What Is Commercial Insurance Billing?
Commercial insurance billing submits claims to private health insurers — UnitedHealthcare, Aetna, Cigna, BCBS plans, Humana and regional carriers — that operate either fully-insured products regulated by state Departments of Insurance or self-funded employer-sponsored plans regulated federally under ERISA. KFF's 2025 Employer Health Benefits Survey puts 67% of covered workers in self-funded plans, so for employer-sponsored coverage the federal route is the common one. Compliance turns on plan-specific prior-authorization rules, the contracted fee schedule, knowing which appeal process the product is subject to, and the No Surprises Act for out-of-network emergency and ancillary claims.
- Funding decides the rulebook: fully-insured products answer to the state DOI, self-funded plans to ERISA
- 67% of covered workers are in self-funded plans — 80% at firms with 200+ workers (KFF EHBS 2025)
- No Surprises Act covers OON emergency, air ambulance, and OON ancillary care at in-network facilities
- ERISA requires a written reason, the plan provision relied on, and at least 180 days to appeal
Commercial Insurance Billing Services
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- No contract
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- Cancel anytime
Commercial billing is not one payer either. Each national carrier is a portfolio of products — UnitedHealthcare sells HMO, PPO and POS designs alongside self-funded arrangements where the employer sets the benefit design and the carrier only administers the claim — and the product, not the logo on the card, decides the fee schedule, the appeal route and the deadline. The structural line is funding. Employer-sponsored self-funded plans are governed federally by ERISA (29 USC 1001 et seq.); fully-insured products are regulated by the state Department of Insurance, which is where prompt-pay statutes and state external review live. KFF's 2025 Employer Health Benefits Survey found 67% of covered workers are in a self-funded plan, rising to 80% at firms with 200 or more workers, so for most employer-sponsored coverage the appeal path is federal rather than state. On top of both sits the No Surprises Act, which has applied since January 1, 2022 to out-of-network emergency care, out-of-network air ambulance and out-of-network ancillary services delivered at in-network facilities. This page covers how commercial billing plays out across prior-authorization gates, fee-schedule discipline, the ERISA-versus-state-DOI distinction that decides which appeal you are actually filing, state prompt-pay enforcement, and the federal IDR process for unresolved out-of-network disputes.
Commercial Insurance at a Glance
People covered by employer-sponsored insurance
154 million under age 65
Source: KFF Employer Health Benefits Survey 2025, verified 2026-09-17
Covered workers in self-funded plans
67%
Source: KFF Employer Health Benefits Survey 2025, verified 2026-09-17
Self-funded share at firms with 200+ workers
80% of covered workers
Source: KFF Employer Health Benefits Survey 2025, verified 2026-09-17
ERISA appeal window, group health
at least 180 days from the notice
Source: 29 CFR 2560.503-1(h)(3)(i), verified 2026-09-17
No Surprises Act protections in effect
January 1, 2022
Source: CMS, Ending Surprise Medical Bills, verified 2026-09-17
Federal IDR open-negotiation period
30 business days
Source: 45 CFR 149.510(b)(1)(i), verified 2026-09-17
Billing Challenges Specific to Commercial Insurance
Plan-product fragmentation within a single carrier
A national carrier is not one payer — it is many products with different networks, fee schedules and prior-authorization rules, plus self-funded employer plans it only administers. An HMO product and a broad-network PPO from the same carrier can price the same CPT code differently and route an appeal differently. The 270/271 eligibility response returns the plan and product detail, and missing that distinction is what lets a claim scrub clean and then adjudicate at an unexpected allowable, producing contractual-variance write-offs nobody posts as a denial. Capture the product at eligibility, not from the card logo.
ERISA versus state DOI: which appeal process applies
ERISA (29 USC §1001 et seq.) preempts state insurance regulation for employer-sponsored self-funded health plans. Self-funded plans follow ERISA section 503 and 29 CFR 2560.503-1: the notice must give the specific reason and reference the specific plan provisions it rests on, a group health plan must allow the claimant at least 180 days from receiving that notice to appeal, and section 502(a) provides the federal cause of action. A practice pursues that appeal as the patient's authorized representative under the plan's own procedures, not in its own right. Fully-insured plans, where the employer pays a premium to the carrier and the carrier bears the risk, are regulated by the state Department of Insurance — meaning state-specific external review processes, state prompt-pay laws, and state appeal timelines apply. Practices that misidentify the regulatory regime file appeals into the wrong process and miss the operative deadline.
Prior-authorization gates and step-therapy on injectables and imaging
Commercial carriers maintain extensive PA lists for advanced imaging (MRI, MRA, PET, CT beyond a frequency threshold), specialty injectables (biologics, oncology, immunotherapy), inpatient admissions, and outpatient surgical procedures above a dollar threshold. Step-therapy protocols require documented failure of preferred lower-cost agents before a non-preferred biologic is approved. Carriers also delegate whole service categories — radiology, cardiology, specialty drugs, behavioral health — to benefit-management vendors, and the delegation changes: which vendor holds which category for which product is a fact to read off the carrier's current prior-authorization list before submitting, never from last year's workflow note. A practice without a per-payer, per-service PA matrix keeps losing services that would have been approved on a five-minute upfront submission.
