2027 ICD-10-CM Diagnosis Code G25.1Drug-induced tremor

ICD-10-CM Codes›G00–G99›G20-G26›G25

ICD-10-CM G25.1
CMSSource: CMS FY 2027 ICD-10-CM dataset · Effective Oct 1, 2026 – Sep 30, 2027

G25.1 is a billable ICD-10-CM diagnosis code for drug-induced tremor. 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. Coders also document this condition as halothane shakes. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Drug induced or toxic related condition and Other nervous system disorders (often hereditary or degenerative).

Code Identity

ICD-10-CM Code
G25.1
Billable Status
Yes — Valid for Submission
Code Describes
Drug-induced tremor
Short Description
Drug-induced tremor
Same as the full description in the CMS dataset.
Parent Code
G25
Other extrapyramidal and movement disorders

Code Classification

ChapterG00–G99Diseases of the nervous system
SectionG20-G26Extrapyramidal and movement disorders
CategoryG25Other extrapyramidal and movement disorders
This CodeG25.1Drug-induced tremor

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Halothane shakes
  • Medication-induced postural tremor
  • Tremor due to harmful pattern of substance use
  • Tremor opiophagorum

Instructional NotesGuidance

Instructions from the official ICD-10-CM Tabular List that apply to G25.1: its own notes plus those printed at G25 and Chapter 6. A note printed at a category, block or chapter applies to every code under it.

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 G25 Other extrapyramidal and movement disorders applies to 16 codes
  • sleep related movement disorders (G47.6-)
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)

Use Additional Code

Add a second code, after this one, to fully describe the condition.

  • code for adverse effect, if applicable, to identify drug (T36-T50 with fifth or sixth character 5)

Source: CMS ICD-10-CM Tabular List. How to read instructional notes.

Referenced in Other NotesGuidance

Instructional notes printed at other codes that name G25.1, its category, or a range that includes it.

Excludes1 1

These codes carry an Excludes1 note naming G25.1: 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 G25.1: 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 INJ030
Drug induced or toxic related condition
Default principal diagnosis: inpatient Yes · outpatient Yes
CCSR NVS006
Other nervous system disorders (often hereditary or degenerative)
Default principal diagnosis: inpatient No · outpatient No

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 G25.1 to ICD-9-CMHistory

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

ICD-9-CM
333.1 Tremor 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 G25.1Overview

What is the ICD-10 code for drug-induced tremor?

The ICD-10-CM code for drug-induced tremor is G25.1 (sometimes written as G251). It is billable on HIPAA-covered claims from October 1, 2026 through September 30, 2027.

Is G25.1 (Other extrapyramidal and movement disorders) a billable code?

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

What MS-DRG does G25.1 group to?

When drug-induced tremor 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.

Does G25.1 need an additional code?

When the condition applies, yes. The Use Additional Code note reads: code for adverse effect, if applicable, to identify drug (T36-T50 with fifth or sixth character 5). The additional code is reported after G25.1.

What is the ICD-9 equivalent of G25.1?

Under the General Equivalence Mappings, drug-induced tremor converts to ICD-9-CM 333.1 (tremor NEC). The mapping is approximate, so confirm the match fits the documentation.