2027 ICD-10-CM Diagnosis Code G50.1Atypical facial pain

ICD-10-CM Codes›G00–G99›G50-G59›G50

ICD-10-CM G50.1
CMSSource: CMS FY 2027 ICD-10-CM dataset · Effective Oct 1, 2026 – Sep 30, 2027

G50.1 is a billable ICD-10-CM diagnosis code for atypical facial pain. 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. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Nerve and nerve root disorders.

G50.1 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

ICD-10-CM Code
G50.1
Billable Status
Yes — Valid for Submission
Code Describes
Atypical facial pain
Short Description
Atypical facial pain
Same as the full description in the CMS dataset.
Parent Code
G50
Disorders of trigeminal nerve

Code Classification

ChapterG00–G99Diseases of the nervous system
SectionG50-G59Nerve, nerve root and plexus disorders
CategoryG50Disorders of trigeminal nerve
This CodeG50.1Atypical facial pain

Medicare Risk Adjustment (HCC)Billing

G50.1 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.

CMS-HCC V28 (Medicare Advantage Payment Model)
Not mapped
no payment category in the model that pays 100% of MA risk scores
Prior Model (CMS-HCC V24)
Not mapped under V24
this diagnosis newly risk-adjusts under the V28 model
Part D (RxHCC)
RxHCC 168 — Trigeminal and Postherpetic Neuralgia
also risk-adjusts in the Part D prescription drug model (V08)

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.

  • Atypical facial pain

Instructional NotesGuidance

Instructions from the official ICD-10-CM Tabular List that apply to G50.1: 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.

From G50 Disorders of trigeminal nerve applies to 4 codes
  • disorders of 5th cranial nerve

Excludes1

Not coded here: the excluded code is never reported together with this one, unless the two conditions are unrelated.

From Block G50-G59 Nerve, nerve root and plexus disorders applies to 106 codes
  • current traumatic nerve, nerve root and plexus disorders - see Injury, nerve by body region
  • neuralgia NOS (M79.2)
  • neuritis NOS (M79.2)
  • peripheral neuritis in pregnancy (O26.82-)
  • radiculitis NOS (M54.1-)

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.

From Chapter 6 (G00-G99) Diseases of the nervous system applies to 700 codes
  • 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 G50.1, its category, or a range that includes it.

Excludes2 3

These codes carry an Excludes2 note naming G50.1: its condition is not part of those codes, and both may be reported when the patient has both.

  • G44 Other headache syndromes
    atypical facial pain (G50.1)
  • G89 Pain, not elsewhere classified
    atypical face pain (G50.1)
  • R51 Headache
    atypical face pain (G50.1)

Index to Diseases and InjuriesGuidance

Alphabetical index entries that point to this code.

Clinical ClassificationClinical

AHRQ’s CCSR groups this code into broader clinical categories.

CCSR NVS017
Nerve and nerve root disorders
Default principal diagnosis: inpatient Yes · outpatient Yes

Patient EducationClinical

Facial Injuries and Disorders

Face injuries and disorders can cause pain and affect how you look. In severe cases, they can affect sight, speech, breathing and your ability to swallow. Fractures (broken bones), especially in the bones of your nose, cheekbone and jaw, are common facial injuries.

Read the full article at MedlinePlus

Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.

Convert G50.1 to ICD-9-CMHistory

The closest ICD-9-CM equivalents under the General Equivalence Mappings.

ICD-9-CM
350.2 Atypical face pain
Exact Match The mapping is direct, with no qualifiers.

Code HistoryHistory

FY 2016AddedAdded to the ICD-10-CM code setEffective October 1, 2015, the first year of ICD-10-CM.
FY 2017–2026No changes
FY 2027CurrentCurrent code set, no changesEffective October 1, 2026 through September 30, 2027.

Questions About G50.1Overview

What is the ICD-10 code for atypical facial pain?

The ICD-10-CM code for atypical facial pain is G50.1 (sometimes written as G501). It is billable on HIPAA-covered claims from October 1, 2026 through September 30, 2027.

Is G50.1 (Disorders of trigeminal nerve) a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report atypical facial pain on HIPAA-covered claims from October 1, 2026 through September 30, 2027.

What MS-DRG does G50.1 group to?

When atypical facial pain 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 G50.1 be reported with M79.2?

Not as a rule. The Excludes1 note at block G50-G59, which applies to G50.1, 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 G50.1?

Under the General Equivalence Mappings, atypical facial pain converts to ICD-9-CM 350.2 (atypical face pain). The mapping is a direct match.

Does G50.1 risk-adjust for Medicare Advantage payment?

Not for Medicare Advantage: G50.1 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).