Lab tests CPT 84436 Inpatient — admitted to hospital

Total T4 test cost in Janesville, WI — inpatient

In Janesville-Beloit, WI, 2 hospitals list a cash price for total thyroxine (T4) blood test as an inpatient: from $93.44 to $109.73, with a median of $101.59. The lowest listed price is at Edgerton Hospital and Health Services — $8.15 less than the median here. Across Wisconsin, the median is $52.00 at 93 hospitals.

Cash prices at 2 facilities across 2 cities for code 84436, as an inpatient (admitted to hospital) . Collected Sep 29, 2026; the hospital files themselves were last updated between Mar 1, 2026 and Jul 19, 2026.

Lowest$93.44Edgerton Hospital and Health Services

Median$101.59half of hospitals charge less

Highest$109.73in this market

Difference1.2×highest vs lowest

Where each hospital's price falls

Each dot is one hospital's cash price on a scale from the lowest to the highest in Janesville-Beloit, WI.

median

Lowest $93.44Highest $109.73

Hospitals, cheapest first

Hospital	Cash price	List price	Insurers pay	Off list
Edgerton Hospital and Health Services lowest Edgerton, WI · (608) 884-3441 LCHG T4 TOTAL File of Jul 19, 2026 · source file	$93.44	$128.00	$12.17–$74.00	27%
Mercyhealth Hospital & Trauma Center Janesville, WI · (608) 756-6161 CHG ASSAY OF THYROXINE TOTAL File of Mar 1, 2026 · source file	$109.73	$146.31	—	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 $93.44, median $101.59, highest $109.73 — a 1.2× difference within the same market.

As an outpatient, the same code is billed by 2 facilities here, median $101.59 — that is the price to compare if you are not being admitted.

Cash or insurance?

At the one hospital here that publishes insurer rates for this code, the cash price is not below the highest rate a health plan has negotiated. 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 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.