2026 ICD-10-CM Diagnosis Code G81.90Hemiplegia, unspecified affecting unspecified side

ICD-10-CM Codes›G00–G99›G80-G83›G81

ICD-10-CM G81.90
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

G81.90 is a billable ICD-10-CM diagnosis code for hemiplegia, unspecified affecting unspecified side. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026). The code is flagged as an unspecified code, since codes identifying laterality exist in the same family. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Paralysis (other than cerebral palsy).

Code Identity

ICD-10-CM Code
G81.90
Billable Status
Yes — Valid for Submission
Code Describes
Hemiplegia, unspecified affecting unspecified side
Short Description
Hemiplegia, unspecified affecting unspecified side
Same as the full description in the CMS dataset.
Parent Code
G81.9
Hemiplegia, unspecified

Code Classification

ChapterG00–G99Diseases of the nervous system
SectionG80-G83Cerebral palsy and other paralytic syndromes
CategoryG81Hemiplegia and hemiparesis
This CodeG81.90Hemiplegia, unspecified affecting unspecified side

Code EditsBilling

Medicare Code Editor checks that affect claim validity for G81.90.

Unspecified codes
Unspecified codes exist in the ICD-10-CM classification for circumstances when documentation in the medical record does not provide the level of detail needed to support reporting a more specific code. However, in the inpatient setting, there should generally be very limited and rare circumstances for which the laterality (right, left, bilateral) of a condition is unable to be documented and reported. The following pages contain the list of unspecified ICD-10-CM diagnosis codes for which there is a more specific code to identify laterality (right, left, bilateral) within that code family.

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Alternating hypoglossal hemiplegia
  • Ataxic hemiparesis
  • Cerebral hemiparesis
  • Cerebral hemiplegia
  • Crossed hemiparesis
  • Facial hemiplegia
  • Functional hemiparesis
  • Hemiparesis
  • Hemiplegia
  • Hemiplegia of dominant side
  • Infantile hemiplegia
  • Left hemiparesis
  • Left hemiplegia
  • Residual hemiplegia
  • Right hemiparesis
  • Right hemiplegia
  • Spinal hemiparesis
  • Transient hemiplegia
  • Twelfth cranial nerve finding

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.

    • Hemiplegia
      • ascending NEC

Clinical ClassificationClinical

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

CCSR NVS008
Paralysis (other than cerebral palsy)
Default principal diagnosis: inpatient Yes · outpatient Yes

Clinical InformationClinical

  • Hemiplegia

    severe or complete loss of motor function on one side of the body. this condition is usually caused by brain diseases that are localized to the cerebral hemisphere opposite to the side of weakness. less frequently, brain stem lesions; cervical spinal cord diseases; peripheral nervous system diseases; and other conditions may manifest as hemiplegia. the term hemiparesis (see paresis) refers to mild to moderate weakness involving one side of the body.

  • Grade 1 Hemiparesis, CTCAE

    symptomatic; perceived by patient but not evident on physical exam

  • Grade 2 Hemiparesis, CTCAE

    symptomatic; evident on physical exam; limiting instrumental adl or mild/moderate impact on age-appropriate normal daily activity (pediatric)

  • Grade 3 Hemiparesis, CTCAE

    limiting self-care adl or severe impact on age-appropriate normal daily activity (pediatric)

  • Hemiparesis, CTCAE

    a disorder characterized by a reduction in the strength of the muscles on one side of the body.

  • Has Hemiplegia Question|Does the patient have hemiplegia|Has Hemiplegia

    a question about whether an individual has or had hemiplegia.

  • Hemiparesis

    weakness or incomplete paralysis of either the left or right side of the body.

  • Kurtzke Functional System Scores KFSS101 Original Result - Marked paraparesis or hemiparesis; moderate quadriparesis; or monoplegia|KFSS101-Marked paraparesis or hemiparesis; moderate quadriparesis; or monoplegia|Marked paraparesis or hemiparesis; moderate quadriparesis; or monoplegia

    kurtzke functional system scores kfss101 original result - marked paraparesis or hemiparesis; moderate quadriparesis; or monoplegia.

  • Kurtzke Functional System Scores KFSS101 Original Result - Mild or moderate paraparesis or hemiparesis; severe monoparesis|KFSS101-Mild or moderate paraparesis or hemiparesis; severe monoparesis|Mild or moderate paraparesis or hemiparesis; severe monoparesis

    kurtzke functional system scores kfss101 original result - mild or moderate paraparesis or hemiparesis; severe monoparesis.

