2026 ICD-10-CM Diagnosis Code G83.83Posterior cord syndrome

ICD-10-CM Codes›G00–G99›G80-G83›G83

ICD-10-CM G83.83
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

G83.83 is a billable ICD-10-CM diagnosis code for posterior cord syndrome. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026). In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Paralysis (other than cerebral palsy).

Code Identity

ICD-10-CM Code
G83.83
Billable Status
Yes — Valid for Submission
Code Describes
Posterior cord syndrome
Short Description
Posterior cord syndrome
Same as the full description in the CMS dataset.
Parent Code
G83.8
Other specified paralytic syndromes

Code Classification

ChapterG00–G99Diseases of the nervous system
SectionG80-G83Cerebral palsy and other paralytic syndromes
CategoryG83Other paralytic syndromes
This CodeG83.83Posterior cord syndrome

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Cerebellar ataxia associated with another disorder
  • Demyelination of spinal cord
  • Friedreich ataxia
  • Multiple sclerosis of the spinal cord
  • Posterior cord syndrome
  • Posterior cord syndrome due to cervical spondylosis
  • Posterior cord syndrome due to Friedreich ataxia
  • Posterior cord syndrome due to multiple sclerosis
  • Posterior cord syndrome due to neoplasm
  • Posterior cord syndrome due to tabetic neurosyphilis
  • Posterior cord syndrome due to vascular malformation
  • Tabetic neurosyphilis
  • Traumatic posterior cord syndrome

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.

    • Syndrome
      • cord
        • posterior
    • Syndrome
      • posterior
        • cord

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

  • Frataxin

    a protein involved in the transfer of iron and sulfur to iron-sulfur cluster (isc) assembly complex for de novo synthesis of a [2fe-2s] cluster, the first step of the mitochondrial iron-sulfur protein biogenesis. deficiency leads to the neurodegenerative disease friedreich ataxia.

  • Friedreich Ataxia

    an autosomal recessive disease, usually of childhood onset, characterized pathologically by degeneration of the spinocerebellar tracts, posterior columns, and to a lesser extent the corticospinal tracts. clinical manifestations include gait ataxia, pes cavus, speech impairment, lateral curvature of spine, rhythmic head tremor, kyphoscoliosis, congestive heart failure (secondary to a cardiomyopathy), and lower extremity weakness. most forms of this condition are associated with a mutation in a gene on chromosome 9, at band q13, which codes for the mitochondrial protein frataxin. (from adams et al., principles of neurology, 6th ed, p1081; n engl j med 1996 oct 17;335(16):1169-75) the severity of friedreich ataxia associated with expansion of gaa repeats in the first intron of the frataxin gene correlates with the number of trinucleotide repeats. (from durr et al, n engl j med 1996 oct 17;335(16):1169-75)

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 G83.83 to ICD-9-CMHistory

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

ICD-9-CM
344.89 Oth spcf paralytic synd
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 G83.83Overview

Is G83.83 (Other specified paralytic syndromes) a billable code?

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

What is the ICD-9 equivalent of G83.83?

Under the General Equivalence Mappings, posterior cord syndrome converts to ICD-9-CM 344.89 (oth spcf paralytic synd). 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.