2026 ICD-10-CM Diagnosis Code G83.12Monoplegia of lower limb affecting left dominant side

ICD-10-CM Codes›G00–G99›G80-G83›G83

ICD-10-CM G83.12
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

G83.12 is a billable ICD-10-CM diagnosis code for monoplegia of lower limb affecting left dominant side. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026). Coders also document this condition as monoplegia of left dominant lower limb. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Paralysis (other than cerebral palsy).

Code Identity

ICD-10-CM Code
G83.12
Billable Status
Yes — Valid for Submission
Code Describes
Monoplegia of lower limb affecting left dominant side
Short Description
Monoplegia of lower limb affecting left dominant side
Same as the full description in the CMS dataset.
Parent Code
G83.1
Monoplegia of lower limb

Code Classification

ChapterG00–G99Diseases of the nervous system
SectionG80-G83Cerebral palsy and other paralytic syndromes
CategoryG83Other paralytic syndromes
This CodeG83.12Monoplegia of lower limb affecting left dominant side

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Monoplegia of left dominant lower limb
  • Monoplegia of lower limb affecting dominant side

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

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 G83.12 to ICD-9-CMHistory

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

ICD-9-CM
344.31 Monplga lwr lmb dmnt sde
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 G83.12Overview

Is G83.12 (Monoplegia of lower limb) a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report monoplegia of lower limb affecting left dominant side on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

What is the ICD-9 equivalent of G83.12?

Under the General Equivalence Mappings, monoplegia of lower limb affecting left dominant side converts to ICD-9-CM 344.31 (monplga lwr lmb dmnt sde). 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.