HCPCS J3399 at Seattle Children's Hospital

Injection, onasemnogene abeparvovec-xioi, per treatment, up to 5x10^15 vector genomes

Seattle Children's Hospital, Seattle

Description from CMS's HCPCS Level II code file.

What Seattle Children's Hospital publishes for this code: as an outpatient

Seattle Children's Hospital’s prices for HCPCS J3399, as an outpatient
Who pays	Hospital’s fee (lowest – highest)	Doctor’s fee the hospital lists
Medicaid managed careInsurer rates	$233,806 – $631,0362 plans	—
Medicaid (state program)Insurer rates	$719,225 – $1,941,1721 plan	—
UnknownInsurer rates	$719,225 – $1,941,1723 plans	—
Cash pricePaying yourself, without insurance	$719,225 – $1,941,172	—
List priceBefore any discount; few people pay it	$719,225 – $1,941,172	—

Lowest and highest amounts Seattle Children's Hospital lists for this code as an outpatient, including lines it lists for both settings or without saying which. This is one line of a bill; most care brings several.

Bills to expect

The hospital’s fee is the price above. Doctors usually send their own bills. Their amounts here are what original Medicare allows in Seattle (King County) for 2026, and a private-plan estimate of 118% to 179% of that (the range found across studies of what insurers pay doctors). Those are estimates, not quotes.

Bills to expect for HCPCS J3399 at Seattle Children's Hospital
Bill	What it’s for	Original Medicare allows	Private plan estimate
Hospital's feeThe hospital	The drug, per billing unit	—	The price above

Drug prices are per billing unit (the unit is in the code's name, such as "per 10 mg"). Your dose decides how many units you're billed, so the total depends on your prescription, and giving the drug may be billed separately.

Original Medicare amounts are only for people on original Medicare. Your share depends on your plan’s deductible, copay and coinsurance.

Compare HCPCS J3399 at every Washington hospital, with Medicare’s reference amounts.