No Surprises Act and the federal IDR process for out-of-network claims
The No Surprises Act (Public Law 116-260, effective January 1, 2022) prohibits balance-billing patients for out-of-network emergency services, OON air ambulance, and OON ancillary services rendered at in-network facilities. What the qualifying payment amount (QPA) fixes is the patient's cost-sharing, not the provider's payment. The out-of-network rate is whatever the parties agree in open negotiation or, failing that, whichever of the two final offers the certified IDR entity selects. The 30-business-day open-negotiation period starts on the day the notice goes to the other party and the Secretary, IDR must then be initiated in the 4-business-day window that opens the first business day after negotiation closes, and the IDR entity weighs the QPA alongside the statutory factors — training and outcomes, market share, patient acuity and complexity, teaching status and case mix, and good-faith contracting history. Practices that never initiate simply keep whatever the plan paid.
State prompt-pay enforcement and clean-claim definitions
State insurance law sets the payment clock for fully-insured products, and the detail is where claims are lost. Texas Insurance Code 843.338 (HMOs) requires a determination on a clean claim by the 30th day after receipt when it was submitted electronically and the 45th day when it was not, with 1301.103 setting the same clocks for preferred provider benefit plans; the line is submission format, not plan type, and 843.342 carries the late-payment penalties. California rewrote its rule effective 1 January 2026 under AB 3275: Health and Safety Code 1371 now gives a DMHC-regulated plan 30 calendar days from receipt to reimburse a complete claim or give written notice that it is contested or denied, with 15 percent annual interest after that, and Insurance Code 10123.13 applies the same 30 calendar days to CDI-regulated insurers — the old working-day counts are gone. Every other state has its own numbers and they change, so read the current statute rather than a table. ERISA preempts state prompt-pay for self-funded plans, so the same carrier pays on a different clock depending on how the product is funded. Texas and California statute text read on 17 September 2026.
What We Handle for Commercial Insurance
Eligibility, plan-product identification, and benefits verification
270/271 verification at every visit with full plan-product detail capture, network status confirmation, deductible and out-of-pocket-max tracking, and identification of self-funded ERISA versus fully-insured products. Patient-responsibility estimation built from real benefit data rather than carrier averages.
Per-payer-per-service prior-authorization matrices
PA submission through the carrier's own provider portal or through whichever benefit-management vendor currently holds that service category for that product, checked against the carrier's published prior-authorization list rather than assumed. Step-therapy documentation packages built to clear preferred-agent failure requirements on first review.
ERISA §503 appeals for self-funded plan denials
Internal appeals to the ERISA plan administrator answering the specific plan provision the denial relied on, tracked against the plan's appeal window (at least 180 days from the notice for a group health plan), with escalation to external review where the plan is subject to it. We file as the patient's authorized representative under the plan's procedures.
State-DOI complaints and prompt-pay enforcement on fully-insured plans
State-prompt-pay tracking per fully-insured product, complaint filings to the state Department of Insurance when carriers chronically violate prompt-pay statutes, and interest-penalty calculation on late payments where state law provides the recovery vehicle.
No Surprises Act IDR submissions for OON emergency and ancillary claims
Open-negotiation initiation through the federal IDR portal, IDR submission packets built with QPA methodology challenge, and certified IDR entity tracking through baseball-style arbitration. NSA dispute outcomes captured against the contracted-rate baseline so leakage is measurable.
Contracted fee-schedule reconciliation and underpayment recovery
Posted-payment-versus-contracted-allowable variance analysis at the line-level, contractual-adjustment audit against carrier fee schedules, and underpayment recovery letters built to the carrier's internal payment-dispute pathway. Repeat-offender carrier patterns surfaced for renegotiation discussions at contract renewal.
Codes Frequently Billed to Commercial Insurance
| Code | Description |
|---|---|
| 99213 | Established patient office visit, low complexity (most-billed commercial code) |
| 99214 | Established patient office visit, moderate complexity |
| 99215 | Established patient office visit, high complexity |
| 99203 | New patient office visit, low complexity |
| 99204 | New patient office visit, moderate complexity |
| 99205 | New patient office visit, high complexity |
| 99381 | Initial preventive medicine, infant under 1 year (commercial preventive) |
| 99391 | Periodic preventive medicine, infant under 1 year (established) |
| 90834 | Psychotherapy, 45 minutes (commercial behavioral-health) |
| 97110 | Therapeutic exercise, 15 minutes (commercial PT/OT timed) |
Last updated: 2026-10-02
Common Questions
Common questions about commercial insurance billing services.
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Request ReviewWhat is the difference between a fully-insured and a self-funded commercial plan?
