G12.21 – Amyotrophic lateral sclerosis
ICD-10-CM 2027 diagnosis code · Systemic atrophies primarily affecting the central nervous system
ICD-10-CM code
G12.21
- Code
G12.21(claims format:G1221)- Description
- Amyotrophic lateral sclerosis
- Billable
- Yes – valid for HIPAA-covered transactions
- Valid for
- Dates of service October 1, 2026 – September 30, 2027 (FY2027)
- Chapter
- 6. Diseases of the nervous system (G00-G99)
- Block
- G10-G14 Systemic atrophies primarily affecting the central nervous system
- Parent codes
- G12 › G12.2
Index terms for G12.21
Entries in the ICD-10-CM alphabetic index that lead to this code:
- Sclerosis, sclerotic, lateral
- Duchenne-Aran muscular atrophy
- Atrophy, atrophic, Duchenne-Aran
- Paralysis, paralytic, amyotrophic
- Sclerosis, sclerotic, amyotrophic
- Sclerosis, sclerotic, spinal, lateral
- Paralysis, paralytic, spinal, progressive
- Atrophy, atrophic, muscle, muscular, progressive
- Atrophy, atrophic, muscle, muscular, Duchenne-Aran
- Amyotrophia, amyotrophy, amyotrophic, lateral sclerosis
- Paralysis, paralytic, muscle, muscular NEC, progressive
- Atrophy, atrophic, muscle, muscular, spinal, Aran-Duchenne
- Disease, diseased, motor neuron, amyotrophic lateral sclerosis
Related codes in G12.2
Frequently asked questions
What is ICD-10 code G12.21?
G12.21 is the ICD-10-CM code for amyotrophic lateral sclerosis, in the block G10-G14 (Systemic atrophies primarily affecting the central nervous system).
Is G12.21 a billable code?
Yes. G12.21 is a billable/specific code that can be used to indicate a diagnosis for reimbursement purposes.
What category does G12.21 belong to?
It belongs to category G12 – Spinal muscular atrophy and related syndromes.
Source: CDC/NCHS ICD-10-CM FY2027 code files, tabular list and index. Reference only – code assignment must follow the official ICD-10-CM guidelines and documentation in the medical record.