https://www.aapc.com/icd-10/conversion-mapping.aspx
The below tutorial explains ICD-9 to ICD-10 conversion and mapping. For help
with converting codes, refer to our online ICD-10 code conversion tool, see our ICD-9
to ICD-10 crosswalks by specialty, or consider our ICD-10 mapping services.
One of the identified benefits for the United States' transition from ICD-9
to ICD-10 is because of the increased level of specificity offered by the
ICD-10 code format. This specificity will benefit patients and doctors (by
giving more detailed diagnosis and treatment information), payers (by more
accurately defining services) and international organizations that monitor
worldwide disease.
However, all of this increased specificity comes at a price—the codes are
becoming more complex. In ICD-9-CM, codes are three to five digits. The first
digit is either numeric or alpha (the letters E or V only) and all other digits
are numeric.
In ICD-10-CM, however, codes can be up to seven digits. The first digit is
always alpha (it can be any letter except U), the second digit is always
numeric, and the remaining five digits can be any combination.
The following example shows an ICD-10-CM code for chronic gout due to renal
impairment, left shoulder, without tophus.
The corresponding ICD-9-CM code would have been 274.02, which only indicates
gouty arthropathy. As you can see, the ICD-10-CM code contains much more
information. Mapping
Some ICD-9-CM codes map easily to ICD-10 in a simple one-to-one conversion.
For example, the ICD-9-CM code 733.6 (Tietze's Syndrome) maps directly to the
ICD-10-CM code M94.0. (An exact map does not always mean the codes match in
detail.)
Other codes will require additional information to map for possible
solutions. For example, the ICD-9-CM code 649.51 (spotting complicating
pregnancy) requires information about weeks in pregnancy to map. There are
three options: O26.851 (spotting complicating pregnancy, first trimester),
O26.852 (spotting complicating pregnancy, second trimester), and O26.853
(spotting complicating pregnancy, third trimester).
The below tutorial explains ICD-9 to ICD-10 conversion and mapping. For help
with converting codes, refer to our online ICD-10 code conversion tool, see our ICD-9
to ICD-10 crosswalks by specialty, or consider our ICD-10 mapping services.
One of the identified benefits for the United States' transition from ICD-9
to ICD-10 is because of the increased level of specificity offered by the
ICD-10 code format. This specificity will benefit patients and doctors (by
giving more detailed diagnosis and treatment information), payers (by more
accurately defining services) and international organizations that monitor
worldwide disease.
However, all of this increased specificity comes at a price—the codes are
becoming more complex. In ICD-9-CM, codes are three to five digits. The first
digit is either numeric or alpha (the letters E or V only) and all other digits
are numeric.
In ICD-10-CM, however, codes can be up to seven digits. The first digit is
always alpha (it can be any letter except U), the second digit is always
numeric, and the remaining five digits can be any combination.
The following example shows an ICD-10-CM code for chronic gout due to renal
impairment, left shoulder, without tophus.
The corresponding ICD-9-CM code would have been 274.02, which only indicates
gouty arthropathy. As you can see, the ICD-10-CM code contains much more
information. Mapping
Some ICD-9-CM codes map easily to ICD-10 in a simple one-to-one conversion.
For example, the ICD-9-CM code 733.6 (Tietze's Syndrome) maps directly to the
ICD-10-CM code M94.0. (An exact map does not always mean the codes match in
detail.)
Other codes will require additional information to map for possible
solutions. For example, the ICD-9-CM code 649.51 (spotting complicating
pregnancy) requires information about weeks in pregnancy to map. There are
three options: O26.851 (spotting complicating pregnancy, first trimester),
O26.852 (spotting complicating pregnancy, second trimester), and O26.853
(spotting complicating pregnancy, third trimester).