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G63 ICD-10-CM Code: Polyneuropathy in diseases classified elsewhere

G63 is not a CMS-HCC payment code. MEAT criteria · RAF Calculator · HCC Buddy coding tools

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FY 2026 Apr update / Diseases of the nervous system (G00-G99) / Polyneuropathies and other disorders of the peripheral nervous system (G60-G65)

G63

Billable / SpecificICD-10-CMOfficial ICD-10-CMCodebook guidance

Polyneuropathy in diseases classified elsewhere

Nerve damage affecting multiple nerves that occurs as a secondary condition in patients with other classified diseases such as diabetes, infections, or metabolic disorders.

Buddy the Bee presenting code insight

Buddy Insight

Polyneuropathy in diseases classified elsewhere is a manifestation code that indicates nerve damage secondary to another systemic disease, most commonly diabetes, infections, or connective tissue disorders.

CMS-HCC V28

N/A

—

Not mapped

CMS-HCC V24

N/A

—

Not mapped

ACA/HHS

HCC 115

Code-level coefficient reference

ESRD/PACE

HCC 75

Code-level coefficient reference

RXHCC

HCC 158

Code-level coefficient reference

Code Book Path

Official
G6Polyneuropathies and other disorders of the peripheral nervous system (G60-G65)
G63Polyneuropathy in diseases classified elsewhere

Inclusion Terms

Official

ICD-10-CM does not list inclusion terms for G63 in this effective period.

Excludes 2

Official

ICD-10-CM does not list Excludes 2 notes for G63 in this effective period.

Related Child Codes

Official

ICD-10-CM does not list child codes under G63 for this display context.

Includes

Official

ICD-10-CM does not list Includes notes for G63 in this effective period.

Excludes 1

Official
  • 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)

Code First

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

Use Additional

Official

ICD-10-CM does not list Use Additional Code instructions for G63 in this effective period.

Code Also

Official

ICD-10-CM does not list Code Also instructions for G63 in this effective period.

Buddy Documentation Tip

HCC Buddy guidance
The underlying causative disease must be documented and coded first (etiology code sequenced before G63)
Clinical evidence of polyneuropathy: symptoms, exam findings, electrodiagnostic studies
Provider's explicit statement linking the polyneuropathy to the underlying disease
Functional impact of the polyneuropathy on the patient

MEAT Support

HCC Buddy guidance
The underlying causative disease must be documented and coded first (etiology code sequenced before G63)
Clinical evidence of polyneuropathy: symptoms, exam findings, electrodiagnostic studies
Provider's explicit statement linking the polyneuropathy to the underlying disease
Functional impact of the polyneuropathy on the patient

Audit Caution

HCC Buddy guidance
Using G63 as a standalone code without the required underlying etiology code sequenced first
Using G63 in addition to a diabetes combination code (E11.42) that already captures the polyneuropathy — this is redundant
Sequencing G63 before the underlying disease code — the etiology code must always come first
Not recognizing that many underlying disease codes have built-in combination codes that make G63 unnecessary

Common Mistakes

HCC Buddy guidance
E11.42 — Type 2 diabetes mellitus with diabetic polyneuropathy is a combination code that does not require G63 as an additional code
G62.9 — Polyneuropathy, unspecified is for polyneuropathy without a known underlying classified disease
G61.89 — Other inflammatory polyneuropathies is for primary inflammatory neuropathies, not neuropathies secondary to other diseases
G63 is a manifestation code — do NOT use as a standalone code; always pair with the underlying etiology

Current with CMS: FY2026 ICD-10-CM Apr 1 update (effective Apr 1 – Sep 30, 2026) · CMS-HCC V28, 100% phased in for payment year 2026. FY2027 code set already staged for October 1, 2026. How HCC Buddy stays current →

Is G63 an HCC code?

G63 is not in the CMS-HCC V28 or V24 community payment model, but it does map to Myasthenia Gravis/Myoneural Disorders and Guillain-Barre Syndrome/Inflammatory and Toxic Neuropathy under the CMS-HCC ESRD model and Inflammatory and Toxic Neuropathy under the Part D RxHCC model.

