Phosphorus test cost in Louisville, KY — inpatient
In Louisville/Jefferson County, KY-IN, 14 hospitals list a cash price for phosphorus (phosphate) blood test as an inpatient: from $9.84 to $95.16, with a median of $35.80. The lowest listed price is at University of Louisville Hospital — $25.96 less than the median here. Across Kentucky, the median is $52.25 at 78 hospitals.
Cash prices at 14 facilities across 7 cities for code 84100, as an inpatient (admitted to hospital) . Collected Sep 29, 2026; the hospital files themselves were last updated between Feb 11, 2026 and Aug 6, 2026.
Where each hospital's price falls
Each dot is one hospital's cash price on a scale from the lowest to the highest in Louisville/Jefferson County, KY-IN.
Hospitals, cheapest first
| Hospital | Cash price | List price | Insurers pay | Off list |
|---|---|---|---|---|
| University of Louisville Hospital lowest Louisville, KY · (502) 562-3000 ASSAY OF PHOSPHORUS source file | $9.84 | $41.00 | $11.32–$41.00 | 76% |
| Norton Clark Hospital Jeffersonville, IN · (812) 283-2147 HB PHOSPHORUS BLOOD File of Jun 3, 2026 · source file | $14.14 | $101.00 | $43.45–$88.38 | 86% |
| Saints Mary & Elizabeth Hospital Louisville, KY ASSAY OF PHOSPHORUS source file | $22.32 | $62.00 | $18.60–$62.00 | 64% |
| Norton Children's Hospital Louisville, KY HB PHOSPHORUS BLOOD File of Feb 11, 2026 · source file | $35.80 | $179.00 | $29.54–$152.15 | 80% |
| Norton Women's and Kosair Children's Hospital Louisville, KY HB PHOSPHORUS BLOOD File of Feb 13, 2026 · source file | $35.80 | $179.00 | $29.54–$165.04 | 80% |
| Norton Brownsboro Hospital Louisville, KY HB PHOSPHORUS BLOOD File of Feb 11, 2026 · source file | $35.80 | $179.00 | $29.54–$165.04 | 80% |
| Norton West Louisville Hospital Louisville, KY HB PHOSPHORUS BLOOD File of Feb 11, 2026 · source file | $35.80 | $179.00 | $29.54–$165.04 | 80% |
| Norton Hospital Louisville, KY · (502) 629-8000 HB PHOSPHORUS BLOOD File of Feb 11, 2026 · source file | $35.80 | $179.00 | $29.54–$165.04 | 80% |
| UofL Health - Jewish Hospital and Mary & Elizabeth Hospital Louisville, KY · (502) 587-4011 ASSAY OF PHOSPHORUS source file | $38.70 | $86.00 | $30.57–$86.00 | 55% |
| UofL Health-Louisville – South Hospital Shepherdville, KY ASSAY OF PHOSPHORUS source file | $43.65 | $97.00 | $29.10–$97.00 | 55% |
| UofL Health -Shelbyville Shelbyville, KY · (502) 647-4000 ASSAY OF PHOSPHORUS source file | $46.36 | $122.00 | $43.37–$122.00 | 62% |
| St. Vincent Salem Hospital Salem, IN · (812) 883-5881 PHOSPHORUS INORGANIC-PHOSPHATE source file | $60.60 | $101.00 | $2.24–$10.81 | 40% |
| CHI Saint Joseph Flaget Memorial Hospital Bardstown, KY · (502) 350-5000 HC LAB PHOSPHORUS File of Feb 28, 2026 · source file | $85.29 | $201.00 | $146.73–$182.91 | 58% |
| Cobalt Rehabilitation Hospital Louisville Clarksville, IN Phosphorus File of Aug 6, 2026 · source file | $95.16 | $95.16 | $66.61–$80.89 | — |
Inpatient: lowest $9.84, median $35.80, highest $95.16 — a 9.7× difference within the same market.
As an outpatient, the same code is billed by 18 facilities here, median $41.18 — that is the price to compare if you are not being admitted.
Cash or insurance?
At 12 of 14 hospitals that publish insurer rates for this code here, the cash price is below the highest rate a health plan has negotiated, and at 3 it is below every plan's rate. If you have insurance but have not met your deductible, you usually pay your plan's negotiated rate, which falls somewhere in the "Insurers pay" column. Paying cash can cost less, but a cash payment usually does not count toward your deductible. Ask the hospital for both numbers before you book.
What it is
A phosphorus test measures phosphate in the blood. It is used with calcium for kidney disease, bone disease and parathyroid problems.
What the price covers
The price usually covers running the test. The blood draw (36415) is often billed as a separate line.