ICD-10-CM Excludes1 Notes · Chapter 6 · FY 2027 G00-G99

Excludes1 Notes in Chapter 6: Diseases of the nervous system ICD-10-CM

An Excludes1 note means "NOT CODED HERE": the excluded code should never be reported together with the code above the note. In Chapter 6 (G00-G99), notes printed in the chapter name other codes 325 times, and Excludes1 Notes anywhere in the Tabular List name the chapter’s codes 179 times, covering 114 distinct codes, categories and ranges. Switch views to read the list either way.

✓ From the official FY 2027 ICD-10-CM Tabular ListDefinitions follow the Official Guidelines, Section I.A
325
References in Its Notes
179
References to Its Codes
114
Chapter Codes Named
G00-G99
Chapter 6
Chapter 6

Excludes1 Notes by the code that carries the note

102 of 102 shown
  • G00 Bacterial meningitis, not elsewhere classified applies to 6 codes
    • bacterial meningoencephalitis (G04.2)
    • bacterial meningomyelitis (G04.2)
  • G01 Meningitis in bacterial diseases classified elsewhere
    • gonococcal (A54.81)
    • leptospirosis (A27.81)
    • listeriosis (A32.11)
    • Lyme disease (A69.21)
    • meningococcal (A39.0)
    • neurosyphilis (A52.13)
    • tuberculosis (A17.0)
    • meningoencephalitis and meningomyelitis in bacterial diseases classified elsewhere (G05)
  • G02 Meningitis in other infectious and parasitic diseases classified elsewhere
    • candidal meningitis (B37.5)
    • coccidioidomycosis meningitis (B38.4)
    • cryptococcal meningitis (B45.1)
    • herpesviral [herpes simplex] meningitis (B00.3)
    • infectious mononucleosis complicated by meningitis (B27.- with fifth character 2)
    • measles complicated by meningitis (B05.1)
    • meningoencephalitis and meningomyelitis in other infectious and parasitic diseases classified elsewhere (G05)
    • mumps meningitis (B26.1)
    • rubella meningitis (B06.02)
    • varicella [chickenpox] meningitis (B01.0)
    • zoster meningitis (B02.1)
  • G03 Meningitis due to other and unspecified causes applies to 5 codes
    • meningoencephalitis (G04.-)
    • meningomyelitis (G04.-)
  • G04 Encephalitis, myelitis and encephalomyelitis applies to 14 codes
  • G04.0 Acute disseminated encephalitis and encephalomyelitis (ADEM) applies to 3 codes
    • acute necrotizing hemorrhagic encephalopathy (G04.3-)
    • other noninfectious acute disseminated encephalomyelitis (noninfectious ADEM) (G04.81)
  • G04.01 Postinfectious acute disseminated encephalitis and encephalomyelitis (postinfectious ADEM)
    • post chickenpox encephalitis (B01.1)
    • post measles encephalitis (B05.0)
    • post measles myelitis (B05.1)
  • G04.3 Acute necrotizing hemorrhagic encephalopathy applies to 4 codes
    • acute disseminated encephalitis and encephalomyelitis (G04.0-)
  • G04.82 Acute flaccid myelitis
    • transverse myelitis (G37.3)
  • G05 Encephalitis, myelitis and encephalomyelitis in diseases classified elsewhere applies to 2 codes
    • adenoviral encephalitis, myelitis and encephalomyelitis (A85.1)
    • encephalitis, myelitis and encephalomyelitis (in) measles (B05.0)
    • enteroviral encephalitis, myelitis and encephalomyelitis (A85.0)
    • herpesviral [herpes simplex] encephalitis, myelitis and encephalomyelitis (B00.4)
    • listerial encephalitis, myelitis and encephalomyelitis (A32.12)
    • meningococcal encephalitis, myelitis and encephalomyelitis (A39.81)
    • mumps encephalitis, myelitis and encephalomyelitis (B26.2)
    • postchickenpox encephalitis, myelitis and encephalomyelitis (B01.1-)
    • rubella encephalitis, myelitis and encephalomyelitis (B06.01)
    • toxoplasmosis encephalitis, myelitis and encephalomyelitis (B58.2)
    • zoster encephalitis, myelitis and encephalomyelitis (B02.0)
  • G06.0 Intracranial abscess and granuloma
    • tuberculous intracranial abscess and granuloma (A17.81)
  • G06.1 Intraspinal abscess and granuloma
    • tuberculous intraspinal abscess and granuloma (A17.81)
  • G07 Intracranial and intraspinal abscess and granuloma in diseases classified elsewhere
  • G08 Intracranial and intraspinal phlebitis and thrombophlebitis
    • abortion, ectopic or molar pregnancy (O00-O07, O08.7)
    • pregnancy, childbirth and the puerperium (O22.5, O87.3)
    • nonpyogenic intracranial phlebitis and thrombophlebitis (I67.6)
