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G51.3 ICD-10-CM Code: Clonic hemifacial spasm

Billing Status: NO. This is a clinician non-billable / parent hierarchy grouping in the ICD-10-CM system.

Coding at a Glance

Tabular directives
1 inclusion term · 5 Excludes1

Coding instructions

Official Tabular Instructional Notes: the inclusion, exclusion and sequencing notes published for G51.3 in the official ICD-10-CM tabular list, quoted as published.

Source: CMS/CDC — ICD-10-CM Tabular ListRelease: FY2027Effective: October 1, 2026

Trace:FY2027 changesChange historyRelease, file and checksum

Notes without a marker are published on G51.3 itself; “inherited from” names the category or block whose note applies here.

Includes

Conditions the official ICD-10-CM tabular list includes under this code.

  • disorders of 7th cranial nerve

Source: inherited from G51

Excludes1 — Not Coded Here

Conditions generally not reported together with this code (Excludes1) -- an error unless the two conditions are documented as unrelated to each other (ICD-10-CM Official Guidelines, Section I.A.12.a).

Source: inherited from G50-G59

Coder workflow for G51.3

MedCoder structured workflow — derived from this code’s own official record

Before you code G51.3

  1. G51.3 is not reportable as written. Select the more specific code beneath it that the documentation supports. Codes are reported to the highest level of specificity the classification provides (Guidelines I.B.2).

    ReviewG51.31, G51.32, G51.33, G51.39

    See the relationships section · Guide: How to choose an ICD-10-CM code →

  2. Check the Excludes1 note: if the documentation supports a condition named there, do not simply proceed with G51.3. Excludes1 conditions are not reported together with this code unless the record shows they are unrelated (Guidelines I.A.12.a).

    See the official tabular notes

Choose the right path

  1. Does the documentation support one of the more specific codes beneath G51.3?
    Yes → Select that code and continue the checks below on its own page.
    No → G51.3 cannot be reported as written; query for the specificity its subcategory needs.

    ReviewG51.31, G51.32, G51.33, G51.39

  2. Does the documentation support a condition named in G51.3’s Excludes1 note?
    Yes → Do not simply proceed: review the excluded code. Both are reported only when the record shows the two conditions are unrelated.
    No → Continue.

    ReviewM79.2, O26.82, M54.1

Consider G51.3. Then confirm the code is valid for the date of service in the Verify section.

Documentation check

The provider’s diagnostic statement
Codes are assigned from the provider’s documented diagnosis, not from clinical criteria, test values or a medication list (Guidelines I.A.19).

Official instructions as workflow

  • Excludes1 — check before selecting G51.3(5 notes)

    Coding workflow: If the documentation supports a condition named in this note, do not simply proceed with G51.3: the two are not reported together. The one exception is when the record shows the two conditions are unrelated to each other.

    CompareM79.2, O26.82, M54.1

    See the official tabular notes · Guidelines I.A.12.a

Coding decision scenarios

Pattern scenarios for this code’s structure — decision rules, not clinical cases

Documentation: Both the condition G51.3 describes and a condition named in its Excludes1 note are documented for the same encounter.

Coding question: Can both codes be reported?

Path: Review the Excludes1 note and the excluded code, and look for a provider statement on whether the two conditions are related.

Reason: Excludes1 means the two are not coded together; the exception is when the record shows the conditions are unrelated to each other (Guidelines I.A.12.a).

ReviewM79.2, O26.82, M54.1

Every row is derived from this code’s own record — its title, tabular notes, 7th-character family and same-category siblings — with fixed MedCoder wording; nothing is inferred about a patient. The official notes and guideline text are in the sections each row links to, and they control.

Don’t confuse G51.3 with…

MedCoder analysis — pairs from this code’s official notes, distinctions written by MedCoder

The codes most likely to be picked instead of G51.3 — named in its own official notes, or sharing its laterality or encounter family — with what separates them and which documentation moves the case. Each links to the full comparison.

