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CMS Price Transparency Data Hospital file updated: 2026-03-23

CT scan, lower back (lumbar spine)

Facility: John Muir Medical Center - Walnut Creek Campus

Billing Code: 72131 (CPT)

Pillar 1 · The BaseRate™ CompositeHow 1.00× Fair BaseRate Works: Raw price averages unfairly penalize hospitals in high-wage cities or trauma centers treating sicker patients. We adjust for local CMS hospital wage levels and patient complexity first. A 1.00× score means right at the fair price average, 0.85× means 15% cheaper than fair market, and 1.30× means 30% above fair market.Good Deal · Below Fair Market
$180Fair BaseRate (0.82× Market)
Position vs. 1.00× Fair Price18% Below Fair Price 1.00× (center of the bar) is the U.S. fair price average after accounting for local hospital wages and patient complexity. Left of center (<1.00×) is below fair price; right of center (>1.00×) is above fair price.

This hospital's typical commercial price is $148 compared to the $180 fair price benchmark.

Pillar 2 · VeriRate™ Data TrustHow VeriRate™ (0–100) Works: Hospitals are legally required to publish machine-readable price files, but some bury fake $0.01 numbers or omit cash discounts. VeriRate audits each file across 5 checks (hover any badge below to see what it tests).86/100 · Verified
86/100Hover Any Check Below to See How Prices Were Audited
File Completeness90Provenance (File Completeness): Checks whether the hospital published a complete, up-to-date machine-readable price file with valid CPT and MS-DRG billing codes instead of leaving blanks.
Price Logic88Coherence (Price Logic): Checks whether the hospital’s numbers make basic sense — e.g., self-pay cash price is lower than gross list price, with no fake $0.01 or $999,999 placeholder numbers.
Peer Alignment86Concordance (Peer Alignment): Checks whether reported prices sit in a realistic range compared to Medicare and nearby hospitals rather than wild 100× unit errors.
Clean Billing83Regularity (Clean Billing): Checks whether rates are structured consistently across procedures without erratic statistical spikes or hidden unbundled facility fees.
Real Cash Discount84Cash Honesty (Real Cash Discount): Checks whether the hospital offers a genuine self-pay cash discount that beats or matches commercial insurance rates instead of billing full sticker price.
Pillar 3 · Clinical Quality & ER SpeedChecks whether higher hospital prices actually buy better clinical quality — combining CMS Star Ratings, hospital safety scores, and emergency room wait times.Regional Quality Benchmark
CMS Star Rating2/5 StarsOfficial CMS Overall Hospital Quality Star Rating (1 to 5 stars) summarizing mortality, safety of care, readmissions, and patient experience.
Safety Score42/100Composite patient safety score (0–100) derived from CMS hospital-acquired infection rates (CLABSI, CAUTI, MRSA, C. diff), surgical complications, and HCAHPS surveys.
Typical ER WaitNo ER DataMedian minutes patients spent in the emergency department before leaving from the visit, as reported to CMS Timely and Effective Care.

2-Star CMS clinical quality rating paired with 0.82× fair market pricing.

The BaseRate · fair price high confidence
A fair price for this
$180
about 1.7× the $107 Medicare rate · typically $146–$357
modeled estimate · not a bill or quote
What this hospital charges insurers
$148
Below the fair price — a good deal
about $32 under the fair price · 1.4× Medicare
Medicare pays $107 Fair price $180 This hospital $148 Cash price $2,252 Hospital's list price $5,004

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 $32 Priciest $148

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

Note: 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 CT scan, lower back (lumbar spine) is about $180 (about 1.7× the $107 Medicare rate). John Muir Medical Center - Walnut Creek Campus charges insurers about $148, or about $2,252 in cash — below the fair price — a good deal. Located in Walnut Creek, CA.

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

UnitedHealthcareBlue 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 $91 - $1,176 85%
Blue Cross Blue Shieldmajor $148 - $3,253 139%
Aetnamajor $121 - $175 113%
Cignamajor $1,295 1212%
Humanamajor $148 - $4,154 139%
Kaiser Permanentemajor $4,053 3795%
Health Net $145 - $1,221 136%
+ 27 smaller / regional plans $91 - $5,004
Government programs also on file: Medicare, Military & VA.
Excludes 11 rental-network / third-party entries (e.g. Multiplan, PHCS) — these are pricing networks, not insurers.

