ICD-9 Code 323.9
Unspecified causes of encephalitis, myelitis, and encephalomyelitis
Not Valid for Submission
323.9 is a legacy non-billable code used to specify a medical diagnosis of unspecified causes of encephalitis, myelitis, and encephalomyelitis. This code was replaced on September 30, 2015 by its ICD-10 equivalent.
ICD-9: | 323.9 |
Short Description: | Encephalitis NOS |
Long Description: | Unspecified causes of encephalitis, myelitis, and encephalomyelitis |
Convert 323.9 to ICD-10
The following crosswalk between ICD-9 to ICD-10 is based based on the General Equivalence Mappings (GEMS) information:
Code Classification
-
Diseases of the nervous system (320–359)
-
Inflammatory diseases of the central nervous system (320-327)
- 323 Encephalitis, myelitis, and encephalomyelitis
-
Inflammatory diseases of the central nervous system (320-327)
Information for Medical Professionals
Synonyms
- Acute and subacute hemorrhagic leukoencephalitis
- Acute ascending myelitis
- Acute necrotizing myelitis
- Acute non-infective transverse myelitis
- Acute transverse myelitis
- Acute viral transverse myelitis
- Brainstem encephalitis
- Cerebral autosomal dominant arteriopathy with subcortical infarcts and leukoencephalopathy
- Cerebral irritation
- Encephalitis
- Encephalitis associated with acquired immunodeficiency syndrome
- Encephalitis, myelitis and encephalomyelitis
- Encephalomyelitis
- Focal encephalitis
- Fungal infection of brain
- Granulomatous meningoencephalitis
- Granulomatous meningoencephalomyelitis
- Inflammation of spinal cord due to toxin
- Leukoencephalopathy
- Limbic encephalitis
- Meningoencephalomyelitis
- Meningomyelitis
- Myelitis
- Myelitis associated with acquired immunodeficiency syndrome
- Primary encephalitis
- Rasmussen syndrome
- Subacute hemorrhagic leukoencephalitis
- Subacute necrotizing myelitis
- Transverse myelopathy syndrome
Index to Diseases and Injuries
References found for the code 323.9 in the Index of Diseases and Injuries:
- Encephalitis bacterial chronic hemorrhagic idiopathic nonepidemic spurious subacute 323.9
- acute SEE ALSO See Also
A “see also” instruction following a main term in the index instructs that there is another main term that may also be referenced that may provide additional index entries that may be useful. It is not necessary to follow the “see also” note when the original main term provides the necessary code. Encephalitis viral- disseminated postinfectious NEC NEC "Not elsewhere classifiable"
This abbreviation in the index represents “other specified” when a specific code is not available for a condition the index directs the coder to the “other specified” code in the tabular. 136.9 323.61- postimmunization or postvaccination 323.51
- inclusional 049.8
- inclusion body 049.8
- disseminated postinfectious NEC NEC "Not elsewhere classifiable"
- arboviral arbovirus NEC NEC "Not elsewhere classifiable"
This abbreviation in the index represents “other specified” when a specific code is not available for a condition the index directs the coder to the “other specified” code in the tabular. 064
- arthropod borne SEE ALSO See Also
A “see also” instruction following a main term in the index instructs that there is another main term that may also be referenced that may provide additional index entries that may be useful. It is not necessary to follow the “see also” note when the original main term provides the necessary code. Encephalitis viral arthropod borne 064
- Australian X 062.4
- Bwamba fever 066.3
- California virus 062.5
- Central European 063.2
- Czechoslovakian 063.2
- Dawson s inclusion body 046.2
- diffuse sclerosing 046.2
- due to
- actinomycosis 039.8 323.41
- cat scratch disease 078.3 323.01
- human herpesvirus 6 058.21
- human herpesvirus 7 058.29
- human herpesvirus NEC NEC "Not elsewhere classifiable"
This abbreviation in the index represents “other specified” when a specific code is not available for a condition the index directs the coder to the “other specified” code in the tabular. 058.29
- human immunodeficiency virus HIV disease 042 323.01
- infectious mononucleosis 075 323.01
- malaria SEE ALSO See Also
A “see also” instruction following a main term in the index instructs that there is another main term that may also be referenced that may provide additional index entries that may be useful. It is not necessary to follow the “see also” note when the original main term provides the necessary code. Malaria 084.6 323.2
