ICD-10-CM Excludes2 Notes · Chapter 6 · FY 2027 G00-G99
Excludes2 Notes in Chapter 6: Diseases of the nervous system ICD-10-CM
An Excludes2 note means "NOT INCLUDED HERE": the excluded condition is not part of this code, but a patient may have both, so both codes may be reported. In Chapter 6 (G00-G99), notes printed in the chapter name other codes 142 times, and Excludes2 Notes anywhere in the Tabular List name the chapter’s codes 96 times, covering 62 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
142
References in Its Notes
96
References to Its Codes
62
Chapter Codes Named
G00-G99
Chapter 6
Chapter 6
Excludes2 Notes by the code that carries the note
28 of 28 shown
- certain conditions originating in the perinatal period (P04-P96)
- certain infectious and parasitic diseases (A00-B99)
- complications of pregnancy, childbirth and the puerperium (O00-O9A)
- congenital malformations, deformations, and chromosomal abnormalities (Q00-Q99)
- endocrine, nutritional and metabolic diseases (E00-E88)
- injury, poisoning and certain other consequences of external causes (S00-T88)
- neoplasms (C00-D49)
- symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R94)
- G08 Intracranial and intraspinal phlebitis and thrombophlebitis
- intracranial phlebitis and thrombophlebitis complicating nonpyogenic intraspinal phlebitis and thrombophlebitis (G95.1)
- G11.3 Cerebellar ataxia with defective DNA repair
- multi-system degeneration of the autonomic nervous system (G90.3)
- athetoid cerebral palsy (G80.3)
- sleep related movement disorders (G47.6-)
- Reye's syndrome (G93.7)
- G36.0 Neuromyelitis optica [Devic]
- optic neuritis NOS (H46)
- G44.1 Vascular headache, not elsewhere classified
- headache with orthostatic or positional component, not elsewhere classified (R51.0)
- alcohol related insomnia (F10.182, F10.282, F10.982)
- drug-related insomnia (F11.182, F11.282, F11.982, F13.182, F13.282, F13.982, F14.182, F14.282, F14.982, F15.182, F15.282, F15.982, F19.182, F19.282, F19.982)
- idiopathic insomnia (F51.01)
- insomnia due to a mental disorder (F51.05)
- insomnia not due to a substance or known physiological condition (F51.0-)
- nonorganic insomnia (F51.0-)
- primary insomnia (F51.01)
- sleep apnea (G47.3-)
- alcohol-related hypersomnia (F10.182, F10.282, F10.982)
- drug-related hypersomnia (F11.182, F11.282, F11.982, F13.182, F13.282, F13.982, F14.182, F14.282, F14.982, F15.182, F15.282, F15.982, F19.182, F19.282, F19.982)
- hypersomnia due to a mental disorder (F51.13)
- hypersomnia not due to a substance or known physiological condition (F51.1-)
- primary hypersomnia (F51.11)
- sleep apnea (G47.3-)
- restless legs syndrome (G25.81)
- sciatica attributed to intervertebral disc disorder (M51.1.-)
- arthrogryposis multiplex congenita (Q74.3)
- atypical face pain (G50.1)
- headache syndromes (G44.-)
- abdomen pain (R10.-)
- back pain (M54.9)
- breast pain (N64.4)
- chest pain (R07.1-R07.9)
- ear pain (H92.0-)
- eye pain (H57.1)
- headache (R51.9)
- joint pain (M25.5-)
- limb pain (M79.6-)
- lumbar region pain (M54.5-)
- painful urination (R30.9)
- pelvic and perineal pain (R10.2-)
- shoulder pain (M25.51-)
- spine pain (M54.-)
- throat pain (R07.0)
- tongue pain (K14.6)
- tooth pain (K08.8)
- renal colic (N23)
- migraines (G43.-)
- myalgia (M79.1-)
- pain from prosthetic devices, implants, and grafts (T82.84, T83.84, T84.84, T85.84-)
- phantom limb syndrome with pain (G54.6)
- vulvar vestibulitis (N94.810)
- vulvodynia (N94.81-)
- myelitis (G04.-)
- intraspinal phlebitis and thrombophlebitis, except non-pyogenic (G08)
- G97 Intraoperative and postprocedural complications and disorders of nervous system, not elsewhere classified applies to 18 codes
- G04.02 Postimmunization acute disseminated encephalitis, myelitis and encephalomyelitis
- T88.1 Other complications following immunization, not elsewhere classified: postimmunization encephalitis (G04.02)
- G95 Other and unspecified diseases of spinal cord: myelitis (G04.-)
- G08 Intracranial and intraspinal phlebitis and thrombophlebitis
- F98.4 Stereotyped movement disorders: movement disorders of organic origin (G20-G25)
