What is ICD-10 code G14?

G14 is the ICD-10-CM diagnosis code for Postpolio syndrome. A late-onset condition affecting people who previously had polio, characterized by progressive muscle weakness, pain, and fatigue that develops years or decades after the initial infection. G14 is a billable code, meaning it can be reported on a claim as a primary or secondary diagnosis when supported by documentation. G14 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. G14 is a payment HCC under the CMS risk adjustment model. Under the CMS-HCC V28 risk adjustment model it maps to Spinal Cord Disorders/Injuries with a community, non-dual, aged base RAF weight of 0.478. It was not retained as a payment HCC under V24. V28 reached 100% phase-in for payment year 2026, replacing V24 which was used during the PY2024–PY2025 transition. HCC Buddy maintains the V28 and V24 mapping, RAF weight, and MEAT documentation criteria for G14 sourced directly from the CMS-HCC model files.

Yes. G14 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. G14 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 G14?

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. G14 is a payment HCC under V28 (Spinal Cord Disorders/Injuries) but was not retained as a payment HCC under V24. Both models can still appear in legacy data and in payer-specific lookback periods.

What should coders know when reporting G14?

Document the history of polio infection in the medical record This code is used only for late manifestations, not for acute polio Because G14 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.

G14: Postpolio syndrome — ICD-10 | Spinal Cord Disorders/Injuries

ICD-10-CM Code View

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Code lookupG14Effective periodFY2026 Apr Update (Apr 1-Sep 30)

FY 2026 Apr update / Diseases of the nervous system (G00-G99) / Systemic atrophies primarily affecting the central nervous system (G10-G14)

G14

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

Postpolio syndrome

A late-onset condition affecting people who previously had polio, characterized by progressive muscle weakness, pain, and fatigue that develops years or decades after the initial infection.

Buddy Insight

Postpolio syndrome affects polio survivors years to decades after initial infection, causing new progressive muscle weakness, fatigue, and pain.

CMS-HCC V28

Mapped

HCC 182

Spinal Cord Disorders/Injuries

RAF 0.478

CMS-HCC V24

N/A

—

Not risk-adjusted for this model/period.

Not mapped

ACA/HHS

N/A

—

Not risk-adjusted for this model/period.

Not mapped

ESRD/PACE

N/A

—

Not risk-adjusted for this model/period.

Not mapped

RXHCC

N/A

—

Not risk-adjusted for this model/period.

Not mapped

Code Book Path

Official

G1Systemic atrophies primarily affecting the central nervous system (G10-G14)

G14Postpolio syndrome

Inclusion Terms

Official

ICD-10-CM does not list inclusion terms for G14 in this effective period.

Excludes 2

Official

ICD-10-CM does not list Excludes 2 notes for G14 in this effective period.

Related Child Codes

Official

ICD-10-CM does not list child codes under G14 for this display context.

Includes

Official

postpolio myelitic syndrome

Excludes 1

Official

sequelae of poliomyelitis (B91)

Code First

Official

ICD-10-CM does not list Code First sequencing instructions for G14 in this effective period.

Use Additional

Official

ICD-10-CM does not list Use Additional Code instructions for G14 in this effective period.

Code Also

Official

ICD-10-CM does not list Code Also instructions for G14 in this effective period.

Buddy Documentation Tip

HCC Buddy guidance

Documented history of prior poliomyelitis infection

New onset of progressive muscle weakness, fatigue, or pain years after initial infection

Typical latency period of 15-40 years between acute polio and new symptoms documented

Neurological examination confirming new weakness in previously affected or unaffected muscles

MEAT Support

HCC Buddy guidance

Documented history of prior poliomyelitis infection

New onset of progressive muscle weakness, fatigue, or pain years after initial infection

Typical latency period of 15-40 years between acute polio and new symptoms documented

Neurological examination confirming new weakness in previously affected or unaffected muscles

Audit Caution

HCC Buddy guidance

Confusing postpolio syndrome (new progressive symptoms) with sequelae of poliomyelitis (stable residual deficits from the original infection)

