G50-G59 — Nerve, nerve root and plexus disorders
ICD-10-CM codes G50-G59 cover nerve, nerve root and plexus disorders, within diseases of the nervous system. The block holds 131 codes across 10 categories, of which 106 are billable and 25 are header codes that cannot be submitted on a claim.
Excludes1 — never code together
These conditions cannot occur together. Billing both on the same encounter is a denial.
Risk adjustment in G50-G59
0 codes in this block map to a CMS-HCC, which means the diagnosis carries a risk-adjustment payment when it is documented and coded. Under-coding here is money left on the table; over-coding here is what audits are for.
- HCC 409 Amputation Status, Lower Limb/Amputation Complications
What else to watch in G50-G59
- 36 codes are laterality-specific. They come in left and right pairs, and the pair is mutually exclusive on a single site: coding both without a bilateral code is a contradiction a scrubber should catch before the payer does.
- 106 codes are named in Medicare coverage policies. An LCD or NCD lists them as supporting medical necessity, or explicitly as not supporting it. Which applies depends on the MAC for your state.
Categories in G50-G59
- G50Disorders of trigeminal nerve
- G51Facial nerve disorders
- G52Disorders of other cranial nerves
- G53Cranial nerve disorders in diseases classified elsewhere
- G54Nerve root and plexus disorders
- G55Nerve root and plexus compressions in diseases classified elsewhere
- G56Mononeuropathies of upper limb
- G57Mononeuropathies of lower limb
- G58Other mononeuropathies
- G59Mononeuropathy in diseases classified elsewhere