- negishi virus 064
- ornithosis 073.7 323.01
- other infection classified elsewhere 136.9 323.41
- prophylactic inoculation against smallpox 323.51
- rickettsiosis SEE ALSO See Also
A “see also” instruction following a main term in the index instructs that there is another main term that may also be referenced that may provide additional index entries that may be useful. It is not necessary to follow the “see also” note when the original main term provides the necessary code. Rickettsiosis 083.9 323.1
- rubella 056.01
- toxoplasmosis acquired 130.0
- congenital active 771.2 323.41
- typhus fever SEE ALSO See Also
A “see also” instruction following a main term in the index instructs that there is another main term that may also be referenced that may provide additional index entries that may be useful. It is not necessary to follow the “see also” note when the original main term provides the necessary code. Typhus 081.9 323.1
- vaccination smallpox 323.51
- Eastern equine 062.2
- endemic 049.8
- epidemic 049.8
- equine acute infectious viral 062.9
- eastern 062.2
- venezuelan 066.2
- western 062.1
- Far Eastern 063.0
- following vaccination or other immunization procedure 323.51
- herpes 054.3
- human herpesvirus 6 058.21
- human herpesvirus 7 058.29
- human herpesvirus NEC NEC "Not elsewhere classifiable"
This abbreviation in the index represents “other specified” when a specific code is not available for a condition the index directs the coder to the “other specified” code in the tabular. 058.29
- ilheus virus 062.8
- inclusion body 046.2
- infectious acute virus NEC NEC "Not elsewhere classifiable"
This abbreviation in the index represents “other specified” when a specific code is not available for a condition the index directs the coder to the “other specified” code in the tabular. 049.8
- influenzal SEE ALSO See Also
A “see also” instruction following a main term in the index instructs that there is another main term that may also be referenced that may provide additional index entries that may be useful. It is not necessary to follow the “see also” note when the original main term provides the necessary code. Influenza 487.8 323.41- lethargic 049.8
- Japanese B type 062.0
- La Crosse 062.5
- Langat 063.8
- late effect see Late effect encephalitis
- lead 984.9 323.71
- lethargic acute infectious influenzal 049.8
- lethargica 049.8
- louping ill 063.1
- lupus 710.0 323.81
- lymphatica 049.0
- Mengo 049.8
- meningococcal 036.1
- mumps 072.2
- Murray Valley 062.4
- myoclonic 049.8
- Negishi virus 064
- parasitic NEC NEC "Not elsewhere classifiable"
This abbreviation in the index represents “other specified” when a specific code is not available for a condition the index directs the coder to the “other specified” code in the tabular. 123.9 323.41
- periaxialis concentrica diffusa 341.1
- postchickenpox 052.0
- postexanthematous NEC NEC "Not elsewhere classifiable"
This abbreviation in the index represents “other specified” when a specific code is not available for a condition the index directs the coder to the “other specified” code in the tabular. 057.9 323.62
- postimmunization 323.51
- postinfectious NEC NEC "Not elsewhere classifiable"
This abbreviation in the index represents “other specified” when a specific code is not available for a condition the index directs the coder to the “other specified” code in the tabular. 136.9 323.62
- postmeasles 055.0
- posttraumatic 323.81
- postvaccinal smallpox 323.51
- postvaricella 052.0
- postviral NEC NEC "Not elsewhere classifiable"
This abbreviation in the index represents “other specified” when a specific code is not available for a condition the index directs the coder to the “other specified” code in the tabular. 079.99 323.62- postexanthematous 057.9 323.62
- Powassan 063.8
- progressive subcortical Binswanger s 290.12
- Rasmussen 323.81
- Rio Bravo 049.8
- rubella 056.01
- Russian
- autumnal 062.0
- spring summer type taiga 063.0
- saturnine 984.9 323.71
- Semliki Forest 062.8
- serous 048
- slow acting virus NEC NEC "Not elsewhere classifiable"
This abbreviation in the index represents “other specified” when a specific code is not available for a condition the index directs the coder to the “other specified” code in the tabular. 046.8
- specified cause NEC NEC "Not elsewhere classifiable"
This abbreviation in the index represents “other specified” when a specific code is not available for a condition the index directs the coder to the “other specified” code in the tabular. 323.81
