2027 ICD-10-CM Diagnosis Code R27.0Ataxia, unspecified
ICD-10-CM Codes›R00–R99›R25-R29›R27
- Billable — Valid for Submission
- Not Chronic
R27.0 is a billable ICD-10-CM diagnosis code for ataxia, unspecified. 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 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
Code Classification
Approximate SynonymsGuidance
Alternate terms and clinical phrases that map to this code.
- Abetalipoproteinemia
- Acquired ataxia
- Acquired ataxia due to vitamin deficiency
- Acute cerebellar ataxia caused by varicella
- Arms ataxic
- Ataxia
- Ataxia caused by alcohol
- Ataxia caused by heavy metal
- Ataxia co-occurrent and due to abetalipoproteinemia
- Ataxia co-occurrent and due to phytanic acid storage disease
- Ataxia due to cerebrotendinous xanthomatosis
- Ataxia due to chronic infection of central nervous system
- Ataxia due to disorder of immune function
- Ataxia due to multiple system atrophy, cerebellar variant
- Ataxia due to subpial siderosis
- Ataxia of bilateral upper limbs
- Ataxia with vitamin E deficiency
- Ataxic hemiparesis
- Benign paroxysmal tonic upgaze of childhood with ataxia
- Bilateral lower limb ataxia
- Drug-induced cerebellar ataxia
- HSMN IV
- Hypermetria
- Hypometria
- Intermittent ataxia
- Legs ataxic
- Mitochondrially encoded ATP synthase membrane subunit 6-related mitochondrial disease
- Motor ataxia
- Muscular atrophy, ataxia, retinitis pigmentosa, and diabetes mellitus
- NARP syndrome
- Neurological muscle weakness
- Nutritional ataxic neuropathy
- Oral motor ataxia
- Peripheral sensory neuropathy
- Postinfectious ataxia
- Progressive myoclonus epilepsy with ataxia
- Progressive truncal ataxia
- Progressive weakness of muscle
- Secondary cerebellar degeneration
- Sensory ataxia
- Sensory ataxic neuropathy
- Single limb ataxia
- Spastic ataxia
- Static ataxia
- Substance-induced ataxia
- Truncal ataxia
Instructional NotesGuidance
Instructions from the official ICD-10-CM Tabular List that apply to R27.0: its own notes plus those printed at R27 and Chapter 18. A note printed at a category, block or chapter applies to every code under it.
Excludes1
Not coded here: the excluded code is never reported together with this one, unless the two conditions are unrelated.
- ataxia following cerebrovascular disease (I69. with final characters -93)
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.
Notes
General instructions on how these codes are used.
- This chapter includes symptoms, signs, abnormal results of clinical or other investigative procedures, and ill-defined conditions regarding which no diagnosis classifiable elsewhere is recorded.
- Signs and symptoms that point rather definitely to a given diagnosis have been assigned to a category in other chapters of the classification. In general, categories in this chapter include the less well-defined conditions and symptoms that, without the necessary study of the case to establish a final diagnosis, point perhaps equally to two or more diseases or to two or more systems of the body. Practically all categories in the chapter could be designated 'not otherwise specified', 'unknown etiology' or 'transient'. The Alphabetical Index should be consulted to determine which symptoms and signs are to be allocated here and which to other chapters. The residual subcategories, numbered .8, are generally provided for other relevant symptoms that cannot be allocated elsewhere in the classification.
- The conditions and signs or symptoms included in categories R00-R94 consist of:
- (a) cases for which no more specific diagnosis can be made even after all the facts bearing on the case have been investigated;
- (b) signs or symptoms existing at the time of initial encounter that proved to be transient and whose causes could not be determined;
- (c) provisional diagnosis in a patient who failed to return for further investigation or care;
- (d) cases referred elsewhere for investigation or treatment before the diagnosis was made;
- (e) cases in which a more precise diagnosis was not available for any other reason;
- (f) certain symptoms, for which supplementary information is provided, that represent important problems in medical care in their own right.
Source: CMS ICD-10-CM Tabular List. How to read instructional notes.
Referenced in Other NotesGuidance
Instructional notes printed at other codes that name R27.0, its category, or a range that includes it.
Excludes1 2
These codes carry an Excludes1 note naming R27.0: they are not reported together with it, unless the two conditions are unrelated.
Index to Diseases and InjuriesGuidance
Clinical ClassificationClinical
AHRQ’s CCSR groups this code into broader clinical categories.
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.
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 R27.0 to ICD-9-CMHistory
The closest ICD-9-CM equivalents under the General Equivalence Mappings.
Code HistoryHistory
Questions About R27.0Overview
What is the ICD-10 code for ataxia, unspecified?
The ICD-10-CM code for ataxia, unspecified is R27.0 (sometimes written as R270). It is billable on HIPAA-covered claims from October 1, 2026 through September 30, 2027.
Is R27.0 (Other lack of coordination) a billable code?
Yes. This is a billable ICD-10-CM code, specific enough to report ataxia, unspecified on HIPAA-covered claims from October 1, 2026 through September 30, 2027.
What MS-DRG does R27.0 group to?
When ataxia, unspecified 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.
Can R27.0 be a principal diagnosis?
Use it with care. This is a symptom code, so once a definitive diagnosis explaining the ataxia, unspecified is established, that condition takes the principal position instead.
Can R27.0 be reported with I69?
Not as a rule. The Excludes1 note on R27.0 lists "ataxia following cerebrovascular disease (I69. with final characters -93)". An Excludes1 note means the excluded code is never reported together with this one; the only exception is when the two conditions are unrelated to each other (Official Guidelines, Section I.A.12.a).
