Ammonia at Providence Cedars-Sinai Tarzana Medical Center

18321 Clark St, Tarzana, CA · Providence · · NPI 1821250762

Source: hospital's published price file ↗ · Published Apr 1, 2026 · Ingested Sep 11, 2026

$98.70

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.

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

$282.00

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.

$14.57 with Aetna vs $138.86 with Blue Shield — 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
Aetna Medicare Managed Care Plan $14.57 ↓ -85%
Humana Choicecare Medicare Managed Care Plan $14.86 ↓ -85%
Central Health Plan Medicare Managed Care Plan $16.03 ↓ -84%
La Care Health Plan Exchange $18.94 ↓ -81%
Blue Cross Anthem Vivity City Of La Other Commercial Plan $20.67 ↓ -79%
Blue Cross Anthem Vivity Non City Of La Other Commercial Plan $23.27 ↓ -76%
Cigna Ppo $25.66 ↓ -74%
Cigna Oap Hmo/Pos $25.66 ↓ -74%
Healthnet Ambetter Hmo $26.95 ↓ -73%
Unitedhealthcare All Commercial Plans $29.14 ↓ -70%
First Health/Coventry Coventry All Commercial Plans $29.14 ↓ -70%
Unitedhealthcare Select/Navigate Hmo $29.14 ↓ -70%
Healthnet Ambetter Ppo $31.18 ↓ -68%
Aetna All Commercial Plans $38.19 ↓ -61%
Blue Shield Epn/Ifp Benefit Exchange $38.89 ↓ -61%
Blue Shield Tandem Ppo/Blue High Performance Ppo/Epo $41.53 ↓ -58%
Blue Shield Hmo/Ppo/Epo $46.62 ↓ -53%
Blue Cross All Commercial Plans $91.58 ↓ -7%
Blue Shield Medicare Managed Care Plan $138.86 ↑ +41%

Visitor-reported prices

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Ammonia at other California hospitals

Hospital City Cash price Negotiated range
St. John's Camarillo Hospital Camarillo $222.95 $14.57 – $45.46
Banner Lassen Medical Center Susanville $40.69 $2.91 – $42.68
Petaluma Valley Hospital Petaluma $507.45 $14.28 – $118.98
Arroyo Grande Hospital Santa Maria $196.03 $14.57 – $45.08
Mark Twain Medical Center San Andreas $226.44 $14.57 – $246.96
French Hospital San Luis Obispo $179.54 $12.42 – $45.08
Mercy Hospitals – Bakersfield Bakersfield $249.32 $4.17 – $41.87
Bakersfield Memorial Hospital Bakersfield $246.26 $4.17 – $41.87

All California hospitals for this procedure →