U.S. category index · FY 2027

G ICD-10-CM Categories: Category Index

Browse 68 top-level ICD-10-CM categories beginning with G, then follow their complete FY 2027 child-code hierarchies.

Complete category list

Categories beginning with G

Open a category to continue through its complete hierarchy of more specific codes.

G00

Bacterial meningitis, not elsewhere classified

G01

Meningitis in bacterial diseases classified elsewhere

G02

Meningitis in other infectious and parasitic diseases classified elsewhere

G03

Meningitis due to other and unspecified causes

G04

Encephalitis, myelitis and encephalomyelitis

G05

Encephalitis, myelitis and encephalomyelitis in diseases classified elsewhere

G06

Intracranial and intraspinal abscess and granuloma

G07

Intracranial and intraspinal abscess and granuloma in diseases classified elsewhere

G08

Intracranial and intraspinal phlebitis and thrombophlebitis

G09

Sequelae of inflammatory diseases of central nervous system

G10

Huntington's disease

G11

Hereditary ataxia

G12

Spinal muscular atrophy and related syndromes

G13

Systemic atrophies primarily affecting central nervous system in diseases classified elsewhere

G14

Postpolio syndrome

G20

Parkinson's disease

G21

Secondary parkinsonism

G23

Other degenerative diseases of basal ganglia

G24

Dystonia

G25

Other extrapyramidal and movement disorders

G26

Extrapyramidal and movement disorders in diseases classified elsewhere

G30

Alzheimer's disease

G31

Other degenerative diseases of nervous system, not elsewhere classified

G32

Other degenerative disorders of nervous system in diseases classified elsewhere

G35

Multiple sclerosis

G36

Other acute disseminated demyelination

G37

Other demyelinating diseases of central nervous system

G40

Epilepsy and recurrent seizures

G43

Migraine

G44

Other headache syndromes

G45

Transient cerebral ischemic attacks and related syndromes

G46

Vascular syndromes of brain in cerebrovascular diseases

G47

Sleep disorders

G50

Disorders of trigeminal nerve

G51

Facial nerve disorders

G52

Disorders of other cranial nerves

G53

Cranial nerve disorders in diseases classified elsewhere

G54

Nerve root and plexus disorders

G55

Nerve root and plexus compressions in diseases classified elsewhere

G56

Mononeuropathies of upper limb

G57

Mononeuropathies of lower limb

G58

Other mononeuropathies

G59

Mononeuropathy in diseases classified elsewhere

G60

Hereditary and idiopathic neuropathy

G61

Inflammatory polyneuropathy

G62

Other and unspecified polyneuropathies

G63

Polyneuropathy in diseases classified elsewhere

G64

Other disorders of peripheral nervous system

G65

Sequelae of inflammatory and toxic polyneuropathies

G70

Myasthenia gravis and other myoneural disorders

G71

Primary disorders of muscles

G72

Other and unspecified myopathies

G73

Disorders of myoneural junction and muscle in diseases classified elsewhere

G80

Cerebral palsy

G81

Hemiplegia and hemiparesis

G82

Paraplegia (paraparesis) and quadriplegia (quadriparesis)

G83

Other paralytic syndromes

G89

Pain, not elsewhere classified

G90

Disorders of autonomic nervous system

G91

Hydrocephalus

G92

Toxic encephalopathy

G93

Other disorders of brain

G94

Other disorders of brain in diseases classified elsewhere

G95

Other and unspecified diseases of spinal cord

G96

Other disorders of central nervous system

G97

Intraoperative and postprocedural complications and disorders of nervous system, not elsewhere classified

G98

Other disorders of nervous system not elsewhere classified

G99

Other disorders of nervous system in diseases classified elsewhere

Transparency

Source and release

Data release

U.S. ICD-10-CM · FY 2027

Effective date

Oct 1, 2026

This category index is generated from Vero’s repository-backed ICD-10-CM hierarchy. Every listed category is a top-level record, and each linked category page exposes its direct child codes.

Review the CDC/NCHS ICD-10-CM source

Category navigation

Frequently asked questions

Which ICD-10-CM categories begin with G?

This index lists 68 top-level categories beginning with G from Vero’s FY 2027 U.S. ICD-10-CM reference dataset.

How do I find a more specific G code?

Open a category below, then follow its linked child-code hierarchy until you reach the code supported by the documentation.

Which ICD-10-CM release does this G index use?

The index uses the FY 2027 U.S. ICD-10-CM release and the repository-backed hierarchy displayed on each linked code page.

Is every G category billable?

No. These are top-level categories used for navigation. Follow the hierarchy to a sufficiently specific code and confirm the active code set, official guidance, and payer requirements.

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