ICD-10-CM Section · G89-G99
Other disorders of the nervous system
146 codes in this section
146
Total Codes
112
Billable
34
Header (Non-Billable)
11
Top-Level Codes
About Section G89-G99
Section G89-G99 (G89-G99) covers other disorders of the nervous system. It sits within the Diseases of the nervous system chapter (G00-G99). This section contains 146 ICD-10-CM codes, 112 billable diagnoses you can submit on a claim, and 34 non-billable header codes used to organize the hierarchy.
Codes are organized below by 3-character root. Click the root to see all subcodes underneath it, or click any individual code for full coverage data, payer policies, and linked CPT procedures.
Codes in G89-G99
Grouped by 3-character root code. Click any code for full detail.
G89
Pain, not elsewhere classified
12 subcodes
| G89.0 | Central pain syndrome | Billable |
| G89.1 | Acute pain, not elsewhere classified | Header |
| G89.11 | Acute pain due to trauma | Billable |
| G89.12 | Acute post-thoracotomy pain | Billable |
| G89.18 | Other acute postprocedural pain | Billable |
| G89.2 | Chronic pain, not elsewhere classified | Header |
| G89.21 | Chronic pain due to trauma | Billable |
| G89.22 | Chronic post-thoracotomy pain | Billable |
| G89.28 | Other chronic postprocedural pain | Billable |
| G89.29 | Other chronic pain | Billable |
| G89.3 | Neoplasm related pain (acute) (chronic) | Billable |
| G89.4 | Chronic pain syndrome | Billable |
G90
Disorders of autonomic nervous system
26 subcodes
| G90.0 | Idiopathic peripheral autonomic neuropathy | Header |
| G90.01 | Carotid sinus syncope | Billable |
| G90.09 | Other idiopathic peripheral autonomic neuropathy | Billable |
| G90.1 | Familial dysautonomia [Riley-Day] | Billable |
| G90.2 | Horner's syndrome | Billable |
| G90.3 | Multi-system degeneration of the autonomic nervous system | Billable |
| G90.4 | Autonomic dysreflexia | Billable |
| G90.5 | Complex regional pain syndrome I (CRPS I) | Header |
| G90.50 | Complex regional pain syndrome I, unspecified | Billable |
| G90.51 | Complex regional pain syndrome I of upper limb | Header |
| G90.511 | Complex regional pain syndrome I of right upper limb | Billable |
| G90.512 | Complex regional pain syndrome I of left upper limb | Billable |
| G90.513 | Complex regional pain syndrome I of upper limb, bilateral | Billable |
| G90.519 | Complex regional pain syndrome I of unspecified upper limb | Billable |
| G90.52 | Complex regional pain syndrome I of lower limb | Header |
| G90.521 | Complex regional pain syndrome I of right lower limb | Billable |
| G90.522 | Complex regional pain syndrome I of left lower limb | Billable |
| G90.523 | Complex regional pain syndrome I of lower limb, bilateral | Billable |
| G90.529 | Complex regional pain syndrome I of unspecified lower limb | Billable |
| G90.59 | Complex regional pain syndrome I of other specified site | Billable |
| G90.8 | Other disorders of autonomic nervous system | Header |
| G90.81 | Serotonin syndrome | Billable |
| G90.89 | Other disorders of autonomic nervous system | Billable |
| G90.9 | Disorder of the autonomic nervous system, unspecified | Billable |
| G90.A | Postural orthostatic tachycardia syndrome [POTS] | Billable |
| G90.B | LMNB1-related autosomal dominant leukodystrophy | Billable |
G91
Hydrocephalus
7 subcodes
| G91.0 | Communicating hydrocephalus | Billable |
| G91.1 | Obstructive hydrocephalus | Billable |
| G91.2 | (Idiopathic) normal pressure hydrocephalus | Billable |
| G91.3 | Post-traumatic hydrocephalus, unspecified | Billable |
| G91.4 | Hydrocephalus in diseases classified elsewhere | Billable |
| G91.8 | Other hydrocephalus | Billable |