  • M79.2— Excludes1 conflict (Excludes1 — generally not reported together)

    Not coded here — the tabular list excludes this pair for the same encounter.

    Not reported together with this code, except where the two conditions are documented as unrelated.

    What moves you there: Documentation of neuralgia NOS moves the case to M79.2; the two are not reported together unless documented as unrelated.

    Full comparison: G51.3 vs M79.2 →

  • O26.82— Excludes1 conflict (Excludes1 — generally not reported together)

    Not coded here — the tabular list excludes this pair for the same encounter.

    Not reported together with this code, except where the two conditions are documented as unrelated.

    What moves you there: Documentation of peripheral neuritis in pregnancy moves the case to O26.82; the two are not reported together unless documented as unrelated.

    Full comparison: G51.3 vs O26.82 →

  • M54.1— Excludes1 conflict (Excludes1 — generally not reported together)

    Not coded here — the tabular list excludes this pair for the same encounter.

    Not reported together with this code, except where the two conditions are documented as unrelated.

    What moves you there: Documentation of radiculitis NOS moves the case to M54.1; the two are not reported together unless documented as unrelated.

    Full comparison: G51.3 vs M54.1 →

  • G51.9— Specificity relationship (Review)

    Overlapping diagnoses in the same category.

    Overlapping codes in the same category — the documentation decides which is the more specific fit.

    What moves you there: A record that documents no more than “Disorder of facial nerve, unspecified” takes G51.9; specificity in the record moves it back here.

    Full comparison: G51.3 vs G51.9 →

Relationships are read from this code's own official notes, its laterality siblings and its encounter family; the wording of each distinction is MedCoder editorial, and the documentation named in each “what moves you there” line is the official note phrase or sibling title itself. Source: CMS ICD-10-CM tabular instructional notes; ICD-10-CM Official Guidelines, Section I.A.12.a.

Code Overview

Clonic hemifacial spasm is a non-billable ICD-10-CM category code (G51.3). A more specific billable subcode must be selected for claims submission.

MedCoder summary Summary composed by MedCoder from this code's official ICD-10-CM record. The tabular instructional notes themselves appear verbatim below.

Verify Before Coding

From the code registry, the Medicare Code Editor, and the MS-DRG Definitions Manual. Check it against a full claim in Claim Check.

Relationships & Classification

MedCoder structured relationships — computed from published CMS and AHRQ datasets

Clinical classification (AHRQ CCSR):NVS017 — Nerve and nerve root disorders (default).

Clinical Classifications Software Refined (CCSR) for ICD-10-CM Diagnoses. Healthcare Cost and Utilization Project (HCUP), Agency for Healthcare Research and Quality.

Related Codes

Same clinical category (CCSR)

AHRQ's Clinical Classifications Software groups these diagnoses under the same clinical category (Nerve and nerve root disorders).

E10.41 — Type 1 diabetes mellitus with diabetic mononeuropathy, E11.41 — Type 2 diabetes mellitus with diabetic mononeuropathy, E13.41 — Other specified diabetes mellitus with diabetic mononeuropathy, G50.0 — Trigeminal neuralgia, G50.1 — Atypical facial pain, G50.8 — Other disorders of trigeminal nerve, G50.9 — Disorder of trigeminal nerve, unspecified, G51.0 — Bell's palsy, G51.1 — Geniculate ganglionitis, G51.2 — Melkersson's syndrome, G51.31 — Clonic hemifacial spasm, right, G51.32 — Clonic hemifacial spasm, left, G51.33 — Clonic hemifacial spasm, bilateral, G51.39 — Clonic hemifacial spasm, unspecified, G51.4 — Facial myokymia, G51.8 — Other disorders of facial nerve, G51.9 — Disorder of facial nerve, unspecified, G52.0 — Disorders of olfactory nerve, G52.1 — Disorders of glossopharyngeal nerve, G52.2 — Disorders of vagus nerve, +94 more

Same Index main term, other category

The ICD-10-CM Index to Diseases and Injuries files this code under the main terms “Spasm, spastic, spasticity”, “Myoclonus, myoclonic, myoclonia”, “Bell's”; these codes share that main term but sit in a different category of the Tabular List.

