ICD-10-CM Tabular Index · Chapter 6 · FY 2027 G20–G26
Extrapyramidal and movement disorders (G20-G26) ICD-10-CM
The G20–G26 section covers extrapyramidal and movement disorders with 58 ICD-10-CM diagnosis codes, of which 46 are billable in fiscal year 2027. The section is organized into the 6 code ranges listed below.
✓ Built from the official CMS FY 2027 datasetEffective Oct 1, 2026 – Sep 30, 2027
The info icon previews the code ranges inside each row and its instructional notations from the official Tabular List.
About the G20–G26 Code Range
These nervous system conditions affect movement. They include Parkinson's disease, dystonia, tremor, and degenerative diseases of the basal ganglia. Parkinson's disease is progressive and can cause resting tremor, stiffness, and slow movement. Dystonia is a posture caused by opposing muscles contracting together.
G20 separates Parkinson's disease by whether dyskinesia is present and also includes unspecified parkinsonism. G21 groups secondary parkinsonism by cause, including drugs, other external agents, and vascular disease. G23 contains named degenerative diseases of the basal ganglia. G24 distinguishes drug-induced, genetic, and other forms of dystonia. G25 includes tremor, myoclonus, chorea, tics, and other movement disorders. G26 identifies movement disorders in diseases classified elsewhere.
Questions About This Page
How many codes are in the G20-G26 range?
The G20-G26 range contains 58 ICD-10-CM diagnosis codes in FY 2027. 46 of them are billable, and the rest are category headers that organize the section.
What conditions does G20-G26 cover?
The range covers extrapyramidal and movement disorders. The code ranges listed above break it into groups of related conditions, and each one links to its own page with the full code list.
These terms are the conditions for which that code is to be used. The terms may be synonyms of the code title, or, in the case of "other specified" codes, the terms are a list of the various conditions assigned to that code. The inclusion terms are not necessarily exhaustive. Additional terms found only in the Alphabetic Index may also be assigned to a code.
Hemiparkinsonism
Idiopathic Parkinsonism or Parkinson's disease
Paralysis agitans
Primary Parkinsonism or Parkinson's disease
Use Additional Code
The “use additional code” indicates that a secondary code could be used to further specify the patient’s condition. This note is not mandatory and is only used if enough information is available to assign an additional code.
A type 1 excludes note is a pure excludes note. It means "NOT CODED HERE!" An Excludes1 note indicates that the code excluded should never be used at the same time as the code above the Excludes1 note. An Excludes1 is used when two conditions cannot occur together, such as a congenital form versus an acquired form of the same condition.
A type 2 excludes note represents "Not included here". An excludes2 note indicates that the condition excluded is not part of the condition represented by the code, but a patient may have both conditions at the same time. When an Excludes2 note appears under a code, it is acceptable to use both the code and the excluded code together, when appropriate.
multi-system degeneration of the autonomic nervous system G90.3
This note appears immediately under a three character code title to further define, or give examples of, the content of the category.
dyskinesia
Type 2 Excludes
A type 2 excludes note represents "Not included here". An excludes2 note indicates that the condition excluded is not part of the condition represented by the code, but a patient may have both conditions at the same time. When an Excludes2 note appears under a code, it is acceptable to use both the code and the excluded code together, when appropriate.
A type 2 excludes note represents "Not included here". An excludes2 note indicates that the condition excluded is not part of the condition represented by the code, but a patient may have both conditions at the same time. When an Excludes2 note appears under a code, it is acceptable to use both the code and the excluded code together, when appropriate.
Certain conditions have both an underlying etiology and multiple body system manifestations due to the underlying etiology. For such conditions, the ICD-10-CM has a coding convention that requires the underlying condition be sequenced first followed by the manifestation. Wherever such a combination exists, there is a "use additional code" note at the etiology code, and a "code first" note at the manifestation code. These instructional notes indicate the proper sequencing order of the codes, etiology followed by manifestation.
