2026 ICD-10-CM Diagnosis Code R25.8Other abnormal involuntary movements

ICD-10-CM Codes›R00–R99›R25-R29›R25

ICD-10-CM R25.8
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

R25.8 is a billable ICD-10-CM diagnosis code for other abnormal involuntary movements. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026). As a symptom code, it should not be used as a principal diagnosis once a related definitive diagnosis has been established. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Nervous system signs and symptoms.

Code Identity

ICD-10-CM Code
R25.8
Billable Status
Yes — Valid for Submission
Code Describes
Other abnormal involuntary movements
Short Description
Other abnormal involuntary movements
Same as the full description in the CMS dataset.
Parent Code
R25
Abnormal involuntary movements

Code Classification

ChapterR00–R99Symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified
SectionR25-R29Symptoms and signs involving the nervous and musculoskeletal systems
CategoryR25Abnormal involuntary movements
This CodeR25.8Other abnormal involuntary movements

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Ankle clonus
  • Ankle clonus present
  • Ankle clonus sustained
  • Ankle clonus unsustained
  • Anodal closure clonus
  • Athetoid movement
  • Athetoid paralysis
  • Athetosis
  • Athetosis with rigidity
  • Athetosis with spastic paraplegia
  • Blink reflex finding
  • Blinking
  • Bradykinesia
  • Clonus
  • Excessive blinking - involuntary
  • Flinging movement
  • Flinging movement of arm
  • Flinging movement of leg
  • Involuntary truncal rocking
  • Movement of eyelid - finding
  • Named sensory sign
  • Opisthotonus
  • Oral rumination
  • Patella clonus unsustained
  • Patellar clonus
  • Patellar clonus present
  • Patellar clonus sustained
  • Posthemiplegic athetosis
  • Pseudoathetosis
  • Sustained clonus
  • Synkinesis
  • Synkinesis of eyelid
  • Synkinesis of face
  • Wrist clonus
  • Writhing movements

Index to Diseases and InjuriesGuidance

Alphabetical index entries that point to this code.

External Cause of Injuries IndexGuidance

References for this code in the External Cause of Injuries Index.

    • Abnormal, abnormality, abnormalities
      • movement (disorder)
        • involuntary
          • specified type NEC
    • Athetosis(acquired)
    • Athetosis(acquired)
      • unilateral
    • Bradykinesia
    • Clonus
    • Convulsions(idiopathic)
      • reflex
    • Dystonic movements
    • Hemiathetosis
    • Movements, dystonic
    • Salaam
      • tic
    • Tic(disorder)
      • salaam

Clinical ClassificationClinical

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

CCSR SYM010
Nervous system signs and symptoms
Default principal diagnosis: inpatient Yes · outpatient Yes

Clinical InformationClinical

  • Blinking

    brief closing of the eyelids by involuntary normal periodic closing, as a protective measure, or by voluntary action.

  • Athetosis

    a dyskinesia characterized by an inability to maintain the fingers, toes, tongue, or other body parts in a stable position, resulting in continuous slow, sinusoidal, and flowing involuntary movements. this condition is frequently accompanied by chorea, where it is referred to as choreoathetosis. athetosis may occur as a manifestation of basal ganglia diseases or drug toxicity. (from adams et al., principles of neurology, 6th ed, p76)

  • Synkinesis

    an involuntary movement accompanying a volitional movement. it often refers to facial movements that accompany facial paralysis.

  • Facial Paralysis

    severe or complete loss of facial muscle motor function. this condition may result from central or peripheral lesions. damage to cns motor pathways from the cerebral cortex to the facial nuclei in the pons leads to facial weakness that generally spares the forehead muscles. facial nerve diseases generally results in generalized hemifacial weakness. neuromuscular junction diseases and muscular diseases may also cause facial paralysis or paresis.

  • Blinking

    voluntary or involuntary rapid closure and opening of the eyelids.

  • Excessive Blinking

    an increased blink rate that affects quality of life.

