What is ICD-10 code G50.8?

G50.8 is the ICD-10-CM diagnosis code for Other disorders of trigeminal nerve. Other disorders affecting the trigeminal nerve not classified elsewhere, such as nerve compression, inflammation, or dysfunction. It belongs to the ICD-10-CM chapter for diseases of the nervous system (g00-g99). G50.8 is a billable code, meaning it can be reported on a claim as a primary or secondary diagnosis when supported by documentation. G50.8 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. G50.8 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. G50.8 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.

Which HCC does G50.8 map to under V28?

G50.8 has no payable CMS-HCC V28 mapping in the final FY2026 CMS file.

What RAF reference is published for G50.8?

G50.8 has no V28 reference coefficient because the final FY2026 source verifies no payable V28 mapping.

What is the V28 vs V24 difference for G50.8?

G50.8 has verified no payable V28 mapping in the final FY2026 source. Select a historical effective period before making any V24 comparison.

What documentation supports G50.8?

Use this code only when the trigeminal nerve disorder cannot be assigned to a more specific code (G50.0, G50.1, or G50.9) Document the specific pathology affecting the trigeminal nerve G50.8 is not a CMS-HCC V28 payment code in the verified current source, so MEAT is not the payment hook. Documentation still has to support the diagnosis if you report it.

2026 ICD-10-CM G50.8: Other disorders of trigeminal nerve

G50.8 is not a CMS-HCC payment code. MEAT criteria · RAF Calculator · HCC coding software

ICD-10-CM Code View

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Code lookupG50.8Effective periodFY2026 Apr Update (Apr 1-Sep 30)

FY 2026 Apr update / Diseases of the nervous system (G00-G99) / Nerve, nerve root and plexus disorders (G50-G59)

G50.8

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

Other disorders of trigeminal nerve

Other disorders affecting the trigeminal nerve not classified elsewhere, such as nerve compression, inflammation, or dysfunction.

Buddy Insight

CMS-HCC V28

N/A

—

Not risk-adjusted for this model/period.

Not mapped

CMS-HCC V24

Historical

Not used for standard CY2026 Medicare Advantage payment. Select a historical period to review V24.

Not used for CY2026 payment

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

Mapped

HCC 168

Trigeminal and Postherpetic N...

Code-level coefficient reference

Code Book Path

Official

G50Disorders of trigeminal nerve

G50.8Other disorders of trigeminal nerve

Inclusion Terms

Official

ICD-10-CM does not list inclusion terms for G50.8 in this effective period.

Excludes 2

Official

ICD-10-CM does not list Excludes 2 notes for G50.8 in this effective period.

Related Child Codes

Official

G50.0Trigeminal neuralgia

G50.1Atypical facial pain

G50.9Disorder of trigeminal nerve, unspecified

Includes

Official

disorders of 5th cranial nerve

Excludes 1

Official

ICD-10-CM does not list Excludes 1 notes for G50.8 in this effective period.

Code First

Official

ICD-10-CM does not list Code First sequencing instructions for G50.8 in this effective period.

Use Additional

Official

ICD-10-CM does not list Use Additional Code instructions for G50.8 in this effective period.

Code Also

Official

ICD-10-CM does not list Code Also instructions for G50.8 in this effective period.

Buddy Documentation Tip

HCC Buddy guidance

Specific trigeminal nerve disorder identified (neuropathy, post-traumatic injury, compression)

Documentation of which trigeminal branch(es) is affected (V1, V2, V3)

Clinical findings: sensory deficit, numbness, tingling, or weakness in trigeminal distribution

Underlying cause identified if applicable (trauma, surgery, tumor, connective tissue disease)

MEAT Support

HCC Buddy guidance

Specific trigeminal nerve disorder identified (neuropathy, post-traumatic injury, compression)

Documentation of which trigeminal branch(es) is affected (V1, V2, V3)

Clinical findings: sensory deficit, numbness, tingling, or weakness in trigeminal distribution

Underlying cause identified if applicable (trauma, surgery, tumor, connective tissue disease)

Audit Caution

HCC Buddy guidance

Using G50.8 when trigeminal neuralgia (G50.0) is the correct diagnosis — neuralgia has its own code

Coding 'other' without documenting what the specific disorder is — 'other' requires an identified condition

Defaulting to unspecified (G50.9) when enough detail exists to code as G50.0, G50.1, or G50.8

Not capturing the underlying cause of trigeminal neuropathy when one is identified

Common Mistakes

HCC Buddy guidance

G50.0 (Trigeminal neuralgia) — paroxysmal pain syndrome; G50.8 is for other identified pathology

G50.1 (Atypical facial pain) — continuous poorly localized pain; different from specific nerve pathology

G50.9 (Disorder of trigeminal nerve, unspecified) — use G50.8 when a specific disorder is identified but not neuralgia or atypical pain

S04.30-S04.39 (Injury of trigeminal nerve) — acute traumatic injury; use G50.8 for chronic post-traumatic neuropathy

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 G50.8 an HCC code?

