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Split regime for dental · Last verified 2026-08-30

New Mexico prompt-pay law for dental claims

New Mexico runs more than one prompt-pay regime for dental claims. Which deadline and interest rate apply depends on the payer type, set out below.

NMSA 1978, §59A-16-21.1; §59A-16-21(B)

Read the statute text

Payment deadlines

Electronic claims
30 days (electronic clean claim, health plans)
Paper claims
45 days (manual clean claim, health plans)

Section 59A-16-21.1 gives health plans 30 days to pay a clean claim submitted electronically by an eligible provider and 45 days for one submitted manually (electronic prescription-drug claims from a pharmacy run on 14 days). If the plan cannot determine liability or refuses to pay, it must make a good-faith effort to notify the provider of the specific reasons within the same windows. The deadlines run only on clean claims — substantially complete, not materially deficient, and free of unusual circumstances requiring special treatment.

Interest and penalties

"A health plan shall provide for payment of interest on the plan's liability at the rate of one and one-half percent a month" on a clean claim not paid inside the 30- or 45-day window (§59A-16-21.1(B)). The remedy runs to eligible providers, defined as participating providers and providers the plan has credentialed, so an out-of-network dental office generally cannot use it. Keep the two New Mexico regimes apart: §59A-16-21(B) applies to insurers generally, gives them 45 days after required proof of loss, and sets interest at one and one-half times the prime lending rate, accruing from day 46 and inapplicable to claims in arbitration or litigation.

Does it apply to dental? Split regime for dental

Two regimes and an unresolved edge. Section 59A-16-21.1 binds a "health plan," defined as a health maintenance organization, nonprofit health care plan, provider service network, or third-party payer — plain insurers are not on that list and instead owe the §59A-16-21(B) duty. Article 16's own scope section names "prepaid dental services organizations" among the entities the article reaches, which is the dental hook; but whether a stand-alone dental carrier is a "health plan" for §59A-16-21.1 turns on the undefined term "third-party payer," and the statute does not settle it. Medicaid managed care organizations appear nowhere in either section.

Self-funded (ERISA) plans: A self-funded private-employer (ERISA) dental plan is generally beyond a state prompt-pay statute's reach: 29 U.S.C. § 1144(b)(2)(B) bars a state from deeming such a plan an insurer, and the courts have read that to keep state insurance regulation off it. The statute itself never uses the words self-funded or prompt pay, and the rule is not categorical — a self-funded governmental or church plan is not an ERISA plan at all, so state law can reach it; § 1144(b)(6) leaves multiple employer welfare arrangements open to state insurance law; and nothing in § 1144 addresses state enforcement against the third-party administrator or the network contract. Where the plan is a self-funded ERISA group health plan, the federal claims-procedure deadlines apply instead: a post-service benefit determination within 30 days (one 15-day extension), at least 180 days to appeal, and an appeal decision within 60 days (or two 30-day levels), under 29 CFR 2560.503-1.

Estimate the late-payment interest

Uses the verified New Mexico rule (NMSA 1978, §59A-16-21.1; §59A-16-21(B)). Estimate only — the statute's own accrual triggers control.

How the claim was submitted

New Mexico sets a different deadline for each, so this decides which day the field below counts from.

Estimated interest

$19.13

1.5%/mo (monthly tiers, prorated by days)

1.5% per month, and only to "eligible providers" — participating or plan-credentialed. An out-of-network dentist is generally outside this remedy, and a plain insurer runs on the separate §59A-16-21(B) regime instead (45 days after proof of loss, interest at 1.5 times the prime lending rate).

How we calculate this

Formula: claim × monthly tier rate × days in tier ÷ 30, summed across tiers, using simple (not compounded) interest as the statute states it. The rate and deadline come from NMSA 1978, §59A-16-21.1; §59A-16-21(B), read against the statute text linked in the sources on this page (last verified 2026-08-30). Accrual start dates, clean-claim status, safe harbors, and plan funding all affect the real figure — treat this as an estimate for the payer conversation, not a demandable amount.

Nothing you type here leaves your browser — the results are computed locally on this page.

Also in the statute

  • Electronic pharmacy claims for prescription drugs get a 14-day deadline — a 2021 change, and a reason not to state "30 days electronic" without the non-pharmacy qualifier.
  • Section 59A-16-21.1 was last amended by Laws 2021, ch. 45, §1, effective July 1, 2021.
  • Cite the Chapter 59A compilation (NMOneSource item 4438); the item-4359 URL that circulates is Chapter 2, the legislative-branch chapter.

Sources (statute text)

Last verified 2026-08-30 (research confidence: high). Dentovio is an independent publisher, not a law firm, insurance department, or government agency. This page was drafted with AI assistance and read against the primary sources linked here, with a per-claim verification record — quote, statutory pinpoint, and the URL actually opened — behind every deadline, rate, and applicability verdict in all fifty-one jurisdictions. It has not been reviewed by a credentialed attorney or dental billing specialist. These pages summarize state prompt-pay statutes as read against the official sources on the date shown, focusing on how each statute treats dental claims. Statutes change and their application turns on plan type, contract status, and claim facts. Educational reference only — not legal advice; confirm current law with the state insurance department or a licensed attorney before acting on a specific claim. How this data is verified