2026 ICD-10-CM Diagnosis Code G99.2Myelopathy in diseases classified elsewhere

ICD-10-CM Codes›G00–G99›G89-G99›G99

ICD-10-CM G99.2
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

G99.2 is a billable ICD-10-CM diagnosis code for myelopathy in diseases classified elsewhere. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026). The code is a manifestation code that cannot be reported as the principal diagnosis. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Other nervous system disorders (often hereditary or degenerative).

Code Identity

ICD-10-CM Code
G99.2
Billable Status
Yes — Valid for Submission
Code Describes
Myelopathy in diseases classified elsewhere
Short Description
Myelopathy in diseases classified elsewhere
Same as the full description in the CMS dataset.
Parent Code
G99
Other disorders of nervous system in diseases classified elsewhere

Code Classification

ChapterG00–G99Diseases of the nervous system
SectionG89-G99Other disorders of the nervous system
CategoryG99Other disorders of nervous system in diseases classified elsewhere
This CodeG99.2Myelopathy in diseases classified elsewhere

Code EditsBilling

Medicare Code Editor checks that affect claim validity for G99.2.

Manifestation diagnoses
Manifestation codes describe the manifestation of an underlying disease, not the disease itself, and therefore should not be used as a principal diagnosis.

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Central cord syndrome due to neoplasm
  • Central cord syndrome due to syringomyelia
  • Cervical myelopathy
  • Disorder of spinal cord co-occurrent with human immunodeficiency virus infection
  • Myelopathy due to another disorder
  • Myelopathy due to benign neoplastic disease
  • Myelopathy due to copper deficiency
  • Myelopathy due to fluorosis
  • Myelopathy due to folate deficiency
  • Myelopathy due to liver disease
  • Myelopathy due to malignant neoplastic disease
  • Myelopathy due to metabolic disorder
  • Myelopathy due to neoplastic disease
  • Myelopathy due to nutritional deficiency
  • Myelopathy due to obesity
  • Myelopathy due to vitamin B12 deficiency
  • Myelopathy with AIDS
  • Neurological disorder due to obesity
  • Spinal stenosis in cervical region
  • Spinal stenosis in cervical region with myelopathy
  • Syringomyelia
  • Vacuolar myelopathy

Tabular List NotesGuidance

Coding notes and annotation back-references applicable to this code.

Code First

  • underlying disease, such as:
  • neoplasm C00 D49

Type 1 Excludes

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.

    • Myelopathy(spinal cord)
      • in (due to)
        • disease classified elsewhere

Clinical ClassificationClinical

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

CCSR NVS006
Other nervous system disorders (often hereditary or degenerative)
Default principal diagnosis: inpatient No · outpatient No

Clinical InformationClinical

  • Syringomyelia

    longitudinal cavities in the spinal cord, most often in the cervical region, which may extend for multiple spinal levels. the cavities are lined by dense, gliogenous tissue and may be associated with spinal cord neoplasms; spinal cord traumatic injuries; and vascular malformations. syringomyelia is marked clinically by pain and paresthesia, muscular atrophy of the hands, and analgesia with thermoanesthesia of the hands and arms, but with the tactile sense preserved (sensory dissociation). lower extremity spasticity and incontinence may also develop. (from adams et al., principles of neurology, 6th ed, p1269)

Patient EducationClinical

Spinal Cord Diseases

Your spinal cord is a bundle of nerves that runs down the middle of your back. It carries signals back and forth between your body and your brain. It is protected by your vertebrae, which are the bone disks that make up your spine.

Read the full article at MedlinePlus

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

Convert G99.2 to ICD-9-CMHistory

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

ICD-9-CM
336.3 Myelopathy in oth dis
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 G99.2Overview

Is G99.2 a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report myelopathy in diseases classified elsewhere on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

Can G99.2 be a principal diagnosis?

No. This is a manifestation code: myelopathy in diseases classified elsewhere describes the manifestation of an underlying disease rather than the disease itself, so the underlying condition is sequenced first.

What is the ICD-9 equivalent of G99.2?

Under the General Equivalence Mappings, myelopathy in diseases classified elsewhere converts to ICD-9-CM 336.3 (myelopathy in oth dis). 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.