  • Flaccid Hemiplegia Affecting Left Dominant Side|Flaccid hemiplegia affecting left dominant side

    evidence of flaccid hemiplegia affecting the left dominant side.

  • Flaccid Hemiplegia Affecting Left Non-Dominant Side|Flaccid hemiplegia affecting left non-dominant side

    evidence of flaccid hemiplegia affecting the left non-dominant side.

  • Flaccid Hemiplegia Affecting Right Dominant Side|Flaccid hemiplegia affecting right dominant side

    evidence of flaccid hemiplegia affecting the right dominant side.

  • Flaccid Hemiplegia Affecting Right Non-Dominant Side|Flaccid hemiplegia affecting right non-dominant side

    evidence of flaccid hemiplegia affecting the right non-dominant side.

  • Flaccid Hemiplegia Affecting Unspecified Side|Flaccid hemiplegia affecting unspecified side

    evidence of flaccid hemiplegia affecting the unspecified side.

  • Has Hemiplegia|Does the patient have hemiplegia

    a question about whether an individual has or had hemiplegia.

  • Hemiplegia

    paralysis of one side of the body.

  • Hemiplegia following Cerebral Infarction Affecting Left Dominant Side|Hemiplegia following cerebral infarction affecting left dominant side

    evidence of hemiplegia following cerebral infarction affecting left dominant side.

  • Hemiplegia following Cerebral Infarction Affecting Left Non-Dominant Side|Hemiplegia following cerebral infarction affecting left non-dominant side

    evidence of hemiplegia following cerebral infarction affecting left non-dominant side.

  • Hemiplegia following Cerebral Infarction Affecting Right Dominant Side|Hemiplegia following cerebral infarction affecting right dominant side

    evidence of hemiplegia following cerebral infarction affecting right dominant side.

  • Hemiplegia following Cerebral Infarction Affecting Right Non-Dominant Side|Hemiplegia following cerebral infarction affecting right non-dominant side

    evidence of hemiplegia following cerebral infarction affecting right non-dominant side.

  • Hemiplegia following Cerebral Infarction Affecting Unspecified Side|Hemiplegia following cerebral infarction affecting unspecified side

    evidence of hemiplegia following cerebral infarction affecting unspecified side.

  • Hemiplegia following Non-Traumatic Intracerebral Hemorrhage Affecting Left Dominant Side|Hemiplegia following non-traumatic intracerebral hemorrhage affecting left dominant side

    evidence of hemiplegia following non-traumatic intracerebral hemorrhage affecting left dominant side.

  • Hemiplegia following Non-Traumatic Intracerebral Hemorrhage Affecting Left Non-Dominant Side|Hemiplegia following non-traumatic intracerebral hemorrhage affecting left non-dominant side

    evidence of hemiplegia following non-traumatic intracerebral hemorrhage affecting left non-dominant side.

  • Hemiplegia following Non-Traumatic Intracerebral Hemorrhage Affecting Right Dominant Side|Hemiplegia following non-traumatic intracerebral hemorrhage affecting right dominant side

    evidence of hemiplegia following non-traumatic intracerebral hemorrhage affecting right dominant side.

  • Hemiplegia following Non-Traumatic Intracerebral Hemorrhage Affecting Right Non-Dominant Side|Hemiplegia following non-traumatic intracerebral hemorrhage affecting right non-dominant side

    evidence of hemiplegia following non-traumatic intracerebral hemorrhage affecting right non-dominant side.

  • Hemiplegia following Non-Traumatic Intracerebral Hemorrhage Affecting Unspecified Side|Hemiplegia following non-traumatic intracerebral hemorrhage affecting unspecified side

    evidence of hemiplegia following non-traumatic intracerebral hemorrhage affecting unspecified side.

  • Hemiplegia following Non-Traumatic Subarachnoid Hemorrhage Affecting Left Dominant Side|Hemiplegia following non-traumatic subarachnoid hemorrhage affecting left dominant side

    evidence of hemiplegia following non-traumatic subarachnoid hemorrhage affecting left dominant side.

  • Hemiplegia following Non-Traumatic Subarachnoid Hemorrhage Affecting Left Non-Dominant Side|Hemiplegia following non-traumatic subarachnoid hemorrhage affecting left non-dominant side

    evidence of hemiplegia following non-traumatic subarachnoid hemorrhage affecting left non-dominant side.

