All ICD10 Codes
G63Billable, valid for claims from October 1, 2026

Polyneuropathy in diseases classified elsewhere

In Polyneuropathies and other disorders of the peripheral nervous system (G60-G65), chapter 6: Diseases of the Nervous System

  • G63 is billable and valid on claims for FY 2027. If the record has more detail, check the other codes under G60-G65 below.
  • As a secondary diagnosis it is not a CC or MCC, so it doesn't raise the MS-DRG payment.
  • Doesn't count toward a Medicare Advantage risk score (no HCC in V28; it was HCC 75 in V24).
  • AHRQ's Chronic Condition Indicator classes it as chronic: expected to last 12 months or longer and to limit daily life or need ongoing care.
  • Can't be the principal diagnosis: code the underlying condition first. (Manifestation list)

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Instructional notes

Excludes1: not coded here, use a different code

  • polyneuropathy (in):
  • 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)
  • mumps (B26.84)
  • postherpetic (B02.23)
  • rheumatoid arthritis (M05.5-)
  • scleroderma (M34.83)
  • systemic lupus erythematosus (M32.19)

Code first: code the underlying condition first, then this code

Also applies, from Polyneuropathies and other disorders of the peripheral nervous system (G60-G65)

These notes sit on G60-G65 and apply to every code under it, including G63.

Excludes1: not coded here, use a different code

Official coding guidelines

From the ICD-10-CM Official Guidelines for Coding and Reporting, FY 2027 (CMS and NCHS). Links open the PDF at the right page.

Covers default dominant or nondominant side for hemiplegia and monoplegia, and use and sequencing of G89 pain codes, including postoperative, chronic, and neoplasm-related pain.

Read Section I.C.6 (page 45)

Other codes under G60-G65

Polyneuropathies and other disorders of the peripheral nervous system (G60-G65)

G63 MS-DRGs

As the principal diagnosis, G63 groups to MS-DRG 073 or 074 (v44.0). Which one applies depends on procedures performed, secondary diagnoses (CC/MCC), and the patient's age and discharge status.

Related conditions

Grouped by AHRQ's Clinical Classifications Software Refined (CCSR), which sorts every diagnosis code into clinically meaningful categories.

G63 is in Polyneuropathies (NVS015), with 63 codes. Others in it:

  • A36.83 Diphtheritic polyneuritis
  • A50.43 Late congenital syphilitic polyneuropathy
  • A52.15 Late syphilitic neuropathy
  • B02.23 Postherpetic polyneuropathy
  • B26.84 Mumps polyneuropathy
  • B27.01 Gammaherpesviral mononucleosis with polyneuropathy
  • B27.11 Cytomegaloviral mononucleosis with polyneuropathy
  • B27.81 Other infectious mononucleosis with polyneuropathy

Medicare coverage articles listing G63

These 6 Medicare billing and coding articles list G63 as a diagnosis that supports medical necessity for the services they cover. From the CMS Medicare Coverage Database; check your own contractor's article before billing.

About the condition

Plain-language background from MedlinePlus (National Library of Medicine), not coding guidance.

Peripheral Nerve Disorders

Nerves are like wires that carry messages back and forth between your brain and your body. Your peripheral nerves branch off from your brain and spinal cord and connect to all parts of your body, including your muscles and organs. Peripheral nerves carry messages from your brain that control your movement, breathing, heartbeat, digestion, and more. They also carry messages from your body to your brain, so you can feel things, such as pain, heat, and cold.

Read more about peripheral nerve disorders on MedlinePlus

Code history

Valid since FY2016, when ICD-10-CM took effect on October 1, 2015. No changes since.

ICD-9-CM equivalent

Legacy crosswalk from the CMS General Equivalence Mappings (last updated 2018).

  • 357.4 Polyneuropathy in other diseases classified elsewhere (approximate)
ICD-9 to ICD-10 converter