G63Polyneuropathy in diseases classified elsewhere

G63 is the ICD-10-CM diagnosis code for polyneuropathy in diseases classified elsewhere. It belongs to block G60-G65 (polyneuropathies and other disorders of the peripheral nervous system) and chapter 6 (diseases of the nervous system). It is billable, so it can be reported on its own for dates of service from October 1, 2026 through September 30, 2027.

Don't report G63 together with the conditions in its Excludes1 note: diabetes mellitus (E08-E13 with .42), diphtheria (A36.83), infectious mononucleosis complicated by polyneuropathy (B27.0-B27.9 with fifth character 1), Lyme disease (A69.22) and 5 more.

Code first underlying disease, such as: amyloidosis (E85.-), endocrine disease, except diabetes (E00-E07, E15-E16, E20-E34), metabolic diseases (E70-E88), neoplasm (C00-D49) and 1 more.

It is not a CC or MCC, so as a secondary diagnosis it doesn't change the MS-DRG severity level.

In MS-DRG v44.0, it is part of the grouping logic for DRG 073 (Cranial and Peripheral Nerve Disorders with MCC, relative weight 1.5779) and DRG 074 (Cranial and Peripheral Nerve Disorders without MCC, relative weight 1.0173), in MDC 01 (Diseases and Disorders of the Nervous System), as a principal or secondary diagnosis. The DRG a claim lands in depends on the principal diagnosis, procedures and any CC/MCC secondary diagnoses.

It is a manifestation code, so it describes the effect of an underlying disease and can't be the principal diagnosis. Code the underlying condition first.

It has been part of ICD-10-CM since the code set took effect on October 1, 2015 and hasn't changed since.

Before ICD-10, this condition was coded in ICD-9-CM as 357.4 (polyneuropathy in other diseases classified elsewhere).