G56.20 – Lesion of ulnar nerve, unspecified upper limb

ICD-10-CM 2027 diagnosis code · Nerve, nerve root and plexus disorders

Billable code

ICD-10-CM code G56.20

Code: G56.20 (claims format: G5620)
Description: Lesion of ulnar nerve, unspecified upper limb
Billable: Yes – valid for HIPAA-covered transactions
Valid for: Dates of service October 1, 2026 – September 30, 2027 (FY2027)
Chapter: 6. Diseases of the nervous system (G00-G99)
Block: G50-G59 Nerve, nerve root and plexus disorders
Parent codes: G56 › G56.2

Notes inherited from parent codes

Instructional notes at a category or block level apply to every code below it.

G56 – Mononeuropathies of upper limb

Excludes1 (not coded here):

current traumatic nerve disorder - see nerve injury by body region

G56.2 – Lesion of ulnar nerve

Applicable to:

Tardy ulnar nerve palsy

Block G50-G59

Excludes1 (not coded here):

current traumatic nerve, nerve root and plexus disorders - see Injury, nerve by body region
neuralgia NOS (M79.2)
neuritis NOS (M79.2)
peripheral neuritis in pregnancy (O26.82-)
radiculitis NOS (M54.1-)

Related codes in G56.2

Frequently asked questions

What is ICD-10 code G56.20?

G56.20 is the ICD-10-CM code for lesion of ulnar nerve, unspecified upper limb, in the block G50-G59 (Nerve, nerve root and plexus disorders).

Is G56.20 a billable code?

Yes. G56.20 is a billable/specific code that can be used to indicate a diagnosis for reimbursement purposes.

What category does G56.20 belong to?

It belongs to category G56 – Mononeuropathies of upper limb.

Source: CDC/NCHS ICD-10-CM FY2027 code files, tabular list and index. Reference only – code assignment must follow the official ICD-10-CM guidelines and documentation in the medical record.