6A4Z0ZZHypothermia, Single

Extracorporeal or Systemic Therapies›Physiological Systems›Hypothermia

Billable / Specific Code

ICD-10-PCS 6A4Z0ZZ

CMS Source: FY 2026 ICD-10-PCS dataset. Effective Oct 1, 2025 – Sep 30, 2026.

6A4Z0ZZ is a billable ICD-10-PCS procedure code for Hypothermia, Single. 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.

Code Identity

ICD-10-PCS Code

6A4Z0ZZ

Billable Status

Yes — Valid for Submission

Code Describes

Hypothermia, Single

Parent Code

6A4 Extracorporeal or Systemic Therapies, Physiological Systems, Hypothermia

Short Description

Hypothermia, Single

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	0	Single
6	Qualifier	Z	No Qualifier
7	Qualifier	Z	No Qualifier

Convert to ICD-9-PCS

Closest ICD-9-PCS equivalents for 6A4Z0ZZ under the General Equivalence Mappings.

99.81

Approximate match.

Similar Procedure Codes

Questions About 6A4Z0ZZ

Is 6A4Z0ZZ a billable code?

Yes. 6A4Z0ZZ is a complete seven-character ICD-10-PCS code, specific enough to report Hypothermia, Single on inpatient claims from October 1, 2025 through September 30, 2026.

What do the characters in 6A4Z0ZZ mean?

6A4Z0ZZ 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 0 is the Duration (Single); 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 6A4Z0ZZ?

Under the General Equivalence Mappings, Hypothermia, Single crosswalks to ICD-9-PCS 99.81. The mapping is approximate, so confirm it fits the documentation.