  • G14 Postpolio syndrome
    • sequelae of poliomyelitis (B91)
  • G20.B Parkinson's disease with dyskinesia applies to 2 codes
    • drug induced dystonia (G24.0-)
  • G20.C Parkinsonism, unspecified
    • Parkinson's disease NOS (G20.A1)
    • Parkinson's disease with dyskinesia (G20.B-)
    • Parkinson's disease without dyskinesia (G20.A-)
    • secondary parkinsonism (G21.-)
  • G21 Secondary parkinsonism applies to 8 codes
    • Huntington's disease (G10)
    • neurocognitive disorder with Lewy bodies (G31.83)
    • Shy-Drager syndrome (G90.3)
    • syphilitic Parkinsonism (A52.19)
  • G21.0 Malignant neuroleptic syndrome
    • neuroleptic induced parkinsonism (G21.11)
  • G21.11 Neuroleptic induced parkinsonism
    • malignant neuroleptic syndrome (G21.0)
  • G24.3 Spasmodic torticollis
    • congenital torticollis (Q68.0)
    • hysterical torticollis (F44.4)
    • ocular torticollis (R29.891)
    • psychogenic torticollis (F45.8)
    • torticollis NOS (M43.6)
    • traumatic recurrent torticollis (S13.4)
  • G24.4 Idiopathic orofacial dystonia
    • drug induced orofacial dyskinesia (G24.01)
  • G24.5 Blepharospasm
    • drug induced blepharospasm (G24.01)
  • G25.0 Essential tremor
  • G25.3 Myoclonus
  • G25.5 Other chorea
    • chorea NOS with heart involvement (I02.0)
    • Huntington's chorea (G10)
    • rheumatic chorea (I02.-)
    • Sydenham's chorea (I02.-)
  • G25.69 Other tics of organic origin
  • G30 Alzheimer's disease applies to 4 codes
    • senile degeneration of brain NEC (G31.1)
    • senile dementia NOS (F03.-)
    • senility NOS (R41.81)
  • G31.1 Senile degeneration of brain, not elsewhere classified
  • G31.84 Mild cognitive impairment of uncertain or unknown etiology
    • age related cognitive decline (R41.81)
    • altered mental status (R41.82)
    • cerebral degeneration (G31.9)
    • cerebrovascular diseases (I60-I69)
    • change in mental status (R41.82)
    • cognitive deficits following (sequelae of) cerebral hemorrhage or infarction (I69.01-, I69.11-, I69.21-, I69.31-, I69.81-, I69.91-)
    • cognitive impairment due to intracranial or head injury (S06.-)
    • dementia (F01.-, F02.-, F03.-)
    • mild neurocognitive disorder due to a known physiological condition (F06.7-)
    • neurologic neglect syndrome (R41.4)
    • personality change, nonpsychotic (F68.8)
  • G32.0 Subacute combined degeneration of spinal cord in diseases classified elsewhere
    • syphilitic combined degeneration of spinal cord (A52.11)
  • G32.8 Other specified degenerative disorders of nervous system in diseases classified elsewhere applies to 2 codes
    • superior hemorrhagic polioencephalitis [Wernicke's encephalopathy] (E51.2)
  • G32.81 Cerebellar ataxia in diseases classified elsewhere
    • systemic atrophy primarily affecting the central nervous system in alcoholic cerebellar ataxia (G31.2)
    • systemic atrophy primarily affecting the central nervous system in myxedema (G13.2)
  • G35.A Relapsing-remitting multiple sclerosis
    • demyelinating disease of central nervous system, unspecified (G37.9)
  • G36 Other acute disseminated demyelination applies to 4 codes
    • postinfectious encephalitis and encephalomyelitis NOS (G04.01)
  • G37.0 Diffuse sclerosis of central nervous system
    • X linked adrenoleukodystrophy (E71.52-)
  • G37.3 Acute transverse myelitis in demyelinating disease of central nervous system
    • acute flaccid myelitis (G04.82)
    • multiple sclerosis (G35-)
    • neuromyelitis optica [Devic] (G36.0)
  • G40 Epilepsy and recurrent seizures applies to 58 codes
    • conversion disorder with seizures (F44.5)
    • convulsions NOS (R56.9)
    • post traumatic seizures (R56.1)
    • seizure (convulsive) NOS (R56.9)
    • seizure of newborn (P90)
  • G40.0 Localization-related (focal) (partial) idiopathic epilepsy and epileptic syndromes with seizures of localized onset applies to 4 codes
  • G40.89 Other seizures
  • G43 Migraine applies to 48 codes
  • G43.0 Migraine without aura applies to 4 codes
    • chronic migraine without aura (G43.7-)
  • G43.1 Migraine with aura applies to 4 codes
  • G43.7 Chronic migraine without aura applies to 4 codes
    • migraine without aura (G43.0-)
  • G43.A Cyclical vomiting applies to 2 codes
