ICD-10-PCS Conventions

Next, let’s review conventions used in ICD-10-PCS.

• ICD-10-PCS codes have 7 characters. Each character of the 7-character ICD-10-PCS code is an axis of classification that specifies information about the procedure performed. Within a defined code range, a character specifies the same type of information in that axis of classification. For example, the fifth axis of classification specifies the approach in sections 0-4 and 7-9 of the system.
• The valid values for an axis of classification can be added to as needed. For example, if a significantly distinct type of device is used in a new procedure, a new device value can be added to the system.
• The meaning of any single value is a combination of its axis of classification and any preceding values on which it may depend. For example, the meaning of a body part value in the Medical and Surgical section is always dependent on the body system value. The body part value 0 in the Central Nervous System and Cranial Nerves body system specifies Brain, and the body part value 0 in the Peripheral Nervous body system specifies Cervical Plexus.
• When “and” is used in a code description, interpret it as “and/or,” except when used to describe a combination of multiple body parts for which separate values exist for each body part (for example, Skin and Subcutaneous Tissue is used as a qualifier, where there are separate body part values for “Skin” and “Subcutaneous Tissue.” For example, Lower Arm and Wrist Muscle means lower arm and/or wrist muscle).