Medical coders must assign and input the correct diagnostic code to establish the amount of money a health care provider or facility gets reimbursed from the insurer. In order to maintain consistency, they must utilize standard classification systems, like ICD-9-CM/CPT/HCPCS/DRG/APC.
Sometimes a small amount of spotting or vaginal bleeding is one of the first symptoms of pregnancy. Known as implantation bleeding, it happens when the fertilised egg attaches to the lining of the uterus â about 10 to 14 days after fertilization.
A fertilized egg is a zygote for about 3 days. Then it becomes a morula; a couple of days later, it is a blastocyst. After about 2 weeks (from conception), it is an embryo.At 10 weeks, it is a fetus. Source(s): http://health.allrefer.com/health/fetal-...http://www.religioustolerance.org/abo_fe...t is then when the mass of cells divide into the three derms, or layers, of cells: the endoderm (inner), the mesoderm (middle), and the ectoderm (outer). When the three derms have distinctly formed. The embryo does not become a fetus until after the end of the embryonic period some six weeks later.