  • Choreoathetosis, Hypothyroidism, and Neonatal Respiratory Distress|Brain-Lung-Thyroid Syndrome|CAHTP

    an autosomal dominant condition caused by mutation(s) in the nkx2-1 gene, encoding homeobox protein nkx-2.1. it is characterized by choreoathetosis, congenital hypothyroidism, and pulmonary dysfunction.

  • Bradykinesia

    slow movement.

  • Bradykinesia Evaluation|BRADYKIN|Bradykinesia|Bradykinesia

    an evaluation of bradykinesia.

  • ESRS-A - Bradykinesia/Hypokinesia|ESRSA1-Bradykinesia/Hypokinesia|ESRSA1-Bradykinesia/Hypokinesia|ESRSA110

    extrapyramidal symptom rating scale-abbreviated (esrs-a) parkinsonism: bradykinesia or hypokinesia.

  • MDS-UPDRS - Body Bradykinesia|UPD2-Body Bradykinesia|UPD2-Body Bradykinesia|UPD2314

    the movement disorder society version of the unified parkinson's disease rating scale (mds-updrs) global spontaneity of movement (body bradykinesia).

  • UHDRS 1999 Version - Bradykinesia: Body|UHDR1-Bradykinesia: Body|UHDR1-Bradykinesia: Body|UHDR110

    unified huntington's disease rating scale 1999 version (uhdrs 1999 version) bradykinesia-body.

  • UPDRS - Motor Examination: Body Bradykinesia and Hypokinesia|UPD1-Motor:Bradykinesia and Hypokinesia|UPD1-Motor:Bradykinesia and Hypokinesia|UPD131

    unified parkinson's disease rating scale (updrs) motor examination; body bradykinesia and hypokinesia (combining slowness, hesitancy, decreased arm swing, small amplitude, and poverty of movement in general.).

  • Athetosis

    slow, involuntary, and nonpurposeful writhing movements that usually affect the upper limbs.

  • Choreoathetosis|Choreathetosis

    abnormal movement characterized by involuntary jerking and writhing affecting the limbs, trunk, and facial muscles.

  • Infantile Convulsions and Paroxysmal Choreoathetosis, Familial|ICCA|ICCA Syndrome|PKD/IC|Paroxysmal Kinesigenic Dyskinesia with Infantile Convulsions

    an autosomal dominant inherited disorder caused by mutation(s) in the prrt2 gene, encoding proline-rich transmembrane protein 2. it is characterized by epileptic seizures and paroxysmal kinesigenic choreoathetosis. it shares features with episodic kinesigenic dyskinesia-1, which is an allelic disorder.

  • Choreoathetosis, Hypothyroidism, And Neonatal Respiratory Distress|Brain-Lung-Thyroid Syndrome|CAHTP

    an autosomal dominant condition caused by mutation(s) in the nkx2-1 gene, encoding homeobox protein nkx-2.1. it is characterized by choreoathetosis, congenital hypothyroidism, and pulmonary dysfunction.

Patient EducationClinical

Movement Disorders

Movement disorders are neurologic conditions that cause problems with movement, such as:

Read the full article at MedlinePlus

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

Convert R25.8 to ICD-9-CMHistory

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

ICD-9-CM
781.0 Abn involun movement 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 2017–2025No changes
FY 2026CurrentCurrent code set, no changesEffective October 1, 2025 through September 30, 2026.

Questions About R25.8Overview

Is R25.8 (Abnormal involuntary movements) a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report other abnormal involuntary movements on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

Can R25.8 be a principal diagnosis?

Use it with care. This is a symptom code, so once a definitive diagnosis explaining the other abnormal involuntary movements is established, that condition takes the principal position instead.

What is the ICD-9 equivalent of R25.8?

Under the General Equivalence Mappings, other abnormal involuntary movements converts to ICD-9-CM 781.0 (abn involun movement NEC). The mapping is approximate, so confirm the match fits the documentation.

Footnotes

[1] Not chronic - A diagnosis code that does not fit the criteria for chronic condition (duration, ongoing medical treatment, and limitations) is considered not chronic. Some codes designated as not chronic are acute conditions. Other diagnosis codes that indicate a possible chronic condition, but for which the duration of the illness is not specified in the code description (i.e., we do not know the condition has lasted 12 months or longer) also are considered not chronic.