What is ICD-10 code G63?

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 is a billable code, meaning it can be reported on a claim as a primary or secondary diagnosis when supported by documentation. G63 is part of the FY2026 ICD-10-CM code set published by the CMS National Center for Health Statistics and used on Medicare, Medicaid, and commercial claims in the United States.

Yes. G63 is a billable ICD-10-CM code that can be reported on professional and institutional claims as a primary or secondary diagnosis when the provider documentation supports the specific condition described. Billable codes in ICD-10-CM are coded to the highest level of specificity available for the documented diagnosis. G63 is current for fiscal year 2026 and remains in the active CMS ICD-10-CM code set published by the National Center for Health Statistics.

What is the V28 vs V24 difference for G63?

CMS phased in the V28 risk adjustment model over payment years 2024 (33%), 2025 (67%), and 2026 (100%), replacing V24. V28 consolidates HCC categories, removes some lower-acuity conditions, and recalibrates RAF weights across the entire model. G63 was a payment HCC under V24 (Myasthenia Gravis/Myoneural Conditions and Guillain-Barre Syndrome) but the V28 recalibration removed it from the risk adjustment model. Both models can still appear in legacy data and in payer-specific lookback periods.

What should coders know when reporting G63?

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 Because G63 maps to a payment HCC, the documentation must also satisfy MEAT criteria (Monitor, Evaluate, Assess, or Treat) for the encounter to count toward the patient's risk adjustment score.

G63 ICD-10 Code: Polyneuropathy in diseases

ICD-10-CM Code View

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Code lookupG63Effective periodFY2026 Apr Update (Apr 1-Sep 30)

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 Insight

CMS-HCC V28

Not risk-adjusted for this model/period.

RAF 0

CMS-HCC V24

Mapped

HCC 75

Myasthenia Gravis/Myoneural C...

RAF 0.425

ACA/HHS

Not risk-adjusted for this model/period.

RAF 0

ESRD/PACE

Mapped

HCC 75

Myasthenia Gravis/Myoneural C...

RAF 0.0

RXHCC

Mapped

HCC 158

Guillain-Barre Syndrome and O...

RAF 0.0

Code Trumping

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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

Last updated: FY2026 ICD-10-CM Apr update, Apr 1, 2026 through Sep 30, 2026. CMS-HCC V28 is 100% phased in for payment year 2026.

Is G63 an HCC code?

Yes. G63 maps to Myasthenia Gravis/Myoneural Conditions and Guillain-Barre Syndrome under the V24 model but is not retained in V28.

HCC Category Mapping

V24HCC 75 — Myasthenia Gravis/Myoneural Conditions and Guillain-Barre Syndrome

0.425

ESRDHCC 75 — Myasthenia Gravis/Myoneural Conditions and Guillain-Barre Syndrome

0.000

RxHCCHCC 158 — Guillain-Barre Syndrome and Other Polyneuropathies

0.000

RAF weights shown are the community, non-dual, aged base weights from the CMS risk adjustment model file. Actual per-patient RAF contribution depends on member segment, interactions, and the model year used by the payer. V28 is the CMS-HCC model phased in over payment years 2024–2026; V24 remains in use during the transition and for historical data.

MEAT Criteria for G63

For G63to 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.

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).

Under the older CMS-HCC V24 model, G63 maps to Myasthenia Gravis/Myoneural Conditions and Guillain-Barre Syndrome (HCC 75) with a community, non-dual, aged base RAF weight of 0.425. V28 is the CMS-HCC risk adjustment model that reached 100% phase-in for payment year 2026, replacing V24 which was used during the PY2024–PY2025 transition.

This code requires a secondary diagnosis code for the underlying disease causing the polyneuropathy. Because G63 maps to a payment HCC, the provider's documentation must satisfy MEAT criteria (Monitor, Evaluate, Assess, or Treat) for the encounter to count toward the patient's Medicare Advantage risk adjustment score. When documentation is ambiguous, coders should issue a provider query rather than assume the highest-specificity variant.

HCC Buddy maintains structured V28 and V24 mapping, RAF weights, 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

underlying disease, such as:
amyloidosis (E85.-)
endocrine disease, except diabetes (E00-E07, E15-E16, E20-E34)
metabolic diseases (E70-E88)
neoplasm (C00-D49)
nutritional deficiency (E40-E64)

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

HCC Buddy Code Card

G63

Is G63 an HCC code?

HCC Category Mapping

MEAT Criteria for G63

What This Code Means

Coding Tips

Clinical Significance

Documentation Requirements

Excludes 1 — Do NOT code together

Code First

Commonly Confused Codes

Code Hierarchy

More on G63

Referenced in blog posts

Open G63 in the Interactive Encoder