Lab tests CPT 84100 Inpatient — admitted to hospital

Phosphorus test cost in Rockford, IL — inpatient

In Rockford, IL, 1 hospital lists a cash price for phosphorus (phosphate) blood test as an inpatient: from $63.32 to $63.32, with a median of $63.32. Across Illinois, the median is $62.26 at 110 hospitals.

Cash prices at 1 facility for code 84100, as an inpatient (admitted to hospital) . Collected Sep 29, 2026; the hospital files themselves were last updated between Mar 1, 2026 and Mar 1, 2026.

Lowest$63.32Rockford Memorial Hospital

Median$63.32half of hospitals charge less

Highest$63.32in this market

Difference1.0×highest vs lowest

Hospitals, cheapest first

Hospital	Cash price	List price	Insurers pay	Off list
Rockford Memorial Hospital Rockford, IL · (815) 968-6861 CHG ASSAY OF PHOSPHORUS INORGANIC File of Mar 1, 2026 · source file	$63.32	$84.43	—	25%

Hospital The hospital that published the price, its city and the line exactly as written in its price file.

Cash price The hospital's own price for a patient paying without insurance (“discounted cash” in its price file). Hospitals must publish it under federal law, 45 CFR 180.50. Call to confirm it before booking. More

List price The hospital's full chargemaster price (“gross charge”) before any discount. Almost nobody pays it; the gap to the cash price shows what the self-pay discount is worth. More

Insurers pay The lowest and highest rates this hospital has agreed with insurance plans for the same item, from its price file. If the cash price is below what your plan pays and you have not met your deductible, paying cash can cost you less. More

Off list How much lower the cash price is than the list price.

Inpatient: lowest $63.32, median $63.32, highest $63.32.

As an outpatient, the same code is billed by 1 facility here, median $63.32 — that is the price to compare if you are not being admitted.

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.