2024 ICD-10-CM Diagnosis Code G04.91

Approximate Synonyms

The following clinical terms are approximate synonyms or lay terms that might be used to identify the correct diagnosis code:

• Acute ascending myelitis
• Encephalitis, myelitis and encephalomyelitis
• Infection causing myelitis
• Myelitis
• Myelitis caused by bacterium
• Myelitis caused by virus

Clinical Information

• Myelitis

  inflammation of the spinal cord. relatively common etiologies include infections; autoimmune diseases; spinal cord; and ischemia (see also spinal cord vascular diseases). clinical features generally include weakness, sensory loss, localized pain, incontinence, and other signs of autonomic dysfunction.

• Myelitis, Transverse

  inflammation of a transverse portion of the spinal cord characterized by acute or subacute segmental demyelination or necrosis. the condition may occur sporadically, follow an infection or vaccination, or present as a paraneoplastic syndrome (see also encephalomyelitis, acute disseminated). clinical manifestations include motor weakness, sensory loss, and incontinence. (adams et al., principles of neurology, 6th ed, pp1242-6)

• Neuroschistosomiasis

  schistosomiasis of the brain, spinal cord, or meninges caused by infections with trematodes of the genus schistosoma (primarily schistosoma japonicum; schistosoma mansoni; and schistosoma haematobium in humans). s. japonicum infections of the nervous system may cause an acute meningoencephalitis or a chronic encephalopathy. s. mansoni and s. haematobium nervous system infections are associated with acute transverse myelitis involving the lower portions of the spinal cord. (from joynt, clinical neurology, 1998, ch27, pp61-2)

• Acute Disseminated Encephalomyelitis|ADEM|ADEM

  an inflammatory process affecting the central nervous system. it is characterized by perivascular demyelination. symptoms usually follow an acute viral infection or immunization and include fever, confusion, somnolence and involuntary movements. it may lead to coma and death.

• Acute Flaccid Myelitis

  an acute onset of focal limb weakness that is associated mainly with gray matter abnormalities or csf pleocytosis, but which is without an apparent cause.

• Acute Poliomyelitis|Polia|Polio|Polio|Poliomyelitis

  an acute infectious disorder that affects the nervous system. it is caused by the poliovirus. the virus spreads by direct contact, and can be prevented by prophylaxis with the polio vaccine.

• Acute Transverse Myelitis

  a neurologic disorder that is caused by inflammation across both sides of one level, or segment, of the spinal cord. (from ninds)

• Acute Transverse Myelitis in Demyelinating Disease of Central Nervous System|Acute transverse myelitis in demyelinating disease of central nervous system

  evidence of acute transverse myelitis in demyelinating disease of the central nervous system.

• Chronic Fatigue Syndrome|Myalgic Encephalomyelitis|Myalgic encephalomyelitis/chronic fatigue syndrome|chronic fatigue syndrome

  a syndrome of unknown etiology. chronic fatigue syndrome (cfs) is a clinical diagnosis characterized by an unexplained persistent or relapsing chronic fatigue that is of at least six months' duration, is not the result of ongoing exertion, is not substantially alleviated by rest, and results in substantial reduction of previous levels of occupational, educational, social, or personal activities. common concurrent symptoms of at least six months duration include impairment of memory or concentration, diffuse pain, sore throat, tender lymph nodes, headaches of a new type, pattern, or severity, and nonrestorative sleep. the etiology of cfs may be viral or immunologic. neurasthenia and fibromyalgia may represent related disorders. also known as myalgic encephalomyelitis.

• Chronic Recurrent Multifocal Osteomyelitis|CRMO|CRMO|NBO|NBO|Non-bacterial Osteomyelitis|Non-bacterial Osteomyelitis

  an autoinflammatory disease characterized by sterile bone lesions which are multifocal and/or recurrent.

• Diphtheria-Tetanus-Acellular Pertussis-Inactivated Poliomyelitis-Haemophilus influenzae Type B Vaccine|DTaP(5)-IPV-Hib|DTaP-IPV-Hib|Pediacel

  a vaccine consisting of detoxified diphtheria toxoid (d), detoxified tetanus toxoid (t), acellular pertussis (ap) antigens, inactivated poliovirus (ipv) types 1, 2 and 3, and haemophilus influenzae type b (hib) capsular polysaccharide (polyribosylribitol phosphate; prp) covalently bound to tetanus protein, suspended in water for injection and with active immunizing activity against diphtheria, tetanus, pertussis, poliomyelitis and h. influenzae type b. the five purified pertussis antigens in this vaccine are pertussis toxin (pt), filamentous hemagglutinin (fha), pertactin (prn) and fimbriae types 2 and 3 (fim). upon intramuscular injection of the diphtheria-tetanus-acellular pertussis-inactivated poliomyelitis-haemophilus influenzae type b vaccine (dtap-ipv-hib), this vaccine activates the immune system to develop antibodies against diphtheria toxin, tetanus toxin, b. pertussis antigens, polioviruses and hib, thereby providing active immunization against these diseases. the diphtheria and tetanus toxoids and pertussis antigens (inactivated pt, fha, prn and fim) are adsorbed separately onto aluminum phosphate and then combined with ipv and prp.

• Encephalomyelitis

  inflammation of the brain and the spinal cord.

• Encephalomyelitis Infection, CTCAE|Encephalomyelitis Infection|Encephalomyelitis infection

  a disorder characterized by an infectious process involving the brain and spinal cord tissues.