A fully-insured plan is one where the employer pays a premium to the insurance carrier (UnitedHealthcare, Aetna, Cigna, BCBS), and the carrier bears the financial risk of paying claims. Fully-insured plans are regulated by the state Department of Insurance, which means state prompt-pay laws, state appeal processes, and state benefit mandates apply. A self-funded plan is one where the employer pays claims directly out of company funds and contracts with a carrier or TPA only for claim-administration services (UMR, Aetna-ASO, Cigna-ASO, BCBS-ASO). Self-funded plans are regulated under ERISA, which preempts state insurance regulation. Among covered workers, self-funding is the majority position and scales with employer size: KFF's 2025 Employer Health Benefits Survey found 67% of covered workers in a self-funded plan, 80% at firms with 200 or more workers against 27% at firms with 10 to 199. The 270/271 eligibility response and the back of the patient's card are where you identify which regime applies before you pick an appeal route.
Why does ERISA matter for commercial billing?
ERISA (29 USC §1001 et seq.) preempts state insurance regulation for employer-sponsored self-funded health plans, which means the appeal process, denial-notification requirements, and recovery pathways are federal rather than state. Under ERISA section 503 and 29 CFR 2560.503-1, the notice of an adverse benefit determination must set out the specific reason or reasons and reference the specific plan provisions on which it is based, and a group health plan must give the claimant at least 180 days after receiving that notice to appeal, with the review completed in set timeframes. ERISA §502(a) provides the federal cause of action when the plan denies coverage in violation of the plan terms. Practices billing self-funded plans must follow ERISA appeal processes — filing into a state external-review process for an ERISA self-funded plan typically gets the appeal dismissed for lack of jurisdiction.
How does prior authorization work across commercial carriers?
Each commercial carrier maintains a prior-authorization list specifying which services require approval before rendering. Common categories include advanced imaging (MRI, CT, PET, MRA beyond frequency thresholds), specialty injectables and biologics, inpatient admissions, outpatient surgeries above a dollar threshold, and out-of-network referrals. Carriers also delegate categories such as advanced imaging, cardiology, specialty drugs and behavioral health to benefit-management vendors, and those delegations move between vendors over time — so the submission route comes off the carrier's current prior-authorization list, either its own provider portal or the vendor that holds that category today. PA approvals must be documented in the medical record and referenced on the claim submission to prevent post-service denials.
What is the No Surprises Act and how does it affect commercial billing?
The No Surprises Act (Public Law 116-260, effective January 1, 2022) prohibits balance-billing patients for out-of-network emergency services, out-of-network air ambulance, and out-of-network ancillary services rendered at in-network facilities (anesthesiology, radiology, pathology, neonatology, assistant surgeons, hospitalists). Patient cost-sharing is calculated as if the care had been in network. The qualifying payment amount is what that cost-sharing is generally built on — it is not the provider's payment. The out-of-network rate is settled by agreement in open negotiation or, failing that, by the federal Independent Dispute Resolution process, where the certified IDR entity picks one of the two final offers as the out-of-network rate.
What is the federal IDR process and when do we use it?
The federal Independent Dispute Resolution process under 45 CFR 149.510 settles payment disputes for No Surprises Act claims when the provider and plan cannot agree on the payment amount. It begins with a 30-business-day open-negotiation period, which starts on the day the initiating party sends the open-negotiation notice, with the required remittance documentation, to the other party and to the Secretary. The party receiving it must respond by the 15th business day. If no agreement is reached, either party initiates IDR during the 4-business-day period beginning the first business day after the open-negotiation period ends. The parties try to agree on a certified IDR entity, or the Secretary selects one. Each side submits a final offer, and the entity must select the offer it determines best represents the value of the item or service, weighing the qualifying payment amount together with the permitted factors — the provider's training, experience and outcomes, market share, patient acuity and service complexity, teaching status and case mix, and good-faith contracting history — and it may not consider billed or usual-and-customary charges. The non-prevailing party pays the certified IDR entity fee; where each side prevails in an equal number of batched determinations, the fee is split. Text read at 45 CFR 149.510 on 17 September 2026.
What are state prompt-pay laws and when do they apply?
State prompt-pay laws set the window in which a fully-insured carrier must act on a clean claim, usually with interest for late payment — and the details are specific enough that a generic table will lose you money. Texas Insurance Code 843.338 gives an HMO until the 30th day after receipt for an electronically submitted clean claim and the 45th day for a non-electronic one, with 1301.103 running the same clocks for preferred provider benefit plans and 843.342 setting the penalties. California, since 1 January 2026 under AB 3275, requires a DMHC-regulated plan to reimburse a complete claim or give written notice that it is contested or denied within 30 calendar days of receipt under Health and Safety Code 1371, with 15 percent annual interest afterwards, and Insurance Code 10123.13 imposes the same deadline on CDI-regulated insurers. Other states differ and amend their codes without notice, so the operative question is always which statute governs this product today. None of it reaches self-funded employer plans, which ERISA preempts. Texas and California statute text read on 17 September 2026.
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