Which coding system is used to report inpatient hospital services?

The correct choice indicates that inpatient hospital services are reported using the ICD-10-CM for diagnoses and CPT for procedures. This reflects the standards set for healthcare coding where diagnoses for inpatient services are coded using ICD-10-CM (International Classification of Diseases, Tenth Revision, Clinical Modification). This system provides detailed diagnostic codes that allow healthcare providers to represent the patient's condition accurately.

Further, for inpatient hospital settings, the CPT (Current Procedural Terminology) coding system is utilized to report the procedures performed during the patient's stay. CPT codes are essential for billing and are widely accepted for documenting services rendered to patients. This combination enables comprehensive reporting of both diagnoses and services provided in a hospital environment.

Other options do not accurately cover the coding systems used for inpatient hospital services. For instance, while ICD-9-CM was used historically for diagnoses, it has been outdated since ICD-10-CM was adopted. Likewise, HCPCS is specifically for outpatient services, which does not apply here. The mention of ICD-10-PCS pertains to inpatient procedure coding specifically but does not encompass the full range of coding required, which includes both diagnosis and procedure codes. Thus, the chosen answer accurately reflects the standards and practices in reporting inpatient hospital services.