| G91.9 | Hydrocephalus, unspecified | Billable |
G92
Toxic encephalopathy
9 subcodes
| G92.0 | Immune effector cell-associated neurotoxicity syndrome | Header |
| G92.00 | Immune effector cell-associated neurotoxicity syndrome, grade unspecified | Billable |
| G92.01 | Immune effector cell-associated neurotoxicity syndrome, grade 1 | Billable |
| G92.02 | Immune effector cell-associated neurotoxicity syndrome, grade 2 | Billable |
| G92.03 | Immune effector cell-associated neurotoxicity syndrome, grade 3 | Billable |
| G92.04 | Immune effector cell-associated neurotoxicity syndrome, grade 4 | Billable |
| G92.05 | Immune effector cell-associated neurotoxicity syndrome, grade 5 | Billable |
| G92.8 | Other toxic encephalopathy | Billable |
| G92.9 | Unspecified toxic encephalopathy | Billable |
G93
Other disorders of brain
23 subcodes
| G93.0 | Cerebral cysts | Billable |
| G93.1 | Anoxic brain damage, not elsewhere classified | Billable |
| G93.2 | Benign intracranial hypertension | Billable |
| G93.3 | Postviral and related fatigue syndromes | Header |
| G93.31 | Postviral fatigue syndrome | Billable |
| G93.32 | Myalgic encephalomyelitis/chronic fatigue syndrome | Billable |
| G93.39 | Other post infection and related fatigue syndromes | Billable |
| G93.4 | Other and unspecified encephalopathy | Header |
| G93.40 | Encephalopathy, unspecified | Billable |
| G93.41 | Metabolic encephalopathy | Billable |
| G93.42 | Megalencephalic leukoencephalopathy with subcortical cysts | Billable |
| G93.43 | Leukoencephalopathy with calcifications and cysts | Billable |
| G93.44 | Adult-onset leukodystrophy with axonal spheroids | Billable |
| G93.45 | Developmental and epileptic encephalopathy | Billable |
| G93.49 | Other encephalopathy | Billable |
| G93.5 | Compression of brain | Billable |
| G93.6 | Cerebral edema | Billable |
| G93.7 | Reye's syndrome | Billable |
| G93.8 | Other specified disorders of brain | Header |
| G93.81 | Temporal sclerosis | Billable |
| G93.82 | Brain death | Billable |
| G93.89 | Other specified disorders of brain | Billable |
| G93.9 | Disorder of brain, unspecified | Billable |
G94
Other disorders of brain in diseases classified elsewhere
0 subcodes
G95
Other and unspecified diseases of spinal cord
11 subcodes
| G95.0 | Syringomyelia and syringobulbia | Billable |
| G95.1 | Vascular myelopathies | Header |
| G95.11 | Acute infarction of spinal cord (embolic) (nonembolic) | Billable |
| G95.19 | Other vascular myelopathies | Billable |
| G95.2 | Other and unspecified cord compression | Header |
| G95.20 | Unspecified cord compression | Billable |
| G95.29 | Other cord compression | Billable |
| G95.8 | Other specified diseases of spinal cord | Header |
| G95.81 | Conus medullaris syndrome | Billable |
| G95.89 | Other specified diseases of spinal cord | Billable |
| G95.9 | Disease of spinal cord, unspecified | Billable |
G96
Other disorders of central nervous system
19 subcodes
| G96.0 | Cerebrospinal fluid leak | Header |
| G96.00 | Cerebrospinal fluid leak, unspecified | Billable |
| G96.01 | Cranial cerebrospinal fluid leak, spontaneous | Billable |
| G96.02 | Spinal cerebrospinal fluid leak, spontaneous | Billable |
| G96.08 | Other cranial cerebrospinal fluid leak | Billable |
| G96.09 | Other spinal cerebrospinal fluid leak | Billable |
| G96.1 | Disorders of meninges, not elsewhere classified | Header |
| G96.11 | Dural tear | Billable |
| G96.12 | Meningeal adhesions (cerebral) (spinal) | Billable |
| G96.19 | Other disorders of meninges, not elsewhere classified | Header |
| G96.191 | Perineural cyst | Billable |
| G96.198 | Other disorders of meninges, not elsewhere classified | Billable |
