Other disorders of the nervous system (G89-G99)
G89Pain, not elsewhere classified
Code Also: related psychological factors associated with pain (F45.42)
Excludes 1: generalized pain NOS (R52)
› pain disorders exclusively related to psychological factors (F45.41)
› pain NOS (R52)
Excludes 2: atypical face pain (G50.1)
› headache syndromes (G44.-)
› localized pain, unspecified type - code to pain by site, such as:
› 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-)
G89.0Central pain syndrome
› Déjérine-Roussy syndrome
› Myelopathic pain syndrome
› Thalamic pain syndrome (hyperesthetic)
G89.1Acute pain, not elsewhere classified
G89.11Acute pain due to trauma
G89.12Acute post-thoracotomy pain
› Post-thoracotomy pain NOS
G89.18Other acute postprocedural pain
› Postoperative pain NOS
› Postprocedural pain NOS
G89.2Chronic pain, not elsewhere classified
Excludes 1: 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-)
G89.21Chronic pain due to trauma
G89.22Chronic post-thoracotomy pain
G89.28Other chronic postprocedural pain
› Other chronic postoperative pain
G89.29Other chronic pain
G89.3Neoplasm related pain (acute) (chronic)
› Cancer associated pain
› Pain due to malignancy (primary) (secondary)
› Tumor associated pain
G89.4Chronic pain syndrome
› Chronic pain associated with significant psychosocial dysfunction
G90Disorders of autonomic nervous system
Excludes 1: dysfunction of the autonomic nervous system due to alcohol (G31.2)
G90.0Idiopathic peripheral autonomic neuropathy
G90.01Carotid sinus syncope
› Carotid sinus syndrome
G90.09Other idiopathic peripheral autonomic neuropathy
› Idiopathic peripheral autonomic neuropathy NOS
G90.1Familial dysautonomia [Riley-Day]
G90.2Horner's syndrome
› Bernard(-Horner) syndrome
› Cervical sympathetic dystrophy or paralysis
G90.3Multi-system degeneration of the autonomic nervous system
› Neurogenic orthostatic hypotension [Shy-Drager]
Excludes 1: orthostatic hypotension NOS (I95.1)
G90.4Autonomic dysreflexia
Use Additional Code: code to identify the cause, such as:
› fecal impaction (K56.41)
› pressure ulcer (pressure area) (L89.-)
› urinary tract infection (N39.0)
G90.5Complex regional pain syndrome I (CRPS I)
› Reflex sympathetic dystrophy
Excludes 1: 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-)
G90.50Complex regional pain syndrome I, unspecified
G90.51Complex regional pain syndrome I of upper limb
G90.511Complex regional pain syndrome I of right upper limb
G90.512Complex regional pain syndrome I of left upper limb
G90.513Complex regional pain syndrome I of upper limb, bilateral
G90.519Complex regional pain syndrome I of unspecified upper limb
G90.52Complex regional pain syndrome I of lower limb
G90.521Complex regional pain syndrome I of right lower limb
G90.522Complex regional pain syndrome I of left lower limb
G90.523Complex regional pain syndrome I of lower limb, bilateral
G90.529Complex regional pain syndrome I of unspecified lower limb
G90.59Complex regional pain syndrome I of other specified site
G90.8Other disorders of autonomic nervous system
G90.9Disorder of the autonomic nervous system, unspecified
G90.APostural orthostatic tachycardia syndrome [POTS]
› Chronic orthostatic intolerance
› Postural tachycardia syndrome
G90.BLMNB1-related autosomal dominant leukodystrophy
G91Hydrocephalus
Includes: acquired hydrocephalus
Excludes 1: Arnold-Chiari syndrome with hydrocephalus (Q07.-)
› congenital hydrocephalus (Q03.-)
› spina bifida with hydrocephalus (Q05.-)
G91.0Communicating hydrocephalus
› Secondary normal pressure hydrocephalus
G91.1Obstructive hydrocephalus
G91.2(Idiopathic) normal pressure hydrocephalus
› Normal pressure hydrocephalus NOS
G91.3Post-traumatic hydrocephalus, unspecified
G91.4Hydrocephalus in diseases classified elsewhere
Code First: underlying condition, such as:
› congenital syphilis (A50.4-)
› neoplasm (C00-D49)
› plasminogen deficiency (E88.02)
Excludes 1: hydrocephalus due to congenital toxoplasmosis (P37.1)
