CMS Price Transparency Data

Blood antibody screen

Facility: Marinhealth Medical Center

Billing Code: 86850 (CPT)

The BaseRate · fair price low confidence

A fair price for this

$117

about 2.2× the $53 Medicare rate · typically $11–$177

modeled estimate · not a bill or quote

What this hospital charges insurers

$270

Well above the fair price

about $153 over the fair price · 5.1× Medicare

Medicare pays $53 Fair price $117 This hospital $270 Cash price $199 Hospital's list price $332

How we calculate the fair BaseRate →

How this hospital compares to other CA hospitals

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

Cheapest $3 Priciest $270

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

A fair price for a Blood antibody screen is about $117 (about 2.2× the $53 Medicare rate). Marinhealth Medical Center charges insurers about $270, or about $199 in cash — well above the fair price. Located in Greenbrae, CA.

This price is above the fair BaseRate — you may be able to pay less

Ask the hospital for the cash / self-pay price, check whether you qualify for financial assistance, or negotiate the bill down toward the fair price of about $117. Many patients pay well below the first number they’re quoted — the checklists below walk you through it.

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✓ Kaiser Permanente Humana

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	$27 - $2,330	51%
Blue Cross Blue Shieldmajor	$16 - $502	30%
Aetnamajor	$35 - $74	66%
Cignamajor	$30	56%
Kaiser Permanentemajor	$74	139%
Health Net	$74 - $191	139%
+ 7 smaller / regional plans	$74 - $463

Excludes 4 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 199), 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: 86850.

Insurance Before you use insurance

Call your insurance company to confirm Marinhealth Medical Center is in-network.
Ask your insurer whether prior approval is required for CPT code 86850.
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 Marinhealth Medical Center

Compare: Blood antibody screen at other CA hospitals

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