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Classification and Coding Systems. Overview. Why doctors are using coding systems? What is a coding system? Short introduction of: ICD-9 and ICD-9 CM ICD-10 ICPC SNOMED International. Why Coding Systems? (1). Elements of Coding Systems:

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overview
Overview
  • Why doctors are using coding systems?
  • What is a coding system?
  • Short introduction of:
    • ICD-9 and ICD-9 CM
    • ICD-10
    • ICPC
    • SNOMED International
why coding systems 1
Why Coding Systems? (1)
  • Elements of Coding Systems:
    • controlled vocabularies to avoid syntactical variations
    • concept systems to porvide semantic relations
    • codes reflecting the hierarchy of concept systems

Everythig to avoid problems with free-text data

why coding systems 2
Why Coding Systems? (2)
  • Problems with free-text data elements:
    • Retriving cases lexical variants, synonyms, no hierarchy
    • Grouping cases for counting and averaging
    • Assuring data quality
    • Using data as input to further processing
classifications
Classifications
  • Concepts are called „classes”;the concept’s preferred term is the class name
  • Facts are fitted into a category, or classified (and then: encoded)
  • Classes are complete and pair-wise disjunctive
  • Preferred use: counting and averaging
nomenclatures
Nomenclatures
  • Preferred term is called a „descriptor”
  • Facts are labelled or „indexed”
  • Descriptors have to cover all relevant aspects
  • Preffered use: retriving cases and processing data
icpc international classification for primary care 1
ICPC - International Classification for Primary care (1)
  • A manageable coding systems to enable
    • population based health studies
    • systematic analysis of the care process
  • A three-dimensional, non-hierarchic classification:
    • reason for encounter
    • diagnosis or problem
    • care process
  • 17 chapters for the body systems with identical structure
icpc international classification for primary care 2
Alphanumerical codes: three digits

ICPC sample notation:

60 y/o male patien presents with vomiting and abdominal pain. He also complains of pain in both knees, his left wrist and some visible swelling, for which he seeks attention.

ICPC - International Classification for Primary care (2)
icpc applications and limitations
ICPC: Applications and Limitations
  • Made to analyse the care process in general and family medicine
  • Takes into account the patient’s motivation
  • Is very systematic and simple
  • Level of detail suffices only for very general analyses
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