ICD-10-PCS Code For Ulnar Nerve: Procedure Code Group Overview

The International Classification of Diseases, Tenth Revision, Procedure Coding System (ICD-10-PCS) code group 01X4 includes procedures performed to transfer nerves in the ulnar nerve. These ICD-10-PCS codes are used for inpatient documentation when a portion or all of the ulnar nerve is moved endoscopically to assume the function of another nerve or body part. Accurate coding within the ICD-10-PCS 01X4 group is essential for proper inpatient reimbursement, as it captures the specific transfer procedure performed and supports clinical documentation accuracy.

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Ulnar Nerve Transfer Procedure Overview

This procedure group includes percutaneous endoscopic transfer operations performed on the ulnar nerve within the peripheral nervous system. These procedures involve moving all or a portion of the ulnar nerve to another location to take over the function of a body part, using percutaneous endoscopic techniques. Accurate ICD-10-PCS coding of these transfers is important for inpatient reimbursement because it documents the specific nerve targeted and the transfer operation performed, which affects case mix and payment.

Code Attributes

Character	ICD-10-PCS Category	Code Group Details
0	Section	Medical and Surgical
1	Body System	Peripheral Nervous System
X	Operation	Transfer
4	Body Part	Ulnar Nerve

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ICD-10-PCS Code For Ulnar Nerve: Procedure Code Group Overview

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Ulnar Nerve Transfer Procedure Overview

Code Attributes

Character	ICD-10-PCS Category	Code Group Details
0	Section	Medical and Surgical
1	Body System	Peripheral Nervous System
X	Operation	Transfer
4	Body Part	Ulnar Nerve

When to Use

Use a code from this group when an inpatient procedure involves endoscopic percutaneous transfer of the ulnar nerve to restore or reassign function. Do not use these codes for open transfer techniques or for procedures on other peripheral nerves.

ICD-10-PCS Codes

6 rows

ICD-10-PCS Code	Description
01X40Z4	Transfer Ulnar Nerve to Ulnar Nerve, Open Approach
01X40Z5	Transfer Ulnar Nerve to Median Nerve, Open Approach
01X40Z6	Transfer Ulnar Nerve to Radial Nerve, Open Approach
01X44Z4	Transfer Ulnar Nerve to Ulnar Nerve, Percutaneous Endoscopic Approach
01X44Z5	Transfer Ulnar Nerve to Median Nerve, Percutaneous Endoscopic Approach
01X44Z6	Transfer Ulnar Nerve to Radial Nerve, Percutaneous Endoscopic Approach

DRG Codes

3 rows

DRG Code	Description
040	Peripheral, Cranial Nerve and Other Nervous System Procedures with MCC
041	Peripheral, Cranial Nerve and Other Nervous System Procedures with CC or Peripheral Neurostimulator
042	Peripheral, Cranial Nerve and Other Nervous System Procedures without CC/MCC

Typical Clinical Scenarios

Planned reconstructive transfer for a patient with a chronic high ulnar nerve palsy after a brachial plexus injury. The patient has persistent intrinsic hand muscle paralysis and sensory loss in the ulnar distribution despite months of conservative therapy; inpatient percutaneous endoscopic transfer of a segment of the ulnar nerve to the median nerve is performed electively to restore hand function. The transfer uses endoscopic percutaneous techniques to route the ulnar nerve fibers to reinnervate median-innervated muscles and improve pinch and grip strength. Typical codes: 01X44Z5
Acute presentation after traumatic forearm injury with an avulsed or nonviable median nerve branch resulting in loss of key hand function. In the inpatient setting, the surgical team performs an urgent percutaneous endoscopic transfer of a portion of the ulnar nerve to the radial nerve to reestablish motor innervation to affected extensor compartments and preserve limb function. The goal is timely transfer using a minimally invasive endoscopic approach to reduce morbidity while restoring critical motor pathways. Typical codes: 01X44Z6
Revision procedure for a patient with failed prior open nerve reconstruction where the original graft did not restore function and the patient has progressive intrinsic muscle atrophy. The team elects an inpatient percutaneous endoscopic transfer of ulnar nerve fibers to the ulnar nerve more distally to redirect functioning fascicles and attempt salvage of residual function; the approach is percutaneous endoscopic due to scar tissue from prior open surgery. This revision targets improving conduction and motor function by relocating viable nerve tissue within the same nerve distribution. Typical codes: 01X44Z4