- St. Louis type 062.3
- subacute sclerosing 046.2
- subcorticalis chronica 290.12
- summer 062.0
- suppurative 324.0
- syphilitic 094.81
- congenital 090.41
- tick borne 063.9
- torula torular 117.5 323.41
- toxoplasmic acquired 130.0
- congenital active 771.2 323.41
- trichinosis 124 323.41
- Trypanosomiasis SEE ALSO See Also
A “see also” instruction following a main term in the index instructs that there is another main term that may also be referenced that may provide additional index entries that may be useful. It is not necessary to follow the “see also” note when the original main term provides the necessary code. Trypanosomiasis 086.9 323.2
- tuberculous SEE ALSO See Also
A “see also” instruction following a main term in the index instructs that there is another main term that may also be referenced that may provide additional index entries that may be useful. It is not necessary to follow the “see also” note when the original main term provides the necessary code. Tuberculosis 013.6
- type B Japanese 062.0
- type C 062.3
- van Bogaert s 046.2
- Venezuelan 066.2
- Vienna type 049.8
- viral virus 049.9
- arthropod borne NEC NEC "Not elsewhere classifiable"
This abbreviation in the index represents “other specified” when a specific code is not available for a condition the index directs the coder to the “other specified” code in the tabular. 064- mosquito borne 062.9
- Australian X disease 062.4
- California virus 062.5
- Eastern equine 062.2
- Ilheus virus 062.8
- Japanese B type 062.0
- Murray Valley 062.4
- specified type NEC NEC "Not elsewhere classifiable"
This abbreviation in the index represents “other specified” when a specific code is not available for a condition the index directs the coder to the “other specified” code in the tabular. 062.8
- St. Louis 062.3
- type B 062.0
- type C 062.3
- Western equine 062.1
- tick borne 063.9
- biundulant 063.2
- Central European 063.2
- Czechoslovakian 063.2
- diphasic meningoencephalitis 063.2
- Far Eastern 063.0
- Langat 063.8
- louping ill 063.1
- Powassan 063.8
- Russian spring summer taiga 063.0
- vector unknown 064
- mosquito borne 062.9
- specified type NEC NEC "Not elsewhere classifiable"
This abbreviation in the index represents “other specified” when a specific code is not available for a condition the index directs the coder to the “other specified” code in the tabular. 049.8
- vaccination prophylactic against V05.0
- arthropod borne NEC NEC "Not elsewhere classifiable"
- von Economo s 049.8
- Western equine 062.1
- West Nile type 066.41
- acute SEE ALSO See Also
- Encephalomyelitis chronic granulomatous myalgic benign SEE ALSO See Also
A “see also” instruction following a main term in the index instructs that there is another main term that may also be referenced that may provide additional index entries that may be useful. It is not necessary to follow the “see also” note when the original main term provides the necessary code. Encephalitis 323.9- abortive disseminated 049.8
- acute disseminated ADEM postinfectious 136.9 323.61
- infectious 136.9 323.61
- noninfectious 323.81
- postimmunization 323.51
- due to
- cat scratch disease 078.3 323.01
- infectious mononucleosis 075 323.01
- ornithosis 073.7 323.01
- vaccination any 323.51
- equine acute infectious 062.9
- eastern 062.2
- venezuelan 066.2
- western 062.1
- funicularis infectiosa 049.8
- late effect see Late effect encephalitis
- Munch Peterson s 049.8
- postchickenpox 052.0
- postimmunization 323.51
- postmeasles 055.0
- postvaccinal smallpox 323.51
- rubella 056.01
- specified cause NEC NEC "Not elsewhere classifiable"
This abbreviation in the index represents “other specified” when a specific code is not available for a condition the index directs the coder to the “other specified” code in the tabular. 323.81
- syphilitic 094.81
- West Nile 066.41
- Fever 780.60
- brain 323.9
- late effect see category 326
- cerebral 323.9
- late effect see category 326
- brain 323.9
- Hematomyelitis 323.9
- late effect see category 326
- Infection infected infective opportunistic 136.9
- brain SEE ALSO See Also
A “see also” instruction following a main term in the index instructs that there is another main term that may also be referenced that may provide additional index entries that may be useful. It is not necessary to follow the “see also” note when the original main term provides the necessary code. Encephalitis 323.9- late effect see category 326
