G56.9 – Unspecified mononeuropathy of upper limb

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

Non-billable header

ICD-10-CM code G56.9
Code
G56.9 (claims format: G569)
Description
Unspecified mononeuropathy of upper limb
Billable
No – use a more specific code below
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

Billable codes under G56.9

G56.9 is a header code and cannot be used on claims. Choose the most specific code:

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

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-)

Index terms for G56.9

Entries in the ICD-10-CM alphabetic index that lead to this code:

Related codes in G56

Frequently asked questions

What is ICD-10 code G56.9?

G56.9 is the ICD-10-CM code for unspecified mononeuropathy of upper limb, in the block G50-G59 (Nerve, nerve root and plexus disorders).

Is G56.9 a billable code?

No. G56.9 is a header code with more specific child codes; report one of the billable codes listed above.

What category does G56.9 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.