Workers' compensation billing operates in its own universe. No standard health insurance rules apply. No CMS-1500 in most states. No assignment of benefits. No EOB in the way you're used to. And the entity you need approval from isn't the insurance company — it's the adjuster, a specific human being who can approve or deny treatment for your patient without answering to anyone else's timeline.
If your practice takes workers' comp patients, here's what you actually need to know in 2026 to get paid without the AR dragging on for months.
The biggest mindset shift: in workers' comp, there's no universal federal framework. Every state has its own workers' compensation system, fee schedule (or lack of one), forms, timelines, and dispute resolution process. What works in Texas doesn't work in California. California's fee schedule is among the most detailed in the country. Some states, like Indiana, don't have a binding fee schedule at all — you negotiate.
| Factor | Health Insurance | Workers' Comp |
|---|---|---|
| Fee schedule | CMS or contracted rate | State-specific or negotiated |
| Claim form | CMS-1500 or UB-04 | State WC form (varies) or CMS-1500 |
| Approval authority | Payer's UR department | Claims adjuster |
| Timely filing | 90–365 days typical | 30–90 days in many states |
| Patient cost-share | Copay, deductible, coinsurance | None — employer/insurer pays 100% |
| Medical necessity criteria | Evidence-based guidelines | Work-relatedness + treatment guidelines |
The claims adjuster controls authorization, payment, and the speed of your AR. They're not a faceless payer — they're a person managing a caseload of injured workers and making daily decisions about treatment approval.
Get the adjuster's name and direct contact information at the first visit. Confirm the claim number. Send treatment plans proactively — don't wait for them to ask. Adjusters who feel like you're keeping them in the loop approve things faster. Adjusters who only hear from you when there's a problem slow everything down.
Most states with workers' comp fee schedules base them on a percentage of Medicare rates — typically 110% to 200% of Medicare, depending on the state and service type. California uses a relative value scale called the OMFS (Official Medical Fee Schedule) with its own RVUs. Florida's fee schedule is set by statute and updated periodically. Texas has a fee schedule administered by the Division of Workers' Compensation.
States without binding fee schedules (Tennessee, Indiana, Iowa, among others) allow you to bill your usual and customary charges — which means you negotiate, and knowing the adjuster matters even more.
Some states give you 30 days from the date of service to submit a workers' comp bill. Miss that window and the claim is denied — and the statute of limitations on late filing defenses in workers' comp is often absolute. Build a workers' comp billing queue that runs separately from your standard AR and flag every claim for filing within 2 weeks of service.
Authorization in workers' comp isn't called "prior auth" — it's called "treatment authorization request" or just "authorization." And unlike health insurance, where you submit to a central UR department, workers' comp auth often goes directly to the adjuster or to a nurse case manager.
Physical therapy, specialist referrals, MRIs, surgery, and pain management procedures almost always need authorization. Emergency treatment doesn't require pre-auth, but you need to notify the adjuster within 24–48 hours in most states.
When there's a dispute about causation, treatment necessity, or maximum medical improvement (MMI), the insurer may order an Independent Medical Examination. As the treating physician, you may be asked to provide records and will sometimes need to respond to the IME report in writing.
IME billing is separate — if you're performing IMEs (not treating the patient but evaluating them), those bill under specific HCPCS or CPT codes depending on the state and typically don't go through the usual authorization process. Rates are negotiated directly.
In states that allow it (California is the primary example), providers can file a lien against a workers' comp settlement when payment has been delayed or disputed. Lien billing is its own subspecialty — it involves recording a lien with the workers' comp appeals board, waiting for the case to settle, and negotiating payment from the settlement proceeds. Some practices use lien billing services for this. Know whether your state allows it before you invest time treating a patient with a disputed claim.
Every note for a workers' comp patient needs to document the connection between the treatment and the work-related injury. The diagnosis must be tied to the mechanism of injury. Treatment goals should reference functional restoration and return to work — not just symptom management.
"Return to work" is the central outcome workers' comp cares about. Your notes should reflect that framing. If you're treating chronic pain but the patient hasn't worked in 18 months and there's no documented functional improvement, expect the adjuster to start questioning whether continued treatment is necessary.
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