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CPT 82550: Total Creatine Kinase (CK/CPK) Assay
CPT code 82550 represents a laboratory assay measuring total creatine kinase (CK/CPK) in patient specimens. This routine clinical chemistry test is used nationally to assist in the evaluation of muscle injury, myocardial damage, and metabolic or neuromuscular disorders. Total CK testing remains relevant in emergency, inpatient, and outpatient diagnostic pathways where enzyme elevation informs clinical decision-making.
Key payers covered in this analysis include Aetna, Blue Cross Blue Shield, Cigna Health, United Healthcare, and Medicare. Readers will find a concise overview of the clinical context for CPT code 82550, common sites of service where the test is performed, typical diagnostic scenarios associated with the test, and connections to related laboratory coding (for example, isoenzyme testing represented by related codes). The publication also summarizes payer coverage scope and common billing modifiers used with laboratory services when available.
This summary is intended to provide clinicians, laboratory managers, and billing professionals with a clear reference to the clinical purpose of CPT code 82550 and the operational contexts in which it is billed, helping align coding with clinical documentation and payer communications.
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Billing Code Overview
CPT code 82550 describes a laboratory test measuring total creatine kinase (CK or CPK) in a patient specimen. Creatine kinase is an enzyme present in muscle, brain, and cardiac tissue; quantifying total CK aids in evaluating muscle injury, myocardial damage, and other conditions that alter serum enzyme levels.
Service Type: Laboratory test — clinical chemistry
Typical Site of Service: Clinical laboratory, hospital laboratory, or outpatient laboratory collection site
National Reimbursement Benchmarks
The national commercial landscape for CPT 82550 centers on a BUCA average commercial rate of $16.6, with individual payers clustered at different levels. Blue Cross Blue Shield averages higher ($23.8) with wider variability, while Aetna ($7.8), Cigna ($7.3), and UnitedHealth Group ($5.8) report lower means. BUCA provides a mid-market anchor between the lower-mean payers and Blue Cross Blue Shield.
Dispersion (P75 minus P25) highlights contract variability: Blue Cross Blue Shield has the widest interquartile spread at $8.1 ($27.9 - $19.8), indicating greater rate dispersion, while UnitedHealth Group is the tightest at $3.6 ($6.5 - $2.9). Aetna and Cigna show moderate spreads of $4.3 ($8.6 - $4.3) and $5.1 ($9.4 - $4.3), respectively, signaling more limited but meaningful within-payer variation.