Lab tests CPT 84436 Outpatient

Total T4 test cost in Rockford, IL

In Rockford, IL, 1 hospital lists a cash price for total thyroxine (T4) blood test: from $108.05 to $108.05, with a median of $108.05. Across Illinois, the median is $81.90 at 112 hospitals.

Cash prices at 1 facility for code 84436, as an outpatient — the setting a self-pay patient normally buys. Collected Sep 29, 2026; the hospital files themselves were last updated between Mar 1, 2026 and Mar 1, 2026.

Lowest$108.05Rockford Memorial Hospital

Median$108.05half of hospitals charge less

Highest$108.05in 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 THYROXINE TOTAL File of Mar 1, 2026 · source file	$108.05	$144.07	—	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.

Outpatient: lowest $108.05, median $108.05, highest $108.05.

As an inpatient, the same code is billed by 1 facility here, median $108.05. Inpatient and outpatient prices are not comparable and are kept on separate pages: the inpatient charge covers admission, not the same purchase.

What it is

A total T4 test measures all the thyroxine hormone in the blood, both bound and free. Most doctors now order free T4 (84439) instead, which is less affected by pregnancy and medicines.

What the price covers

The price usually covers running the test. The blood draw (36415) is often billed as a separate line.