Self-Pay How to get the cash price

Insurance Before you use insurance

Estimate your out-of-pocket cost

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Facility Profile & Credentials

  • Address: 1601 Ygnacio Valley Rd, Walnut Creek, CA 94598
  • CMS Rating: 2 / 5 Stars
  • Ownership Type: Voluntary non-profit - Other
  • Hospital Type: Acute Care Hospitals

Other Procedures at John Muir Medical Center - Walnut Creek Campus

Compare: CT scan, lower back (lumbar spine) at other CA hospitals

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

Inline Bill X-Ray & 501(r) Calculator 501(c)(3) Nonprofit · Free Care ≤200% FPL · AGB Cap 36.3%

Audit a Bill or Quote at John Muir Medical Center - Walnut Creek Campus (Zero PHI Required)

CMS CCN: 050180
CPT 72131
Fair BaseRate™ $180
Medicare Rate $107
Self-Pay Cash $2,252
Insurer Median $148
Pre-filled with John Muir Medical Center - Walnut Creek Campus’s charged/list benchmark
Screened against 2026 HHS Federal Poverty Guidelines
2026 FPL: $15,650 + $5,500 per additional person
Step 1 · 501(r) Charity Care Check 501(r) AGB Cap: $1,816 (274% FPL)

Statutory 501(r) AGB Cap Limits Bill to $1,816

At 274% FPL (201%–400% FPL tier), 26 U.S.C. § 501(r)(5) caps FAP-eligible bills at Amounts Generally Billed (36.3% of gross = $1,816).

Step 2 · Cash vs. Insurance Arbitrage Save $2,752 Paying Cash

Self-Pay Cash Rate ($2,252) Beats Your Bill

John Muir Medical Center - Walnut Creek Campus's published 45 CFR § 180 self-pay cash rate is $2,252 (vs. $148 commercial insurer median). Ask billing to reclassify the visit to prompt-pay self-pay if it beats your deductible.

Step 3 · Fair BaseRate Target +$4,824 Above Fair BaseRate

Negotiate Toward $180 Fair BaseRate ($107 Medicare)

Your bill ($5,004) is $4,824 above the denoised Fair BaseRate ($180) and 46.8× the $107 Medicare rate.

1-Click Factual Dispute Summary: Copy a citation-backed benchmark memo (with CMS CCN, CPT code, Medicare reference, Fair BaseRate, and 26 U.S.C. § 501(r) calculations) to paste into patient-portal messages or billing appeals.
CMS Care Compare Public Quality Record

Clinical Quality, Patient Experience & Infection Benchmarks

CMS Overall2/5 Stars (2/5)

Source: CMS Hospital Care Compare. Clinical quality metrics summarize historical facility-wide cohorts and are not medical advice for individual care decisions.

Care-Setting Arbitrage, Bilateral SVD Insurer Leverage & Regional Alternatives

How to Pay Less Nearby: Freestanding Centers, Insurer Leverage & Outpatient Savings

45 CFR § 180 Primary-Source Lineage & Federal Verification Verified CMS CCN 050180

Verify the Raw Data: Official Hospital MRF, CMS Medicare.gov & Federal Filings

MRF Portal Indexed (94-1461843-1740215219_John-Muir-Health-Walnut-Creek-Medical-Center_standardcharges.zip!94-1461843-1740215219_John-Muir-Health-Walnut-Creek-Medical-Center_standardcharges.csv) Verify on CMS Medicare.gov (CCN 050180) ↗ CMS HCRIS Cost Reports ↗
Published MRF File94-1461843-1740215219_John-Muir-Health-Walnut-Creek-Medical-Center_standardcharges.zip!94-1461843-1740215219_John-Muir-Health-Walnut-Creek-Medical-Center_standardcharges.csv
Publication / Vintage2026-03-23 · 43.44 MB
Validated Rate Rows2,307,529 (CMS v3.0.0)
File Integrity Digestfc8ddbabaff35f4d9a9d…

Safe-Harbor Data Corrections: Parsed directly from public 45 CFR § 180 hospital filings, CMS Care Compare, and CMS HCRIS cost reports. Hospital compliance officers may submit updated MRF URLs or rate tables for verification.

Submit MRF Update Correction Policy