Related Codes

01X1-CERVICAL-NERVE-TRANSFER

ICD-10-PCS Code For Cervical Nerve: Procedure Code Group Overview

01X2-PHRENIC-NERVE-TRANSFER

ICD-10-PCS Code For Phrenic Nerve: Procedure Code Group Overview

01X5-MEDIAN-NERVE-TRANSFER

ICD-10-PCS Code For Median Nerve: Procedure Code Group Overview

01X6-RADIAL-NERVE-TRANSFER

ICD-10-PCS Code For Radial Nerve: Procedure Code Group Overview

01X8-THORACIC-NERVE-TRANSFER

ICD-10-PCS Code For Thoracic Nerve: Procedure Code Group Overview

01XB-LUMBAR-NERVE-TRANSFER

ICD-10-PCS Code For Lumbar Nerve: Procedure Code Group Overview

01XC-PUDENDAL-NERVE-TRANSFER

ICD-10-PCS Code For Pudendal Nerve: Procedure Code Group Overview

01XD-FEMORAL-NERVE-TRANSFER

ICD-10-PCS Code For Femoral Nerve: Procedure Code Group Overview

01XF-SCIATIC-NERVE-TRANSFER

ICD-10-PCS Code For Sciatic Nerve: Procedure Code Group Overview

01XG-TIBIAL-NERVE-TRANSFER

ICD-10-PCS Code For Tibial Nerve: Procedure Code Group Overview

Showing 1–10 of 11

Frequently Asked Questions

References

1.CPT® Codes and Descriptions. AAPC. Retrieved Aug 11, 2026.Maintains the CPT code set's official descriptions and guidelines, licensed from the American Medical Association, used as the definitional source for CPT codes on this page.
2.HCPCS Quarterly Update. Centers for Medicare & Medicaid Services (CMS). Retrieved Aug 11, 2026.CMS's quarterly release of HCPCS Level II codes and short/long descriptors, the source for HCPCS code definitions and update history.
3.ICD-10-CM Full Code List. Centers for Medicare & Medicaid Services (CMS). Retrieved Aug 11, 2026.CMS's complete ICD-10-CM diagnosis code list, used to cross-reference diagnosis codes associated with this procedure or service.

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When to Use

ICD-10-PCS Codes

6 rows

ICD-10-PCS Code	Description
01X40Z4	Transfer Ulnar Nerve to Ulnar Nerve, Open Approach
01X40Z5	Transfer Ulnar Nerve to Median Nerve, Open Approach
01X40Z6	Transfer Ulnar Nerve to Radial Nerve, Open Approach
01X44Z4	Transfer Ulnar Nerve to Ulnar Nerve, Percutaneous Endoscopic Approach
01X44Z5	Transfer Ulnar Nerve to Median Nerve, Percutaneous Endoscopic Approach
01X44Z6	Transfer Ulnar Nerve to Radial Nerve, Percutaneous Endoscopic Approach

DRG Codes

3 rows

DRG Code	Description
040	Peripheral, Cranial Nerve and Other Nervous System Procedures with MCC
041	Peripheral, Cranial Nerve and Other Nervous System Procedures with CC or Peripheral Neurostimulator
042	Peripheral, Cranial Nerve and Other Nervous System Procedures without CC/MCC

Typical Clinical Scenarios

Planned reconstructive transfer for a patient with a chronic high ulnar nerve palsy after a brachial plexus injury. The patient has persistent intrinsic hand muscle paralysis and sensory loss in the ulnar distribution despite months of conservative therapy; inpatient percutaneous endoscopic transfer of a segment of the ulnar nerve to the median nerve is performed electively to restore hand function. The transfer uses endoscopic percutaneous techniques to route the ulnar nerve fibers to reinnervate median-innervated muscles and improve pinch and grip strength. Typical codes: 01X44Z5
Acute presentation after traumatic forearm injury with an avulsed or nonviable median nerve branch resulting in loss of key hand function. In the inpatient setting, the surgical team performs an urgent percutaneous endoscopic transfer of a portion of the ulnar nerve to the radial nerve to reestablish motor innervation to affected extensor compartments and preserve limb function. The goal is timely transfer using a minimally invasive endoscopic approach to reduce morbidity while restoring critical motor pathways. Typical codes: 01X44Z6
Revision procedure for a patient with failed prior open nerve reconstruction where the original graft did not restore function and the patient has progressive intrinsic muscle atrophy. The team elects an inpatient percutaneous endoscopic transfer of ulnar nerve fibers to the ulnar nerve more distally to redirect functioning fascicles and attempt salvage of residual function; the approach is percutaneous endoscopic due to scar tissue from prior open surgery. This revision targets improving conduction and motor function by relocating viable nerve tissue within the same nerve distribution. Typical codes: 01X44Z4

