Final answer:
ICD-10-PCS was first released in 1998, but it was officially implemented and replaced the ICD-9-CM for inpatient hospital procedure coding on October 1, 2015.
Step-by-step explanation:
The International Classification of Diseases, Tenth Revision, Procedure Coding System (ICD-10-PCS) was first released in 1998. This coding system is used by healthcare professionals in the United States for reporting inpatient procedures. Its development began in 1992 and was completed by 1998. However, it wasn’t until October 1, 2015, that ICD-10-PCS officially replaced the previous ICD-9-CM version for inpatient hospital procedure coding. This highlights that while the initial release was in 1998, its actual implementation and use in the healthcare system occurred much later in 2015.