2026 ICD-10-CM Diagnosis Code G56.23Lesion of ulnar nerve, bilateral upper limbs

ICD-10-CM Codes›G00–G99›G50-G59›G56

ICD-10-CM G56.23
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

G56.23 is a billable ICD-10-CM diagnosis code for lesion of ulnar nerve, bilateral upper limbs. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026). In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Nerve and nerve root disorders.

Code Identity

ICD-10-CM Code
G56.23
Billable Status
Yes — Valid for Submission
Code Describes
Lesion of ulnar nerve, bilateral upper limbs
Short Description
Lesion of ulnar nerve, bilateral upper limbs
Same as the full description in the CMS dataset.
Parent Code
G56.2
Lesion of ulnar nerve

Code Classification

ChapterG00–G99Diseases of the nervous system
SectionG50-G59Nerve, nerve root and plexus disorders
CategoryG56Mononeuropathies of upper limb
This CodeG56.23Lesion of ulnar nerve, bilateral upper limbs

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Bilateral entrapment of peripheral nerve of upper limbs
  • Bilateral entrapment of ulnar nerves
  • Bilateral entrapment of ulnar nerves at elbow
  • Bilateral entrapment of ulnar nerves at wrist
  • Bilateral inflammation of ulnar nerves
  • Bilateral lesion of ulnar nerves
  • Bilateral ulnar nerve disorder
  • Bilateral upper limb mononeuropathy
  • Bilateral upper limb nerve inflammation
  • Entrapment of left ulnar nerve
  • Entrapment of left ulnar nerve at elbow
  • Entrapment of right ulnar nerve
  • Entrapment of right ulnar nerve at elbow
  • Entrapment of ulnar nerve at left wrist
  • Entrapment of ulnar nerve at right wrist
  • Inflammation of peripheral nerve of left upper limb
  • Inflammation of peripheral nerve of right upper limb
  • Lesion of left ulnar nerve
  • Lesion of right ulnar nerve
  • Neuritis of left ulnar nerve
  • Neuritis of right ulnar nerve
  • Ulnar nerve entrapment at elbow
  • Ulnar nerve entrapment at wrist
  • Ulnar neuritis
  • Ulnar neuropathy at wrist

Clinical ClassificationClinical

AHRQ’s CCSR groups this code into broader clinical categories.

CCSR NVS017
Nerve and nerve root disorders
Default principal diagnosis: inpatient Yes · outpatient Yes

Convert G56.23 to ICD-9-CMHistory

The closest ICD-9-CM equivalents under the General Equivalence Mappings.

ICD-9-CM
354.2 Ulnar nerve lesion
Approximate The match is approximate rather than exact.

Code History & ChangesHistory

Replacement G56.23 replaces the following previously assigned code(s):

  • G56.21 - Lesion of ulnar nerve, right upper limb
  • G56.22 - Lesion of ulnar nerve, left upper limb
FY 2018AddedAdded to the ICD-10-CM code setEffective October 1, 2017.
FY 2019–2025No changes
FY 2026CurrentCurrent code set, no changesEffective October 1, 2025 through September 30, 2026.

Questions About G56.23Overview

Is G56.23 (Lesion of ulnar nerve) a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report lesion of ulnar nerve, bilateral upper limbs on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

What is the ICD-9 equivalent of G56.23?

Under the General Equivalence Mappings, lesion of ulnar nerve, bilateral upper limbs converts to ICD-9-CM 354.2 (ulnar nerve lesion). The mapping is approximate, so confirm the match fits the documentation.

Footnotes

[1] Chronic - a chronic condition code indicates a condition lasting 12 months or longer and its effect on the patient based on one or both of the following criteria:

  • The condition results in the need for ongoing intervention with medical products,treatment, services, and special equipment
  • The condition places limitations on self-care, independent living, and social interactions.