    • cyclical vomiting syndrome unrelated to migraine (R11.15)
  • G43.E Chronic migraine with aura applies to 4 codes
  • G44 Other headache syndromes applies to 40 codes
  • G45 Transient cerebral ischemic attacks and related syndromes applies to 7 codes
    • neonatal cerebral ischemia (P91.0)
    • transient retinal artery occlusion (H34.0-)
  • G45.4 Transient global amnesia
  • G47.3 Sleep apnea applies to 9 codes
  • G47.33 Obstructive sleep apnea (adult) (pediatric)
    • obstructive sleep apnea of newborn (P28.3-)
  • G47.5 Parasomnia applies to 6 codes
  • G47.63 Sleep related bruxism
    • psychogenic bruxism (F45.8)
  • Block note Block G50-G59 Nerve, nerve root and plexus disorders applies to 106 codes
  • G51.1 Geniculate ganglionitis
    • postherpetic geniculate ganglionitis (B02.21)
  • G53 Cranial nerve disorders in diseases classified elsewhere
    • multiple cranial nerve palsy in sarcoidosis (D86.82)
    • multiple cranial nerve palsy in syphilis (A52.15)
    • postherpetic geniculate ganglionitis (B02.21)
    • postherpetic trigeminal neuralgia (B02.22)
  • G54 Nerve root and plexus disorders applies to 10 codes
    • intervertebral disc disorders (M50-M51)
    • neuralgia or neuritis NOS (M79.2)
    • neuritis or radiculitis brachial NOS (M54.13)
    • neuritis or radiculitis lumbar NOS (M54.16)
    • neuritis or radiculitis lumbosacral NOS (M54.17)
    • neuritis or radiculitis thoracic NOS (M54.14)
    • radiculitis NOS (M54.10)
    • radiculopathy NOS (M54.10)
    • spondylosis (M47.-)
  • G54.5 Neuralgic amyotrophy
    • neuralgic amyotrophy in diabetes mellitus (E08-E13 with .44)
  • G55 Nerve root and plexus compressions in diseases classified elsewhere
    • nerve root compression (due to) (in) ankylosing spondylitis (M45.-)
    • nerve root compression (due to) (in) dorsopathies (M53.-, M54.-)
    • nerve root compression (due to) (in) intervertebral disc disorders (M50.1.-, M51.1.-)
    • nerve root compression (due to) (in) spondylopathies (M46.-, M48.-)
    • nerve root compression (due to) (in) spondylosis (M47.0-, M47.2.-)
  • G56.4 Causalgia of upper limb applies to 4 codes
    • complex regional pain syndrome I of lower limb (G90.52-)
    • complex regional pain syndrome I of upper limb (G90.51-)
    • complex regional pain syndrome II of lower limb (G57.7-)
    • reflex sympathetic dystrophy of lower limb (G90.52-)
    • reflex sympathetic dystrophy of upper limb (G90.51-)
  • G57.0 Lesion of sciatic nerve applies to 4 codes
  • G57.7 Causalgia of lower limb applies to 4 codes
    • complex regional pain syndrome I of lower limb (G90.52-)
    • complex regional pain syndrome I of upper limb (G90.51-)
    • complex regional pain syndrome II of upper limb (G56.4-)
    • reflex sympathetic dystrophy of lower limb (G90.52-)
    • reflex sympathetic dystrophy of upper limb (G90.51-)
  • G59 Mononeuropathy in diseases classified elsewhere
    • diabetic mononeuropathy (E08-E13 with .41)
    • syphilitic nerve paralysis (A52.19)
    • syphilitic neuritis (A52.15)
    • tuberculous mononeuropathy (A17.83)
  • Block note Block G60-G65 Polyneuropathies and other disorders of the peripheral nervous system applies to 24 codes
  • G63 Polyneuropathy in diseases classified elsewhere
  • G70 Myasthenia gravis and other myoneural disorders applies to 8 codes
  • G70.81 Lambert-Eaton syndrome in disease classified elsewhere
    • Lambert-Eaton syndrome in neoplastic disease (G73.1)
  • G71.3 Mitochondrial myopathy, not elsewhere classified
    • Kearns-Sayre syndrome (H49.81)
    • Leber's disease (H47.21)
    • Leigh's encephalopathy (G31.82)
    • mitochondrial metabolism disorders (E88.4.-)
    • Reye's syndrome (G93.7)
  • G72 Other and unspecified myopathies applies to 9 codes
    • arthrogryposis multiplex congenita (Q74.3)
    • dermatopolymyositis (M33.-)
    • ischemic infarction of muscle (M62.2-)
    • myositis (M60.-)
    • polymyositis (M33.2.-)
  • G72.3 Periodic paralysis
    • paramyotonia congenita (of von Eulenburg) (G71.19)
  • G73.1 Lambert-Eaton syndrome in neoplastic disease
    • Lambert-Eaton syndrome not associated with neoplasm (G70.80-G70.81)
  • G73.7 Myopathy in diseases classified elsewhere
  • G80 Cerebral palsy applies to 7 codes
    • hereditary spastic paraplegia (G11.4)