• Experimental Allergic Encephalomyelitis|EAE|Experimental Autoimmune Encephalomyelitis

  an autoimmune demyelinating disease of the central nervous system that is produced experimentally in animals by the injection of homogenized brain or spinal cord in freund's adjuvant. myelin basic protein appears to be the antigen that elicits the hypersensitivity immune response which is characterized by focal areas of lymphocyte and macrophage infiltration into the brain, associated with demyelination and destruction of the blood-brain barrier. experimental allergic encephalomyelitis (eae) is used as an animal model for demyelinating diseases of the human central nervous system such as multiple sclerosis.

• Grade 1 Myelitis, CTCAE|Grade 1 Myelitis|Grade 1 Myelitis

  asymptomatic; mild signs (e.g., babinski's reflex or lhermitte's sign)

• Grade 2 Myelitis, CTCAE|Grade 2 Myelitis|Grade 2 Myelitis

  moderate weakness or sensory loss; limiting instrumental adl

• Grade 3 Encephalomyelitis Infection, CTCAE|Grade 3 Encephalomyelitis infection

  iv antibiotic, antifungal, or antiviral intervention indicated; invasive intervention indicated

• Grade 3 Myelitis, CTCAE|Grade 3 Myelitis|Grade 3 Myelitis

  severe weakness or sensory loss; limiting self care adl

• Grade 4 Encephalomyelitis Infection, CTCAE|Grade 4 Encephalomyelitis infection

  life-threatening consequences; urgent intervention indicated

• Grade 4 Myelitis, CTCAE|Grade 4 Myelitis|Grade 4 Myelitis

  life-threatening consequences; urgent intervention indicated

• Grade 5 Encephalomyelitis Infection, CTCAE|Grade 5 Encephalomyelitis infection

  death

• Grade 5 Myelitis, CTCAE|Grade 5 Myelitis|Grade 5 Myelitis

  death

• Infectious Encephalomyelitis|Encephalomyelitis infection

  an infectious process that affects the brain and spinal cord tissues. it is usually caused by viruses.

• Myelitis

  an inflammatory process affecting the spinal cord. causes include viral infections, autoimmune disorders, vascular disorders, and toxic agents. symptoms include weakness, paresthesia, sensory loss, pain, and incontinence.

• Myelitis, CTCAE|Myelitis|Myelitis|Myelitis

  a disorder characterized by inflammation involving the spinal cord. symptoms include weakness, paresthesia, sensory loss, marked discomfort and incontinence.

• Neuromyelitis Optica|Devic Syndrome|Neuromyelitis optica [Devic]

  an autoimmune inflammatory syndrome characterized by optic neuritis and myelitis. signs and symptoms include loss of vision, weakness and paralysis of the extremities, and loss of sensation.

• Osteomyelitis|osteomyelitis

  an acute or chronic inflammation of the bone and its structures due to infection with pyogenic bacteria.

• Staphylococcal Osteomyelitis|Staph Osteomyelitis|Staph Osteomyelitis

  osteomyelitis resulting from an infection with staphylococcus.

• Subacute Necrotizing Myelitis of Central Nervous System|Subacute necrotizing myelitis of central nervous system

  evidence of subacute necrotizing myelitis of central nervous system.

• Vaccine-Associated Paralytic Poliomyelitis|OPV associated Paralytic Poliomyelitis|VAPP|VAPP

  a rare, paralytic poliomyelitis associated with the orally administered live attenuated strain of the poliovirus, opv.

• Western Equine Encephalomyelitis

  a mosquito-born viral infection caused by the western equine encephalitis virus. the signs and symptoms range from flu-like illness to permanent central nervous system damage, coma, and death.

Convert G04.91 to ICD-9-CM

• ICD-9-CM Code: 323.9 - Encephalitis NOS
  Approximate Flag - The approximate mapping means there is not an exact match between the ICD-10 and ICD-9 codes and the mapped code is not a precise representation of the original code.

Patient Education

Spinal Cord Diseases

Your spinal cord is a bundle of nerves that runs down the middle of your back. It carries signals back and forth between your body and your brain. It is protected by your vertebrae, which are the bone disks that make up your spine. If you have an accident that damages the vertebrae or other parts of the spine, this can also injure the spinal cord. Other spinal cord problems include:

• Tumors
• Infections such as meningitis and polio
• Inflammatory diseases
• Autoimmune diseases
• Degenerative diseases such as amyotrophic lateral sclerosis and spinal muscular atrophy

Symptoms vary but might include pain, numbness, loss of sensation and muscle weakness. These symptoms can occur around the spinal cord, and also in other areas such as your arms and legs. Treatments often include medicines and surgery.

Code History

• FY 2024 - No Change, effective from 10/1/2023 through 9/30/2024
• FY 2023 - No Change, effective from 10/1/2022 through 9/30/2023
• FY 2022 - No Change, effective from 10/1/2021 through 9/30/2022
• FY 2021 - No Change, effective from 10/1/2020 through 9/30/2021
• FY 2020 - No Change, effective from 10/1/2019 through 9/30/2020
• FY 2019 - No Change, effective from 10/1/2018 through 9/30/2019
• FY 2018 - No Change, effective from 10/1/2017 through 9/30/2018
• FY 2017 - No Change, effective from 10/1/2016 through 9/30/2017
• FY 2016 - New Code, effective from 10/1/2015 through 9/30/2016. This was the first year ICD-10-CM was implemented into the HIPAA code set.