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ICD-10-PCS 2027 procedure code

F01Z77ZFacial Nerve Function Assessment using Electrophysiologic Equipment

✓ Valid for 2027Non-O.R. procedure

Short description: Facial Nerve Funct Assess w Electrophysiologic Equip

Code unchanged since ICD-10-PCS took effect on October 1, 2015. Source: official FY2027 ICD-10-PCS release from CMS. Page updated September 29, 2026. About our data

About F01Z77Z

F01Z77Z is the ICD-10-PCS code for a motor and/or nerve function assessment procedure on the none using a facial nerve function approach with electrophysiologic (qualifier: none). In ICD-10-PCS, motor and/or nerve function assessment means measurement of motor, nerve, and related functions.

In plain terms, this corresponds to other nonoperative neurologic function tests, the ICD-9-CM procedure title it maps to (89.15).

It is a non-O.R. procedure that is part of the MS-DRG logic for DRG 945 (Rehabilitation with CC/MCC) and DRG 946 (Rehabilitation without CC/MCC), under the surgical category “Rehabilitation”.

It has been valid since ICD-10-PCS took effect on October 1, 2015.

What each character means

1. Section
FPhysical Rehabilitation and Diagnostic Audiology
2. Section Qualifier
0Rehabilitation
3. Type
1Motor and/or Nerve Function Assessment

Measurement of motor, nerve, and related functions

4. Body System / Region
ZNone
5. Type Qualifier
7Facial Nerve Function

Measures electrical activity of the VIIth cranial nerve (facial nerve)

6. Equipment
7Electrophysiologic
7. Qualifier
ZNone

MS-DRG v44.0 grouping

All DRGs →

Surgical MS-DRGs this procedure can group to, depending on the principal diagnosis's MDC.

MDC 23 · Factors Influencing Health Status and Other Contacts with Health Services · Rehabilitation

ICD-9-CM equivalent

Converter →
  • 89.15Other nonoperative neurologic function testsapproximate

From the CMS 2018 General Equivalence Mappings (GEMs), the final GEMs release.

Code history

  1. 2016
  2. 2017
  3. 2018
  4. 2019
  5. 2020
  6. 2021
  7. 2022
  8. 2023
  9. 2024
  10. 2025
  11. 2026
  12. 2027
  • FY2016 (effective 10/1/2015): Added (first year of ICD-10-CM)
  • No changes since FY2016.

Common questions about F01Z77Z

Is F01Z77Z a valid ICD-10-PCS code for 2027?

Yes. F01Z77Z is valid for inpatient procedures from October 1, 2026 through September 30, 2027.

Is F01Z77Z an O.R. procedure?

No. F01Z77Z is designated non-O.R. in MS-DRG v44.0.

What DRG does F01Z77Z group to?

Depending on the principal diagnosis, F01Z77Z can group to MS-DRG 945 and MS-DRG 946.

What is the ICD-9 procedure code for F01Z77Z?

The CMS GEMs map F01Z77Z to ICD-9-CM 89.15 (Other nonoperative neurologic function tests).