2027 ICD-10-CM Diagnosis Code G13Systemic atrophies primarily affecting central nervous system in diseases classified elsewhere

ICD-10-CM Codes›G00–G99›G10-G14›G13

ICD-10-CM G13
CMSSource: CMS FY 2027 ICD-10-CM dataset · Effective Oct 1, 2026 – Sep 30, 2027

G13 is a non-billable ICD-10-CM category code for systemic atrophies primarily affecting central nervous system in diseases classified elsewhere, so it cannot be submitted on claims. Use a more specific code from this category instead, such as G13.0, G13.1, G13.2, and G13.8.

Code Identity

ICD-10-CM Code
G13
Billable Status
No — Non-Billable Category
Code Describes
Systemic atrophies primarily affecting central nervous system in diseases classified elsewhere
Short Description
Systemic atrophies aff cnsl in diseases classd elswhr
Chapter
G10-G14
Systemic atrophies primarily affecting the central nervous system

Code Classification

ChapterG00–G99Diseases of the nervous system
SectionG10-G14Systemic atrophies primarily affecting the central nervous system
CategoryG13Systemic atrophies primarily affecting central nervous system in diseases classified elsewhere
This CodeG13Systemic atrophies primarily affecting central nervous system in diseases classified elsewhere

Specific Coding for Systemic atrophies aff cnsl in diseases classd elswhrOverview

Non-specific codes like G13 require more characters. Use one of these billable codes instead:

  • Use G13.0 for Paraneoplastic neuromyopathy and neuropathy

  • Use G13.1 for Other systemic atrophy primarily affecting central nervous system in neoplastic disease

  • Use G13.2 for Systemic atrophy primarily affecting the central nervous system in myxedema

  • Use G13.8 for Systemic atrophy primarily affecting central nervous system in other diseases classified elsewhere

Instructional NotesGuidance

Instructions from the official ICD-10-CM Tabular List that apply to G13: its own notes plus those printed at Chapter 6. A note printed at a category, block or chapter applies to every code under it.

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.

From Chapter 6 (G00-G99) Diseases of the nervous system applies to 700 codes
  • certain conditions originating in the perinatal period (P04-P96)
  • certain infectious and parasitic diseases (A00-B99)
  • complications of pregnancy, childbirth and the puerperium (O00-O9A)
  • congenital malformations, deformations, and chromosomal abnormalities (Q00-Q99)
  • endocrine, nutritional and metabolic diseases (E00-E88)
  • injury, poisoning and certain other consequences of external causes (S00-T88)
  • neoplasms (C00-D49)
  • symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R94)

Source: CMS ICD-10-CM Tabular List. How to read instructional notes.

Patient EducationClinical

Brain Diseases

Your brain is the control center of your body. It controls your thoughts, memory, speech, and movement. It regulates the function of many organs. It's part of your nervous system, which also includes your spinal cord and peripheral nerves. The nervous system sends signals between your brain and the rest of the body.

Read the full article at MedlinePlus

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

Code HistoryHistory

FY 2016AddedAdded to the ICD-10-CM code setEffective October 1, 2015, the first year of ICD-10-CM.
FY 2017–2026No changes
FY 2027CurrentCurrent code set, no changesEffective October 1, 2026 through September 30, 2027.

Questions About G13Overview

Is G13 a billable code?

No. This is a category header that groups the codes for systemic atrophies primarily affecting central nervous system in diseases classified elsewhere, and headers cannot be submitted on claims. Claims for systemic atrophies primarily affecting central nervous system in diseases classified elsewhere need a more specific code from this category, such as G13.0, G13.1, and G13.2.