- membranes SEE ALSO See Also
A “see also” instruction following a main term in the index instructs that there is another main term that may also be referenced that may provide additional index entries that may be useful. It is not necessary to follow the “see also” note when the original main term provides the necessary code. Meningitis 322.9
- septic 324.0
- late effect see category 326
- meninges SEE ALSO See Also
A “see also” instruction following a main term in the index instructs that there is another main term that may also be referenced that may provide additional index entries that may be useful. It is not necessary to follow the “see also” note when the original main term provides the necessary code. Meningitis 320.9
- spinal cord NEC NEC "Not elsewhere classifiable"
This abbreviation in the index represents “other specified” when a specific code is not available for a condition the index directs the coder to the “other specified” code in the tabular. SEE ALSO See Also
A “see also” instruction following a main term in the index instructs that there is another main term that may also be referenced that may provide additional index entries that may be useful. It is not necessary to follow the “see also” note when the original main term provides the necessary code. Encephalitis 323.9- abscess 324.1
- late effect see category 326
- late effect see category 326
- meninges see Meningitis
- streptococcal 320.2
- abscess 324.1
- brain SEE ALSO See Also
- Inflammation inflamed inflammatory with exudation
- brain SEE ALSO See Also
A “see also” instruction following a main term in the index instructs that there is another main term that may also be referenced that may provide additional index entries that may be useful. It is not necessary to follow the “see also” note when the original main term provides the necessary code. Encephalitis 323.9- late effect see category 326
- membrane see Meningitis
- cerebral SEE ALSO See Also
A “see also” instruction following a main term in the index instructs that there is another main term that may also be referenced that may provide additional index entries that may be useful. It is not necessary to follow the “see also” note when the original main term provides the necessary code. Encephalitis 323.9- late effect see category 326
- membrane see Meningitis
- spinal
- cord SEE ALSO See Also
A “see also” instruction following a main term in the index instructs that there is another main term that may also be referenced that may provide additional index entries that may be useful. It is not necessary to follow the “see also” note when the original main term provides the necessary code. Encephalitis 323.9- late effect see category 326
- cord SEE ALSO See Also
- brain SEE ALSO See Also
- Leukoencephalopathy SEE ALSO See Also
A “see also” instruction following a main term in the index instructs that there is another main term that may also be referenced that may provide additional index entries that may be useful. It is not necessary to follow the “see also” note when the original main term provides the necessary code. Encephalitis 323.9- acute NEC NEC "Not elsewhere classifiable"
This abbreviation in the index represents “other specified” when a specific code is not available for a condition the index directs the coder to the “other specified” code in the tabular.rotizing hemorrhagic postinfectious 136.9 323.61- postimmunization or postvaccinal 323.51
- arteriosclerotic 437.0
- Binswanger s 290.12
- metachromatic 330.0
- multifocal progressive 046.3
- progressive multifocal 046.3
- reversible posterior 348.5
- acute NEC NEC "Not elsewhere classifiable"
- Meningoencephalitis SEE ALSO See Also
A “see also” instruction following a main term in the index instructs that there is another main term that may also be referenced that may provide additional index entries that may be useful. It is not necessary to follow the “see also” note when the original main term provides the necessary code. Encephalitis 323.9- bacterial purulent pyogenic or septic see Meningitis
- diphasic 063.2
- due to
- actinomycosis 039.8 320.7
- blastomycosis NEC NEC "Not elsewhere classifiable"
This abbreviation in the index represents “other specified” when a specific code is not available for a condition the index directs the coder to the “other specified” code in the tabular. SEE ALSO See Also
