CMS Price Transparency Data

Blood test, magnesium

Facility: Adventist Health Castle

Billing Code: 83735 (CPT)

The BaseRate · fair price high confidence

A fair price for this

$10

about 1.4× the $7 Medicare rate · typically $8–$11

modeled estimate · not a bill or quote

What this hospital charges insurers

About the fair price

about $1 under the fair price · 1.3× Medicare

Medicare pays $7 Fair price $10 This hospital $9 Cash price $20 Hospital's list price $61

How we calculate the fair BaseRate →

How this hospital compares to other HI hospitals

A typical price — 0 charge more and 4 charge less, among the 9 HI hospitals compared.

Cheapest $7 Priciest $9

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

A fair price for a Blood test, magnesium is about $10 (about 1.4× the $7 Medicare rate). Adventist Health Castle charges insurers about $9, or about $20 in cash — about the fair price. Located in Kailua, HI.

What each insurance company pays

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

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

✓ UnitedHealthcare Blue Cross Blue ShieldAetnaCignaHumanaKaiser 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	$9	134%
Devoted Health	$7	104%
+ 9 smaller / regional plans	$1 - $238

Government programs also on file: Medicare, Medicaid.

Excludes 5 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 20), 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 Adventist Health Castle 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 Adventist Health Castle

Compare: Blood test, magnesium at other HI hospitals

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