Guide

Prompt-pay statutes: interest the payer owes you

Summary

Most states have a prompt-pay law requiring an insurer to pay a clean claim within a set number of days or add interest for paying late — but the deadline, the interest rate, and even whether the law applies at all vary by state and by plan type. A self-funded employer plan is usually exempt, governed by federal ERISA law instead of the state statute, which is the first thing worth checking before assuming interest is owed.

By Gale Editorial · Updated 2026-07-26. Every figure cited to a dated source. How we write.

Do state prompt-pay laws get me interest on a late claim?

In most states, yes — a prompt-pay statute requires an insurer to pay a properly submitted, clean claim within a set number of days, or add interest to the payment when it's late, and the mechanism exists specifically to give a provider real leverage against a payer sitting on money. State-varies is the honest frame for this whole topic, because that specific number is genuinely different in every state.

The state's own department of insurance is where the actual current deadline and interest rate for that state live — not a national summary, since prompt pay is a state insurance-law creature, coordinated loosely through NAIC model legislation that individual states adapt into their own statutes 1Ref 1National Association of Insurance Commissioners (2026).National Association of Insurance Commissioners.That state insurance departments regulate fully-insured plans and that the NAIC coordinates model laws states adapt into their own statutes, including prompt-pay laws, and that the specific deadlines and interest rates genuinely differ by state.. A solo who treats this as a one-time lookup rather than a standing reference tends to under-collect quietly, claim after claim, without ever noticing the pattern.

Not every plan is covered: the ERISA exemption

The single most important branch point before assuming a prompt-pay claim exists at all is whether the patient's plan is fully insured or self-funded. State insurance departments regulate fully-insured plans, which is where state prompt-pay statutes apply 1Ref 1National Association of Insurance Commissioners (2026).National Association of Insurance Commissioners.That state insurance departments regulate fully-insured plans and that the NAIC coordinates model laws states adapt into their own statutes, including prompt-pay laws, and that the specific deadlines and interest rates genuinely differ by state..

A self-funded employer plan is governed by federal ERISA law rather than state insurance law, which is exactly why state prompt-pay protections — along with many other state insurance-law protections — often do not reach those plans at all; ERISA sets its own claims-and-appeals framework instead, without the same interest-on-late-payment mechanism most state statutes carry 2Ref 2U.S. Department of Labor (2026).ERISA.That self-funded employer plans are governed by ERISA rather than state insurance law, which is why state prompt-pay statutes often do not reach them, and that ERISA sets its own claims-and-appeals framework for those plans instead..

Confirming which kind of plan you're dealing with

Before calculating interest owed or citing a state statute in a letter to a payer, confirming the plan type is the actual first step, since a demand letter citing a state prompt-pay statute against a self-funded ERISA plan is citing a law that plan may not be subject to at all.

The patient's insurance card alone rarely settles the question; the Summary Plan Description, or a direct call to the employer's HR or benefits administrator, is the reliable way to confirm whether a specific patient's coverage is state-regulated or self-funded before assuming either way. Building that one check into intake, rather than discovering the plan type only when a claim is already running late, saves rewriting a letter that cited the wrong framework.

Finding your own state's specific deadline and rate

Once a claim is confirmed to be with a state-regulated, fully-insured plan, the state's own department of insurance publishes the actual prompt-pay statute — the number of days counted as a clean claim, the interest rate applied to a late payment, and how a provider actually claims it.

None of those figures transfer from one state to the next, so the only reliable source is that state's own statute or its department of insurance's public guidance, not a number remembered from a different state or from a colleague's practice in another jurisdiction. A practice that bills across more than one state needs a separate note for each one, since a deadline confirmed for one state says nothing reliable about the next.

What counts as a 'clean claim' in the first place

Most prompt-pay statutes only start their clock once a claim is clean — complete, correctly coded, and free of the kind of missing information that would trigger a correctable denial — which means a claim bounced back for a correctable error effectively restarts the clock rather than accruing interest from the original submission date.

That makes claim-scrubbing before submission not just a first-pass-acceptance strategy but also a prompt-pay strategy: a clean claim on the first submission is the one most likely to actually trigger the interest clock a state statute provides.

