None (GZ) ICD-10-PCS
The GZ body system covers Mental Health procedures on none, with 80 ICD-10-PCS codes across 12 root operations, 56 of them billable in fiscal year 2026. Each root operation defines a distinct procedural objective, and the info icons show the official definition with a preview of the codes inside.
Root Operations in This Body System 12 operations · 80 codes
| Chars 1–3 | Root Operation | Codes | Billable |
|---|---|---|---|
| GZ1 | Psychological TestsThe administration and interpretation of standardized psychological tests and measurement instruments for the assessment of psychological function | 12 | 10 |
| GZ2 | Crisis InterventionTreatment of a traumatized, acutely disturbed or distressed individual for thepurpose of short-term stabilization | 4 | 2 |
| GZ3 | Medication ManagementMonitoring and adjusting the use of medications for the treatment of amental health disorder | 4 | 2 |
| GZ5 | Individual PsychotherapyTreatment of an individual with a mental health disorder by behavioral,cognitive, psychoanalytic, psychodynamic or psychophysiological means to improve functioningor well-being | 20 | 18 |
| GZ6 | CounselingThe application of psychological methods to treat an individual with normaldevelopmental issues and psychological problems in order to increase function, improve well-being, alleviate distress, maladjustment or resolve crises | 8 | 6 |
| GZ7 | Family PsychotherapyTreatment that includes one or more family members of an individualwith a mental health disorder by behavioral, cognitive, psychoanalytic, psychodynamic orpsychophysiological means to improve functioning or well-being | 4 | 2 |
| GZB | Electroconvulsive TherapyThe application of controlled electrical voltages to treat a mentalhealth disorder | 8 | 6 |
| GZC | BiofeedbackProvision of information from the monitoring and regulating of physiologicalprocesses in conjunction with cognitive-behavioral techniques to improve patient functioning orwell-being | 4 | 2 |
| GZF | HypnosisInduction of a state of heightened suggestibility by auditory, visual and tactiletechniques to elicit an emotional or behavioral response | 4 | 2 |
| GZG | NarcosynthesisAdministration of intravenous barbiturates in order to release suppressed orrepressed thoughts | 4 | 2 |
| GZH | Group PsychotherapyTreatment of two or more individuals with a mental health disorder bybehavioral, cognitive, psychoanalytic, psychodynamic or psychophysiological means to improvefunctioning or well-being | 4 | 2 |
| GZJ | Light TherapyApplication of specialized light treatments to improve functioning or well-being | 4 | 2 |
The info icon shows the official root operation definition and previews the codes in that range.
About the GZ Body System
The ICD-10-PCS root operation None (Character GZ) in the Mental Health classification encompasses non-surgical therapeutic and assessment services that do not involve physical alteration of the body. These procedures focus on psychological evaluation, treatment, and management.
Examples of this root operation include a wide range of mental health interventions. Psychological Tests (GZ1) involve administering standardized assessments to evaluate psychological function, while Crisis Intervention (GZ2) provides short-term stabilization for acutely distressed individuals. Medication Management (GZ3) monitors and adjusts psychiatric medications. Psychotherapeutic treatments like Individual Psychotherapy (GZ5), Family Psychotherapy (GZ7), and Group Psychotherapy (GZH) use behavioral or cognitive methods to improve mental well-being. Other examples are Electroconvulsive Therapy (GZB), Biofeedback (GZC), and Light Therapy (GZJ), each representing specialized treatment approaches. These codes accurately document non-invasive mental health procedures essential for clinical care and billing.
Questions About This Page
How many codes are in the GZ body system?
The GZ body system contains 80 ICD-10-PCS codes in FY 2026, organized into 12 root operations. 56 of them are billable on inpatient claims.
What is a root operation?
The root operation is the third character of every ICD-10-PCS code and names the objective of the procedure. Drainage takes fluid out, Excision cuts out a portion of a body part, and Resection removes all of one. Picking the right root operation is the central skill of PCS coding, so each one above carries its official CMS definition.
Related References
Source: CMS FY 2026 ICD-10-PCS order file and code tables, effective October 1, 2025 through September 30, 2026.