G91.8Other hydrocephalus
G91.9Hydrocephalus, unspecified
G92Toxic encephalopathy
G92.0Immune effector cell-associated neurotoxicity syndrome
Code First: underlying cause such as:
› complications of immune effector cellular therapy (T80.82)
Code Also: , if applicable, associated signs and symptoms, such as:
› cerebral edema (G93.6)
› unspecified convulsions (R56.9)
G92.00Immune effector cell-associated neurotoxicity syndrome, grade unspecified
› ICANS, grade unspecified
G92.01Immune effector cell-associated neurotoxicity syndrome, grade 1
› ICANS, grade 1
G92.02Immune effector cell-associated neurotoxicity syndrome, grade 2
› ICANS, grade 2
G92.03Immune effector cell-associated neurotoxicity syndrome, grade 3
› ICANS, grade 3
G92.04Immune effector cell-associated neurotoxicity syndrome, grade 4
› ICANS, grade 4
G92.05Immune effector cell-associated neurotoxicity syndrome, grade 5
› ICANS, grade 5
G92.8Other toxic encephalopathy
› Toxic encephalitis
› Toxic metabolic encephalopathy
Code First: poisoning due to drug or toxin, if applicable, (T36-T65 with fifth or sixth character 1-4)
Use Additional Code: code for adverse effect, if applicable, to identify drug (T36-T50) with fifth or sixth character 5)
G92.9Unspecified toxic encephalopathy
Code First: poisoning due to drug or toxin, if applicable, (T36-T65 with fifth or sixth character 1-4)
Use Additional Code: code for adverse effect, if applicable, to identify drug (T36-T50) with fifth or sixth character 5)
G93Other disorders of brain
G93.0Cerebral cysts
› Arachnoid cyst
› Porencephalic cyst, acquired
Excludes 1: acquired periventricular cysts of newborn (P91.1)
› congenital cerebral cysts (Q04.6)
G93.1Anoxic brain damage, not elsewhere classified
Excludes 1: cerebral anoxia due to anesthesia during labor and delivery (O74.3)
› cerebral anoxia due to anesthesia during the puerperium (O89.2)
› neonatal anoxia (P84)
G93.2Benign intracranial hypertension
› Pseudotumor
Excludes 1: hypertensive encephalopathy (I67.4)
› obstructive hydrocephalus (G91.1)
G93.3Postviral and related fatigue syndromes
Use Additional Code: code, if applicable, for post COVID-19 condition, unspecified (U09.9)
Excludes 1: chronic fatigue NOS (R53.82)
› neurasthenia (F48.8)
G93.31Postviral fatigue syndrome
G93.32Myalgic encephalomyelitis/chronic fatigue syndrome
› Chronic fatigue syndrome
› ME/CFS
› Myalgic encephalomyelitis
G93.39Other post infection and related fatigue syndromes
G93.4Other and unspecified encephalopathy
Excludes 2: alcoholic encephalopathy (G31.2)
› encephalopathy in diseases classified elsewhere (G94)
› hypertensive encephalopathy (I67.4)
› toxic (metabolic) encephalopathy (G92.8)
G93.40Encephalopathy, unspecified
G93.41Metabolic encephalopathy
› Septic encephalopathy
G93.42Megaloencephalic leukoencephalopathy with subcortical cysts
G93.43Leukoencephalopathy with calcifications and cysts
G93.44Adult-onset leukodystrophy with axonal spheroids
› Adult-onset leukoencephalopathy with axonal spheroids and pigmented glia
G93.49Other encephalopathy
› Encephalopathy NEC
G93.5Compression of brain
› Arnold-Chiari type 1 compression of brain
› Compression of brain (stem)
› Herniation of brain (stem)
Excludes 1: traumatic compression of brain (S06.A-)
G93.6Cerebral edema
Excludes 1: cerebral edema due to birth injury (P11.0)
› traumatic cerebral edema (S06.1-)
G93.7Reye's syndrome
Code First: poisoning due to salicylates, if applicable (T39.0-, with sixth character 1-4)
Use Additional Code: code for adverse effect due to salicylates, if applicable (T39.0-, with sixth character 5)
G93.8Other specified disorders of brain
G93.81Temporal sclerosis
› Hippocampal sclerosis
› Mesial temporal sclerosis
G93.82Brain death
G93.89Other specified disorders of brain
› Postradiation encephalopathy
G93.9Disorder of brain, unspecified
G94Other disorders of brain in diseases classified elsewhere
Code First: underlying disease
Excludes 1: 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)