  • Hemiplegia following Non-Traumatic Subarachnoid Hemorrhage Affecting Right Dominant Side|Hemiplegia following non-traumatic subarachnoid hemorrhage affecting right dominant side

    evidence of hemiplegia following non-traumatic subarachnoid hemorrhage affecting right dominant side.

  • Hemiplegia following Non-Traumatic Subarachnoid Hemorrhage Affecting Right Non-Dominant Side|Hemiplegia following non-traumatic subarachnoid hemorrhage affecting right non-dominant side

    evidence of hemiplegia following non-traumatic subarachnoid hemorrhage affecting right non-dominant side.

  • Hemiplegia following Non-Traumatic Subarachnoid Hemorrhage Affecting Unspecified Side|Hemiplegia following non-traumatic subarachnoid hemorrhage affecting unspecified side

    evidence of hemiplegia following non-traumatic subarachnoid hemorrhage affecting unspecified side.

  • Hemiplegia following Other Cerebrovascular Disease Affecting Left Dominant Side|Hemiplegia following other cerebrovascular disease affecting left dominant side

    evidence of hemiplegia following other cerebrovascular disease affecting left dominant side.

  • Hemiplegia following Other Cerebrovascular Disease Affecting Left Non-Dominant Side|Hemiplegia following other cerebrovascular disease affecting left non-dominant side

    evidence of hemiplegia following other cerebrovascular disease affecting left non-dominant side.

  • Hemiplegia following Other Cerebrovascular Disease Affecting Right Dominant Side|Hemiplegia following other cerebrovascular disease affecting right dominant side

    evidence of hemiplegia following other cerebrovascular disease affecting right dominant side.

  • Hemiplegia following Other Cerebrovascular Disease Affecting Right Non-Dominant Side|Hemiplegia following other cerebrovascular disease affecting right non-dominant side

    evidence of hemiplegia following other cerebrovascular disease affecting right non-dominant side.

  • Hemiplegia following Other Cerebrovascular Disease Affecting Unspecified Side|Hemiplegia following other cerebrovascular disease affecting unspecified side

    evidence of hemiplegia following other cerebrovascular disease affecting unspecified side.

  • Hemiplegia following Other Non-Traumatic Intracranial Hemorrhage Affecting Left Dominant Side|Hemiplegia following other non-traumatic intracranial hemorrhage affecting left dominant side

    evidence of hemiplegia following other non-traumatic intracranial hemorrhage affecting left dominant side.

  • Hemiplegia following Other Non-Traumatic Intracranial Hemorrhage Affecting Left Non-Dominant Side|Hemiplegia following other non-traumatic intracranial hemorrhage affecting left non-dominant side

    evidence of hemiplegia following other non-traumatic intracranial hemorrhage affecting left non-dominant side.

  • Hemiplegia following Other Non-Traumatic Intracranial Hemorrhage Affecting Right Dominant Side|Hemiplegia following other non-traumatic intracranial hemorrhage affecting right dominant side

    evidence of hemiplegia following other non-traumatic intracranial hemorrhage affecting right dominant side.

  • Hemiplegia following Other Non-Traumatic Intracranial Hemorrhage Affecting Right Non-Dominant Side|Hemiplegia following other non-traumatic intracranial hemorrhage affecting right non-dominant side

    evidence of hemiplegia following other non-traumatic intracranial hemorrhage affecting right non-dominant side.

  • Hemiplegia following Other Non-Traumatic Intracranial Hemorrhage Affecting Unspecified Side|Hemiplegia following other non-traumatic intracranial hemorrhage affecting unspecified side

    evidence of hemiplegia following other non-traumatic intracranial hemorrhage affecting unspecified side.

  • Hemiplegia following Unspecified Cerebrovascular Disease Affecting Left Dominant Side|Hemiplegia following unspecified cerebrovascular disease affecting left dominant side

    evidence of hemiplegia following unspecified cerebrovascular disease affecting left dominant side.

  • Hemiplegia following Unspecified Cerebrovascular Disease Affecting Left Non-Dominant Side|Hemiplegia following unspecified cerebrovascular disease affecting left non-dominant side

    evidence of hemiplegia following unspecified cerebrovascular disease affecting left non-dominant side.

