CMS Price Transparency Data

Diagnostic mammogram (both breasts)

Facility: John Muir Medical Center - Walnut Creek Campus

Billing Code: 77066 (CPT)

The BaseRate · fair price high confidence

A fair price for this

$192

about 1.2× the $157 Medicare rate · typically $143–$336

modeled estimate · not a bill or quote

What this hospital charges insurers

$239

Above the fair price

about $47 over the fair price · 1.5× Medicare

Medicare pays $157 Fair price $192 This hospital $239 Cash price $371 Hospital's list price $824

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 $48 Priciest $239

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

A fair price for a Diagnostic mammogram (both breasts) is about $192 (about 1.2× the $157 Medicare rate). John Muir Medical Center - Walnut Creek Campus charges insurers about $239, or about $371 in cash — above the fair price. Located in Walnut Creek, 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 $192. 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.

6 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	$103 - $194	66%
Blue Cross Blue Shieldmajor	$194 - $1,307	124%
Aetnamajor	$473 - $482	301%
Cignamajor	$213	136%
Humanamajor	$155 - $684	99%
Kaiser Permanentemajor	$667	425%
Health Net	$152 - $201	97%
+ 19 smaller / regional plans	$103 - $4,000

Government programs also on file: Medicare, Military & VA.

Excludes 10 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 371), 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: 77066.

Insurance Before you use insurance

Call your insurance company to confirm John Muir Medical Center - Walnut Creek Campus is in-network.
Ask your insurer whether prior approval is required for CPT code 77066.
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 John Muir Medical Center - Walnut Creek Campus

Compare: Diagnostic mammogram (both breasts) at other CA hospitals

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