Using B91 (sequelae of poliomyelitis) instead of G14 when new progressive symptoms are documented

Not documenting the history of prior polio infection which is essential to support this code

Coding postpolio syndrome for the acute polio infection itself — G14 is exclusively for late-onset progressive manifestations

Common Mistakes

HCC Buddy guidance

B91 — Sequelae of poliomyelitis: for residual paralysis or deformity from acute polio, not new progressive symptoms

G12.29 — Other motor neuron disease: postpolio syndrome is not classified as a primary motor neuron disease

M79.3 — Panniculitis, unspecified: sometimes confused due to fatigue and pain overlap

G71.11 — Myotonic muscular dystrophy: progressive weakness in adults but different 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 G14 an HCC code?

Yes. G14 maps to Spinal Cord Disorders/Injuries under the CMS-HCC V28 risk adjustment model.

HCC Category Mapping

V28HCC 182, Spinal Cord Disorders/Injuries

0.478

Each model's RAF is its CMS base weight for that model's standard population, so 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 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 G14 in the Code Book — tabular path, V28 RAF, and MEAT checklist →

MEAT Criteria for G14

For G14to 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 G14 during that encounter, not just copy-forwarded from a problem list.

Coder workflow notes

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What This Code Means

G14 is the ICD-10-CM diagnosis code for postpolio syndrome. A late-onset condition affecting people who previously had polio, characterized by progressive muscle weakness, pain, and fatigue that develops years or decades after the initial infection. G14 sits in the ICD-10-CM chapter for diseases of the nervous system (g00-g99), within the section covering systemic atrophies primarily affecting the central nervous system (g10-g14).

Under the CMS-HCC V28 risk adjustment model, G14 maps to Spinal Cord Disorders/Injuries (HCC 182) with a community, non-dual, aged base RAF weight of 0.478. G14 was not retained as a payment HCC under the older V24 model, so V28 introduced or recategorized it during the 2024–2026 phase-in. 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 history of polio infection in the medical record. Because G14 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 G14 sourced directly from the CMS-HCC risk adjustment model files and the CMS ICD-10-CM code set.

Coding Tips

•Document the history of polio infection in the medical record
•This code is used only for late manifestations, not for acute polio

Clinical Significance

Postpolio syndrome affects polio survivors years to decades after initial infection, causing new progressive muscle weakness, fatigue, and pain. With an estimated 300,000-400,000 postpolio survivors in the United States, this condition drives significant rehabilitation and pain management utilization and requires differentiation from other causes of weakness in aging patients.

Documentation Requirements

✓Documented history of prior poliomyelitis infection
✓New onset of progressive muscle weakness, fatigue, or pain years after initial infection
✓Typical latency period of 15-40 years between acute polio and new symptoms documented
✓Neurological examination confirming new weakness in previously affected or unaffected muscles
✓Exclusion of other causes of progressive weakness
✓Electromyography findings if performed showing chronic denervation with reinnervation

Includes

postpolio myelitic syndrome

Excludes 1, Do NOT code together

sequelae of poliomyelitis (B91)

Commonly Confused Codes

•B91: Sequelae of poliomyelitis: for residual paralysis or deformity from acute polio, not new progressive symptoms
•G12.29: Other motor neuron disease: postpolio syndrome is not classified as a primary motor neuron disease
•M79.3: Panniculitis, unspecified: sometimes confused due to fatigue and pain overlap
•G71.11: Myotonic muscular dystrophy: progressive weakness in adults but different etiology

Code Hierarchy

└G14Postpolio syndrome

G14 ICD-10-CM Code: Postpolio syndrome

HCC Buddy Code Card

G14

Is G14 an HCC code?

HCC Category Mapping

MEAT Criteria for G14

Get the V28 RAF + MEAT cheat sheet

What This Code Means

Coding Tips

Clinical Significance

Documentation Requirements

Includes

Excludes 1, Do NOT code together

Commonly Confused Codes

Code Hierarchy

Work G14 in HCC Buddy