Phosphorus test cost in Austin, TX — inpatient
In Austin-Round Rock-San Marcos, TX, 20 hospitals list a cash price for phosphorus (phosphate) blood test as an inpatient: from $20.61 to $98.75, with a median of $50.56. The lowest listed price is at Ascension Seton Hays — $29.95 less than the median here. Across Texas, the median is $62.87 at 300 hospitals.
Cash prices at 20 facilities across 10 cities for code 84100, as an inpatient (admitted to hospital) . Collected Sep 29, 2026; the hospital files themselves were last updated between Mar 5, 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 Austin-Round Rock-San Marcos, TX.
Hospitals, cheapest first
| Hospital | Cash price | List price | Insurers pay | Off list |
|---|---|---|---|---|
| Ascension Seton Hays lowest Kyle, TX · (512) 324-5000 PHOSPHORUS+1 more line at this price source file | $20.61 | $57.25 | $3.98–$35.21 | 64% |
| Ascension Seton Smithville Smithville, TX · (512) 237-3214 PHOSPHORUS (PHOSPHATE) BLOOD+1 more line at this price source file | $21.42 | $59.50 | $3.98–$35.21 | 64% |
| Ascension Seton Northwest Austin, TX · (512) 324-6000 PHOSPHORUS+1 more line at this price source file | $21.42 | $59.50 | $3.98–$35.21 | 64% |
| Dell Seton Medical Center at the University of Tx Austin, TX · (512) 324-7000 PHOSPHORUS+1 more line at this price source file | $21.42 | $59.50 | $3.98–$35.21 | 64% |
| Ascension Seton Hays Kyle, TX · (512) 324-5000 PHOSPHORUS FLUID source file | $21.42 | $59.50 | $3.98–$35.21 | 64% |
| Ascension Seton Southwest Austin, TX · (512) 324-9000 PHOSPHORUS+1 more line at this price source file | $21.42 | $59.50 | $3.98–$35.21 | 64% |
| Ascension Seton Medical Center Austin Austin, TX · (512) 324-1000 PHOSPHORUS+1 more line at this price source file | $21.42 | $59.50 | $3.98–$35.21 | 64% |
| Ascension Seton Edgar B Davis Luling, TX · (830) 875-7000 PHOSPHORUS+1 more line at this price source file | $27.09 | $75.25 | $3.98–$35.21 | 64% |
| Ascension Seton Smithville Smithville, TX · (512) 237-3214 PHOSPHORUS FLUID source file | $40.14 | $111.50 | $3.98–$50.17 | 64% |
| Ascension Seton Austin, TX PHOSPHORUS (PHOSPHATE) BLOOD+1 more line at this price source file | $41.65 | $59.50 | $3.98–$35.21 | 30% |
| Baylor Scott & White Medical Center - Buda Buda, TX · (737) 999-6200 HC PHOSPHORUS INORGANIC (PHOSPHATE) File of Jun 13, 2026 · source file | $50.56 | $84.27 | $46.35–$58.99 | 40% |
| Baylor Scott & White Medical Center - Lakeway Lakeway, TX · (512) 509-0401 HC PHOSPHORUS INORGANIC (PHOSPHATE) File of Jun 13, 2026 · source file | $50.56 | $84.27 | $46.35–$75.84 | 40% |
| Baylor Scott & White Medical Center - Pflugerville Pflugerville, TX · (512) 654-6100 HC PHOSPHORUS INORGANIC (PHOSPHATE) File of Jun 13, 2026 · source file | $50.56 | $84.27 | $46.35–$75.84 | 40% |
| Baylor Scott & White Medical Center - Round Rock Round Rock, TX · (512) 509-0401 HC PHOSPHORUS INORGANIC (PHOSPHATE) File of Jun 13, 2026 · source file | $50.56 | $84.27 | $46.35–$75.84 | 40% |
| Baylor Scott & White Medical Center - Taylor Taylor, TX · (512) 352-7611 HC PHOSPHORUS INORGANIC (PHOSPHATE) File of Jun 12, 2026 · source file | $50.56 | $84.27 | $46.35–$67.42 | 40% |
| Baylor Scott & White Emergency Medical Center - Cedar Park Cedar Park, TX · (512) 509-0401 HC PHOSPHORUS INORGANIC (PHOSPHATE) File of Jun 3, 2026 · source file | $50.56 | $84.27 | $46.35–$54.78 | 40% |
| Baylor Scott & White Medical Center - Austin Austin, TX · (512) 654-2100 HC PHOSPHORUS INORGANIC (PHOSPHATE) File of Jun 13, 2026 · source file | $50.56 | $84.27 | $46.35–$58.99 | 40% |
| Texas Children's Hospital - Austin Austin, TX · (832) 824-1100 TC PHOSPHORUS, INORGANIC File of Mar 5, 2026 · source file | $62.31 | $93.00 | $37.20–$88.35 | 33% |
| Ascension Seton Austin, TX PHOSPHORUS FLUID source file | $78.05 | $111.50 | $3.98–$50.17 | 30% |
| PAM Rehabilitation Hospital of Round Rock Round Rock, TX Phosphorus File of Aug 6, 2026 · source file | $78.45 | $78.45 | $54.92–$70.61 | — |
| Warm Springs Rehabilitation Hospital of Kyle Kyle, TX Phosphorus File of Aug 6, 2026 · source file | $78.45 | $78.45 | $54.92–$70.61 | — |
| Ascension Cedar Park Cedar Park, TX · (512) 528-7000 PHOSPHORUS, BLOOD source file | $90.41 | $251.13 | $3.98–$113.01 | 64% |
| Pam Specialty Hospital of Luling Luling, TX Phosphorus File of Aug 6, 2026 · source file | $98.75 | $98.75 | $69.13–$88.88 | — |
Inpatient: lowest $20.61, median $50.56, highest $98.75 — a 4.8× difference within the same market.
As an outpatient, the same code is billed by 30 facilities here, median $50.56 — that is the price to compare if you are not being admitted.
Cash or insurance?
At 16 of 20 hospitals that publish insurer rates for this code here, the cash price is below the highest rate a health plan has negotiated, and at none is it 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.