What is ICD-10 code G62.81?

G62.81 is the ICD-10-CM diagnosis code for Critical illness polyneuropathy. Nerve damage affecting multiple nerves that develops as a complication of critical illness, often occurring in patients who have been severely ill or in intensive care. G62.81 is a billable code, meaning it can be reported on a claim as a primary or secondary diagnosis when supported by documentation. G62.81 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. G62.81 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. G62.81 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 G62.81?

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. G62.81 was a payment HCC under V24 (Myasthenia Gravis/Myoneural Disorders and Guillain-Barre Syndrome/Inflammatory and Toxic Neuropathy) 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 G62.81?

Document the underlying critical illness condition that led to the polyneuropathy development This code requires evidence of acute illness context; ensure clinical documentation supports critical illness status Because G62.81 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.

G62.81: Critical illness polyneuropathy — ICD-10 | Myasthenia Gravis/Myoneural Disorders

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 lookupG62.81Effective 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)

G62.81

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

Critical illness polyneuropathy

Nerve damage affecting multiple nerves that develops as a complication of critical illness, often occurring in patients who have been severely ill or in intensive care.

Buddy Insight

Critical illness polyneuropathy develops as a complication of severe illness requiring intensive care, often seen in sepsis or multi-organ failure patients.

CMS-HCC V28

Not risk-adjusted for this model/period.

RAF 0

CMS-HCC V24

Mapped

HCC 75

Myasthenia Gravis/Myoneural D...

RAF 0.472

ACA/HHS

Not risk-adjusted for this model/period.

RAF 0

ESRD/PACE

Mapped

HCC 75

Myasthenia Gravis/Myoneural D...

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

G62.8Other specified polyneuropathies

G62.81Critical illness polyneuropathy

Inclusion Terms

Official

Acute motor neuropathy

Excludes 2

Official

ICD-10-CM does not list Excludes 2 notes for G62.81 in this effective period.

Related Child Codes

Official

G62.82Radiation-induced polyneuropathy

G62.89Other specified polyneuropathies

Includes

Official

ICD-10-CM does not list Includes notes for G62.81 in this effective period.

Excludes 1

Official

ICD-10-CM does not list Excludes 1 notes for G62.81 in this effective period.

Code First

Official

ICD-10-CM does not list Code First sequencing instructions for G62.81 in this effective period.

Use Additional

Official

ICD-10-CM does not list Use Additional Code instructions for G62.81 in this effective period.

Code Also

Official

ICD-10-CM does not list Code Also instructions for G62.81 in this effective period.

Buddy Documentation Tip

HCC Buddy guidance

Documentation of critical illness or ICU admission precipitating the polyneuropathy

Clinical findings: weakness, difficulty weaning from ventilator, reduced deep tendon reflexes

Nerve conduction studies showing axonal polyneuropathy pattern

Temporal relationship between critical illness and polyneuropathy development

MEAT Support

HCC Buddy guidance

Documentation of critical illness or ICU admission precipitating the polyneuropathy

Clinical findings: weakness, difficulty weaning from ventilator, reduced deep tendon reflexes

Nerve conduction studies showing axonal polyneuropathy pattern

Temporal relationship between critical illness and polyneuropathy development

Audit Caution

HCC Buddy guidance

Confusing critical illness polyneuropathy with critical illness myopathy — they are distinct conditions requiring different codes, though they can coexist

Failing to also code the underlying critical illness condition that precipitated the polyneuropathy

Using ICU-acquired weakness as the diagnosis instead of the specific polyneuropathy code when nerve conduction studies confirm the diagnosis

Not capturing this condition when it develops during a hospital stay and is first noted in rehabilitation records

Common Mistakes

HCC Buddy guidance

G61.0 — Guillain-Barre syndrome is autoimmune in origin, not related to critical illness; presentations can overlap

G72.81 — Critical illness myopathy affects muscles directly rather than nerves; both may coexist

G62.89 — Other specified polyneuropathy is less specific and should not be used when critical illness polyneuropathy is documented

M62.81 — Muscle weakness is a symptom code; use G62.81 for the underlying neuropathic condition

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 G62.81 an HCC code?

Yes. G62.81 maps to Myasthenia Gravis/Myoneural Disorders and Guillain-Barre Syndrome/Inflammatory and Toxic Neuropathy under the V24 model but is not retained in V28.

HCC Category Mapping

V24HCC 75, Myasthenia Gravis/Myoneural Disorders and Guillain-Barre Syndrome/Inflammatory and Toxic Neuropathy

0.472

ESRDHCC 75, Myasthenia Gravis/Myoneural Disorders and Guillain-Barre Syndrome/Inflammatory and Toxic Neuropathy

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.

Work G62.81 in the Code Book — tabular path, V28 RAF, and MEAT checklist →

MEAT Criteria for G62.81

For G62.81to 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 G62.81 during that encounter, not just copy-forwarded from a problem list.

Coder workflow notes

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What This Code Means

G62.81 is the ICD-10-CM diagnosis code for critical illness polyneuropathy. Nerve damage affecting multiple nerves that develops as a complication of critical illness, often occurring in patients who have been severely ill or in intensive care. G62.81 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, G62.81 maps to Myasthenia Gravis/Myoneural Disorders and Guillain-Barre Syndrome/Inflammatory and Toxic Neuropathy (HCC 75) with a community, non-dual, aged base RAF weight of 0.472. 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.

Document the underlying critical illness condition that led to the polyneuropathy development. Because G62.81 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 G62.81 sourced directly from the CMS-HCC risk adjustment model files and the CMS ICD-10-CM code set.

Coding Tips

•Document the underlying critical illness condition that led to the polyneuropathy development
•This code requires evidence of acute illness context; ensure clinical documentation supports critical illness status

Clinical Significance

Critical illness polyneuropathy develops as a complication of severe illness requiring intensive care, often seen in sepsis or multi-organ failure patients. It significantly impacts patient recovery, prolonging ICU stays and rehabilitation needs. Accurate capture reflects the heightened complexity and resource utilization of these critically ill patients.

Documentation Requirements

✓Documentation of critical illness or ICU admission precipitating the polyneuropathy
✓Clinical findings: weakness, difficulty weaning from ventilator, reduced deep tendon reflexes
✓Nerve conduction studies showing axonal polyneuropathy pattern
✓Temporal relationship between critical illness and polyneuropathy development
✓Underlying critical illness diagnosis documented (sepsis, multi-organ failure, etc.)
✓Provider's explicit diagnosis of critical illness polyneuropathy

Commonly Confused Codes

•G61.0: Guillain-Barre syndrome is autoimmune in origin, not related to critical illness; presentations can overlap
•G72.81: Critical illness myopathy affects muscles directly rather than nerves; both may coexist
•G62.89: Other specified polyneuropathy is less specific and should not be used when critical illness polyneuropathy is documented
•M62.81: Muscle weakness is a symptom code; use G62.81 for the underlying neuropathic condition