How do you bill workers' comp and employer services in urgent care?
Decide who owes the bill before you code the visit. Treatment of a work injury goes to the employer's workers' comp carrier, an exam the employer requires goes to the employer on an invoice, and an illness unrelated to work goes to the patient's health plan.
Written by Salman Saeed, CEO and Co-Founder · Reviewed by a Certified Medical Coder · 
In short: occupational medicine is three payers hiding in one service line. Sort every visit into workers' comp, employer-direct or health plan at registration, split mixed visits into separate encounters, and keep Medicare and Medicaid out of anything an employer or carrier owes.
Who pays for each kind of occupational visit?
Occupational medicine mixes three payers, and the code does not tell you which one applies. The reason for the visit does. Sort each service by who asked for it and why.
| Service | Bill to | Rule behind it |
|---|---|---|
| Treatment of a work injury | The employer's carrier or self-insured employer, under a claim number | CMS states that workers' compensation pays primary for job-related illness or injury |
| Exam the employer requires, such as a pre-employment or DOT exam | The employer, on an invoice under your service agreement | Medicare excludes exams required by businesses and other third parties (42 CFR 411.15(a)(2)); a commercial plan's exclusions are in its own manual |
| Drug or alcohol test required by a DOT rule | The employer or its testing administrator, under your contract | 49 CFR Part 40 sets how DOT tests are conducted and says nothing on who pays you |
| Illness or injury not related to work | The patient's health plan, or the patient if self-pay | Normal CMS-1500 billing, see the urgent care billing guide |
| Follow-up for an open work injury | The same carrier and claim number, unless the carrier has denied or closed the claim | Hold the bill and call the adjuster when the status is unclear |
The state decides fee schedules, forms and filing clocks for workers' compensation. Nothing here sets a state rule, so load the state's own rules into the billing setup and read the workers' comp billing service page for how those differ.
What does the front desk need to capture?
Ask why the patient came and who sent them before anyone opens a chart. The answer chooses the payer type in the practice management system, and a wrong choice at this step is the root of most occupational denials.
- Ask whether the visit is for an injury or illness from work, an exam or test the employer requested, or something else.
- For an injury, record the employer, the date and place of injury, the carrier, the claim number and the adjuster's phone. No claim number yet means the bill waits, with the date the carrier was notified written in the account notes.
- For an employer request, get the employer's name, the person who authorized the service and the written referral, order or purchase number your agreement requires.
- Scan the referral or authorization into the account so billing can attach it to the invoice.
- Create one payer type per answer: workers' comp, employer-direct and health plan. Never reuse the patient's health insurance as the default for the first two.
If the employee also wants a health plan claim for something unrelated, treat that as a second encounter with its own documentation and its own payer.
What does a DOT physical add to the paperwork?
A DOT physical is a federal commercial driver exam with its own forms, examiner rules and record clocks. The employer is the usual payer, but the clinic carries the compliance duties, and those are what an auditor asks about.
| Requirement | What 49 CFR says | What it means for the clinic |
|---|---|---|
| Who may examine | The exam must be done by a medical examiner listed on the National Registry of Certified Medical Examiners (391.43(a)) | Schedule only listed examiners for DOT slots |
| Forms | Results go on Medical Examination Report form MCSA-5875, and a qualified driver gets a Medical Examiner's Certificate on form MCSA-5876 (391.43(f), (h)) | Build the visit template around both forms |
| Results to FMCSA | The examiner transmits the results form MCSA-5850 by midnight of the next calendar day (391.43(g)(5)(i)(B)) | Make the upload a same-day task, not a billing task |
| Copy for the employer | The examiner gives a copy of the certificate to a prospective or current employing motor carrier that asks for it (391.43(g)(2)) | Release it to the employer named on the referral |
| Record retention | The examiner keeps the report and a copy of the certificate on file for at least 3 years (391.43(i)) | Set 3 years as the minimum retention for the account |
| How long it lasts | Most drivers must be re-examined if their last certification was more than 24 months ago (391.45(b)) | Use it for recall reminders to the employer, not as a billing rule |
Billing follows the service agreement, not an insurance claim form. Invoice the employer for the exam, tie the line to the referral number and keep the dated proof that the results were transmitted.
What if one visit covers an employer exam and treatment?
Document and bill each part to its own payer. The employer paid for the exam, so a complaint the patient raises during it is a separate service that needs its own note, its own diagnosis and its own payer.
A driver comes for an employer-requested DOT exam and mentions a wrist injury from loading a truck last week.
When a procedure shares a claim with an evaluation, the modifier 25 page explains when the visit is separately identifiable. Do not use a modifier to merge an employer-paid exam and a carrier-paid treatment onto one claim.
What changes when the patient has Medicare or Medicaid?