G95Other and unspecified diseases of spinal cord
Excludes 2: myelitis (G04.-)
G95.0Syringomyelia and syringobulbia
G95.1Vascular myelopathies
Excludes 2: intraspinal phlebitis and thrombophlebitis, except non-pyogenic (G08)
G95.11Acute infarction of spinal cord (embolic) (nonembolic)
› Anoxia of spinal cord
› Arterial thrombosis of spinal cord
G95.19Other vascular myelopathies
› Edema of spinal cord
› Hematomyelia
› Nonpyogenic intraspinal phlebitis and thrombophlebitis
› Subacute necrotic myelopathy
G95.2Other and unspecified cord compression
G95.20Unspecified cord compression
G95.29Other cord compression
G95.8Other specified diseases of spinal cord
Excludes 1: neurogenic bladder NOS (N31.9)
› neurogenic bladder due to cauda equina syndrome (G83.4)
› neuromuscular dysfunction of bladder without spinal cord lesion (N31.-)
G95.81Conus medullaris syndrome
G95.89Other specified diseases of spinal cord
› Cord bladder NOS
› Drug-induced myelopathy
› Radiation-induced myelopathy
Excludes 1: myelopathy NOS (G95.9)
G95.9Disease of spinal cord, unspecified
› Myelopathy NOS
G96Other disorders of central nervous system
G96.0Cerebrospinal fluid leak
Code Also: if applicable:
› intracranial hypotension (G96.81-)
Excludes 1: cerebrospinal fluid leak from spinal puncture (G97.0)
G96.00Cerebrospinal fluid leak, unspecified
Code Also: if applicable:
› head injury (S00-S09)
G96.01Cranial cerebrospinal fluid leak, spontaneous
› Otorrhea due to spontaneous cerebrospinal fluid CSF leak
› Rhinorrhea due to spontaneous cerebrospinal fluid CSF leak
› Spontaneous cerebrospinal fluid leak from skull base
G96.02Spinal cerebrospinal fluid leak, spontaneous
› Spontaneous cerebrospinal fluid leak from spine
G96.08Other cranial cerebrospinal fluid leak
› Postoperative cranial cerebrospinal fluid leak
› Traumatic cranial cerebrospinal fluid leak
Code Also: if applicable:
› head injury (S00 - S09)
G96.09Other spinal cerebrospinal fluid leak
› Other spinal CSF leak
› Postoperative spinal cerebrospinal fluid leak
› Traumatic spinal cerebrospinal fluid leak
Code Also: if applicable:
› head injury (S00 - S09)
G96.1Disorders of meninges, not elsewhere classified
G96.11Dural tear
Code Also: intracranial hypotension, if applicable (G96.81-)
Excludes 1: accidental puncture or laceration of dura during a procedure (G97.41)
G96.12Meningeal adhesions (cerebral) (spinal)
G96.19Other disorders of meninges, not elsewhere classified
G96.191Perineural cyst
› Cervical nerve root cyst
› Lumbar nerve root cyst
› Sacral nerve root cyst
› Tarlov cyst
› Thoracic nerve root cyst
G96.198Other disorders of meninges, not elsewhere classified
G96.8Other specified disorders of central nervous system
G96.81Intracranial hypotension
Code Also: any associated diagnoses, such as:
› Brachial amyotrophy (G54.5)
› Cerebrospinal fluid leak from spine (G96.02)
› Cranial nerve disorders in diseases classified elsewhere (G53)
› Nerve root and compressions in diseases classified elsewhere (G55)
› Nonpyogenic thrombosis of intracranial venous system (I67.6)
› Nontraumatic intracerebral hemorrhage (I61.-)
› Nontraumatic subdural hemorrhage (I62.0-)
› Other and unspecified cord compression (G95.2-)
› Other secondary parkinsonism (G21.8)
› Reversible cerebrovascular vasoconstriction syndrome (I67.841)
› Spinal cord herniation (G95.89)
› Stroke (I63.-)
› Syringomyelia (G95.0)
G96.810Intracranial hypotension, unspecified
G96.811Intracranial hypotension, spontaneous
G96.819Other intracranial hypotension
G96.89Other specified disorders of central nervous system
G96.9Disorder of central nervous system, unspecified
G97Intraoperative and postprocedural complications and disorders of nervous system, not elsewhere classified
Excludes 2: intraoperative and postprocedural cerebrovascular infarction (I97.81-, I97.82-)
G97.0Cerebrospinal fluid leak from spinal puncture
Code Also: any associated diagnoses or complications, such as:
