Classification and coding systems
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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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Classification and Coding Systems

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Classification and coding systems

Classification andCoding Systems


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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