F01Z77ZFacial Nerve Function Assessment using Electrophysiologic Equipment
- Billable / Specific Code
F01Z77Z is a billable ICD-10-PCS procedure code for Facial Nerve Function Assessment using Electrophysiologic Equipment. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026) and groups to MS-DRGs 945, 946. The root operation Motor and/or Nerve Function Assessment involves measurement of motor, nerve, and related functions.
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 | F | Physical Rehabilitation and Diagnostic Audiology |
| 2 | Section Qualifier | 0 | Rehabilitation |
| 3 | Type | 1 | Motor and/or Nerve Function Assessment |
| 4 | BodySystem/Region | Z | None |
| 5 | TypeQualifier | 7 | Facial Nerve Function |
| 6 | Equipment | 7 | Electrophysiologic |
| 7 | Qualifier | Z | None |
Convert to ICD-9-PCS
Closest ICD-9-PCS equivalents for F01Z77Z under the General Equivalence Mappings.
Similar Procedure Codes
Questions About F01Z77Z
Is F01Z77Z a billable code?
Yes. F01Z77Z is a complete seven-character ICD-10-PCS code, specific enough to report Facial Nerve Function Assessment using Electrophysiologic Equipment on inpatient claims from October 1, 2025 through September 30, 2026.
What do the characters in F01Z77Z mean?
F01Z77Z breaks down character by character: the 1st character F is the Section (Physical Rehabilitation and Diagnostic Audiology); the 2nd character 0 is the Section Qualifier (Rehabilitation); the 3rd character 1 is the Type (Motor and/or Nerve Function Assessment); the 4th character Z is the BodySystem/Region (None); the 5th character 7 is the TypeQualifier (Facial Nerve Function); the 6th character 7 is the Equipment (Electrophysiologic); the 7th character Z is the Qualifier (None).
What MS-DRG does F01Z77Z group to?
On an inpatient stay, Facial Nerve Function Assessment using Electrophysiologic Equipment maps to MS-DRGs 945, 946, with relative weights from 1.1468 to 1.5486. The MS-DRG sets the fixed Medicare payment for the stay.
What is the ICD-9-PCS equivalent of F01Z77Z?
Under the General Equivalence Mappings, Facial Nerve Function Assessment using Electrophysiologic Equipment crosswalks to ICD-9-PCS 89.15. The mapping is approximate, so confirm it fits the documentation.