Code
G63
Description
Polyneuropathy in diseases classified elsewhere
HCC (V28)
No CMS-HCC V28 mapping
RAF reference coefficient
—
Billable
Yes
Payment year
2026

HCC Category Mapping

ESRDHCC 75, Myasthenia Gravis/Myoneural Disorders and Guillain-Barre Syndrome/Inflammatory and Toxic Neuropathy
Not separately weighted
RxHCCHCC 158, Inflammatory and Toxic Neuropathy
Not separately weighted

These are source-labeled model coefficients, not member totals. A category may still be removed by hierarchy or model cleanup rules. Weights are not directly comparable across models: CMS-HCC V28 and V24 use Community, Non-Dual, Aged; ESRD uses the dialysis continuing-enrollee model; RxHCC is the Part D continuing-enrollee, non-low-income, aged weight (a larger scale than CMS-HCC). ACA/HHS has no single weight — it varies by metal level. Actual per-patient RAF contribution depends on member context, hierarchy and cleanup rules, interactions, and the model year used by the payer. V28 is the CMS-HCC model phased in over payment years 2024–2026; V24 remains available for historical review.

Work G63 in the Code Book — tabular path, V28 RAF reference, and MEAT checklist →

MEAT Criteria for G63

For G63 to count as a valid HCC diagnosis in a given encounter, the provider's documentation must show MEAT: Monitor, Evaluate, Assess, or Treat. A diagnosis from a prior year does not carry forward automatically, it has to be re-documented and supported each calendar year.

  • MMonitor: signs, symptoms, disease progression, or lab trending documented in the note
  • EEvaluate: test results, medication response, or physical findings reviewed by the provider
  • AAssess: explicit mention in the assessment or plan with acknowledgment of status
  • TTreat: medication, referral, procedure, therapy, or counseling tied to the diagnosis

Only one of M/E/A/T is required to support the code, but the documentation must be specific enough to show that the provider actually addressed G63 during that encounter, not just copy-forwarded from a problem list.

Coder workflow notes

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What This Code Means

G63 is the ICD-10-CM diagnosis code for polyneuropathy in diseases classified elsewhere. Nerve damage affecting multiple nerves that occurs as a secondary condition in patients with other classified diseases such as diabetes, infections, or metabolic disorders. G63 sits in the ICD-10-CM chapter for diseases of the nervous system (g00-g99), within the section covering polyneuropathies and other disorders of the peripheral nervous system (g60-g65).

G63 is a billable ICD-10-CM code, but the current payload does not show a mapping under the CMS-HCC V28, V24, ESRD, or RxHCC models. Do not assign risk adjustment value from this page when no source-backed mapping is shown; verify the applicable model and payment year.

This code requires a secondary diagnosis code for the underlying disease causing the polyneuropathy.

HCC Buddy maintains structured V28 and V24 mapping, source-labeled coefficient references, and MEAT documentation criteria for G63 sourced directly from the CMS-HCC risk adjustment model files and the CMS ICD-10-CM code set.

Coding Tips

  • •This code requires a secondary diagnosis code for the underlying disease causing the polyneuropathy
  • •Always code the primary disease first, then use G63 to indicate polyneuropathy as a manifestation

Clinical Significance

Polyneuropathy in diseases classified elsewhere is a manifestation code that indicates nerve damage secondary to another systemic disease, most commonly diabetes, infections, or connective tissue disorders. It adds important clinical context showing that the underlying disease has produced neurological complications, reflecting greater disease severity and complexity.

Documentation Requirements

  • ✓The underlying causative disease must be documented and coded first (etiology code sequenced before G63)
  • ✓Clinical evidence of polyneuropathy: symptoms, exam findings, electrodiagnostic studies
  • ✓Provider's explicit statement linking the polyneuropathy to the underlying disease
  • ✓Functional impact of the polyneuropathy on the patient
  • ✓Current treatment and management plan for both the underlying disease and the neuropathy

Excludes 1, Do NOT code together

  • 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

Commonly Confused Codes

  • •E11.42: Type 2 diabetes mellitus with diabetic polyneuropathy is a combination code that does not require G63 as an additional code
  • •G62.9: Polyneuropathy, unspecified is for polyneuropathy without a known underlying classified disease
  • •G61.89: Other inflammatory polyneuropathies is for primary inflammatory neuropathies, not neuropathies secondary to other diseases
  • •G63 is a manifestation code: do NOT use as a standalone code; always pair with the underlying etiology

Code Hierarchy

└G63Polyneuropathy in diseases classified elsewhere
└G63Polyneuropathy in diseases classified elsewhere

More on G63

Referenced in blog posts

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