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The code that indicates the procedure performed during the period covered by the institutional claim.
The ICD-9-CM codes were named as the HIPPA standard code set for inpatient hospital procedures. For inpatient and skilled nursing claims, health care providers use the International Classification of Diseases version 9 (ICD-9) procedure codes to describe the service provided. Starting in October 2015, the ICD-10 Procedure Coding System (ICD-10-PCS), is used.
HCPCS/CPT codes were named as the standard code set for physician services and other health care services.
Source: Medicare Advantage Organizations (MAOs)