G50.8 is not in the CMS-HCC V28 or V24 community payment model. G50.8 has a separate mapping under the Part D RxHCC model (HCC 168 (Trigeminal and Postherpetic Neuralgia)); the applicable result needs member context.

Code: G50.8
Description: Other disorders of trigeminal nerve
HCC (V28): No CMS-HCC V28 mapping
RAF reference coefficient: —
Billable: Yes
Payment year: 2026

HCC Category Mapping

RxHCCHCC 168, Trigeminal and Postherpetic Neuralgia

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 G50.8 in the Code Book — tabular path, V28 RAF reference, and MEAT checklist →

MEAT Criteria for G50.8

For G50.8 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 G50.8 during that encounter, not just copy-forwarded from a problem list.

Coder workflow notes

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What This Code Means

G50.8 is the ICD-10-CM diagnosis code for other disorders of trigeminal nerve. Other disorders affecting the trigeminal nerve not classified elsewhere, such as nerve compression, inflammation, or dysfunction. G50.8 sits in the ICD-10-CM chapter for diseases of the nervous system (g00-g99), within the section covering nerve, nerve root and plexus disorders (g50-g59).

G50.8 has no mapping under the CMS-HCC V28 or V24 community payment models. G50.8 has a separate mapping under the Part D RxHCC model (HCC 168 (Trigeminal and Postherpetic Neuralgia)); the applicable result needs member context. Do not assign V28 risk adjustment value from this page; verify the applicable model and payment year before using this code for risk adjustment.

Use this code only when the trigeminal nerve disorder cannot be assigned to a more specific code (G50.0, G50.1, or G50.9).

HCC Buddy maintains structured V28 and V24 mapping, source-labeled coefficient references, and MEAT documentation criteria for G50.8 sourced directly from the CMS-HCC risk adjustment model files and the CMS ICD-10-CM code set.

Coding Tips

•Use this code only when the trigeminal nerve disorder cannot be assigned to a more specific code (G50.0, G50.1, or G50.9)
•Document the specific pathology affecting the trigeminal nerve

Clinical Significance

Other disorders of the trigeminal nerve encompasses specific pathologies of cranial nerve V that are not trigeminal neuralgia or atypical facial pain, such as trigeminal neuropathy, post-traumatic trigeminal nerve injury, or trigeminal nerve compression syndromes. Accurate use of this code requires documentation of a specific identified disorder rather than simply an unspecified trigeminal problem. This code is important for capturing conditions that may require neurosurgical referral or specialized nerve imaging.

Documentation Requirements

✓Specific trigeminal nerve disorder identified (neuropathy, post-traumatic injury, compression)
✓Documentation of which trigeminal branch(es) is affected (V1, V2, V3)
✓Clinical findings: sensory deficit, numbness, tingling, or weakness in trigeminal distribution
✓Underlying cause identified if applicable (trauma, surgery, tumor, connective tissue disease)
✓Neurological examination documenting trigeminal nerve function
✓Imaging results if structural cause is suspected
✓Distinction from trigeminal neuralgia (G50.0) and atypical facial pain (G50.1)

Commonly Confused Codes

•G50.0 (Trigeminal neuralgia): paroxysmal pain syndrome; G50.8 is for other identified pathology
•G50.1 (Atypical facial pain): continuous poorly localized pain; different from specific nerve pathology
•G50.9 (Disorder of trigeminal nerve, unspecified): use G50.8 when a specific disorder is identified but not neuralgia or atypical pain
•S04.30-S04.39 (Injury of trigeminal nerve): acute traumatic injury; use G50.8 for chronic post-traumatic neuropathy
•B02.22 (Postherpetic trigeminal neuralgia): has its own specific code when etiology is herpes zoster