| | Healthcare Industry | Medical Billing What is medical billing code 81001? 81001 is the medical CPT code for "arthrocentesis, aspiration and or injection; small joint or bursa (eg, finger, toe, ankle, wrist, elbow)". Medical Billing - Related Articles How does hepatitis start? Core Symptoms of ADHD Dangers of Weight Gain After Gastric Bypass Surgery How to Reduce Uric Acid Naturally Vitamins for Skin Tightening Foot Patch - Overnight Detox Plasmablastic Lymphoma of the Liver