6A550Z1Pheresis of Leukocytes, Single
- Billable / Specific Code
6A550Z1 is a billable ICD-10-PCS procedure code for Pheresis of Leukocytes, Single. It is valid on HIPAA claims for fiscal year 2027 (October 1, 2026 through September 30, 2027). The root operation Pheresis involves extracorporeal separation of blood products. In AHRQ's Clinical Classifications Software (CCSR), this procedure falls under Pheresis therapy.
Code Identity
PCS Table Breakdown
Each ICD-10-PCS code is built from seven characters, each an axis of the procedure. Hover or tap the icons for the official CMS definitions.
| Position | Designation | Value | Meaning |
|---|---|---|---|
| 1 | Section | 6 | Extracorporeal or Systemic Therapies |
| 2 | Body System | A | Physiological Systems |
| 3 | Operation | 5 | Pheresis |
| 4 | BodySystem | 5 | Circulatory |
| 5 | Duration | 0 | Single |
| 6 | Qualifier | Z | No Qualifier |
| 7 | Qualifier | 1 | Leukocytes |
In the ICD-10-PCS Alphabetic Index
These FY 2027 ICD-10-PCS Alphabetic Index entries lead to this code:
To code pheresis of the plasma, open the FY 2027 ICD-10-PCS Alphabetic Index at Pheresis, then the subterm Plasma. The index leads to table 6A5, where the duration, qualifier and qualifier values shown in the breakdown above complete the seven-character code 6A550Z1.
Clinical Classification (CCSR)
AHRQ groups this procedure code into these clinical categories.
Convert to ICD-9-PCS
Closest ICD-9-PCS equivalents for this code under the General Equivalence Mappings.
Similar Procedure Codes
Questions About 6A550Z1
Is 6A550Z1 a billable code?
Yes. This is a complete seven-character ICD-10-PCS code, specific enough to report Pheresis of Leukocytes, Single on inpatient claims from October 1, 2026 through September 30, 2027.
What do the characters in 6A550Z1 mean?
The code breaks down character by character: the 1st character 6 is the Section (Extracorporeal or Systemic Therapies); the 2nd character A is the Body System (Physiological Systems); the 3rd character 5 is the Operation (Pheresis); the 4th character 5 is the BodySystem (Circulatory); the 5th character 0 is the Duration (Single); the 6th character Z is the Qualifier (No Qualifier); the 7th character 1 is the Qualifier (Leukocytes).
What is the ICD-9-PCS equivalent of 6A550Z1?
Under the General Equivalence Mappings, Pheresis of Leukocytes, Single crosswalks to ICD-9-PCS 99.72 (Therapeutic leukopheresis). The mapping is approximate, so confirm it fits the documentation.
