2026 ICD-10-CM Diagnosis Code R25.1Tremor, unspecified

ICD-10-CM Codes›R00–R99›R25-R29›R25

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

R25.1 is a billable ICD-10-CM diagnosis code for tremor, unspecified. 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
R25.1
Billable Status
Yes — Valid for Submission
Code Describes
Tremor, unspecified
Short Description
Tremor, unspecified
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 CodeR25.1Tremor, unspecified

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Aspergillus clavatus tremors
  • Bilateral outstretched hands tremor
  • Chronic tremor
  • Coarse tremor
  • Continuous tremor
  • Enhanced physiological tremor
  • Fine tremor
  • Hand tremor
  • Intermittent tremor
  • Lip tremor
  • Massive tremor
  • Passive tremor
  • Persistent tremor
  • Physiological tremor
  • Trembles
  • Tremor
  • Tremor due to central nervous system disease
  • Tremor due to orthostatic hypotension
  • Tremor due to pheochromocytoma
  • Tremor due to substance withdrawal
  • Tremor of limb

Tabular List NotesGuidance

Coding notes and annotation back-references applicable to this code.

Type 1 Excludes

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
          • tremor
    • Hemitremor
    • Tremor(s)

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

  • Ataxia

    impairment of the ability to perform smoothly coordinated voluntary movements. this condition may affect the limbs, trunk, eyes, pharynx, larynx, and other structures. ataxia may result from impaired sensory or motor function. sensory ataxia may result from posterior column injury or peripheral nerve diseases. motor ataxia may be associated with cerebellar diseases; cerebral cortex diseases; thalamic diseases; basal ganglia diseases; injury to the red nucleus; and other conditions.

  • Essential Tremor

    a relatively common disorder characterized by a fairly specific pattern of tremors which are most prominent in the upper extremities and neck, inducing titubations of the head. the tremor is usually mild, but when severe may be disabling. an autosomal dominant pattern of inheritance may occur in some families (i.e., familial tremor). (mov disord 1988;13(1):5-10)

  • Tremor

    cyclical movement of a body part that can represent either a physiologic process or a manifestation of disease. intention or action tremor, a common manifestation of cerebellar diseases, is aggravated by movement. in contrast, resting tremor is maximal when there is no attempt at voluntary movement, and occurs as a relatively frequent manifestation of parkinson disease.

  • Tremorine

    cyclical movement of a body part that can represent either a physiologic process or a manifestation of disease. intention or action tremor, a common manifestation of cerebellar diseases, is aggravated by movement. in contrast, resting tremor is maximal when there is no attempt at voluntary movement, and occurs as a relatively frequent manifestation of parkinson disease.

Patient EducationClinical

Tremor

A tremor is a neurological condition that includes shaking or trembling movements in one or more parts of your body. It most often affects the hands. But it can also affect the arms, legs, head, vocal cords, and torso (trunk). A tremor is involuntary, meaning that you cannot control it. It happens because of muscle contractions.

The full article covers:

  • What is a tremor?
  • What are the types of tremor?
  • What causes tremor?
  • Who is at risk for tremor?
  • What are the symptoms of tremor?
  • How is tremor diagnosed?
  • What are the treatments for tremor?

Read the full article at MedlinePlus

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

Convert R25.1 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 R25.1Overview

Is R25.1 (Abnormal involuntary movements) a billable code?

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

Can R25.1 be a principal diagnosis?

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

What is the ICD-9 equivalent of R25.1?

Under the General Equivalence Mappings, tremor, unspecified 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.