  • G81 Hemiplegia and hemiparesis applies to 15 codes
  • G82 Paraplegia (paraparesis) and quadriplegia (quadriparesis) applies to 8 codes
    • congenital cerebral palsy (G80.-)
    • functional quadriplegia (R53.2)
    • hysterical paralysis (F44.4)
  • G83.1 Monoplegia of lower limb applies to 5 codes
  • G83.2 Monoplegia of upper limb applies to 5 codes
  • G83.4 Cauda equina syndrome
    • cord bladder NOS (G95.89)
    • neurogenic bladder NOS (N31.9)
  • G83.8 Other specified paralytic syndromes applies to 5 codes
    • paralytic syndromes due to current spinal cord injury-code to spinal cord injury (S14, S24, S34)
  • G89 Pain, not elsewhere classified applies to 10 codes
    • generalized pain NOS (R52)
    • pain disorders exclusively related to psychological factors (F45.41)
    • pain NOS (R52)
  • G89.2 Chronic pain, not elsewhere classified applies to 4 codes
    • causalgia, lower limb (G57.7-)
    • causalgia, upper limb (G56.4-)
    • central pain syndrome (G89.0)
    • chronic pain syndrome (G89.4)
    • complex regional pain syndrome II, lower limb (G57.7-)
    • complex regional pain syndrome II, upper limb (G56.4-)
    • neoplasm related chronic pain (G89.3)
    • reflex sympathetic dystrophy (G90.5-)
  • G90 Disorders of autonomic nervous system applies to 21 codes
    • dysfunction of the autonomic nervous system due to alcohol (G31.2)
  • G90.3 Multi-system degeneration of the autonomic nervous system
    • orthostatic hypotension NOS (I95.1)
  • G90.5 Complex regional pain syndrome I (CRPS I) applies to 10 codes
    • causalgia of lower limb (G57.7-)
    • causalgia of upper limb (G56.4-)
    • complex regional pain syndrome II of lower limb (G57.7-)
    • complex regional pain syndrome II of upper limb (G56.4-)
  • G91 Hydrocephalus applies to 7 codes
    • Arnold-Chiari syndrome with hydrocephalus (Q07.-)
    • congenital hydrocephalus (Q03.-)
    • spina bifida with hydrocephalus (Q05.-)
  • G91.4 Hydrocephalus in diseases classified elsewhere
    • hydrocephalus due to congenital toxoplasmosis (P37.1)
  • G93.0 Cerebral cysts
    • acquired periventricular cysts of newborn (P91.1)
    • congenital cerebral cysts (Q04.6)
  • G93.1 Anoxic brain damage, not elsewhere classified
    • cerebral anoxia due to anesthesia during labor and delivery (O74.3)
    • cerebral anoxia due to anesthesia during the puerperium (O89.2)
    • neonatal anoxia (P84)
  • G93.2 Benign intracranial hypertension
    • hypertensive encephalopathy (I67.4)
    • obstructive hydrocephalus (G91.1)
  • G93.3 Postviral and related fatigue syndromes applies to 3 codes
  • G93.5 Compression of brain
    • traumatic compression of brain (S06.A-)
  • G93.6 Cerebral edema
    • cerebral edema due to birth injury (P11.0)
    • traumatic cerebral edema (S06.1-)
  • G94 Other disorders of brain in diseases classified elsewhere
    • encephalopathy in congenital syphilis (A50.49)
    • encephalopathy in influenza (J09.X9, J10.81, J11.81)
    • encephalopathy in syphilis (A52.19)
    • hydrocephalus in diseases classified elsewhere (G91.4)
  • G95.8 Other specified diseases of spinal cord applies to 2 codes
    • neurogenic bladder NOS (N31.9)
    • neurogenic bladder due to cauda equina syndrome (G83.4)
    • neuromuscular dysfunction of bladder without spinal cord lesion (N31.-)
  • G95.89 Other specified diseases of spinal cord
  • G96.0 Cerebrospinal fluid leak applies to 5 codes
    • cerebrospinal fluid leak from spinal puncture (G97.0)
  • G96.11 Dural tear
    • accidental puncture or laceration of dura during a procedure (G97.41)
  • G97.3 Intraoperative hemorrhage and hematoma of a nervous system organ or structure complicating a procedure applies to 2 codes
    • intraoperative hemorrhage and hematoma of a nervous system organ or structure due to accidental puncture and laceration during a procedure (G97.4-)
  • G98.0 Neurogenic arthritis, not elsewhere classified
    • syringomyelia and syringobulbia (G95.0)
    • tabes dorsalis (A52.11)
  • G99.0 Autonomic neuropathy in diseases classified elsewhere
    • diabetic autonomic neuropathy (E08-E13 with .43)
  • G99.2 Myelopathy in diseases classified elsewhere
  • G99.8 Other specified disorders of nervous system in diseases classified elsewhere

