6A4Z1ZZHypothermia, Multiple
- Billable / Specific Code
6A4Z1ZZ is a billable ICD-10-PCS procedure code for Hypothermia, Multiple. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026). The root operation Hypothermia involves extracorporeal lowering of body temperature. In AHRQ's Clinical Classifications Software (CCSR), this procedure falls under Hypothermia 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 | 4 | Hypothermia |
| 4 | BodySystem | Z | None |
| 5 | Duration | 1 | Multiple |
| 6 | Qualifier | Z | No Qualifier |
| 7 | Qualifier | Z | No Qualifier |
In the ICD-10-PCS Alphabetic Index
These FY 2026 ICD-10-PCS Alphabetic Index entries lead to this code:
To code hypothermia of the whole body, open the FY 2026 ICD-10-PCS Alphabetic Index at Hypothermia, then the subterm Whole Body. The index leads to table 6A4, where the duration, qualifier and qualifier values shown in the breakdown above complete the seven-character code 6A4Z1ZZ.
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 6A4Z1ZZ
Is 6A4Z1ZZ a billable code?
Yes. This is a complete seven-character ICD-10-PCS code, specific enough to report Hypothermia, Multiple on inpatient claims from October 1, 2025 through September 30, 2026.
What do the characters in 6A4Z1ZZ 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 4 is the Operation (Hypothermia); the 4th character Z is the BodySystem (None); the 5th character 1 is the Duration (Multiple); the 6th character Z is the Qualifier (No Qualifier); the 7th character Z is the Qualifier (No Qualifier).
What is the ICD-9-PCS equivalent of 6A4Z1ZZ?
Under the General Equivalence Mappings, Hypothermia, Multiple crosswalks to ICD-9-PCS 99.81 (Hypothermia (central) (local)). The mapping is approximate, so confirm it fits the documentation.