- G23.1 Progressive supranuclear ophthalmoplegia [Steele-Richardson-Olszewski]
- H49 Paralytic strabismus: progressive supranuclear ophthalmoplegia (G23.1)
- G24.5 Blepharospasm
- H02.5 Other disorders affecting eyelid function: blepharospasm (G24.5)
- G25.69 Other tics of organic origin
- H02.5 Other disorders affecting eyelid function: organic tic (G25.69)
- G25.81 Restless legs syndrome
- G47.6 Sleep related movement disorders: restless legs syndrome (G25.81)
- G30.0- Alzheimer's disease with early onset
- E85 Amyloidosis: Alzheimer's disease (G30.0-)
- G31.2 Degeneration of nervous system due to alcohol
- G04 Encephalitis, myelitis and encephalomyelitis: multiple sclerosis (G35-)
- G36.0 Neuromyelitis optica [Devic]
- H46 Optic neuritis: neuromyelitis optica [Devic] (G36.0)
- G37.3 Acute transverse myelitis in demyelinating disease of central nervous system
- G04 Encephalitis, myelitis and encephalomyelitis: acute transverse myelitis (G37.3)
- G37.4 Subacute necrotizing myelitis of central nervous system
- G04 Encephalitis, myelitis and encephalomyelitis: subacute necrotizing myelitis (G37.4)
- R25.2 Cramp and spasm: infantile spasms (G40.4-)
- R51 Headache: migraine and other headache syndromes (G43-G44)
- G44.1 Vascular headache, not elsewhere classified: cluster headache (G44.0)
- G44.1 Vascular headache, not elsewhere classified: post-traumatic headache (G44.3-)
- G44.1 Vascular headache, not elsewhere classified: drug-induced headache (G44.4-)
- G44.1 Vascular headache, not elsewhere classified: complicated headache syndromes (G44.5-)
- G44.1 Vascular headache, not elsewhere classified: other specified headache syndromes (G44.8-)
- G45.2 Multiple and bilateral precerebral artery syndromes
- I67.4 Hypertensive encephalopathy: insufficiency, NOS, of precerebral arteries (G45.2)
- G45.9 Transient cerebral ischemic attack, unspecified
- Chapter 9 (I00-I99) Diseases of the circulatory system: transient cerebral ischemic attacks and related syndromes (G45.-)
- I63.9 Cerebral infarction, unspecified: transient cerebral ischemic attacks and related syndromes (G45.-)
- F51.0 Insomnia not due to a substance or known physiological condition: insomnia NOS (G47.0-)
- F51.0 Insomnia not due to a substance or known physiological condition: insomnia due to known physiological condition (G47.0-)
- F51.0 Insomnia not due to a substance or known physiological condition: organic insomnia (G47.0-)
- G47.10 Hypersomnia, unspecified
- G47.11 Idiopathic hypersomnia with long sleep time
- F51.1 Hypersomnia not due to a substance or known physiological condition: idiopathic hypersomnia (G47.11, G47.12)
- G47.12 Idiopathic hypersomnia without long sleep time
- F51.1 Hypersomnia not due to a substance or known physiological condition: idiopathic hypersomnia (G47.11, G47.12)
- G47.13 Recurrent hypersomnia
- F98 Other behavioral and emotional disorders with onset usually occurring in childhood and adolescence: Kleine-Levin syndrome (G47.13)
- G47.35 Congenital central alveolar hypoventilation syndrome
- F51.1 Hypersomnia not due to a substance or known physiological condition: narcolepsy (G47.4-)
- G25 Other extrapyramidal and movement disorders: sleep related movement disorders (G47.6-)
- F51 Sleep disorders not due to a substance or known physiological condition: organic sleep disorders (G47.-)
- G50.0 Trigeminal neuralgia
- G50.1 Atypical facial pain
- G54.0 Brachial plexus disorders
- M53.1 Cervicobrachial syndrome: thoracic outlet syndrome (G54.0)
- G54.6 Phantom limb syndrome with pain
- G89 Pain, not elsewhere classified: phantom limb syndrome with pain (G54.6)
- T87.89 Other complications of amputation stump: phantom limb syndrome (G54.6-G54.7)
- G11 Hereditary ataxia: hereditary and idiopathic neuropathy (G60.-)
- G71.13 Myotonic chondrodystrophy
- Block M60-M63 Disorders of muscles: muscular dystrophies and myopathies (G71-G72)
- G72.41 Inclusion body myositis [IBM]
- M60 Myositis: inclusion body myositis [IBM] (G72.41)
- G80.3 Athetoid cerebral palsy
- G24 Dystonia: athetoid cerebral palsy (G80.3)
- G11 Hereditary ataxia: cerebral palsy (G80.-)
- G83.84 Todd's paralysis (postepileptic)
