Which classification system is most widely used for inpatient hospital settings in the United States?

The classification system recognized as the most widely used for inpatient hospital settings in the United States is the combination of ICD-10-CM for diagnoses and ICD-10-PCS for procedures. This system was implemented to replace the earlier ICD-9-CM, which had limitations and outdated codes, thus providing a more comprehensive and detailed approach to coding and classifying diseases and procedures.

ICD-10-CM allows for a broader range of codes, which enhances specificity and accuracy in diagnoses. ICD-10-PCS, on the other hand, was specifically designed to capture data related to inpatient hospital procedures in a more detailed manner. This dual coding structure reflects the complexity of modern healthcare, accommodating advances in medical knowledge and technology, ensuring accurate billing, and supporting health data reporting and research.

In contrast, while HCPCS Level II is important for covering non-physician services and supplies, it is not primarily used specifically for inpatient settings. ICD-9-CM, although historically significant, has been largely phased out in favor of ICD-10, and CPT coding is more applicable to outpatient settings rather than inpatient hospital environments. Therefore, the integration of ICD-10-CM and ICD-10-PCS stands out as the standard for inpatient coding in the