CK / CPK (Creatine Kinase) (CPT 82550)
Medicare Rate vs. Lab Charges
Medicare pays $8.34 for this test. Labs commonly charge $30.00–$110.00. That's a 260%–1219% markup above what Medicare pays.
What This Test Is
Creatine kinase (CK or CPK) is an enzyme found in muscle and heart. Elevated CK indicates muscle damage, heart attack, myositis, or statin side effects. It's ordered when evaluating chest pain, muscle weakness, or to monitor statin therapy.
Medicare Rate vs. Lab Charges
| Medicare Allowable Rate | $8.34 |
| Typical Lab Charge Range | $30.00–$110.00 |
| Average Markup Above Medicare | 260%–1219% |
Does Medicare Cover This Test?
Yes, Medicare Part B covers CK testing when ordered to evaluate chest pain, muscle symptoms, or to monitor medications that can affect muscles.
Common Reasons for Denial
- Routine screening in asymptomatic patients
- Tested too frequently without medication change or symptom worsening
- No diagnosis code documenting reason (chest pain, muscle weakness)
- Duplicate test within short timeframe
- Routine statin monitoring without documented muscle symptoms
What To Do If You're Overcharged
If you received a lab bill that seems unusually high compared to Medicare rates:
- Check your Explanation of Benefits (EOB) from Medicare or your insurance to see what should have been paid.
- Request an itemized bill from the lab showing all charges.
- Compare to GougeStop rates for your area to see if the charge is reasonable.
- Contact the lab's billing department to dispute erroneous charges or negotiate a lower rate.
- File an appeal with Medicare if a claim was incorrectly denied.
Frequently Asked Questions
A: Statins can cause muscle pain and damage (myopathy). If you have muscle symptoms, baseline and periodic CK testing helps monitor for statin-related injury.
A: Normal is roughly 30-200 U/L (varies by lab). Markedly elevated (>1,000) suggests significant muscle damage. Your doctor interprets results in context.
A: Usually, but troponin is more specific for heart attacks. CK can be elevated by strenuous exercise, muscle injury, or muscle diseases.