Medicare does not pay for services that workers' compensation has paid or can reasonably be expected to pay (42 CFR 411.40(b)(1)). Under 42 CFR 411.43(a) the beneficiary has to take the steps needed to get workers' comp payment, and Medicare does not pay until those remedies are used up, except as 411.45 allows.
Medicare also excludes examinations required by insurers, businesses, government agencies and other third parties (42 CFR 411.15(a)(2)). An employer-required exam for a Medicare patient is an employer invoice, not a Medicare claim.
State Medicaid agencies must reject a claim and return it to the provider when third party liability is established when the claim is filed (42 CFR 433.139(b)(1)). Federal rules define a third party as any entity that is or may be liable to pay for the care (42 CFR 433.136), so a workers' comp carrier counts. See the Medicaid payer page for the plan side.
Which denials hit occupational claims, and what fixes them?
Read the CARC on the remittance first. These are the codes we see on occupational accounts, with wording from the X12 list.
| CARC | X12 wording (short) | Usual cause | Fix |
|---|---|---|---|
| 19 | Work-related injury or illness, the liability of the workers' comp carrier | Work injury sent to the health plan | Rebill the carrier with the claim number |
| 22 | May be covered by another payer per coordination of benefits | Plan has an open work injury on file | Confirm the injury status, then rebill the right payer |
| 109 | Not covered by this payer; send to the correct payer | Employer-required exam sent to insurance | Invoice the employer |
| 16 | Lacks information or has a billing error | Missing claim number, employer or date of injury | Add the data and resubmit |
| 29 | Time limit for filing has expired | Bill held for a claim number too long | Track held bills weekly, see the timely filing limits |
A held workers' comp bill still runs against a filing clock. Track the oldest one by employer every week, and know the state's limit before it expires.
What is the monthly check for occupational billing?
- Every workers' comp visit has a carrier, a claim number and a date of injury, or a dated hold note.
- No employer-requested service sits in an insurance queue.
- Employer invoices are tied to referral numbers, and unpaid ones are followed up by the employer's contact.
- DOT exam records show the transmission date and a retained copy.
- Mixed visits have two notes and two payers.
- Self-pay employees who decline a health plan claim get the steps in self-pay pricing and estimates.
- The place of service on every claim matches the payer rule in POS 20 vs POS 11.
How does Nucleus Align handle occupational billing?
We separate workers' comp, employer-direct and health plan encounters at charge entry, send claims within 24 hours of charge entry and work denials within 48 hours. Learn about workers' comp and no-fault billing or book a call.
- CMS Medicare Secondary Payer overview (workers' compensation pays primary) · CMS
- 42 CFR 411.15, Particular services excluded from coverage · eCFR
- 42 CFR 411.40, General provisions (workers' compensation) · eCFR
- 42 CFR 411.43, Beneficiary's responsibility with respect to workers' compensation · eCFR
- 42 CFR 433.136 and 433.139, Third party liability · eCFR
- 49 CFR 391.43 and 391.45, Medical examination and certification · eCFR
- 49 CFR 40.1, Who does this regulation cover · eCFR
- X12 Claim Adjustment Reason Codes · X12
We check every rule, code and deadline against the official source. See our editorial policy.
Common questions
Straight answers from the team that does the work.
Ask a billing lead directly. A 20-minute call, Monday to Friday, 9am to 5pm Eastern.
01How do you bill workers' comp and employer services in urgent care?
Bill the employer's workers' comp carrier for treatment of a work injury, using the carrier's claim number. Invoice the employer for exams and tests it requires, under your service agreement. Bill the patient's health plan only for care unrelated to work. Decide the payer at registration, from the reason for the visit.
02Who pays for a DOT physical?
The employer usually pays under its agreement with the clinic. DOT rules set who may examine and which forms to use, but they do not make an insurance plan the payer. Medicare excludes exams that businesses require, so do not send one to Medicare.
03Can urgent care bill workers' comp and health insurance for the same visit?
Not for the same service. If one visit covers a work injury and an unrelated illness, document each in its own note and bill each to its own payer. A work injury sent to a health plan commonly returns as CARC 19 or 22.
04What does CARC 19 mean on an urgent care claim?
CARC 19 says the injury or illness is work-related and is the liability of the workers' compensation carrier. Rebill the carrier with the employer, date of injury and claim number. If no claim exists, hold the bill and track its filing clock.
05What information must be collected for an employer-requested service?
Collect the employer's name, the person who authorized the service, the written referral or purchase number your agreement requires and the service ordered. Scan the referral into the account so the invoice can cite it. Add the contact who will answer billing questions.
Talk to a billing lead.
A 20-minute call about your payers, volume and setup. Monday to Friday, 9am to 5pm Eastern.