What is ICD-10 code G62.2?

G62.2 is the ICD-10-CM diagnosis code for Polyneuropathy due to other toxic agents. Nerve damage affecting multiple nerves caused by exposure to toxic substances such as heavy metals, chemicals, or other poisonous agents. It belongs to the ICD-10-CM chapter for diseases of the nervous system (g00-g99). G62.2 is a billable code, meaning it can be reported on a claim as a primary or secondary diagnosis when supported by documentation. G62.2 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. G62.2 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. G62.2 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 G62.2?

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. G62.2 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 G62.2?

Identify and document the specific toxic agent responsible for the polyneuropathy Use an additional code from the T51-T65 range to specify the toxic substance exposure Because G62.2 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.

G62.2: Polyneuropathy due to other toxic agents —

ICD-10-CM Code View

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Digital ICD-10 code-book layout with official code detail, always-visible risk models, Code Trumping, and Buddy coding guidance.

Code lookupG62.2Effective 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)

G62.2

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

Polyneuropathy due to other toxic agents

Nerve damage affecting multiple nerves caused by exposure to toxic substances such as heavy metals, chemicals, or other poisonous agents.

Buddy Insight

Polyneuropathy due to other toxic agents captures nerve damage from environmental or occupational toxin exposure such as heavy metals, pesticides, or industrial chemicals.

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

G62Other and unspecified polyneuropathies

G62.2Polyneuropathy due to other toxic agents

Inclusion Terms

Official

ICD-10-CM does not list inclusion terms for G62.2 in this effective period.

Excludes 2

Official

ICD-10-CM does not list Excludes 2 notes for G62.2 in this effective period.

Related Child Codes

Official

G62.0Drug-induced polyneuropathy

G62.1Alcoholic polyneuropathy

G62.8Other specified polyneuropathies

G62.9Polyneuropathy, unspecified

Includes

Official

ICD-10-CM does not list Includes notes for G62.2 in this effective period.

Excludes 1

Official

ICD-10-CM does not list Excludes 1 notes for G62.2 in this effective period.

Code First

Official

(T51-T65) to identify toxic agent

Use Additional

Official

ICD-10-CM does not list Use Additional Code instructions for G62.2 in this effective period.

Code Also

Official

ICD-10-CM does not list Code Also instructions for G62.2 in this effective period.

Buddy Documentation Tip

HCC Buddy guidance

Identification of the specific toxic agent responsible for the polyneuropathy

Evidence of toxic exposure: occupational history, environmental assessment, toxicology testing

Clinical findings supporting polyneuropathy: weakness, numbness, nerve conduction study abnormalities

Additional code from T51-T65 range identifying the specific toxic substance

MEAT Support

HCC Buddy guidance

Identification of the specific toxic agent responsible for the polyneuropathy

Evidence of toxic exposure: occupational history, environmental assessment, toxicology testing

Clinical findings supporting polyneuropathy: weakness, numbness, nerve conduction study abnormalities

Additional code from T51-T65 range identifying the specific toxic substance

Audit Caution

HCC Buddy guidance

Forgetting to assign the additional toxic substance identification code from T51-T65

Using the drug-induced polyneuropathy code (G62.0) when the toxin is environmental rather than pharmaceutical

Not documenting the specific toxin, which leaves auditors unable to verify the code selection

Missing the seventh character on the external cause code for initial, subsequent, or sequela encounter

Common Mistakes

HCC Buddy guidance

G62.0 — Drug-induced polyneuropathy is for medication-related nerve damage, not environmental/occupational toxins

G62.1 — Alcoholic polyneuropathy is specific to alcohol toxicity

G62.81 — Critical illness polyneuropathy develops in the context of ICU-level critical illness, not toxic exposure

G62.9 — Polyneuropathy, unspecified should not be used when a toxic cause is documented

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 G62.2 an HCC code?

Yes. G62.2 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 G62.2

For G62.2to 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 G62.2 during that encounter, not just copy-forwarded from a problem list.

What This Code Means

G62.2 is the ICD-10-CM diagnosis code for polyneuropathy due to other toxic agents. Nerve damage affecting multiple nerves caused by exposure to toxic substances such as heavy metals, chemicals, or other poisonous agents. G62.2 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, G62.2 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.

Identify and document the specific toxic agent responsible for the polyneuropathy. Because G62.2 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 G62.2 sourced directly from the CMS-HCC risk adjustment model files and the CMS ICD-10-CM code set.

Coding Tips

•Identify and document the specific toxic agent responsible for the polyneuropathy
•Use an additional code from the T51-T65 range to specify the toxic substance exposure

Clinical Significance

Polyneuropathy due to other toxic agents captures nerve damage from environmental or occupational toxin exposure such as heavy metals, pesticides, or industrial chemicals. It reflects both the neurological impairment and the underlying toxic exposure requiring monitoring and remediation. Accurate coding is important for tracking occupational health conditions and ensuring appropriate risk adjustment.

Documentation Requirements

✓Identification of the specific toxic agent responsible for the polyneuropathy
✓Evidence of toxic exposure: occupational history, environmental assessment, toxicology testing
✓Clinical findings supporting polyneuropathy: weakness, numbness, nerve conduction study abnormalities
✓Additional code from T51-T65 range identifying the specific toxic substance
✓Temporal relationship between toxic exposure and symptom onset
✓Provider's explicit causal statement linking the toxin to the polyneuropathy

Code First

(T51-T65) to identify toxic agent

Commonly Confused Codes

•G62.0: Drug-induced polyneuropathy is for medication-related nerve damage, not environmental/occupational toxins
•G62.1: Alcoholic polyneuropathy is specific to alcohol toxicity
•G62.81: Critical illness polyneuropathy develops in the context of ICU-level critical illness, not toxic exposure
•G62.9: Polyneuropathy, unspecified should not be used when a toxic cause is documented