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Lost-Time vs. Medical-Only Claims: Why Return-to-Work Timing Matters on a Workers' Comp Account

10/9/2026

Two workers on the same crew cut their hands on the same day. One gets stitches, goes back to the job the next morning and never misses a shift. The other gets stitches, is told to keep the hand dry and avoid gripping for two weeks, and stays home because the employer "doesn't have anything light." Same injury, same medical bill, very different claims. The first is medical-only. The second is a lost-time claim, with indemnity payments, more adjuster involvement, and a bigger footprint on the employer's loss runs and, eventually, the experience mod.

For commercial lines agents and account managers, that difference is one of the most useful things to explain to a client, because it is one of the few claim-cost drivers the employer can influence after an injury happens. This article explains the distinction, how indemnity benefits start, why lost-time claims weigh more in experience rating, and where return to work fits, without promising any particular result for any particular account.

Medical-Only vs. Lost-Time Claims: The Basic Difference

Workers' compensation pays two broad kinds of benefits: medical benefits (treatment, prescriptions, therapy, related costs) and indemnity benefits (partial replacement of wages lost because of the injury, plus benefits for permanent impairment or death).

  • A medical-only claim is one where the injured worker received medical care but no indemnity, typically because they did not miss enough time to qualify for wage-loss benefits.
  • A lost-time claim (sometimes called an indemnity claim) is one where the worker was paid indemnity, usually because the injury kept them off work, or working at reduced earnings, beyond the state's waiting period.

On NCCI's unit statistical reports and experience rating worksheets, each claim carries an injury-type code. Medical-only claims are injury type 6; the other types cover death, permanent total, permanent partial and temporary total disability. When you read a worksheet or a carrier loss run, the injury type tells you which bucket a claim fell into.

The distinction matters to the client for three reasons: lost-time claims cost more on average, they stay open longer, and in most NCCI states the rating plan treats medical-only claims more lightly.

How Waiting Periods and Indemnity Benefits Work in General

Every state sets its own benefit rules, so treat the following as the general pattern and send the client to the state workers' compensation agency for specifics.

The waiting period

Most states do not pay wage-loss benefits for the first few days of disability. That waiting period is set by statute and varies by state. If the disability continues past a longer period, also set by statute, most states then pay the waiting-period days retroactively. Medical benefits are generally not subject to the waiting period; treatment is covered from the first visit.

That structure is why a short absence often stays medical-only. A worker who misses one or two shifts may never cross into indemnity. A worker who is off for weeks will.

Temporary total and temporary partial disability

Once the waiting period is met, the most common indemnity benefit is temporary total disability (TTD): a percentage of the worker's average weekly wage, subject to a state maximum and minimum, paid while the worker cannot work at all during recovery. The percentage, the caps and how the average weekly wage is figured are all state rules.

If the worker can return to work at reduced hours or reduced pay, many states pay temporary partial disability (TPD), a benefit based on the difference between pre-injury and current earnings. This is the mechanism that makes modified duty financially meaningful: a worker earning most of their wage on light duty draws far less indemnity than one sitting at home on TTD.

When temporary benefits end

Temporary benefits generally stop when the worker returns to full earnings, reaches maximum medical improvement, or hits a statutory duration limit. At that point any permanent impairment is rated and paid under the state's permanent disability rules. Those determinations are medical and legal questions for the adjuster, the treating physician and, where disputed, the state's system.

Tax treatment

Workers' comp benefits paid under a workers' compensation act are excluded from the employee's gross income under Internal Revenue Code section 104(a)(1). If an employer chooses to pay more than the statutory benefit to "top up" an injured worker's pay, that extra amount is taxable wages. Clients sometimes do this informally; it is worth making sure their payroll provider handles it correctly.

Why Lost-Time Claims Weigh More in Experience Rating

The experience mod compares an employer's actual losses with expected losses for its payroll and class codes. Two features of NCCI's plan make lost-time claims count more than medical-only ones.

