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Handout on 2/11/2010. ICD 9 coding definitions.


grouping together of similar items


classifying data and assigning a representation for

purpose of coding

confidentiality, communicate differently, statistics


international classification of diseases 9th revision, clinical modification

volume I

tabular list of diseases

volume I subdivisions

classification of diseases and injuries, supplementary classifications(V & E codes), appendices

V codes

used to diagnose when there is no problem or condition (the letter v followed by a 2 numeric digits)

E codes

used to diagnose the environment of injury (the letter e followed by 3 numeric digits, a decimal, and a fourth digit

volume I chapters

17 chapters that classify conditions according to etiology or by specific anatomical system)


cause or reason for


the tissue or body system or organ involved where cancer is prevelant

volume I structure

sections, categories, subcategories

5th digit classifications

provide even greater specificity

residual subcategories

these are codes with titles "other" and "unspecified"

supplementary classifications are

v & e codes

volume II

alphabetical index of diseases

volume II sections

index to diseases and injuries, table of drugs and chemicals, alphabetic index to external causes of injury and poisoning

volume II index

includes terminology for all codes, 3 levels of index include main term, sub-term, carryover lines

nonessential modifiers

series of terms in parenthesis that sometimes directly follow main terms as well as subterms. the presemce or absence of terms in the diagnosis has no effect on the selection of the code listed for that main term or subterm

volume III

tabular listing and alphabetical index of procedures


cross reference terms that are directions to look elsewhere before assigning a code


name of something named after the person who discovered it, etc.

instructional notations

clarify information or provide additional information


systematic listing of proper names


instruction to assign a 5th digit, additional coding instructions, define terms, appear in all 3 volumes

how many index tables ate there in the alphabetical index


what are the 2 tables in the alphabetic index

hypertension & neoplasm

how do notes appear in the alphabetic list

boxed, set italic type

how do how do notes appear in the tabular list

located various levels and are not boxed

what is multiple coding

situation where more than one code is needed to describe the condition

what are two types of multiple coding

mandatory and indiscriminate

in mandatory coding, what are multiple codes used for

one code describes the underlying condition, the other identifies the manifestations

in alphabetic index where is the second code listed for mandatory coding

in brackets

indiscriminate multiple coding

irrelevant medical information such as signs and symptoms

if additional code appears at beginning of a chapter

it affects entire chapter

connecting words

sub-terms that indicate a relation ship between the main terms and an associated condition or etiology in alphabetic index


abbreviation for not elsewhere classified


abbreviation for not otherwise specified

sechon mark (this term is incorrectly listed, it should read section mark)

indicates presence of footnotes that lead to a fifth digit


used for research purposes only(used mostly in the US it is disregarded by the coder as being irrelevant)


enclose supplementary words or explanatory information that may or may not be present in the statement of a diagnosis or procedure

square brackets

used to enclose synonyms. alternative wording, abbreviations and explanatory phrases

slanted brackets

found only on alphabetic index, enclose a code number one or more modifiers in order to assign a given category or code


used in tabular list after an incomplete term that needs one or more modifiers in order to assign a given category or code


simplifies tabular list entries and saves printing space by reducing repetitive wording


resulting condition

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