G12.21 ICD-10-CM Code: Amyotrophic lateral sclerosis
A clear reference for the official code description, hierarchy, and related coding information from the FY 2027 U.S. release.
Code definition
Official description
G12.21Amyotrophic lateral sclerosis
ICD-10-CM diagnosis code · United States clinical modification
Classification
Where G12.21 sits
- 1
Chapter 6
Diseases of the nervous system (G00-G99)
- 2
Section
Systemic atrophies primarily affecting the central nervous system (G10-G14)
- 3
Category G12
Spinal muscular atrophy and related syndromes
- 4
Subcategory G12.2
Motor neuron disease
- 5
Code G12.21
Amyotrophic lateral sclerosis
Documentation details
Notes for this code
Inclusion terms
No inclusion terms are listed for G12.21.
Code first
No “code first” instruction is listed for G12.21.
Use additional code
No “use additional code” instruction is listed for G12.21.
Excludes1
Conditions that should not be reported together with this code.
No Excludes1 note is listed for G12.21.
Excludes2
Conditions not included here that may be reported separately when present.
No Excludes2 note is listed for G12.21.
Transparency
Source and release
This reference is generated from Vero’s ICD-10-CM description, hierarchy, and code-note dataset. The visible content and structured data share that source.
Review the CDC/NCHS ICD-10-CM sourceCode-specific guidance
Frequently asked questions
What does ICD-10-CM code G12.21 mean?
G12.21 is the FY 2027 U.S. ICD-10-CM code for “Amyotrophic lateral sclerosis.”
Is G12.21 a billable or specific ICD-10-CM code?
Yes. In the FY 2027 reference data used on this page, G12.21 has no child codes and is presented as a billable/specific code. Always confirm the active code set and payer requirements before use.
Where is G12.21 located in ICD-10-CM?
G12.21 is listed in Chapter 6, Diseases of the nervous system (G00-G99), within Systemic atrophies primarily affecting the central nervous system (G10-G14) (G10–G14), under category G12, Spinal muscular atrophy and related syndromes and subcategory G12.2, Motor neuron disease.
What coding notes are listed for G12.21?
No inclusion terms are listed for G12.21 in this reference record. No code-first instruction is listed. No Excludes1 note is listed. No Excludes2 note is listed.
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