  1. Lost-time claims are bigger. Indemnity is often a large share of a claim's total cost, and lost-time claims also tend to involve more treatment, more adjuster time and longer duration. A larger claim fills more of the primary loss layer, which the mod counts at full weight, and spills into the excess layer.
  2. Medical-only claims are discounted in most NCCI states. Most NCCI states have approved the Experience Rating Adjustment (ERA). Under ERA, the mod includes only 30% of the primary and excess portions of each medical-only claim, which NCCI describes as a 70% reduction. Lost-time claims are not reduced this way. NCCI's stated purpose for ERA is to reduce the incentive for employers to pay small medical claims themselves instead of reporting them.

Put those together and a claim that turns from medical-only into lost-time does two things at once: it gets more expensive, and it loses the ERA discount. On a small account with few claims, that conversion can be one of the most visible things on the next worksheet that includes that policy year.

Keep two cautions in mind when explaining this:

  • ERA is a state-approved feature. Confirm it applies in the client's state and on the client's worksheet, and remember that states with independent rating bureaus (for example California, Pennsylvania and New York) run their own experience rating rules.
  • Timing lag. Under NCCI's plan, the experience period generally covers three policy years ending about a year before the rating effective date, so a claim's effect shows up on a later mod, not the next one. Do not tell a client that a quick return to work will lower next year's mod; describe how the formula treats the claim and leave the forecast out.

For a deeper explanation of the rating formula, see ABTC's workers' compensation training.

Where Modified Duty Fits Between Injury and Full Release

Most injuries do not go straight from "can't work" to "fully released." There is usually a stretch where the treating provider says the worker can do something, with restrictions: no lifting over a certain weight, limited standing, one hand only, no ladders. What the employer does with that stretch largely decides whether the claim stays small.

If the employer has transitional or modified duty that fits the restrictions, the worker can keep earning, stay connected to the crew and supervisor, and recover in a structured setting. If not, the worker sits at home on TTD until full release, and the claim keeps growing.

A well-run return-to-work process generally includes:

  • A written policy that says the employer will look for modified work for injured employees within their restrictions.
  • Prompt communication with the treating provider about available tasks, often using a job description or a list of modified tasks.
  • Written offers of modified duty that state the tasks, hours, pay and restrictions, with copies to the adjuster.
  • A time limit and review points, so modified duty is a bridge back to the regular job rather than a permanent new role.
  • Coordination with leave and disability law. Modified duty does not override the Family and Medical Leave Act or the Americans with Disabilities Act. Under the FMLA regulations, an employee on FMLA leave may decline a light-duty offer and keep FMLA job-restoration rights, but may lose workers' comp wage benefits as a result (29 CFR 825.220(d) and 825.702(d)(2)). The ADA's interactive process and reasonable accommodation duties can also apply.

That last point is why return-to-work is an HR process, not only a claims process, and why it belongs in a client conversation with the right people at the table. ABTC's article on return-to-work programs covers program design in more detail.

Reading Loss Runs for Lost-Time Patterns

When you review a client's loss runs at renewal or mid-term, look beyond the total incurred.

Ratio of lost-time to medical-only claims. Count both by policy year. An account where a high share of claims become lost-time is telling you something about how injuries are handled after they happen.

Days or weeks of indemnity on smaller injuries. Sprains, strains and lacerations with several weeks of TTD are worth a question. Was modified duty offered? Did the employer hear from the provider? Was there a delay reporting the claim?

Lag from injury to report. Late reporting delays the adjuster's ability to coordinate care and return to work. If the client is reporting injuries days or weeks late, that is a process issue.

Open claims with large indemnity reserves. These are the claims that will drive the mod. Find out what the plan is for each one and who at the client is in contact with the adjuster.

Repeat injuries by location, crew or job. Patterns point to safety and supervision issues rather than return-to-work issues.

Medical-only claims that converted. Some loss runs show a claim's injury type changing over time. A claim that began medical-only and became lost-time is worth understanding.

Keep your observations factual and specific to the data. For a refresher on how claims move from report to closure, see our article on the workers' compensation claims process.