Prompt pay is not the same clock as timely filing

It's easy to conflate two different deadlines that run in opposite directions. Timely filing is the provider's own deadline to submit a claim to the payer in the first place — Medicare's own timely filing rule, for instance, is spelled out in CMS's public Medicare Claims Processing Manual 3Ref 3Centers for Medicare & Medicaid Services (2026).Internet-Only Manuals (IOMs).That CMS program instructions live in the public Internet-Only Manuals, including the Medicare Claims Processing Manual (Pub. 100-04) with the 12-month Medicare timely-filing rule — used here to distinguish the provider's own filing deadline from a state prompt-pay deadline owed by the payer..

Prompt pay runs the other direction entirely: it's the payer's deadline to pay a claim the provider already submitted on time. Confusing the two means either missing your own filing deadline while worrying about the payer's, or assuming a payer's slow payment is somehow your fault to fix rather than theirs to answer for.

Building the tracking habit before you need it

Waiting until a specific claim feels overdue to start tracking payment dates means starting from a blank slate under time pressure, which is exactly when a solo is least likely to actually calculate interest owed correctly. A simple running log — submission date, payment date, and the gap between them for at least the claims from the practice's largest few payers — turns a vague sense that a payer runs slow into a specific, provable number the moment it's actually needed.

The habit pays off even for claims that never end up needing a prompt-pay letter: the same log surfaces which payer is consistently slower than the others, which is useful information for a fee-schedule negotiation or a network-participation decision entirely apart from any single late claim.

Actually collecting the interest

Most prompt-pay statutes place the burden on the payer to calculate and add interest automatically, but in practice a provider who never asks rarely receives it — tracking payment dates against the submission date for a sample of claims, and flagging the ones that ran past the state's own deadline, is what turns a statutory right into actual money.

A short, dated letter citing the specific state statute and the specific claim's submission and payment dates, sent to the payer's provider-relations contact rather than a general claims address, tends to be the fastest way to actually collect interest a payer owes but did not calculate on its own.

Common questions

In most states, yes — a prompt-pay statute requires an insurer to pay a clean claim within a set number of days or add interest when it pays late. But the actual deadline and interest rate differ by state, and the law generally only reaches fully-insured plans regulated by that state's department of insurance, not every type of coverage.

Because the plan is self-funded by the patient's employer rather than fully insured. Self-funded employer plans are governed by federal ERISA law instead of state insurance law, which is exactly why many state prompt-pay protections don't reach them — ERISA sets its own separate claims framework without the same interest mechanism most state statutes provide.

Through that state's own department of insurance, which publishes the actual statute — the number of days counted as a clean claim and the rate applied to a late payment. Neither figure transfers from one state to another, so a number remembered from a different state, or a colleague's practice elsewhere, isn't a reliable substitute for checking your own state's rule directly.

They run in opposite directions. Timely filing is the provider's own deadline to submit a claim to the payer, and Medicare's version of that rule is spelled out in CMS's public claims processing manual. Prompt pay is the payer's deadline to pay a claim the provider already submitted on time — confusing the two means worrying about the wrong party's clock.

In practice, rarely automatically. Most statutes place the calculation burden on the payer, but a provider who doesn't track submission and payment dates against the state's own deadline and flag the late ones tends not to actually receive interest owed. A short letter citing the specific statute and the specific claim's dates is usually what moves it.

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References

1.National Association of Insurance Commissioners (2026). National Association of Insurance Commissioners. NAIC. linkThat state insurance departments regulate fully-insured plans and that the NAIC coordinates model laws states adapt into their own statutes, including prompt-pay laws, and that the specific deadlines and interest rates genuinely differ by state.
2.U.S. Department of Labor (2026). ERISA. U.S. Department of Labor. linkThat self-funded employer plans are governed by ERISA rather than state insurance law, which is why state prompt-pay statutes often do not reach them, and that ERISA sets its own claims-and-appeals framework for those plans instead.
3.Centers for Medicare & Medicaid Services (2026). Internet-Only Manuals (IOMs). Centers for Medicare & Medicaid Services (CMS). link ✓That CMS program instructions live in the public Internet-Only Manuals, including the Medicare Claims Processing Manual (Pub. 100-04) with the 12-month Medicare timely-filing rule — used here to distinguish the provider's own filing deadline from a state prompt-pay deadline owed by the payer.

https://www.gale.care/for-providers/dn-prompt-pay-laws · 3 sources. Competitor details are cited to dated public sources and maintained as they change; figures are estimates, not commitments. Synthetic demonstration.

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