What are additional codes called in ICD-10 that provide extra detail?

The correct term for additional codes in ICD-10 that provide extra detail is "sub-codes." In the ICD-10 classification system, sub-codes are used to clarify the specificity of a diagnosis. They allow healthcare providers to convey more precise information about a patient's condition, including the severity, location, or chronicity of a disease. This enhanced detail is crucial for accurate coding, billing, and understanding patient populations.

Sub-codes expand upon the main code, providing deeper insight into the patient’s health status, which can influence treatment decisions and outcomes. This specificity is critical for public health data collection, research purposes, and the development of treatment guidelines.

While modifiers, annotations, and extensions all serve specific purposes in coding, they do not refer to the additional numeric codes that supplement the primary diagnosis in the way that sub-codes do. Modifiers often denote adjustments to a procedure or service, annotations help provide context or notes about particular codes, and extensions may add additional information about external causes or additional factors influencing health conditions.