AAPC CPC Study Guide 2013 Chapter 3
Intro To ICD-9
WHO -
✔World Health Organization
NCHS -
✔National Centers for Health Statistics
Federal Register -
✔NCHS and CMS final decisions are made and published effective October of
each year
ICD-9-CM, Volume 1 -
✔Tabular List: Diagnosis codes organized in order of code
ICD-9 CM, Volume 2 -
✔Index to disease or alphabetic:diagnostic terms organized in an alphabetic
order for the disease descriptions for Vol 1
ICD-9CM, Volume 3 -
✔Alphabetic index and tabular list of procedures: procedures performed in the
inpatient setting
NEC -
✔Not elsewhere classifiable
The provider documented more specific information regarding the patient's condition
but there's not a code in the ICD-9 that reports the condition accurately -
✔NEC
NOS -
✔Not otherwise specified
This abbreviation is the equivalent of "unspecified" and is only used when a coder
lacks information necessary to code to a more specific fourth or fifth digit
subcategory -
✔NOS
[ ] -
✔Used to enclose synonyms, alternate wording or explanatory phrases
slanted brackets -
✔Used to indicate multiple codes are required
( ) -
✔Used to enclose supplementary words that may be present or absent in the
statement of the disease or procedure without affecting the code number to which it
is assigned
: -
✔Using volume 1 after an incomplete term requiring one or more of the
descriptions that follow to make it assignable to a given category