A “see also” instruction following a main term in the index instructs that there is another main term that may also be referenced that may provide additional index entries that may be useful. It is not necessary to follow the “see also” note when the original main term provides the necessary code. Blastomycosis 116.0 323.41
- free living amebae 136.29
- Listeria monocytogenes 027.0 320.7
- Lyme disease 088.81 320.7
- mumps 072.2
- Naegleria amebae gruberi organisms 136.29
- rubella 056.01
- sporotrichosis 117.1 321.1
- toxoplasmosis acquired 130.0
- congenital active 771.2 323.41
- Trypanosoma 086.1 323.2
- epidemic 036.0
- herpes 054.3
- herpetic 054.3
- H. influenzae 320.0
- infectious acute 048
- influenzal 320.0
- late effect see category 326
- Listeria monocytogenes 027.0 320.7
- lymphocytic serous 049.0
- mumps 072.2
- parasitic NEC NEC "Not elsewhere classifiable"
This abbreviation in the index represents “other specified” when a specific code is not available for a condition the index directs the coder to the “other specified” code in the tabular. 123.9 323.41
- pneumococcal 320.1
- primary amebic 136.29
- rubella 056.01
- serous 048
- lymphocytic 049.0
- specific 094.2
- staphylococcal 320.3
- streptococcal 320.2
- syphilitic 094.2
- toxic NEC NEC "Not elsewhere classifiable"
This abbreviation in the index represents “other specified” when a specific code is not available for a condition the index directs the coder to the “other specified” code in the tabular. 989.9 323.71- due to
- carbon tetrachloride vapor 987.8 323.71
- hydroxyquinoline derivatives poisoning 961.3 323.71
- lead 984.9 323.71
- mercury 985.0 323.71
- thallium 985.8 323.71
- due to
- toxoplasmosis acquired 130.0
- trypanosomic 086.1 323.2
- tuberculous SEE ALSO See Also
A “see also” instruction following a main term in the index instructs that there is another main term that may also be referenced that may provide additional index entries that may be useful. It is not necessary to follow the “see also” note when the original main term provides the necessary code. Tuberculosis meninges 013.0
- Meningoencephalomyelitis SEE ALSO See Also
A “see also” instruction following a main term in the index instructs that there is another main term that may also be referenced that may provide additional index entries that may be useful. It is not necessary to follow the “see also” note when the original main term provides the necessary code. Meningoencephalitis 323.9- acute NEC NEC "Not elsewhere classifiable"
This abbreviation in the index represents “other specified” when a specific code is not available for a condition the index directs the coder to the “other specified” code in the tabular. 048- disseminated postinfectious 136.9 323.61
- postimmunization or postvaccination 323.51
- disseminated postinfectious 136.9 323.61
- due to
- actinomycosis 039.8 320.7
- torula 117.5 323.41
- toxoplasma or toxoplasmosis acquired 130.0
- congenital active 771.2 323.41
- late effect see category 326
- acute NEC NEC "Not elsewhere classifiable"
- Meningomyelitis SEE ALSO See Also
A “see also” instruction following a main term in the index instructs that there is another main term that may also be referenced that may provide additional index entries that may be useful. It is not necessary to follow the “see also” note when the original main term provides the necessary code. Meningoencephalitis 323.9- blastomycotic NEC NEC "Not elsewhere classifiable"
This abbreviation in the index represents “other specified” when a specific code is not available for a condition the index directs the coder to the “other specified” code in the tabular. SEE ALSO See Also
A “see also” instruction following a main term in the index instructs that there is another main term that may also be referenced that may provide additional index entries that may be useful. It is not necessary to follow the “see also” note when the original main term provides the necessary code. Blastomycosis 116.0 323.41
- due to
- actinomycosis 039.8 320.7
- blastomycosis SEE ALSO See Also
A “see also” instruction following a main term in the index instructs that there is another main term that may also be referenced that may provide additional index entries that may be useful. It is not necessary to follow the “see also” note when the original main term provides the necessary code. Blastomycosis 116.0 323.41
- Meningococcus 036.0