  • Hemiplegia following Unspecified Cerebrovascular Disease Affecting Right Dominant Side|Hemiplegia following unspecified cerebrovascular disease affecting right dominant side

    evidence of hemiplegia following unspecified cerebrovascular disease affecting right dominant side.

  • Hemiplegia following Unspecified Cerebrovascular Disease Affecting Right Non-Dominant Side|Hemiplegia following unspecified cerebrovascular disease affecting right non-dominant side

    evidence of hemiplegia following unspecified cerebrovascular disease affecting right non-dominant side.

  • Hemiplegia following Unspecified Cerebrovascular Disease Affecting Unspecified Side|Hemiplegia following unspecified cerebrovascular disease affecting unspecified side

    evidence of hemiplegia following unspecified cerebrovascular disease affecting unspecified side.

  • Hemiplegia, Unspecified Affecting Left Dominant Side|Hemiplegia, unspecified affecting left dominant side

    evidence of hemiplegia, unspecified affecting left dominant side.

  • Hemiplegia, Unspecified Affecting Left Non-Dominant Side|Hemiplegia, unspecified affecting left non-dominant side

    evidence of hemiplegia, unspecified affecting left non-dominant side.

  • Hemiplegia, Unspecified Affecting Right Dominant Side|Hemiplegia, unspecified affecting right dominant side

    evidence of hemiplegia, unspecified affecting right dominant side.

  • Hemiplegia, Unspecified Affecting Right Non-Dominant Side|Hemiplegia, unspecified affecting right non-dominant side

    evidence of hemiplegia, unspecified affecting right non-dominant side.

  • Hemiplegia, Unspecified Affecting Unspecified Side|Hemiplegia, unspecified affecting unspecified side

    evidence of hemiplegia, unspecified affecting unspecified side.

  • Kurtzke Functional System Scores KFSS101 Original Result - Paraplegia, hemiplegia, or marked quadriparesis|KFSS101-Paraplegia, hemiplegia, or marked quadriparesis|Paraplegia, hemiplegia, or marked quadriparesis

    kurtzke functional system scores kfss101 original result - paraplegia, hemiplegia, or marked quadriparesis.

  • Spastic Hemiplegia Affecting Left Dominant Side|Spastic hemiplegia affecting left dominant side

    evidence of spastic hemiplegia affecting left dominant side.

  • Spastic Hemiplegia Affecting Left Non-Dominant Side|Spastic hemiplegia affecting left non-dominant side

    evidence of spastic hemiplegia affecting left non-dominant side.

  • Spastic Hemiplegia Affecting Right Dominant Side|Spastic hemiplegia affecting right dominant side

    evidence of spastic hemiplegia affecting right dominant side.

  • Spastic Hemiplegia Affecting Right Non-Dominant Side|Spastic hemiplegia affecting right non-dominant side

    evidence of spastic hemiplegia affecting right non-dominant side.

  • Spastic Hemiplegia|Spastic hemiplegia affecting unspecified side|Spastic hemiplegic cerebral palsy

    a type of spastic cerebral palsy characterized by increased muscle tone of the arm and leg on the same side of the body.

Patient EducationClinical

Paralysis

Paralysis is the loss of muscle function in part of your body. It happens when something goes wrong with the way messages pass between your brain and muscles. Paralysis can be complete or partial. It can occur on one or both sides of your body. It can also occur in just one area, or it can be widespread.

Read the full article at MedlinePlus

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

Convert G81.90 to ICD-9-CMHistory

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

ICD-9-CM
342.80 Ot sp hmiplga unspf side
Approximate The match is approximate rather than exact.
ICD-9-CM
342.90 Unsp hemiplga unspf side
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 G81.90Overview

Is G81.90 (Hemiplegia, unspecified) a billable code?

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

What is the ICD-9 equivalent of G81.90?

Under the General Equivalence Mappings, hemiplegia, unspecified affecting unspecified side converts to ICD-9-CM 342.80 (ot sp hmiplga unspf side) and 342.90 (unsp hemiplga unspf side). The mapping is approximate, so confirm the match fits the documentation.

Footnotes

[1] Chronic - a chronic condition code indicates a condition lasting 12 months or longer and its effect on the patient based on one or both of the following criteria:

  • The condition results in the need for ongoing intervention with medical products,treatment, services, and special equipment
  • The condition places limitations on self-care, independent living, and social interactions.