Here are key conventions for International Classification of Diseases, 10th Revision, Clinical Modification (ICD-10-CM) code selection in physician practice. Please see your ICD-10-CM reference for complete conventions.

Not elsewhere classified—other or other specified (There is no specific code.)

Not otherwise specified—unspecified (Documentation does not support a more specific code.)

Interpret “and” to mean “and/or.”

Two codes may be required to report diagnosis; sequencing is not defined.

An instruction indicating that when an underlying condition is present, the code for that condition is sequenced before the manifestation code to which the “code first” note applies

Same as “code first” but indicates causal condition may not be present

A single code describing a condition and a manifestation or complication of the condition

A condition occurring during or following medical or surgical care for which a cause-and-effect relationship is documented (eg, hemorrhage following surgery)

The code listed next to a main...

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