G24.2 ICD-10-CM Code: Idiopathic nonfamilial dystonia

Coding instructions

Official Tabular Instructional Notes: the inclusion, exclusion and sequencing notes published for G24.2 in the official ICD-10-CM tabular list, quoted as published.

Source: CMS/CDC — ICD-10-CM Tabular ListRelease: FY2026Effective: October 1, 2025

Notes without a marker are published on G24.2 itself; “inherited from” names the category or block whose note applies here.

Coder workflow for G24.2

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

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

• Excludes2 — not part of G24.2(1 note)

  Coding workflow: The conditions named in this note are not included in G24.2. When the record documents both, both may be reported; the note is a boundary, not a prohibition.

  CompareG80.3

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

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.

Indexed Clinical Terms (2)

Official source data — entries quoted as published, in the Index’s own lookup phrasing

Clinical term phrases from the official ICD-10-CM Index to Diseases and Injuries that map to this code. These are alphabetic-index entries shown as the Index writes them — lookup phrasing, not necessarily the wording of a final diagnosis.

• Dystonia, idiopathic, nonfamilial
• Dystonia, torsion (familial) (idiopathic), symptomatic (nonfamilial)

Don’t confuse G24.2 with…

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

The codes most likely to be picked instead of G24.2 — 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.

• G24.9— 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 “Dystonia, unspecified” takes G24.9; specificity in the record moves it back here.

  Full comparison: G24.2 vs G24.9 →

• G80.3— Excludes2 relationship (Informational)

  Distinct conditions — both may be reported.

  A distinct condition — both may be reported when both are documented.

  What moves you there: Documentation of athetoid cerebral palsy adds G80.3; it is not part of this code and both may be reported when both are documented.

  Full comparison: G24.2 vs G80.3 →

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.

Verify Before Coding

• CC as a secondary diagnosis (FY2026). Can raise the stay's MS-DRG severity tier.

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

Other codes that name G24.2 or its code family, from the CMS ICD-10-CM tabular instructional notes. Tabular-note edges are stored at the code family level that carries each note.

Referenced by 1 Excludes1 note: R25 — Abnormal involuntary movements (via G24.-).

These codes’ tabular lists mark this diagnosis as mutually exclusive — not reported together unless the conditions are documented as unrelated.

Referenced by 1 Excludes2 note: F98.4 — Stereotyped movement disorders (via G24.-).

These codes’ tabular lists name this diagnosis as distinct — both may be reported when both are documented.

MS-DRG Grouper Relationships (FY2026)

Potential MS-DRG participation — not a DRG assignment.

FY2026 MS-DRG: CC — Complication or Comorbidity. Reported as a secondary diagnosis, this code raises the stay's MS-DRG severity tier — except when the principal diagnosis is one of 27 clinically related codes on its CMS exclusion list.

Named in the grouper logic of 3 MS-DRGs: DRG 091 (MDC 01), DRG 092 (MDC 01), DRG 093 (MDC 01).

From the CMS MS-DRG Definitions Manual (Appendices B and C). Actual DRG assignment depends on the complete claim.

Clinical classification (AHRQ CCSR):NVS006 — Other nervous system disorders (often hereditary or degenerative) (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 process (MS-DRG)

Acts as CC — raises the severity of other admissions. CMS groups these diagnoses into one MS-DRG principal-diagnosis exclusion process — a CC/MCC on this list never raises severity when the principal diagnosis is also on it.

G20.B1 — Parkinson's disease with dyskinesia, without mention of fluctuations, G20.B2 — Parkinson's disease with dyskinesia, with fluctuations, G20.C — Parkinsonism, unspecified, G21.11 — Neuroleptic induced parkinsonism, G21.19 — Other drug induced secondary parkinsonism, G21.2 — Secondary parkinsonism due to other external agents, G21.3 — Postencephalitic parkinsonism, G21.4 — Vascular parkinsonism, G21.8 — Other secondary parkinsonism, G21.9 — Secondary parkinsonism, unspecified, G25.70 — Drug induced movement disorder, unspecified, G25.71 — Drug induced akathisia, G25.79 — Other drug induced movement disorders, G25.89 — Other specified extrapyramidal and movement disorders, G25.9 — Extrapyramidal and movement disorder, unspecified, G80.3 — Athetoid cerebral palsy, G93.40 — Encephalopathy, unspecified, G93.41 — Metabolic encephalopathy, G93.42 — Megalencephalic leukoencephalopathy with subcortical cysts, G93.43 — Leukoencephalopathy with calcifications and cysts, +6 more

Same clinical category (CCSR)

AHRQ's Clinical Classifications Software groups these diagnoses under the same clinical category (Other nervous system disorders (often hereditary or degenerative)).

G23.0 — Hallervorden-Spatz disease, G23.1 — Progressive supranuclear ophthalmoplegia [Steele-Richardson-Olszewski], G23.2 — Striatonigral degeneration, G23.3 — Hypomyelination with atrophy of the basal ganglia and cerebellum, G23.8 — Other specified degenerative diseases of basal ganglia, G23.9 — Degenerative disease of basal ganglia, unspecified, G24.01 — Drug induced subacute dyskinesia, G24.02 — Drug induced acute dystonia, G24.09 — Other drug induced dystonia, G24.1 — Genetic torsion dystonia, G24.3 — Spasmodic torticollis, G24.4 — Idiopathic orofacial dystonia, G24.5 — Blepharospasm, G24.8 — Other dystonia, G24.9 — Dystonia, unspecified, G25.0 — Essential tremor, G25.1 — Drug-induced tremor, G25.2 — Other specified forms of tremor, G25.3 — Myoclonus, G25.4 — Drug-induced chorea, +83 more

Contextual Map

Every relationship of G24.2 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.