› intracranial hypotension following a procedure (G97.83-G97.84)
G97.1Other reaction to spinal and lumbar puncture
› Headache due to lumbar puncture
› Other reaction to spinal dural puncture
Code Also: , if applicable, any associated headache with orthostatic component (R51.0)
G97.2Intracranial hypotension following ventricular shunting
Code Also: any associated diagnoses or complications
G97.3Intraoperative hemorrhage and hematoma of a nervous system organ or structure complicating a procedure
Excludes 1: intraoperative hemorrhage and hematoma of a nervous system organ or structure due to accidental puncture and laceration during a procedure (G97.4-)
G97.31Intraoperative hemorrhage and hematoma of a nervous system organ or structure complicating a nervous system procedure
G97.32Intraoperative hemorrhage and hematoma of a nervous system organ or structure complicating other procedure
G97.4Accidental puncture and laceration of a nervous system organ or structure during a procedure
G97.41Accidental puncture or laceration of dura during a procedure
› Incidental (inadvertent) durotomy
Code Also: any associated diagnoses or complications
G97.48Accidental puncture and laceration of other nervous system organ or structure during a nervous system procedure
G97.49Accidental puncture and laceration of other nervous system organ or structure during other procedure
G97.5Postprocedural hemorrhage of a nervous system organ or structure following a procedure
G97.51Postprocedural hemorrhage of a nervous system organ or structure following a nervous system procedure
G97.52Postprocedural hemorrhage of a nervous system organ or structure following other procedure
G97.6Postprocedural hematoma and seroma of a nervous system organ or structure following a procedure
G97.61Postprocedural hematoma of a nervous system organ or structure following a nervous system procedure
G97.62Postprocedural hematoma of a nervous system organ or structure following other procedure
G97.63Postprocedural seroma of a nervous system organ or structure following a nervous system procedure
G97.64Postprocedural seroma of a nervous system organ or structure following other procedure
G97.8Other intraoperative and postprocedural complications and disorders of nervous system
Use Additional Code: code to further specify disorder
G97.81Other intraoperative complications of nervous system
G97.82Other postprocedural complications and disorders of nervous system
G97.83Intracranial hypotension following lumbar cerebrospinal fluid shunting
Code Also: any associated diagnoses or complications
G97.84Intracranial hypotension following other procedure
Code Also: , if applicable:
› accidental puncture or laceration of dura during a procedure (G97.41)
› cerebrospinal fluid leak from spinal puncture (G97.0)
G98Other disorders of nervous system not elsewhere classified
Includes: nervous system disorder NOS
G98.0Neurogenic arthritis, not elsewhere classified
› Nonsyphilitic neurogenic arthropathy NEC
› Nonsyphilitic neurogenic spondylopathy NEC
Excludes 1: spondylopathy (in):
› syringomyelia and syringobulbia (G95.0)
› tabes dorsalis (A52.11)
G98.8Other disorders of nervous system
› Nervous system disorder NOS
G99Other disorders of nervous system in diseases classified elsewhere
G99.0Autonomic neuropathy in diseases classified elsewhere
Code First: underlying disease, such as:
› amyloidosis (E85.-)
› gout (M1A.-, M10.-)
› hyperthyroidism (E05.-)
Excludes 1: diabetic autonomic neuropathy (E08-E13 with .43)
G99.2Myelopathy in diseases classified elsewhere
Code First: underlying disease, such as:
› neoplasm (C00-D49)
Excludes 1: myelopathy in:
› intervertebral disease (M50.0-, M51.0-)
› spondylosis (M47.0-, M47.1-)
G99.8Other specified disorders of nervous system in diseases classified elsewhere
Code First: underlying disorder, such as:
› amyloidosis (E85.-)
› avitaminosis (E56.-)
Excludes 1: nervous system involvement in:
› cysticercosis (B69.0)
› rubella (B06.0-)
› syphilis (A52.1-)