What to Discuss With the Client and What to Leave to the Adjuster

Agents are well placed to raise process questions. Agents are not well placed to manage individual claims, give medical opinions or interpret the client's employment-law obligations.

Good topics for the agent:

  • How and how fast the client reports injuries to the carrier
  • Whether the client has a written return-to-work policy and who runs it
  • Whether supervisors know what to do when a worker comes back with restrictions
  • Which loss-control or return-to-work resources the carrier offers
  • How the experience mod treats medical-only and lost-time claims, in general terms
  • Whether payroll and class codes on the worksheet are right

Leave to the adjuster, the carrier or counsel:

  • Whether a specific claim is compensable
  • Benefit amounts, rates and durations on a specific claim
  • Medical treatment decisions and disputes
  • Whether a specific modified-duty offer satisfies state law
  • Discipline or termination of an injured worker
  • ADA accommodation decisions and FMLA designation

When you do raise return to work, tie it to how the client runs its business, not to a promised premium result. "Here is how the rating plan counts these claims, and here is what a return-to-work process looks like" is accurate. "If you do this, your mod will drop" is not something you can know. For background on what the policy pays, see what workers' comp insurance covers.

Help the Client's Team Handle the Steps That Matter

The people who decide whether an injury stays medical-only are usually the client's HR, safety and operations staff, not the agent. The Workers' Compensation Training & Certification program covers injury reporting, communicating with employees and insurance representatives, the claims process, medical restrictions and return to work, and how premiums are determined. It is self-paced, online, with an optional exam for the Certified Workers' Compensation Administrator designation. It is professional training, not state insurance CE, and it can be a useful resource to point clients toward.

Frequently Asked Questions

What is the difference between a lost-time and a medical-only workers' comp claim?

A medical-only claim pays for treatment but no wage-loss (indemnity) benefits, usually because the worker missed little or no time. A lost-time claim includes indemnity, typically because the worker was off work or earning less beyond the state's waiting period. On NCCI unit reports and experience rating worksheets, medical-only claims are injury type 6. Lost-time claims tend to cost more, stay open longer and, in most NCCI states, count more heavily in the experience mod.

How long is the waiting period before workers' comp pays lost wages?

It depends on the state. Each state sets a waiting period of several days before wage-loss benefits begin, and most pay those days retroactively if the disability lasts beyond a longer statutory period. Medical benefits generally are not subject to the waiting period. Check the state workers' compensation agency or statute for the exact number of days and the retroactive trigger, and remember the carrier's adjuster applies these rules on each claim.

Do medical-only claims count against the experience mod?

They count, but in most NCCI states they count less. Under the Experience Rating Adjustment, only 30% of a medical-only claim's primary and excess amounts enter the mod calculation, a 70% reduction. Lost-time claims are not reduced. ERA is approved state by state, and independent bureau states have their own rules, so confirm it applies on the client's worksheet before explaining it.

Does modified duty reduce workers' comp costs?

Modified duty lets an injured worker keep earning within medical restrictions, which generally means less temporary total disability paid on the claim and a more direct path back to the regular job. Whether it changes a specific claim's cost, or a future mod, depends on the injury, the state's benefit rules and the rest of the employer's experience. Describe the mechanism to clients; do not promise a particular premium or mod result.

Can an employee refuse light duty?

It depends on the laws involved. Under the FMLA regulations, an employee on FMLA leave may decline a light-duty offer and keep FMLA job-restoration rights, though they may lose workers' comp wage benefits under state law (29 CFR 825.220(d) and 825.702(d)(2)). State workers' comp rules on refusing suitable work vary. The ADA may also apply. These are questions for the adjuster and employment counsel, not the agent.

Should an agent get involved in a client's open claims?

Agents can help with process: making sure injuries are reported promptly, connecting the client with the carrier's claim and loss-control staff, and reviewing loss runs for patterns. Compensability, benefit amounts, medical treatment and employment decisions belong to the adjuster, the treating provider and the client's counsel. Keep notes of what you discussed and referred, and avoid giving opinions on individual claim outcomes.

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