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CODESCAN: Stata module to scan wide-format code variables for pattern matches

Author

Listed:
  • Timothy P Copeland

    (Karolinska Institutet)

Programming Language

Abstract

codescan scans wide-format code variables, such as dx1-dx30 or proc1-proc20 in registry and claims data, for pattern matches using regular expressions or prefix matching, with rules given inline or read from a reusable CSV or Stata code dictionary. It creates binary indicators or per-row counts for each defined condition, supports exclusion patterns, applies lookback and lookforward time windows around a reference date, reports prevalence, and can collapse to patient-level summaries or merge them back onto the rows. Results are returned in r() and can be placed in a named frame, saved as a dataset, or exported to CSV or Excel. Diagnostics include per-variable contributions, pairwise co-occurrence, and multi-window sensitivity with denominators. The companion command codescan_describe inventories the code values in the same variables before any rules are written and can draft a starter codefile. It works with ICD, KVA, CPT, ATC, OPCS, or any string code system.

Suggested Citation

  • Timothy P Copeland, 2026. "CODESCAN: Stata module to scan wide-format code variables for pattern matches," Statistical Software Components S459958, Boston College Department of Economics.
    • Handle: RePEc:boc:bocode:s459958
    Note: This module should be installed from within Stata by typing "ssc install codescan". The module is made available under terms of the MIT license (https://opensource.org/licenses/MIT).
    as

    Download full text from publisher

    File URL: http://fmwww.bc.edu/repec/bocode/c/codescan.ado
    File Function: program code
    Download Restriction: no
    File URL: http://fmwww.bc.edu/repec/bocode/_/_codescan_engine.ado
    File Function: program code
    Download Restriction: no
    File URL: http://fmwww.bc.edu/repec/bocode/_/_codescan_codefile.ado
    File Function: program code
    Download Restriction: no
    File URL: http://fmwww.bc.edu/repec/bocode/_/_codescan_definitions.ado
    File Function: program code
    Download Restriction: no
    File URL: http://fmwww.bc.edu/repec/bocode/_/_codescan_outputs.ado
    File Function: program code
    Download Restriction: no
    File URL: http://fmwww.bc.edu/repec/bocode/_/_codescan_parse_filespec.ado
    File Function: program code
    Download Restriction: no
    File URL: http://fmwww.bc.edu/repec/bocode/_/_codescan_validate_path.ado
    File Function: program code
    Download Restriction: no
    File URL: http://fmwww.bc.edu/repec/bocode/_/_codescan_tostring.ado
    File Function: program code
    Download Restriction: no
    File URL: http://fmwww.bc.edu/repec/bocode/c/codescan.sthlp
    File Function: help file
    Download Restriction: no
    File URL: http://fmwww.bc.edu/repec/bocode/c/codescan_describe.ado
    File Function: program code
    Download Restriction: no
    File URL: http://fmwww.bc.edu/repec/bocode/c/codescan_describe.sthlp
    File Function: help file
    Download Restriction: no
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