- sporotrichosis 117.1 323.41
- torula 117.5 323.41
- late effect see category 326
- lethargic 049.8
- meningococcal 036.0
- syphilitic 094.2
- tuberculous SEE ALSO See Also
A “see also” instruction following a main term in the index instructs that there is another main term that may also be referenced that may provide additional index entries that may be useful. It is not necessary to follow the “see also” note when the original main term provides the necessary code. Tuberculosis meninges 013.0
- blastomycotic NEC NEC "Not elsewhere classifiable"
- Mesencephalitis SEE ALSO See Also
A “see also” instruction following a main term in the index instructs that there is another main term that may also be referenced that may provide additional index entries that may be useful. It is not necessary to follow the “see also” note when the original main term provides the necessary code. Encephalitis 323.9- late effect see category 326
- Myelitis ascending cerebellar childhood chronic descending diffuse disseminated pressure progressive spinal cord subacute SEE ALSO See Also
A “see also” instruction following a main term in the index instructs that there is another main term that may also be referenced that may provide additional index entries that may be useful. It is not necessary to follow the “see also” note when the original main term provides the necessary code. Encephalitis 323.9- acute transverse 341.20
- idiopathic 341.22
- in conditions classified elsewhere 341.21
- due to
- other infection classified elsewhere 136.9 323.42
- specified cause NEC NEC "Not elsewhere classifiable"
This abbreviation in the index represents “other specified” when a specific code is not available for a condition the index directs the coder to the “other specified” code in the tabular. 323.82
- vaccination any 323.52
- viral diseases classified elsewhere 323.02
- herpes simplex 054.74
- herpes zoster 053.14
- late effect see category 326
- optic neuritis in 341.0
- postchickenpox 052.2
- postimmunization 323.52
- postinfectious 136.9 323.63
- postvaccinal 323.52
- postvaricella 052.2
- syphilitic transverse 094.89
- toxic 989.9 323.72
- transverse 323.82
- acute 341.20
- idiopathic 341.22
- in conditions classified elsewhere 341.21
- idiopathic 341.22
- acute 341.20
- tuberculous SEE ALSO See Also
A “see also” instruction following a main term in the index instructs that there is another main term that may also be referenced that may provide additional index entries that may be useful. It is not necessary to follow the “see also” note when the original main term provides the necessary code. Tuberculosis 013.6
- virus 049.9
- acute transverse 341.20
- Parencephalitis SEE ALSO See Also
A “see also” instruction following a main term in the index instructs that there is another main term that may also be referenced that may provide additional index entries that may be useful. It is not necessary to follow the “see also” note when the original main term provides the necessary code. Encephalitis 323.9- late effect see category 326
- Phrenitis 323.9
- Syringomyelitis 323.9
- late effect see category 326
Information for Patients
Encephalitis
Encephalitis is an inflammation of the brain. Usually the cause is a viral infection, but bacteria can also cause it. It can be mild or severe. Most cases are mild. You may have flu-like symptoms. With a mild case, you may just need rest, plenty of fluids, and a pain reliever.
Severe cases need immediate treatment. Symptoms of severe cases include:
- Severe headache
- Sudden fever
- Drowsiness
- Vomiting
- Confusion
- Seizures
In babies, additional symptoms may include constant crying, poor feeding, body stiffness, and bulging in the soft spots of the skull.
Severe cases may require a stay in the hospital. Treatments include oral and intravenous (IV) medicines to reduce inflammation and treat infection. Patients with breathing difficulties may need artificial respiration. Some people may need physical, speech, and occupational therapy once the illness is under control.
NIH: National Institute of Neurological Disorders and Stroke
[Read More]
Neurologic Diseases
The brain, spinal cord, and nerves make up the nervous system. Together they control all the workings of the body. When something goes wrong with a part of your nervous system, you can have trouble moving, speaking, swallowing, breathing, or learning. You can also have problems with your memory, senses, or mood.