| G96.8 | Other specified disorders of central nervous system | Header |
| G96.81 | Intracranial hypotension | Header |
| G96.810 | Intracranial hypotension, unspecified | Billable |
| G96.811 | Intracranial hypotension, spontaneous | Billable |
| G96.819 | Other intracranial hypotension | Billable |
| G96.89 | Other specified disorders of central nervous system | Billable |
| G96.9 | Disorder of central nervous system, unspecified | Billable |
G97
Intraoperative and postprocedural complications and disorders of nervous system, not elsewhere classified
23 subcodes
| G97.0 | Cerebrospinal fluid leak from spinal puncture | Billable |
| G97.1 | Other reaction to spinal and lumbar puncture | Billable |
| G97.2 | Intracranial hypotension following ventricular shunting | Billable |
| G97.3 | Intraoperative hemorrhage and hematoma of a nervous system organ or structure complicating a procedure | Header |
| G97.31 | Intraoperative hemorrhage and hematoma of a nervous system organ or structure complicating a nervous system procedure | Billable |
| G97.32 | Intraoperative hemorrhage and hematoma of a nervous system organ or structure complicating other procedure | Billable |
| G97.4 | Accidental puncture and laceration of a nervous system organ or structure during a procedure | Header |
| G97.41 | Accidental puncture or laceration of dura during a procedure | Billable |
| G97.48 | Accidental puncture and laceration of other nervous system organ or structure during a nervous system procedure | Billable |
| G97.49 | Accidental puncture and laceration of other nervous system organ or structure during other procedure | Billable |
| G97.5 | Postprocedural hemorrhage of a nervous system organ or structure following a procedure | Header |
| G97.51 | Postprocedural hemorrhage of a nervous system organ or structure following a nervous system procedure | Billable |
| G97.52 | Postprocedural hemorrhage of a nervous system organ or structure following other procedure | Billable |
| G97.6 | Postprocedural hematoma and seroma of a nervous system organ or structure following a procedure | Header |
| G97.61 | Postprocedural hematoma of a nervous system organ or structure following a nervous system procedure | Billable |
| G97.62 | Postprocedural hematoma of a nervous system organ or structure following other procedure | Billable |
| G97.63 | Postprocedural seroma of a nervous system organ or structure following a nervous system procedure | Billable |
| G97.64 | Postprocedural seroma of a nervous system organ or structure following other procedure | Billable |
| G97.8 | Other intraoperative and postprocedural complications and disorders of nervous system | Header |
| G97.81 | Other intraoperative complications of nervous system | Billable |
| G97.82 | Other postprocedural complications and disorders of nervous system | Billable |
| G97.83 | Intracranial hypotension following lumbar cerebrospinal fluid shunting | Billable |
| G97.84 | Intracranial hypotension following other procedure | Billable |
G98
Other disorders of nervous system not elsewhere classified
2 subcodes
| G98.0 | Neurogenic arthritis, not elsewhere classified | Billable |
| G98.8 | Other disorders of nervous system | Billable |
G99
Other disorders of nervous system in diseases classified elsewhere
3 subcodes
| G99.0 | Autonomic neuropathy in diseases classified elsewhere | Billable |
| G99.2 | Myelopathy in diseases classified elsewhere | Billable |
| G99.8 | Other specified disorders of nervous system in diseases classified elsewhere | Billable |
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Verified against the CMS 2026 code set on May 31, 2026.
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