G61.9Inflammatory polyneuropathy, unspecified

G61.9 is the ICD-10-CM diagnosis code for inflammatory polyneuropathy, unspecified. It belongs to category G61 (inflammatory polyneuropathy), 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.

Within G61, choose G61.9 (unspecified) only when documentation doesn't support a more specific option: Guillain-Barre syndrome (G61.0), serum neuropathy (G61.1) and other inflammatory polyneuropathies (G61.8).

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 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 357.9 (unspecified inflammatory and toxic neuropathy).