There are more than 600 neurologic diseases. Major types include:
- Diseases caused by faulty genes, such as Huntington's disease and muscular dystrophy
- Problems with the way the nervous system develops, such as spina bifida
- Degenerative diseases, where nerve cells are damaged or die, such as Parkinson's disease and Alzheimer's disease
- Diseases of the blood vessels that supply the brain, such as stroke
- Injuries to the spinal cord and brain
- Seizure disorders, such as epilepsy
- Cancer, such as brain tumors
- infections, such as meningitis
[Read More]
ICD-9 Footnotes
General Equivalence Map Definitions
The ICD-9 and ICD-10 GEMs are used to facilitate linking between the diagnosis codes in ICD-9-CM and the new ICD-10-CM code set. The GEMs are the raw material from which providers, health information vendors and payers can derive specific applied mappings to meet their needs.
- Approximate Flag - The approximate flag is on, indicating that the relationship between the code in the source system and the code in the target system is an approximate equivalent.
- No Map Flag - The no map flag indicates that a code in the source system is not linked to any code in the target system.
- Combination Flag - The combination flag indicates that more than one code in the target system is required to satisfy the full equivalent meaning of a code in the source system.
Index of Diseases and Injuries Definitions
- And - The word "and" should be interpreted to mean either "and" or "or" when it appears in a title.
- Code also note - A "code also" note instructs that two codes may be required to fully describe a condition, but this note does not provide sequencing direction.
- Code first - Certain conditions have both an underlying etiology and multiple body system manifestations due to the underlying etiology. For such conditions, the ICD-10-CM has a coding convention that requires the underlying condition be sequenced first followed by the manifestation. Wherever such a combination exists, there is a "use additional code" note at the etiology code, and a "code first" note at the manifestation code. These instructional notes indicate the proper sequencing order of the codes, etiology followed by manifestation.
- Type 1 Excludes Notes - A type 1 Excludes note is a pure excludes note. It means "NOT CODED HERE!" An Excludes1 note indicates that the code excluded should never be used at the same time as the code above the Excludes1 note. An Excludes1 is used when two conditions cannot occur together, such as a congenital form versus an acquired form of the same condition.
- Type 2 Excludes Notes - A type 2 Excludes note represents "Not included here". An excludes2 note indicates that the condition excluded is not part of the condition represented by the code, but a patient may have both conditions at the same time. When an Excludes2 note appears under a code, it is acceptable to use both the code and the excluded code together, when appropriate.
- Includes Notes - This note appears immediately under a three character code title to further define, or give examples of, the content of the category.
- Inclusion terms - List of terms is included under some codes. These terms are the conditions for which that code is to be used. The terms may be synonyms of the code title, or, in the case of "other specified" codes, the terms are a list of the various conditions assigned to that code. The inclusion terms are not necessarily exhaustive. Additional terms found only in the Alphabetic Index may also be assigned to a code.
- NEC "Not elsewhere classifiable" - This abbreviation in the Alphabetic Index represents "other specified". When a specific code is not available for a condition, the Alphabetic Index directs the coder to the "other specified” code in the Tabular List.
- NOS "Not otherwise specified" - This abbreviation is the equivalent of unspecified.
- See - The "see" instruction following a main term in the Alphabetic Index indicates that another term should be referenced. It is necessary to go to the main term referenced with the "see" note to locate the correct code.
- See Also - A "see also" instruction following a main term in the Alphabetic Index instructs that there is another main term that may also be referenced that may provide additional Alphabetic Index entries that may be useful. It is not necessary to follow the "see also" note when the original main term provides the necessary code.
- 7th Characters - Certain ICD-10-CM categories have applicable 7th characters. The applicable 7th character is required for all codes within the category, or as the notes in the Tabular List instruct. The 7th character must always be the 7th character in the data field. If a code that requires a 7th character is not 6 characters, a placeholder X must be used to fill in the empty characters.
- With - The word "with" should be interpreted to mean "associated with" or "due to" when it appears in a code title, the Alphabetic Index, or an instructional note in the Tabular List. The word "with" in the Alphabetic Index is sequenced immediately following the main term, not in alphabetical order.