Choosing an Authorized Treating Physician in Colorado Workers' Comp

In Colorado workers' comp, your employer or its insurer must give you a list of at least four physicians or four corporate medical providers, and you pick your Authorized Treating Physician (ATP) from that list (C.R.S. § 8-43-404(5)(a)(I)(A)). If the employer offers no doctor at the time of injury, the choice is yours. You also get one change of ATP within 90 days of the injury, as long as you have not reached maximum medical improvement.

How many doctors must a Colorado employer offer, and does the rule change in rural areas?

1. 1. Standard rule: at least four physicians or corporate medical providers, with at least one at a separate location without shared ownership.
2. 2. Four to eight willing providers within 30 miles of the employer: the employer may list just two, at two separate locations where possible.
3. 3. Fewer than four willing providers within 30 miles: the employer may name just one.
4. 4. No doctor offered at the time of injury: you may choose your own physician or chiropractor.

Those 30-mile rules matter here. Plenty of employers in Bayfield, Cortez, and Pagosa Springs have only a handful of occupational clinics nearby. So a worker in La Plata or Montezuma County may see a list of two names, or one, where a Denver worker would see four. About 716,962 Coloradans, 12.2% of the state, live in nonmetro areas where that scarcity is normal, not rare (Rural Health Information Hub, U.S. Census ACS 2024 5-year estimate). The list still has to follow the statute. Any party can ask for a fast hearing on whether it did, if the request is filed within 45 days of the injury notice (C.R.S. § 8-43-404(5)(a)(I)(D)).

Why does the ATP matter so much in a Colorado workers' comp claim?

The ATP's notes steer almost every part of a Colorado claim. That doctor decides what care gets ordered, writes your work limits, gives the opinion on whether the job caused the injury, and later rates any lasting harm. The adjuster reads those notes. So does the judge, if the claim is ever fought. Choosing well at the start is easier than fixing a bad record later.

This is where my two careers meet. As a nurse, I spent decades reading charts and learning which line in a note would matter later. As a lawyer, I watch how much of a workers' comp result traces back to that same note. Some are written in thirty seconds between patients. Others are careful and complete. The doctor you end up with shapes which kind you get.

What should I look for when I pick from the employer's list?

• • Real experience with job injuries, not just general family care.
• • Notes that describe your symptoms and limits in plain, specific terms.
• • A doctor who explains the reason behind a return-to-work date or a finding on cause.
• • A clinic you can reach for follow-up when new symptoms show up.
• • Ownership you understand. A listed provider must disclose ownership and job ties within five days if a party asks.

How do I change my Authorized Treating Physician in Colorado?

You can change your ATP once without anyone's permission, if you follow the rules in C.R.S. § 8-43-404(5)(a)(III). The notice must be in writing on the Division of Workers' Compensation form, sent within 90 days of the injury and before you reach maximum medical improvement. It goes to the insurer (or the self-insured employer) and to your first ATP. The new doctor must be on the employer's list. That same form also authorizes your first doctor to send your records to the new one.

Past that one change, you can ask in writing to see a personal physician or chiropractor. The request also goes on a Division form. If the insurer neither grants nor refuses it within 20 days, it is treated as having waived any objection (C.R.S. § 8-43-404(5)(a)(VI)(A)). One detail catches people: until the new doctor says otherwise, the first ATP's work restrictions still control.

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The 90-day change is the one people forget until it's gone. If your first visit felt rushed, or the doctor wrote “full duty” when you can't lift your kid, use the change while you still have it. After day 90, getting a new doctor means asking permission.

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What if I disagree with my ATP's findings?

Disagreeing with an ATP's rating or finding opens a formal process, not an argument by phone. The main tool is a Division Independent Medical Exam, or DIME, under C.R.S. § 8-42-107.2. A party who disputes the ATP's findings must request one on a Division form. For a worker, the clock usually starts when the insurer mails a final admission with an impairment rating, and the request is generally due within 30 days. Miss that window and the rating tends to stick.

What should I tell my ATP at every visit?

You shape the record, even if you had no say in the doctor. Write your symptoms down before each visit so you don't forget under time pressure. Be exact. “I can't lift more than 10 pounds without shooting pain down my left arm” records far better than “my shoulder still hurts.” Name every symptom, even small ones. A symptom left out today is much harder to tie to the injury later.

If your claim is ever denied or fought, your ATP's records become the core evidence. Our guide to what happens after a denial shows how that record is used at a hearing. If you are still sorting out who runs your claim day to day, our overview of Southwest Colorado workers' comp claims breaks down each layer. And our medical care benefits page covers the treatment you are owed once your ATP is in place.