Who has to pay after a code 150 denial?

Who owes depends on the details. The letters in front of the number matter: CO (contractual obligation) usually means an in-network provider must absorb it, while PR (patient responsibility) means the plan says you owe it.

How long do I have to appeal?

It depends on your coverage: 180 days for most employer and marketplace plans, 120 days for Original Medicare, about 90 days for Medicaid (varies by state), and only 65 days for Medicare Advantage. Set your deadline clock before you do anything else.

Denial code 150 · CO-150 / PR-150 · translated

Denial code 150: what it means — and how to fight it

Denial code 150 (shown on your EOB as CO-150 or PR-150) means: “Payer deems the information submitted does not support this level of service.” In plain English: Downcoding — they think the visit was billed at a higher intensity than the records justify, and they're paying less.

medium appealability Who owes depends on the details

What they're really saying

“Payer deems the information submitted does not support this level of service.”

Downcoding — they think the visit was billed at a higher intensity than the records justify, and they're paying less.

Your odds

Worth fighting — many of these get fixed.

Documentation usually settles it; ER downcoding faces the prudent layperson rule.

Fewer than 1 in 100 denied claims are ever appealed. When people do appeal, roughly 4 in 10 win the first round — and independent external review overturns 40–50% of what reaches it.

How to appeal a code 150 denial

Decode. You just did — this page is step one.
Set your clock. 180 days for most employer and marketplace plans, 120 for Original Medicare, ~90 for Medicaid, only 65 for Medicare Advantage.
Urgent? If this is care you still need, call and request an expedited appeal — they must decide within 72 hours.
Ask the provider to send the visit documentation that supports the billed level. The provider submits full documentation supporting the billed level. For ER visits, cite the prudent layperson standard and demand the reviewer's credentials.
Send it certified. Letter plus evidence, keep copies of everything.
Escalate. Denied again? Independent external review — a doctor who doesn't work for your insurer decides.

Do it in minutes, free

The AppealClock tool translates your denial, drafts your appeal letter, computes your exact deadline — and watches the clock so you don't have to. No account. Your medical details never leave your device.

Start your appeal & set your clock →

Common questions

What does denial code 150 mean?: Downcoding — they think the visit was billed at a higher intensity than the records justify, and they're paying less.
Can I appeal a CO-150 or PR-150 denial?: Yes. Appealing is free and it is your legal right. For this code the odds are medium: Documentation usually settles it; ER downcoding faces the prudent layperson rule. Fewer than 1 in 100 denials are ever appealed — insurers count on silence.
Who has to pay after a code 150 denial?: Who owes depends on the details. The letters in front of the number matter: CO (contractual obligation) usually means an in-network provider must absorb it, while PR (patient responsibility) means the plan says you owe it.
How long do I have to appeal?: It depends on your coverage: 180 days for most employer and marketplace plans, 120 days for Original Medicare, about 90 days for Medicaid (varies by state), and only 65 days for Medicare Advantage. Set your deadline clock before you do anything else.