ICD-10-CM 2027
ICD-10 code for inflammatory polyneuropathy
From the official ICD-10-CM alphabetic index entry “Polyneuropathy (peripheral) › inflammatory”. Page updated September 29, 2026.
About coding inflammatory polyneuropathy
The ICD-10-CM code for inflammatory polyneuropathy is G61.9 (Inflammatory polyneuropathy, unspecified). The official index lists 3 more specific codes, so check the documentation for details such as type, cause, site or severity before settling on G61.9.
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.
More specific inflammatory polyneuropathy codes (official index)
Common questions about inflammatory polyneuropathy ICD-10 codes
What is the ICD-10 code for inflammatory polyneuropathy?
- G61.9 — Inflammatory polyneuropathy, unspecified. More specific codes apply when the documentation supports them: G61.81, G65.1, G61.89.
What is the ICD-10 code for chronic demyelinating inflammatory polyneuropathy?
- G61.81 — Chronic inflammatory demyelinating polyneuritis.
What is the ICD-10 code for sequelae inflammatory polyneuropathy?
- G65.1 — Sequelae of other inflammatory polyneuropathy.
Is G61.9 billable?
- Yes. G61.9 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can G61.9 be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict G61.9 as a principal diagnosis.
Is G61.9 a CC or MCC?
- No. G61.9 is neither a CC nor an MCC under MS-DRG v44.0.