The first view lists notes printed in this chapter (a note on a category or block applies to every code beneath it). The second lists codes of this chapter named by Excludes1 Notes anywhere in the Tabular List, including notes in other chapters.

Questions About Excludes1 Notes

What does an Excludes1 note mean?

An Excludes1 note means “NOT CODED HERE!”: the excluded code should never be used at the same time as the code above the note. It is used when two conditions cannot occur together, such as a congenital form versus an acquired form of the same condition (Section I.A.12.a). The FY 2027 Tabular List has 5,411 of them; 5,284 name other codes, with 5,710 references to 3,528 distinct codes, categories and ranges.

Is there any exception to an Excludes1 note?

Yes: when the two conditions are unrelated to each other. The Guidelines’ example is F45.8, whose Excludes1 note names sleep related teeth grinding (G47.63). A patient with psychogenic dysmenorrhea (an inclusion term of F45.8) and teeth grinding may have both codes reported. If it is not clear whether the conditions are related, query the provider.

Related References

ICD-10-CM Official GuidelinesICD-10-CM Code LookupICD-10-CM Codes ListCode Lists by Tag

Source: FY 2027 ICD-10-CM Tabular List (CMS and NCHS) and the ICD-10-CM Official Guidelines for Coding and Reporting FY 2027, Section I.A. ICD List is not affiliated with CMS or NCHS.