2027 ICD-10-CM Diagnosis Code G50.0Trigeminal neuralgia
ICD-10-CM Codes›G00–G99›G50-G59›G50
- Billable — Valid for Submission
- Chronic Condition
G50.0 is a billable ICD-10-CM diagnosis code for trigeminal neuralgia. It is valid on HIPAA claims for fiscal year 2027 (October 1, 2026 through September 30, 2027) and groups to MS-DRG 73 through 74. Coders also document this condition as fifth cranial nerve finding. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Nerve and nerve root disorders.
G50.0 does not risk-adjust for Medicare Advantage under the CMS-HCC V28 model. It still risk-adjusts in the RxHCC Part D (V08) category 168 for payment year 2027.
Code Identity
Code Classification
Medicare Risk Adjustment (HCC)Billing
G50.0 does not risk-adjust for Medicare Advantage under the CMS-HCC V28 model, but it maps to payment categories in the other CMS models shown below.
Source: CMS Payment Year 2027 risk adjustment mappings and model software. Weights are relative factors, not dollar amounts; a beneficiary's total RAF also includes demographics and interactions. Browse all CMS-HCC categories.
Approximate SynonymsGuidance
Alternate terms and clinical phrases that map to this code.
- Fifth cranial nerve finding
- Idiopathic trigeminal neuralgia
- Idiopathic trigeminal neuropathy
- Left trigeminal neuralgia
- Nasociliary neuralgia
- Right trigeminal neuralgia
- Secondary trigeminal neuralgia
- Trigeminal neuralgia
Instructional NotesGuidance
Instructions from the official ICD-10-CM Tabular List that apply to G50.0: its own notes plus those printed at G50, block G50-G59, and Chapter 6. A note printed at a category, block or chapter applies to every code under it.
Includes
Further defines, or gives examples of, the content of the category.
- disorders of 5th cranial nerve
Applicable To
Conditions this code is used for: synonyms of the title or, for "other specified" codes, the conditions assigned to it. The list is not exhaustive.
- Syndrome of paroxysmal facial pain
- Tic douloureux
Excludes1
Not coded here: the excluded code is never reported together with this one, unless the two conditions are unrelated.
Excludes2
Not included here: the excluded condition is not part of this code, but a patient may have both, so both codes may be reported.
- certain conditions originating in the perinatal period (P04-P96)
- certain infectious and parasitic diseases (A00-B99)
- complications of pregnancy, childbirth and the puerperium (O00-O9A)
- congenital malformations, deformations, and chromosomal abnormalities (Q00-Q99)
- endocrine, nutritional and metabolic diseases (E00-E88)
- injury, poisoning and certain other consequences of external causes (S00-T88)
- neoplasms (C00-D49)
- symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R94)
Source: CMS ICD-10-CM Tabular List. How to read instructional notes.
Referenced in Other NotesGuidance
Instructional notes printed at other codes that name G50.0, its category, or a range that includes it.
Index to Diseases and InjuriesGuidance
Alphabetical index entries that point to this code.
Spasm (s), spastic, spasticity See Also: condition; R25.2
nerve, trigeminal G50.0
Syndrome See Also: Disease;
facial pain, paroxysmal G50.0
paroxysmal facial pain G50.0
douloureux G50.0
Clinical ClassificationClinical
AHRQ’s CCSR groups this code into broader clinical categories.
Clinical InformationClinical
Trigeminal Neuralgia
a syndrome characterized by recurrent episodes of excruciating pain lasting several seconds or longer in the sensory distribution of the trigeminal nerve. pain may be initiated by stimulation of trigger points on the face, lips, or gums or by movement of facial muscles or chewing. associated conditions include multiple sclerosis, vascular anomalies, aneurysms, and neoplasms. (adams et al., principles of neurology, 6th ed, p187)
Patient EducationClinical
Trigeminal Neuralgia
Trigeminal neuralgia (TN) is a type of chronic pain that affects your face. It causes extreme, sudden burning or shock-like pain. It usually affects one side of the face. Any vibration on your face, even from talking, can set it off. The condition may come and go, disappearing for days or even months.
Read the full article at MedlinePlus
Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.
Convert G50.0 to ICD-9-CMHistory
The closest ICD-9-CM equivalents under the General Equivalence Mappings.
Code HistoryHistory
Questions About G50.0Overview
What is the ICD-10 code for trigeminal neuralgia?
The ICD-10-CM code for trigeminal neuralgia is G50.0 (sometimes written as G500). It is billable on HIPAA-covered claims from October 1, 2026 through September 30, 2027.
Is G50.0 (Disorders of trigeminal nerve) a billable code?
Yes. This is a billable ICD-10-CM code, specific enough to report trigeminal neuralgia on HIPAA-covered claims from October 1, 2026 through September 30, 2027.
What MS-DRG does G50.0 group to?
When trigeminal neuralgia is the principal diagnosis on an inpatient stay, it groups to MS-DRG 74, 73, with relative weights from 1.0172 to 1.5773 depending on complications. Higher weights mean higher Medicare reimbursement.
Can G50.0 be reported with M79.2?
Not as a rule. The Excludes1 note at block G50-G59, which applies to G50.0, lists "neuralgia NOS (M79.2)". An Excludes1 note means the excluded code is never reported together with this one; the only exception is when the two conditions are unrelated to each other (Official Guidelines, Section I.A.12.a).
What is the ICD-9 equivalent of G50.0?
Under the General Equivalence Mappings, trigeminal neuralgia converts to ICD-9-CM 350.1 (trigeminal neuralgia). The mapping is a direct match.
Does G50.0 risk-adjust for Medicare Advantage payment?
Not for Medicare Advantage: G50.0 maps to no category in the CMS-HCC V28 model. It still risk-adjusts in the RxHCC Part D (V08) category 168 (Trigeminal and Postherpetic Neuralgia).