- G40 Epilepsy and recurrent seizures: Todd's paralysis (G83.84)
- G90.1 Familial dysautonomia [Riley-Day]
- Q07 Other congenital malformations of nervous system: familial dysautonomia [Riley-Day] (G90.1)
- G90.3 Multi-system degeneration of the autonomic nervous system
- G23 Other degenerative diseases of basal ganglia: multi-system degeneration of the autonomic nervous system (G90.3)
- G92.8 Other toxic encephalopathy
- G93.32 Myalgic encephalomyelitis/chronic fatigue syndrome
- G04 Encephalitis, myelitis and encephalomyelitis: myalgic encephalomyelitis (G93.32)
- G93.7 Reye's syndrome
- G31 Other degenerative diseases of nervous system, not elsewhere classified: Reye's syndrome (G93.7)
- Block K70-K77 Diseases of liver: Reye's syndrome (G93.7)
- G93.81 Temporal sclerosis
- G94 Other disorders of brain in diseases classified elsewhere
- G93.4 Other and unspecified encephalopathy: encephalopathy in diseases classified elsewhere (G94)
- G97.0 Cerebrospinal fluid leak from spinal puncture
- Block T80-T88 Complications of surgical and medical care, not elsewhere classified: cerebrospinal fluid leak from spinal puncture (G97.0)
- G97.1 Other reaction to spinal and lumbar puncture
- G44 Other headache syndromes: headache due to lumbar puncture (G97.1)
- G97.3- Intraoperative hemorrhage and hematoma of a nervous system organ or structure complicating a procedure 2 codes
- I97.4 Intraoperative hemorrhage and hematoma of a circulatory system organ or structure complicating a procedure: intraoperative cerebrovascular hemorrhage complicating a procedure (G97.3-)
- Block T80-T88 Complications of surgical and medical care, not elsewhere classified: intraoperative and postprocedural complications of specified body systems (D78.-, E36.-, E89.-, G97.3-, G97.4, H59.3-, H59.-, H95.2-, H95.3, I97.4-, I97.5, J95.6-, J95.7, K91.6-, L76.-, M96.-, N99.-)
- T81 Complications of procedures, not elsewhere classified: intraoperative and postprocedural complications of specific body system (D78.-, E36.-, E89.-, G97.3-, G97.4, H59.3-, H59.-, H95.2-, H95.3, I97.4-, I97.5, J95, K91.-, L76.-, M96.-, N99.-)
- G97.4 Accidental puncture and laceration of a nervous system organ or structure during a procedure 3 codes
- I97.5 Accidental puncture and laceration of a circulatory system organ or structure during a procedure: accidental puncture and laceration of brain during a procedure (G97.4-)
- Block T80-T88 Complications of surgical and medical care, not elsewhere classified: intraoperative and postprocedural complications of specified body systems (D78.-, E36.-, E89.-, G97.3-, G97.4, H59.3-, H59.-, H95.2-, H95.3, I97.4-, I97.5, J95.6-, J95.7, K91.6-, L76.-, M96.-, N99.-)
- T81 Complications of procedures, not elsewhere classified: intraoperative and postprocedural complications of specific body system (D78.-, E36.-, E89.-, G97.3-, G97.4, H59.3-, H59.-, H95.2-, H95.3, I97.4-, I97.5, J95, K91.-, L76.-, M96.-, N99.-)
- G97.5- Postprocedural hemorrhage of a nervous system organ or structure following a procedure 2 codes
- I97.6 Postprocedural hemorrhage, hematoma and seroma of a circulatory system organ or structure following a procedure: postprocedural cerebrovascular hemorrhage complicating a procedure (G97.5-)
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 Excludes2 Notes anywhere in the Tabular List, including notes in other chapters.
Questions About Excludes2 Notes
What does an Excludes2 note mean?
An Excludes2 note means “Not included here”: the excluded condition is not part of the condition represented by the code, but a patient may have both conditions at the same time (Section I.A.12.b). The FY 2027 Tabular List has 2,529 of them; 2,493 name other codes, with 2,799 references to 1,779 distinct codes, categories and ranges.
Can both codes be reported when there is an Excludes2 note?
Yes. When an Excludes2 note appears under a code, it is acceptable to use both the code and the excluded code together, when appropriate: that is, when the patient has both conditions and both are documented.
Related References
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.
