In this guide10 sections
There is no single test that proves complex regional pain syndrome (CRPS). Doctors diagnose it clinically, most often using the Budapest criteria: continuing pain out of proportion to the original injury, symptoms you report in at least three of four categories, signs the doctor observes in at least two of four categories, and no other diagnosis that better explains them. In a California workers’ comp case, how carefully your doctors document each of those elements can decide whether the diagnosis, the treatment and the disability rating hold up.
Key takeaways
- The Budapest criteria require both symptoms you report and signs a doctor observes, across four categories: sensory, vasomotor, sudomotor/edema and motor/trophic.
- Insurers often challenge CRPS because it is a clinical diagnosis, so documentation at every visit matters.
- Treatment requests are judged under the state’s Medical Treatment Utilization Schedule (MTUS) through utilization review and independent medical review.
- If a QME report dismisses your CRPS, you have short deadlines to respond, so act quickly.
The Budapest criteria, explained
The Budapest clinical diagnostic criteria have four parts. All four must be met.
- Continuing pain that is disproportionate to any inciting event.
- Symptoms: you report at least one symptom in three of the four categories below.
- Signs: the doctor observes at least one sign at the exam in two or more of the categories.
- No better explanation: there is no other diagnosis that better explains the signs and symptoms.
| Category | Examples of what counts |
|---|---|
| Sensory | Heightened sensitivity to pain, or pain from light touch, pressure or joint movement (allodynia) |
| Vasomotor | Temperature differences between the limbs, skin color changes or color differences |
| Sudomotor/edema | Swelling, sweating changes or sweating differences between the limbs |
| Motor/trophic | Reduced range of motion, weakness, tremor or dystonia, or changes in hair, nails or skin |
The key point for a workers’ comp claim is the difference between symptoms and signs. Telling your doctor your hand feels hot and swollen is a symptom. The doctor measuring a temperature difference or seeing swelling during the exam is a sign. A diagnosis that rests only on what you report is easier for an insurer to attack.
Why the criteria matter in a California workers’ comp case
CRPS often follows a fracture, crush injury, sprain or surgery, and it can turn a routine claim into one involving years of treatment. Because the diagnosis is clinical, insurers frequently dispute it. The Budapest elements come up at several points:
- Treatment requests. Your treating doctor’s requests for nerve blocks, medications, therapy or a spinal cord stimulator go through utilization review, which must be consistent with the MTUS. If a request is denied, you can generally ask for independent medical review within 30 days. See our guide to the MTUS.
- Medical-legal evaluations. A qualified medical evaluator (QME) or agreed medical evaluator (AME) may be asked whether you have CRPS, whether it was caused by the work injury and how much permanent impairment it causes. The DWC’s QME guide explains how evaluators are chosen.
- Permanent disability rating. Your rating starts with an impairment under the AMA Guides, 5th Edition. A missed or rejected CRPS diagnosis can mean a much lower rating. Our CRPS settlement guide explains how ratings and settlements are valued.
What a thorough CRPS exam documents
Doctors approach exams differently, but a well-documented CRPS evaluation commonly includes:
- Side-by-side comparison of both limbs for color, swelling and skin changes
- Skin temperature measurements on both sides
- Testing for allodynia, such as reaction to a light brush or cold
- Range of motion, grip strength and any tremor or abnormal posture
- Questions about changes in hair growth, nails and sweating
- A review of other possible explanations, such as nerve compression or infection
- Photographs of visible changes
Signs can come and go. A limb may look normal on the day of one exam and discolored the next week. That is why repeat documentation over time, and your own dated photos, can be important.
CRPS types
CRPS is commonly divided into Type I, formerly called reflex sympathetic dystrophy, which occurs without a confirmed nerve injury, and Type II, formerly called causalgia, which follows a confirmed nerve injury. Both are diagnosed with the same clinical criteria.
Common documentation problems
- The doctor writes “possible CRPS” without walking through the criteria.
- Symptoms you described aren’t recorded, so too few categories appear in the chart.
- No signs are recorded because the exam didn’t compare both limbs.
- Records from different visits describe your symptoms inconsistently.
- An evaluator labels the pain psychological or exaggerated without addressing the objective findings.
A hypothetical example
Elena, a hotel housekeeper, fractures her wrist when a laundry cart tips. The fracture heals, but months later her hand is burning, swollen and sensitive to the touch of a sheet. Her primary treating physician notes her complaints but doesn’t examine both hands or measure temperature. The insurer’s utilization review denies a request for a sympathetic nerve block, citing no confirmed CRPS diagnosis.
Elena asks for a referral to a pain specialist, who documents swelling, a measured temperature difference and allodynia in the injured hand, and records her symptoms in all four categories. With that record, the treatment request can be resubmitted or taken to independent medical review, and the diagnosis is far harder to dispute at the QME stage.
What you can do
- Describe symptoms in every category. Tell your doctor about pain, temperature, color, swelling, sweating, stiffness, weakness and hair or nail changes, even if they come and go.
- Keep a symptom log and dated photos. Capture flare-ups showing color or swelling differences between limbs.
- Ask for a specialist. If your doctor isn’t evaluating CRPS, ask about a referral to pain management or neurology; our pain management guide explains how that care is authorized. You may also be able to change treating doctors; see changing your primary treating physician.
- Request copies of reports. Check that each element of the criteria is recorded.
- Respond to bad reports fast. If you disagree with your treating doctor’s findings on issues such as permanent disability, an objection under Labor Code §4062 is generally due within 20 days of receiving the report if you have a lawyer, or 30 days if you don’t. For problems with a QME or AME report, see how to dispute a QME or AME report.
- Don’t settle too early. CRPS can need long-term care, so understand your future medical needs before closing your case.
Frequently asked questions
Is there a test that proves CRPS?
No single test confirms it. Doctors may use tests to rule out other conditions, but the diagnosis rests on clinical criteria such as the Budapest criteria.
What if my symptoms aren’t visible on the day of my QME exam?
Tell the evaluator, and make sure your records include earlier documented signs and dated photos. Signs that fluctuate are common with CRPS.
Can the insurer deny treatment because CRPS isn’t confirmed?
Utilization review can modify or deny treatment requests based on the MTUS and the medical records. You can generally request independent medical review within 30 days of a denial.
Does CRPS qualify for more than 104 weeks of temporary disability?
Generally no. CRPS is not one of the listed conditions that extend temporary disability to 240 weeks, so the usual 104-week limit within five years applies.
Can CRPS develop after a minor injury?
Yes, it can follow injuries that seemed minor, such as a sprain. What matters for your claim is a clear medical link between the work injury and the CRPS.
Talk to a California workers’ comp lawyer
Employees First Labor Law represents workers exclusively, including injured workers with CRPS and other chronic pain conditions. We offer free virtual consultations to review your medical records and claim. Contact us online or call (310) 853-3461.
This article is general information about California law as of 2026, not legal advice for your situation. Reading it does not create an attorney-client relationship.
