My health insurance paid less than I expected. Is there a way to challenge it?

Health insurancePaid too littleChecked Nov 6, 2026

From K.Actuary, founded by Sangmin Kwon, ASA · sources checked 2026-11-06 · Source: govinfo · 45 CFR 147.136 · § 147.136(b)(2)(ii)(C), (E)(2) View original ↗

In short

You can ask the plan for the codes.
If the plan paid only part, read the notice for how to appeal.
The sources have no rule on how much a plan must pay.

What this means

The sources here do not say how much a plan must pay for a service. That depends on your plan's coverage terms.

They do say you can ask the plan, as soon as practicable, for the diagnosis and treatment codes and what they mean. The plan must also give you, free of charge, any new or additional evidence it considered or relied on [1].

CMS says your insurer may decide not to pay part or all of a claim. If you think that decision violates the No Surprises Act, appeal your bill. Follow the process in your plan's documents and denial notices [2].

Your next step

Compare the explanation of benefits with the bill. Ask the plan in writing for the codes. If the amount is wrong, appeal using the steps in the notice. The sources give no deadline here; your notice states yours.

Check it yourself

Whether the amount paid is right under your plan: "Don't know yet" - the sources do not include plan benefit terms or fee schedules.

Where this comes from (2)

[1] govinfo · 45 CFR 147.136 · § 147.136(b)(2)(ii)(C), (E)(2) · checked 2026-11-06
The plan or issuer must provide the claimant, free of charge, with any new or additional evidence considered, relied upon, or generated by the plan or issuer … The plan and issuer must provide to participants, beneficiaries and enrollees, as soon as practicable, upon request, the diagnosis code and its corresponding meaning, and the treatment code and its corresponding meaning
[2] CMS · Dispute a medical bill · FAQ › What do I do if I don't qualify · checked 2026-11-06
Your insurer may have decided not to pay part or all of a claim. If you think this decision violates the No Surprises Act, appeal your bill. Follow the process described in your plan’s documents and denial notices.

How we found this

We matched your question to 2 official sources, quoted the exact lines, and re-checked each quote against its source on 2026-11-06.

What we don’t know yet

Your own plan or notice may say something different. If your letter cites another rule, send it and we will look again.

Every answer is checked against the official rule it quotes.

Information only — not legal advice. Your plan, insurer or agency decides.

This answer quotes the official sources listed above, with the date we checked them. Your own policy, notice and state rules control. We are not your lawyer or your insurer. We don’t file, argue or negotiate claims for you — you send any letter or form yourself.

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