F95.1 — Chronic motor or vocal tic disorder (tic, chronic), F95.9 — Tic disorder, unspecified (tic), F98.4 — Stereotyped movement disorders (nodding), G24.1 — Genetic torsion dystonia (torsion), G25.3 — Myoclonus, G40.4 — Other generalized epilepsy and epileptic syndromes (epilepsy), G40.401 — Other generalized epilepsy and epileptic syndromes, not intractable, with status epilepticus (epileptica, with status epilepticus), G40.409 — Other generalized epilepsy and epileptic syndromes, not intractable, without status epilepticus (epileptica), G45.9 — Transient cerebral ischemic attack, unspecified (cerebral), G50.0 — Trigeminal neuralgia (nerve, trigeminal), H51.8 — Other specified disorders of binocular movement (conjugate), H52.53 — Spasm of accommodation (of accommodation), I20.1 — Angina pectoris with documented spasm (heart), I73.9 — Peripheral vascular disease, unspecified (artery), I87.8 — Other specified disorders of veins (vein NEC), J38.5 — Laryngeal spasm (glottis), J39.2 — Other diseases of pharynx (throat), J98.01 — Acute bronchospasm (bronchus, bronchiole), K14.8 — Other diseases of tongue (tongue), K22.0 — Achalasia of cardia (cardia), +30 more

Contextual Map

Every relationship of G51.3 in one view: hierarchy, official tabular instructions in both directions, clinical classification, risk adjustment, MS-DRG participation, index terms and change history — each edge carrying the CMS source it derives from.

Hierarchy

Clinical classification (CCSR)

Nearest codes (11)

Change history (2)

Common coding questions

Can G51.3 be billed directly?

No. G51.3 (Clonic hemifacial spasm) is a non-billable ICD-10-CM category code. A more specific billable subcode must be selected based on clinical documentation.

Sources for this page

Codes, titles, notes, index terms and mappings on this page are transcribed from the datasets below. Relationships MedCoder computed and text MedCoder wrote are labelled where they appear.

Code, title, tabular notes and index terms Official source data
CMS/CDC ICD-10-CM FY2027 tabular list, index and tables, effective October 1, 2026 Release, file and checksum · Publisher’s page
Claim edits Official source data
CMS Definitions of Medicare Code Edits — v44.0 (October 2026) Release, file and checksum · Publisher’s page
Change history and date-of-service validity Official source data
CMS ICD-10-CM release addenda, ingested release by release into the change ledger Release, file and checksum · Publisher’s page
Comparisons, relationships and the contextual map MedCoder structured relationship
Computed by MedCoder from the tabular notes and tables above; every derived relationship is marked as derived where it appears
Summary and FAQ answers MedCoder explanation
Written by MedCoder to explain the sources above: drafted with AI assistance, checked by a person against the release files, and labelled as MedCoder text where it appears. Not official text.

Labels on this page: Official source data · MedCoder structured relationship · MedCoder explanation. How to read the labels · All data sources and release dates

Cite this page

Reference this page in a research guide, syllabus or article. The release is included because code content changes each year.

MedCoder.ai. "G51.3 — Clonic hemifacial spasm." ICD-10-CM FY2027. https://medcoder.ai/icd10/code/g51.3-clonic-hemifacial-spasm

Change history

  • FY2019 — October 1, 2018
    Became a non-billable header
    FY2019 changes
  • FY2016 — October 1, 2015
    In the code set at ICD-10-CM adoption
    Clonic hemifacial spasm

Nearest Codes in This Family

Official ICD-10-CM classifications closest to G51.3 in its code family, with their registry titles.

View all codes in the G51 family