4A07X0ZMeasurement of Visual Acuity, External Approach
- Billable / Specific Code
4A07X0Z is a billable ICD-10-PCS procedure code for Measurement of Visual Acuity, External Approach. It is valid on HIPAA claims for fiscal year 2027 (October 1, 2026 through September 30, 2027). The root operation Measurement involves determining the level of a physiological or physical function at a point in time. The Alphabetic Index lists this code under VEP (visual evoked potential). In AHRQ's Clinical Classifications Software (CCSR), this procedure falls under Measurement and monitoring, NEC.
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 | 4 | Measurement and Monitoring |
| 2 | Body System | A | Physiological Systems |
| 3 | Operation | 0 | Measurement |
| 4 | BodySystem | 7 | Visual |
| 5 | Approach | X | External |
| 6 | Function/Device | 0 | Acuity |
| 7 | Qualifier | Z | No Qualifier |
In the ICD-10-PCS Alphabetic Index
The FY 2027 ICD-10-PCS Alphabetic Index refers to 4A07X0Z as VEP (visual evoked potential). These index entries lead to this code:
To code study of the visual acuity, open the FY 2027 ICD-10-PCS Alphabetic Index at Study, then the subterm Visual acuity. The entry lists 4A07X0Z directly as a complete, billable code.
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 4A07X0Z
Is 4A07X0Z a billable code?
Yes. This is a complete seven-character ICD-10-PCS code, specific enough to report Measurement of Visual Acuity, External Approach on inpatient claims from October 1, 2026 through September 30, 2027.
What is the ICD-10-PCS code for VEP (visual evoked potential)?
The ICD-10-PCS Alphabetic Index lists VEP (visual evoked potential) under code 4A07X0Z, Measurement of Visual Acuity, External Approach, billable on inpatient claims in fiscal year 2027.
What do the characters in 4A07X0Z mean?
The code breaks down character by character: the 1st character 4 is the Section (Measurement and Monitoring); the 2nd character A is the Body System (Physiological Systems); the 3rd character 0 is the Operation (Measurement); the 4th character 7 is the BodySystem (Visual); the 5th character X is the Approach (External); the 6th character 0 is the Function/Device (Acuity); the 7th character Z is the Qualifier (No Qualifier).
What is the ICD-9-PCS equivalent of 4A07X0Z?
Under the General Equivalence Mappings, Measurement of Visual Acuity, External Approach crosswalks to ICD-9-PCS 95.05 (Visual field study), 95.06 (Color vision study), and 95.07 (Dark adaptation study). The mapping is approximate, so confirm it fits the documentation.
