Mayo immunoassay tumor antigen quantitative chromogranin a at Mark Twain Medical Center

768 Mountain Ranch Rd, San Andreas, CA · CommonSpirit Health · · NPI 1508968819

Source: hospital's published price file ↗ · Published Feb 28, 2026 · Ingested Sep 10, 2026

$94.91

Cash price

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Discounted cash price

What a hospital charges a self-pay patient who pays directly, without going through insurance — usually well below the gross charge.

Example: A CT scan has a $3,200 gross charge but an $850 discounted cash price. Ask for it by name when scheduling — hospitals don't always advertise it up front.

Full explanation →

What you pay up front if you don't use insurance.

$142.50

Gross charge

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Gross charge (chargemaster price)

The hospital's full, undiscounted list price — pulled from its internal "chargemaster" price list. Almost no one actually pays this.

Example: A chest X-ray has a gross charge of $1,450. The same hospital's discounted cash price for the same X-ray is $180 — the gross charge mostly anchors negotiations, not what patients pay.

Full explanation →

The hospital's undiscounted list price — almost no one pays this.

$13.54 with BCBS - Anthem vs $25.00 with Health Plan of San Joaquin — same scan, same building. Share

Negotiated rates by payer
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Negotiated rate

The price a specific insurance plan agreed to pay the hospital for a service — it varies by insurer, and even by plan within the same insurer.

Example: The same knee MRI has a negotiated rate of $904 with one insurer's PPO plan and $1,509 with another's — identical hospital, identical scan.

Full explanation →

Payer
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Payer

The insurance company footing the bill — Aetna, UnitedHealthcare, Medicare, and so on.

Example: "Blue Cross Blue Shield" is the payer. Its negotiated rate for an MRI might be $904, while a different payer's negotiated rate for the same scan is $1,509.

Full explanation →
Plan
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Plan

The specific product an insurer sells — e.g. "Blue Cross PPO 500" — which sets your deductible, coinsurance and negotiated rates.

Example: Two people both insured by Aetna can owe very different amounts for the same MRI: $50 with an HMO plan's flat copay, or the full $1,200 toward a high-deductible PPO plan's unmet deductible.

Full explanation →
Negotiated rate vs. cash
BCBS - Anthem Commercial|Exchange $13.54 ↓ -86%
United Commercial|Select $14.54 ↓ -85%
Blue Shield CA Commercial|HMO $16.00 ↓ -83%
Blue Shield CA Commercial|PPO $16.00 ↓ -83%
Blue Shield CA Commercial|Exchange $16.00 ↓ -83%
United Commercial|Choice $16.69 ↓ -82%
BCBS - Anthem Commercial|All Other Plans $17.35 ↓ -82%
Health Net Commercial|All Plans $18.68 ↓ -80%
First Health Commercial|All Plans $18.75 ↓ -80%
United Commercial|HMO $19.61 ↓ -79%
Aetna Commercial|All Other Plans $20.43 ↓ -78%
Aetna Commercial|PPO $20.43 ↓ -78%
Aetna Commercial|HMO $20.43 ↓ -78%
BCBS - Anthem Medicare|All Plans $20.81 ↓ -78%
Health Net Medicare|All Plans $20.81 ↓ -78%
Care 1st Medicare|All Plans $20.81 ↓ -78%
Humana Medicare|All Plans $20.81 ↓ -78%
United Medicare|All Plans $20.81 ↓ -78%
Scan Health Plan Medicare|All Plans $20.81 ↓ -78%
Kaiser Medicare|All Plans $20.81 ↓ -78%
Aetna Medicare|All Plans $20.81 ↓ -78%
Blue Shield CA Medicare|All Plans $20.81 ↓ -78%
Kaiser Commercial|All Plans $21.25 ↓ -78%
Cigna Commercial|All Other Plans $22.38 ↓ -76%
Cigna Commercial|PPO $22.38 ↓ -76%
Multiplan Commercial|All Plans $24.50 ↓ -74%
BCBS - Anthem Medicaid|All Plans $25.00 ↓ -74%
Kaiser Medicaid|All Plans $25.00 ↓ -74%
Health Net Medicaid|All Plans $25.00 ↓ -74%
California Health & Wellness Medicaid|All Plans $25.00 ↓ -74%
Health Plan of San Joaquin Medicaid|All Plans $25.00 ↓ -74%

Visitor-reported prices

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Mayo immunoassay tumor antigen quantitative chromogranin a at other California hospitals

Hospital City Cash price Negotiated range
St. John's Camarillo Hospital Camarillo $13.13 $6.75 – $55.23
Banner Lassen Medical Center Susanville $15.93 $4.16 – $30.52
Petaluma Valley Hospital Petaluma $46.59 $20.39 – $169.87
Arroyo Grande Hospital Santa Maria $12.83 $5.60 – $53.63
French Hospital San Luis Obispo $11.75 $3.03 – $63.05
Mercy Hospitals – Bakersfield Bakersfield $32.08 $5.82 – $59.82
Bakersfield Memorial Hospital Bakersfield $31.73 $5.82 – $59.82
Queen of The Valley Medical Center Napa $46.59 $20.81 – $214.68

All California hospitals for this procedure →