Run G24.2 with these 2 related codes in Claim Check

Hierarchy

• G00-G99 — Chapter 6: Diseases of the Nervous System (G00-G99) (G00-G99)[Hierarchy]— CMS ICD-10-CM tabular structure · icd10cm-fy2026
• G20-G26 — Extrapyramidal and movement disorders[Hierarchy]— CMS ICD-10-CM tabular structure · icd10cm-fy2026

Referenced by Excludes1 notes

• R25 — Abnormal involuntary movements[Excludes1](via G24.-): “specific movement disorders (G20-G26)”— CMS ICD-10-CM tabular instructional notes · icd10cm-fy2026

Referenced by Excludes2 notes

• F98.4 — Stereotyped movement disorders[Excludes2](via G24.-): “movement disorders of organic origin (G20-G25)”— CMS ICD-10-CM tabular instructional notes · icd10cm-fy2026

Clinical classification (CCSR)

• NVS006 — Other nervous system disorders (often hereditary or degenerative)[CCSR]— AHRQ CCSR for ICD-10-CM Diagnoses (HCUP)

MS-DRG Grouper

• CC — Complication or Comorbidity [MS-DRG severity]: “As a secondary diagnosis this code can raise the stay's MS-DRG severity tier (CC).”— CMS MS-DRG Definitions Manual (Appendix C) · FY2026
• DRG 091 — OTHER DISORDERS OF NERVOUS SYSTEM WITH MCC[MS-DRG]: “OTHER DISORDERS OF NERVOUS SYSTEM WITH MCC (MDC 01)”— CMS MS-DRG Definitions Manual (Appendix B) · FY2026
• DRG 092 — OTHER DISORDERS OF NERVOUS SYSTEM WITH CC[MS-DRG]: “OTHER DISORDERS OF NERVOUS SYSTEM WITH CC (MDC 01)”— CMS MS-DRG Definitions Manual (Appendix B) · FY2026
• DRG 093 — OTHER DISORDERS OF NERVOUS SYSTEM WITHOUT CC/MCC[MS-DRG]: “OTHER DISORDERS OF NERVOUS SYSTEM WITHOUT CC/MCC (MDC 01)”— CMS MS-DRG Definitions Manual (Appendix B) · FY2026

MDC crossing

• MDC 01 — Diseases and Disorders of the Nervous System[MDC crossing]: “Diseases and Disorders of the Nervous System — the grouper's crossing between diagnoses and procedures: a principal diagnosis sets the MDC, and same-MDC procedures move the stay to its surgical DRGs. 8,892 same-MDC procedures group here; browse them on the MDC page.”— CMS MS-DRG Definitions Manual · FY2026

Index entries

• Dystonia, idiopathic, nonfamilial[Index term]— CMS ICD-10-CM Index to Diseases and Injuries · icd10cm-fy2026
• Dystonia, torsion (familial) (idiopathic), symptomatic (nonfamilial)[Index term]— CMS ICD-10-CM Index to Diseases and Injuries · icd10cm-fy2026

Nearest codes (11)

• G24 — Dystonia[Sibling]— CMS ICD-10-CM tabular structure · icd10cm-fy2026
• G24.0 — Drug induced dystonia[Sibling]— CMS ICD-10-CM tabular structure · icd10cm-fy2026
• G24.01 — Drug induced subacute dyskinesia[Sibling]— CMS ICD-10-CM tabular structure · icd10cm-fy2026
• G24.02 — Drug induced acute dystonia[Sibling]— CMS ICD-10-CM tabular structure · icd10cm-fy2026
• G24.09 — Other drug induced dystonia[Sibling]— CMS ICD-10-CM tabular structure · icd10cm-fy2026
• G24.1 — Genetic torsion dystonia[Sibling]— CMS ICD-10-CM tabular structure · icd10cm-fy2026
• G24.3 — Spasmodic torticollis[Sibling]— CMS ICD-10-CM tabular structure · icd10cm-fy2026
• G24.4 — Idiopathic orofacial dystonia[Sibling]— CMS ICD-10-CM tabular structure · icd10cm-fy2026
• and 3 more

Change history

• FY2016 — In the code set at ICD-10-CM adoption [Change history]— CMS release files (code change ledger) · icd10cm-fy2016

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 FY2026 tabular list, index and tables, effective October 1, 2025 Release, file and checksum · Publisher’s page

Claim edits Official source data

CMS Definitions of Medicare Code Edits — v43.1 (April 2026) Release, file and checksum · Publisher’s page

Inpatient payment groups Official source data

CMS MS-DRG Definitions Manual (incl. Appendix B diagnosis index, Appendix C CC/MCC list, Appendix E procedure index) and IPPS Final Rule tables — v43 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

Nearest Codes in This Family

Official ICD-10-CM classifications closest to G24.2 in its code family, with their registry titles.

• G24.0 — Drug induced dystonia
• G24.01 — Drug induced subacute dyskinesia
• G24.02 — Drug induced acute dystonia
• G24.09 — Other drug induced dystonia
• G24.1 — Genetic torsion dystonia
• G24.3 — Spasmodic torticollis
• G24.4 — Idiopathic orofacial dystonia
• G24.5 — Blepharospasm
• G24.8 — Other dystonia
• G24.9 — Dystonia, unspecified

View all codes in the G24 family