CMS Price Transparency Data

Blood test, magnesium

Facility: Barnes Jewish Hospital

Billing Code: 83735 (CPT)

The BaseRate · fair price high confidence

A fair price for this

$12

about 1.7× the $7 Medicare rate · typically $8–$13

modeled estimate · not a bill or quote

What this hospital charges insurers

$13

About the fair price

about $1 over the fair price · 1.9× Medicare

Medicare pays $7 Fair price $12 This hospital $13 Cash price $92 Hospital's list price $153

How we calculate the fair BaseRate →

How this hospital compares to other MO hospitals

Highest price of the 9 MO hospitals we have prices for — worth calling around.

Cheapest $6 Priciest $13

Black dot = this hospital, among the 9 MO hospitals with a price for this procedure. Full list below.

⚠ The cash price looks unusually high next to the insurance price — it may be the full list price, not a real cash discount. Call to confirm the self-pay rate.

A fair price for a Blood test, magnesium is about $12 (about 1.7× the $7 Medicare rate). Barnes Jewish Hospital charges insurers about $13, or about $92 in cash — about the fair price. Located in Saint Louis, MO.

What each insurance company pays

Which insurers have negotiated a price with this hospital for this procedure — and which haven’t.

5 of 6 major insurers have a published price at this hospital

✓ UnitedHealthcare✓ Blue Cross Blue Shield✓ Aetna✓ Cigna✓ Humana Kaiser Permanente

Crossed out = this hospital hasn’t published a negotiated price for that insurer for this procedure. It doesn’t necessarily mean they aren’t accepted — ask your insurer.

Insurance company	Price range	vs. Medicare
UnitedHealthcaremajor	$7 - $114	104%
Blue Cross Blue Shieldmajor	$21 - $133	313%
Aetnamajor	$13 - $115	194%
Cignamajor	$9 - $122	134%
Humanamajor	$22	328%
HealthLink	$74 - $116	1104%
Medica	$122	1821%
Priority Health	$16	239%
UniCare	$99 - $116	1478%
+ 18 smaller / regional plans	$8 - $115

Excludes 6 rental-network / third-party entries (e.g. Multiplan, PHCS) — these are pricing networks, not insurers.

Self-Pay How to get the cash price

Tell the billing desk you want to be billed as self-pay — not through insurance — before your visit.
Ask for the cash / prompt-pay discount in writing, with the exact price (about 92), before you agree to anything.
Get it in writing that they won’t also bill your insurance, so the cash price is what you owe.
Check the CPT code on your bill matches exactly: 83735.

Insurance Before you use insurance

Call your insurance company to confirm Barnes Jewish Hospital is in-network.
Ask your insurer whether prior approval is required for CPT code 83735.
Confirm the doctor or provider is in-network too — not just the hospital building.
Check your Explanation of Benefits against the hospital’s final itemized bill.

Estimate your out-of-pocket cost

A rough estimate of what you’d pay with insurance (deductible + coinsurance) versus paying the cash price yourself.

How you’d pay

Deductible left to meet ($)

Your coinsurance (%)

Enter your details and press estimate to compare.

Other Procedures at Barnes Jewish Hospital

Compare: Blood test, magnesium at other MO hospitals

Insurance negotiated median for the same procedure, sorted lowest first.