Stata 15 help for icd10cm

[D] icd10cm -- ICD-10-CM diagnosis codes

Syntax

Verify that variable contains defined codes

icd10cm check varname [if] [in] [, checkopts]

Clean variable and verify format of codes

icd10cm clean varname [if] [in], {generate(newvar) | replace} [cleanopts]

Generate new variable from existing variable

icd10cm generate newvar = varname [if] [in], category [check]

icd10cm generate newvar = varname [if] [in], description [genopts]

icd10cm generate newvar = varname [if] [in], range(codelist) [check]

Display code descriptions

icd10cm lookup codelist [, version(#)]

Search for codes from descriptions

icd10cm search ["]text["] [["]text["] ...] [, searchopts]

Display ICD-10-CM version

icd10cm query

codelist is one of the following:

icd10code (the particular code) icd10code* (all codes starting with) icd10code/icd10code (the code range)

or any combination of the above, such as A27.0 G40* Y60/Y69.9.

checkopts Description ------------------------------------------------------------------------- fmtonly check only format of the codes summary frequency of each invalid or undefined code list list observations with invalid or undefined ICD-10-CM codes generate(newvar) create new variable marking invalid codes version(#) fiscal year to check codes against; default is version(2019) -------------------------------------------------------------------------

cleanopts Description ------------------------------------------------------------------------- * generate(newvar) create new variable containing cleaned codes * replace replace existing codes with the cleaned codes check check that variable contains ICD-10-CM codes before cleaning nodots format codes without a period pad add space to the right of codes shorter than seven characters ------------------------------------------------------------------------- * Either generate() or replace is required.

genopts Description ------------------------------------------------------------------------- addcode(begin|end) add code to the beginning or end of the description pad add spaces to the right of the code; must specify addcode(begin) nodots format codes without a period; must specify addcode() check check that variable contains ICD-10-CM codes before generating new variable long use long description rather than short version(#) select description from year #; default is version(2019) -------------------------------------------------------------------------

searchopts Description ------------------------------------------------------------------------- or match any keyword matchcase match case of keywords version(#) select description from year #; default is all -------------------------------------------------------------------------

Menu

Data > ICD codes > ICD-10-CM

Description

icd10cm is a suite of commands for working with ICD-10-CM diagnosis codes from U.S. federal fiscal year 2016 to the present. To see the current version of the ICD-10-CM diagnosis codes and any changes that have been applied, type icd10cm query.

icd10cm check, icd10cm clean, and icd10cm generate are data management commands. icd10cm check verifies that a variable contains defined ICD-10-CM diagnosis codes and provides a summary of any problems encountered. icd10cm clean standardizes the format of the codes. icd10cm generate can create a binary indicator variable for whether the code is in a specified set of codes, a variable containing a corresponding higher-level code, or a variable containing the description of the code.

icd10cm lookup and icd10cm search are interactive utilities. icd10cm lookup displays descriptions of the codes specified on the command line. icd10cm search looks for relevant ICD-10-CM diagnosis codes from keywords given on the command line.

Options

Options are presented under the following headings:

Options for icd10cm check Options for icd10cm clean Options for icd10cm generate Option for icd10cm lookup Options for icd10cm search

Options for icd10cm check

fmtonly tells icd10cm check to verify that the codes fit the format of ICD-10-CM diagnosis codes but not to check whether the codes are defined.

summary specifies that icd10cm check should report the frequency of each invalid or undefined code that was found in the data. Codes are displayed in descending order by frequency. summary may not be combined with list.

list specifies that icd10cm check list the observation number, the invalid or undefined ICD-10-CM diagnosis code, and the reason the code is invalid or whether it is an undefined code. list may not be combined with summary.

generate(newvar) specifies that icd10cm check create a new variable containing, for each observation, 0 if the observation contains a defined code. Otherwise, it contains a number from 1 to 11 if the code is invalid, 77 if the code is valid only for a previous version, 88 if the code is valid only for a later version, 99 if the code is undefined, or missing if varname is missing. The positive numbers indicate the kind of problem and correspond to the listing produced by icd10cm check.

version(#) specifies the version of the codes that icd10cm check should reference. # indicates the federal fiscal year for the codes. For example, use 2016 for federal fiscal year 2016 (FFY-2016), which is October 1, 2015 to September 30, 2016. icd10cm supports all years after the United States officially adopted ICD-10-CM. The appropriate value of # should be determined from the data source. The default is version(2019).

Warning: The default value of version() will change over time so that the most recent codes are used. Using the default value rather than specifying a specific version may change results after a new version of the codes is introduced.

