Lab tests CPT 84100 Inpatient — admitted to hospital

Phosphorus test cost in Stockton, CA — inpatient

In Stockton-Lodi, CA, 3 hospitals list a cash price for phosphorus (phosphate) blood test as an inpatient: from $75.60 to $142.00, with a median of $140.24. The lowest listed price is at Kaiser Foundation Hospital - Manteca — $64.64 less than the median here. Across California, the median is $75.60 at 194 hospitals.

Cash prices at 3 facilities across 3 cities for code 84100, as an inpatient (admitted to hospital) . Collected Sep 29, 2026; the hospital files themselves were last updated between Feb 28, 2026 and Apr 1, 2026.

Lowest$75.60Kaiser Foundation Hospital - Manteca

Median$140.24half of hospitals charge less

Highest$142.00in this market

Difference1.9×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 Stockton-Lodi, CA.

median

Lowest $75.60Highest $142.00

Hospitals, cheapest first

Hospital	Cash price	List price	Insurers pay	Off list
Kaiser Foundation Hospital - Manteca lowest Manteca, CA · (209) 825-3700 ASSAY OF PHOSPHORUS INORGANIC source file	$75.60	$135.00	$5.00–$15.00	44%
St Joseph's Medical Center of Stockton Stockton, CA · (209) 943-2000 PHOSPHORUS File of Feb 28, 2026 · source file	$140.24	$477.00	$343.44–$391.14	71%
Sutter Tracy Community Hospital Tracy, CA · (209) 835-1500 HCHG PHOSPHORUS (PO4) File of Apr 1, 2026 · source file	$142.00	$142.00	—	—

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.

No cash discount This line's cash price equals the hospital's full list price. Many hospitals still reduce bills for uninsured patients: ask the billing office for its self-pay discount in writing. More

Inpatient: lowest $75.60, median $140.24, highest $142.00 — a 1.9× difference within the same market.

As an outpatient, the same code is billed by 4 facilities here, median $141.12 — that is the price to compare if you are not being admitted.

Cash or insurance?

At 1 of 2 hospitals that publish insurer rates for this code here, the cash price is below the highest rate a health plan has negotiated, and at 1 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.

2 rows held back from this comparison

They are priced below $1 or below a tenth of the national median for code 84100 ($41.60). Such a line is almost always a physician's fee billed separately, an assistant's share or a placeholder — a real charge, but not the price of the procedure itself.

Hospital	Cash price	File
St Joseph's Medical Center of Stockton Stockton, CARL-A-PHOS 20028	$1.91	file
St. Joseph's Behavioral Health Center Stockton, CARL-A-PHOS 20028	$3.70	file

File Link to the hospital's own price file.