Is G56 a billable ICD-10-CM code?

No. G56 is a non-billable header code. Code to a higher level of specificity using one of its child codes.

Where does G56 sit in the tabular list?

Diseases of the nervous system (G00-G99), in the block Nerve, nerve root and plexus disorders (G50-G59).

What cannot be coded together with G56?

G56 carries an Excludes1 note, which means the conditions it lists can never be coded together with it on the same encounter.

G56

G56 — Mononeuropathies of upper limb

Non-billable headerICD-10-CM

G56 is a non-billable header ICD-10-CM code for mononeuropathies of upper limb. It cannot be billed on its own: choose one of the more specific child codes below.

Excludes1 — never code together

These conditions cannot occur together. Billing both on the same encounter is a denial.

current traumatic nerve disorder - see nerve injury by body region

Other codes that can never be billed with G56

These codes carry an Excludes1 note pointing at G56. The conflict binds both ways, but ICD-10-CM only writes it down on one side — so you would not find this by reading G56 alone.

M79.2Neuralgia and neuritis, unspecified
M89.0Algoneurodystrophy
G57.7Causalgia of lower limb
G89.2Chronic pain, not elsewhere classified
G90.5Complex regional pain syndrome I (CRPS I)

Risk adjustment

G56 does not map to an HCC and does not risk-adjust under CMS-HCC V28. That is normal — most ICD-10 codes do not. It still needs to be coded correctly; it just will not move a RAF score.

Code to one of these instead G56

7 child codes. Green means billable.

Questions about G56

Is G56 a billable ICD-10-CM code?: No. G56 is a non-billable header code. Code to a higher level of specificity using one of its child codes.
Where does G56 sit in the tabular list?: Diseases of the nervous system (G00-G99), in the block Nerve, nerve root and plexus disorders (G50-G59).
What cannot be coded together with G56?: G56 carries an Excludes1 note, which means the conditions it lists can never be coded together with it on the same encounter.