Options for icd10cm clean

generate(newvar) and replace specify how the formatted values of varname are to be handled. You must specify either generate() or replace.

generate() specifies that the cleaned values be placed in the new variable specified in newvar.

replace specifies that the existing values of varname be replaced with the formatted values.

check specifies that icd10cm clean should first check that varname contains codes that fit the format of ICD-10-CM diagnosis codes. Specifying the check option will slow down icd10cm clean.

nodots specifies that the period be removed in the final format.

pad specifies that spaces be added to the end of the codes to make the (implied) dots align vertically in listings. The default is to left-align codes without adding spaces.

Options for icd10cm generate

category, description, and range(codelist) specify the contents of the new variable that icd10cm generate is to create. You do not need to icd10cm clean varname before using icd10cm generate; it will accept any supported format or combination of formats.

category specifies to extract the three-character category code from the ICD-10-CM diagnosis code. The resulting variable may be used with the other icd10cm subcommands.

description creates newvar containing descriptions of the ICD-10-CM diagnosis codes.

range(codelist) creates a new indicator variable equal to 1 when the ICD-10-CM diagnosis code is in the range specified, equal to 0 when the ICD-10-CM diagnosis code is not in the range, and equal to missing when varname is missing.

addcode(begin|end) specifies that the code should be included with the text describing the code. Specifying addcode(begin) will prepend the code to the text. Specifying addcode(end) will append the code to the text.

pad specifies that the code that is to be added to the description should be padded spaces to the right of the code so that the start of description text is aligned for all codes. pad may be specified only with addcode(begin).

nodots specifies that the code that is added to the description should be formatted without a period. nodots may be specified only if addcode() is also specified.

check specifies that icd10cm generate should first check that varname contains codes that fit the format of ICD-10-CM diagnosis codes. Specifying the check option will slow down the generate subcommand.

long specifies that the long description of the code be used rather than the short (abbreviated) description.

version(#) specifies the version of the codes that icd10cm generate should reference. # indicates the federal fiscal year for the codes. For example, use 2016 for federal fiscal year 2016 (FFY-2016), which is October 1, 2015 to September 30, 2016. icd10cm supports all years after the United States officially adopted ICD-10-CM. The appropriate value of # should be determined from the data source. The default is version(2019).

Warning: The default value of version() will change over time so that the most recent codes are used. Using the default value rather than specifying a specific version may change results after a new version of the codes is introduced.

Option for icd10cm lookup

version(#) specifies the version of the codes that icd10cm lookup should reference. # indicates the federal fiscal year for the codes. For example, use 2016 for federal fiscal year 2016 (FFY-2016), which is October 1, 2015 to September 30, 2016. icd10cm supports all years after the United States officially adopted ICD-10-CM. The appropriate value of # should be determined from the data source. The default is version(2019).

Warning: The default value of version() will change over time so that the most recent codes are used. Using the default value rather than specifying a specific version may change results after a new version of the codes is introduced.

Options for icd10cm search

or specifies that ICD-10-CM diagnosis codes be searched for descriptions that contain any word specified with icd10cm search. The default is to list only descriptions that contain all the words specified.

matchcase specifies that icd10cm search should match the case of the keywords given on the command line. The default is to perform a case-insensitive search.

version(#) specifies the version of the codes that icd10cm search should reference. # indicates the federal fiscal year for the codes. For example, use 2016 for federal fiscal year 2016 (FFY-2016), which is October 1, 2015 to September 30, 2016. icd10cm supports all years after the United States officially adopted ICD-10-CM.

By default, descriptions for all versions are searched, meaning that codes that changed descriptions and that have descriptions in multiple versions that contain the search terms will be duplicated. To ensure a list of unique code values, specify the version number.

Examples

View the ICD-10-CM diagnosis code version and changes made since icd10cm was implemented in Stata . icd10cm query

Setup . webuse hosp2015 . drop if dmonth < tm(2015m10)

Verify that the variable diag1 has valid codes for federal fiscal year 2016 . icd10cm check diag1, version(2016) summary

Clean the codes to make them more readable, padding the codes with spaces for alignment and storing the result in new variable pdx . icd10cm clean diag1, pad generate(pdx)

Stored results

icd10cm check stores the following in r():

Scalars r(e#) number of errors of type # r(esum) total number of errors r(miss) number of missing values r(N) number of nonmissing values

icd10cm clean stores the following in r():

Scalars r(N) number of changes

icd10cm lookup and icd10cm search store the following in r():

Scalars r(N_codes) number of codes found


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