Related Codes

01X1-CERVICAL-NERVE-TRANSFER

ICD-10-PCS Code For Cervical Nerve: Procedure Code Group Overview

01X2-PHRENIC-NERVE-TRANSFER

ICD-10-PCS Code For Phrenic Nerve: Procedure Code Group Overview

01X5-MEDIAN-NERVE-TRANSFER

ICD-10-PCS Code For Median Nerve: Procedure Code Group Overview

01X6-RADIAL-NERVE-TRANSFER

ICD-10-PCS Code For Radial Nerve: Procedure Code Group Overview

01X8-THORACIC-NERVE-TRANSFER

ICD-10-PCS Code For Thoracic Nerve: Procedure Code Group Overview

01XB-LUMBAR-NERVE-TRANSFER

ICD-10-PCS Code For Lumbar Nerve: Procedure Code Group Overview

01XC-PUDENDAL-NERVE-TRANSFER

ICD-10-PCS Code For Pudendal Nerve: Procedure Code Group Overview

01XD-FEMORAL-NERVE-TRANSFER

ICD-10-PCS Code For Femoral Nerve: Procedure Code Group Overview

01XF-SCIATIC-NERVE-TRANSFER

ICD-10-PCS Code For Sciatic Nerve: Procedure Code Group Overview

01XG-TIBIAL-NERVE-TRANSFER

ICD-10-PCS Code For Tibial Nerve: Procedure Code Group Overview

Showing 1–10 of 11

Frequently Asked Questions

References

1.CPT® Codes and Descriptions. AAPC. Retrieved Aug 11, 2026.Maintains the CPT code set's official descriptions and guidelines, licensed from the American Medical Association, used as the definitional source for CPT codes on this page.
2.HCPCS Quarterly Update. Centers for Medicare & Medicaid Services (CMS). Retrieved Aug 11, 2026.CMS's quarterly release of HCPCS Level II codes and short/long descriptors, the source for HCPCS code definitions and update history.
3.ICD-10-CM Full Code List. Centers for Medicare & Medicaid Services (CMS). Retrieved Aug 11, 2026.CMS's complete ICD-10-CM diagnosis code list, used to cross-reference diagnosis codes associated with this procedure or service.

Published by

Trek Health powers OpenPayer with a leading commercial payer intelligence platform, seamlessly converting fragmented payer data into actionable insights for provider organizations.

ICD-10-PCS Code For Ulnar Nerve: Procedure Code Group Overview

Sign up for ICD-10-PCS Code For Ulnar Nerve: Procedure Code Group Overview policy alerts

Ulnar Nerve Transfer Procedure Overview

Code Attributes

ICD-10-PCS Code For Ulnar Nerve: Procedure Code Group Overview

Sign up for ICD-10-PCS Code For Ulnar Nerve: Procedure Code Group Overview policy alerts

Ulnar Nerve Transfer Procedure Overview

Code Attributes

When to Use

ICD-10-PCS Codes

DRG Codes

Typical Clinical Scenarios

Related Codes

Which ICD-10-PCS section and operation describe the ulnar nerve transfer procedures in this group?

What are the percutaneous endoscopic codes for ulnar nerve transfers listed in this group?

How do the open approach codes differ from the percutaneous endoscopic codes in this group?

Why is accurate coding within the `01X4` group important for inpatient reimbursement?

Which DRGs are related to the procedures in the `01X4` code group?

References

When to Use

ICD-10-PCS Codes

DRG Codes

Typical Clinical Scenarios

Related Codes

Which ICD-10-PCS section and operation describe the ulnar nerve transfer procedures in this group?

What are the percutaneous endoscopic codes for ulnar nerve transfers listed in this group?

How do the open approach codes differ from the percutaneous endoscopic codes in this group?

Why is accurate coding within the `01X4` group important for inpatient reimbursement?

Which DRGs are related to the procedures in the `01X4` code group?

References