Erythropoiesis = formation of erythrocytes. 1  the body must produce about 2.5 million new RBCs every second. 2  in adults, erythropoiesis occurs mainly in the marrow of the sternum, ribs, vertebral processes, and skull bones. 3  begins with a cell called a hemocytoblast or stem cell (below)  rate is regulated by oxygen levels:
1 Second Intention Healing â A wound that is extensive and involves considerable tissue loss, and in which the edges cannot be brought together heals in this manner. 2  This is how pressure ulcers heal. 3  Secondary intention healing differs from primary intention healing in three ways:
Use 1500x series for primary intention. Note that you should use the 1500x codes only for cases where the provider plans to heal the wound by primary intention, CPT states. What that means: Primary intention is a wound-care method used for acute injuries that closes the wound with stitches or graft, for example. In contrast, secondary intention, used for chronic wounds such as diabetic or venous ulcers, promotes healing from the inside out.