Code year: FY2026 (Oct 1 2025 Sep 30 2026) Audience: Certified Coders, Auditors and Clinical Documentation Specialists Access: CCO Members Last updated: April 2026 Definition Deep vein thrombosis (DVT) is the formation of a blood clot (thrombus) within a deep vein, most commonly in the lower extremities the femoral, popliteal, iliac, tibial, or peroneal veins but also occurring in the upper extremities (brachial, radial, ulnar, axillary, subclavian, internal jugular veins) and less commonly in other sites (vena cava, renal vein, hepatic vein, cerebral sinuses)
[8] Absolute contraindications include prior hypersensitivity to cyanocobalamin, cobalt, or formulation excipients
[2] Hydroxocobalamin is administered via intramuscular or intravenous injection to treat and prevent vitamin B deficiency, particularly in conditions like pernicious anemia where oral B absorption is impaired
Recordkeeping: Log the daily dose, injection site and any observations to keep the protocol consistent