part of monitoring people with chronic kidney disease and those on dialysis, where a persistently high level drives bone and blood-vessel damage.",
    "answer": {
        "question": "Did Medicare pay separately for CPT 84100 in Q3 2016?",
        "text": "Not at a published national rate. CPT 84100 carries status X (statutory exclusion) in the Q3 2016 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": 2016,
        "quarter": "C",
        "label": "Q3 2016",
        "effective": "July 1 – September 30, 2016",
        "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": 35.8043,
    "source": {
        "label": "Physician relative value file (Q3 2016)",
        "cms_url": "https://www.cms.gov/medicare/medicare-fee-for-service-payment/physicianfeesched/downloads/rvu16c.zip",
        "local_source_url": "https://localishealth.com/sources/physician-fee-schedule/2016/C",
        "file": "PPRRVU16_V0517.csv",
        "row": 13707,
        "sha256": "81464316ee60bdd4aa33b47a636b521a77a73481c795300cbab67f48dbe432d9"
    },
    "modified_at": "2026-08-04T03:06:56+00:00"
}