The major differences between ICD-10PCS and ICD-9 codes are...

a. In ICD-10PCS procedures were assigned to only one code and in ICD-10 they are not

b. In ICD-10PCS the process for constructing procedure codes is much more logical and consistent

c. In ICD-9 procedures could be 3 to 4 characters long with a decimal point placed after the second digit, but in ICD-10, they are always 7 characters long

d. all of the above

e. b & c are correct