2027 ICD-10-CM Diagnosis Code G24.2Idiopathic nonfamilial dystonia

ICD-10-CM Codes›G00–G99›G20-G26›G24

ICD-10-CM G24.2
CMSSource: CMS FY 2027 ICD-10-CM dataset · Effective Oct 1, 2026 – Sep 30, 2027

G24.2 is a billable ICD-10-CM diagnosis code for idiopathic nonfamilial dystonia. It is valid on HIPAA claims for fiscal year 2027 (October 1, 2026 through September 30, 2027) and groups to MS-DRG 91 through 93. As a secondary diagnosis, it counts as a complication or comorbidity (CC) and moves an inpatient stay to a higher severity level within its MS-DRG family. It does not count, however, when the principal diagnosis is one of 27 closely related codes. Coders also document this condition as idiopathic non-familial dystonia. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Other nervous system disorders (often hereditary or degenerative).

Code Identity

ICD-10-CM Code
G24.2
Billable Status
Yes — Valid for Submission
Code Describes
Idiopathic nonfamilial dystonia
Short Description
Idiopathic nonfamilial dystonia
Same as the full description in the CMS dataset.
Parent Code
G24
Dystonia

Code Classification

ChapterG00–G99Diseases of the nervous system
SectionG20-G26Extrapyramidal and movement disorders
CategoryG24Dystonia
This CodeG24.2Idiopathic nonfamilial dystonia

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Idiopathic non-familial dystonia

Instructional NotesGuidance

Instructions from the official ICD-10-CM Tabular List that apply to G24.2: its own notes plus those printed at G24 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 G24 Dystonia applies to 10 codes
  • dyskinesia

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 G24 Dystonia applies to 10 codes
  • athetoid cerebral palsy (G80.3)
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 G24.2, its category, or a range that includes it.

Excludes1 1

These codes carry an Excludes1 note naming G24.2: they are not reported together with it, unless the two conditions are unrelated.

  • R25 Abnormal involuntary movements
    specific movement disorders (G20-G26) names G20-G26, which includes this code

Excludes2 1

These codes carry an Excludes2 note naming G24.2: its condition is not part of those codes, and both may be reported when the patient has both.

  • F98.4 Stereotyped movement disorders
    movement disorders of organic origin (G20-G25) names G20-G25, which includes this code

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 NVS006
Other nervous system disorders (often hereditary or degenerative)
Default principal diagnosis: inpatient Yes · outpatient Yes

Clinical InformationClinical

  • Dystonia

    an attitude or posture due to the co-contraction of agonists and antagonist muscles in one region of the body. it most often affects the large axial muscles of the trunk and limb girdles. conditions which feature persistent or recurrent episodes of dystonia as a primary manifestation of disease are referred to as dystonic disorders. (adams et al., principles of neurology, 6th ed, p77)

Patient EducationClinical

Dystonia

Dystonia is a movement disorder that causes involuntary contractions of your muscles. These contractions result in twisting and repetitive movements. Sometimes they are painful.

Read the full article at MedlinePlus

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

Convert G24.2 to ICD-9-CMHistory

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

ICD-9-CM
333.79 Acq torsion dystonia NEC
Approximate The match is approximate rather than exact.

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 G24.2Overview

What is the ICD-10 code for idiopathic nonfamilial dystonia?

The ICD-10-CM code for idiopathic nonfamilial dystonia is G24.2 (sometimes written as G242). It is billable on HIPAA-covered claims from October 1, 2026 through September 30, 2027.

Is G24.2 (Dystonia) a billable code?

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

What MS-DRG does G24.2 group to?

When idiopathic nonfamilial dystonia is the principal diagnosis on an inpatient stay, it groups to MS-DRG 91, 92, 93, with relative weights from 0.7783 to 1.7050 depending on complications. Higher weights mean higher Medicare reimbursement.

Is G24.2 a CC or MCC?

CMS lists G24.2 as a CC (complication or comorbidity) for FY 2027. Reported as a secondary diagnosis, it moves the inpatient stay to a higher-weighted DRG within its severity family. It does not count when the principal diagnosis is one of the 27 closely related codes in its exclusion list.

What is the ICD-9 equivalent of G24.2?

Under the General Equivalence Mappings, idiopathic nonfamilial dystonia converts to ICD-9-CM 333.79 (acq torsion dystonia NEC). The mapping is approximate, so confirm the match fits the documentation.