ICD-10-CM Code For Other Disorders Of Nervous System Not Elsewhere Classified: Group Overview

The International Classification of Diseases, Tenth Revision, Clinical Modification (ICD-10-CM) code group G98 includes a heterogeneous set of nervous system disorders that are not classified in other specific ICD-10-CM categories, such as certain autonomic dysfunctions and postprocedural nervous system complications. These ICD-10-CM diagnosis codes are used to document clinical scenarios where a nervous system condition does not have a more specific code, capturing disease distribution, severity, or involvement of nervous system structures. Accurate coding within the ICD-10-CM G98 group supports proper claim adjudication, complete clinical documentation, and appropriate reimbursement.

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ICD-10-CM G98: Other Disorders Of Nervous System Not Elsewhere Classified Overview

This group captures uncommon or residual nervous system disorders that are not classified elsewhere in the International Classification of Diseases, Tenth Revision, Clinical Modification. It targets conditions affecting the peripheral or central nervous system that lack more specific codes elsewhere. Accurate coding matters for complete clinical documentation and correct claim processing to reflect patient complexity and support appropriate reimbursement.

When to Use

Use a code from this group when a clinician documents a nervous system disorder that cannot be classified to a more specific ICD-10-CM code elsewhere in the classification. These codes are appropriate for documenting atypical presentations, postprocedural nervous system complications, or other explicit nervous conditions lacking a dedicated code.

ICD-10-CM Codes

2 rows

ICD-10-CM Code	Description
G98.0	Neurogenic arthritis, not elsewhere classified
G98.8	Other disorders of nervous system

DRG Codes

6 rows

DRG Code	Description
070	Other Cerebrovascular Disorders with MCC
071	Other Cerebrovascular Disorders with CC
072	Other Cerebrovascular Disorders without CC/MCC
974	HIV with Major Related Condition with MCC
975	HIV with Major Related Condition with CC
976	HIV with Major Related Condition without CC/MCC

Typical Clinical Scenarios

An adult presents to the emergency department with sudden-onset severe dizziness, nausea, and unsteady gait after a recent viral illness; neurological exam shows prominent vestibular dysfunction without clear central lesion on imaging, and the clinician documents an unspecified disorder of the peripheral nervous system not classifiable elsewhere. A code from this group is assigned when symptoms and signs point to a nervous system disorder that cannot be more specifically categorized. Typical codes: G98.8
A middle-aged patient in outpatient neurology clinic with several months of progressive autonomic symptoms (orthostatic intolerance, abnormal sweating, and gastrointestinal dysmotility) that do not meet criteria for a defined autonomic neuropathy; the workup excludes diabetes, autoimmune, and genetic causes. Because the autonomic dysfunction is a recognized nervous system disorder not otherwise specified in other categories, an unspecified code from this group is used for diagnostic and billing documentation. Typical codes: G98.8
A hospitalized patient with advanced cancer develops acute new-onset diffuse neuropathic pain and multifocal peripheral nerve deficits attributed to paraneoplastic or cancer treatment–related involvement of the peripheral nervous system, but without a more specific neuropathy diagnosis documented. In the inpatient record, the treating team assigns a general disorder code from this group to capture the nervous system complication related to the malignancy. Typical codes: G98.8, G98.0

ICD-10-CM Code For Disorders Of Autonomic Nervous System: Group Overview

G91-HYDROCEPHALUS

ICD-10-CM Code For Hydrocephalus: Group Overview

G92-TOXIC-ENCEPHALOPATHY

ICD-10-CM Code For Toxic Encephalopathy: Group Overview

G93-OTHER-DISORDERS-OF-BRAIN

ICD-10-CM Code For Other Disorders Of Brain: Group Overview

G94-OTHER-DISORDERS-OF-BRAIN

ICD-10-CM Code For Other Disorders Of Brain In Diseases Classified Elsewhere: Group Overview

G95-OTHER-AND-UNSPECIFIED-SPINAL-CORD

ICD-10-CM Code For Other And Unspecified Diseases Of Spinal Cord: Group Overview

G96-OTHER-DISORDERS-OF-CENTRAL-NERVOUS-SYSTEM

ICD-10-CM Code For Other Disorders Of Central Nervous System: Group Overview

G97-INTRAOPERATIVE-AND-POSTPROCEDURAL-NERVOUS-SYSTEM

ICD-10-CM Code For Intraoperative And Postprocedural Complications Of Nervous System: Group Overview

G99-OTHER-DISORDERS-OF-NERVOUS-SYSTEM

ICD-10-CM Code For Other Disorders Of Nervous System In Diseases Classified Elsewhere: Group Overview

Frequently Asked Questions

References

1.CPT® Codes and Descriptions. AAPC. Retrieved Aug 11, 2026.Maintains the CPT code set's official descriptions and guidelines, licensed from the American Medical Association, used as the definitional source for CPT codes on this page.
2.HCPCS Quarterly Update. Centers for Medicare & Medicaid Services (CMS). Retrieved Aug 11, 2026.CMS's quarterly release of HCPCS Level II codes and short/long descriptors, the source for HCPCS code definitions and update history.
3.ICD-10-CM Full Code List. Centers for Medicare & Medicaid Services (CMS). Retrieved Aug 11, 2026.CMS's complete ICD-10-CM diagnosis code list, used to cross-reference diagnosis codes associated with this procedure or service.

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When to Use

ICD-10-CM Codes

2 rows

ICD-10-CM Code	Description
G98.0	Neurogenic arthritis, not elsewhere classified
G98.8	Other disorders of nervous system

DRG Codes

6 rows

DRG Code	Description
070	Other Cerebrovascular Disorders with MCC
071	Other Cerebrovascular Disorders with CC
072	Other Cerebrovascular Disorders without CC/MCC
974	HIV with Major Related Condition with MCC
975	HIV with Major Related Condition with CC
976	HIV with Major Related Condition without CC/MCC

Typical Clinical Scenarios

An adult presents to the emergency department with sudden-onset severe dizziness, nausea, and unsteady gait after a recent viral illness; neurological exam shows prominent vestibular dysfunction without clear central lesion on imaging, and the clinician documents an unspecified disorder of the peripheral nervous system not classifiable elsewhere. A code from this group is assigned when symptoms and signs point to a nervous system disorder that cannot be more specifically categorized. Typical codes: G98.8
A middle-aged patient in outpatient neurology clinic with several months of progressive autonomic symptoms (orthostatic intolerance, abnormal sweating, and gastrointestinal dysmotility) that do not meet criteria for a defined autonomic neuropathy; the workup excludes diabetes, autoimmune, and genetic causes. Because the autonomic dysfunction is a recognized nervous system disorder not otherwise specified in other categories, an unspecified code from this group is used for diagnostic and billing documentation. Typical codes: G98.8
A hospitalized patient with advanced cancer develops acute new-onset diffuse neuropathic pain and multifocal peripheral nerve deficits attributed to paraneoplastic or cancer treatment–related involvement of the peripheral nervous system, but without a more specific neuropathy diagnosis documented. In the inpatient record, the treating team assigns a general disorder code from this group to capture the nervous system complication related to the malignancy. Typical codes: G98.8, G98.0

ICD-10-CM Code For Disorders Of Autonomic Nervous System: Group Overview

G91-HYDROCEPHALUS

ICD-10-CM Code For Hydrocephalus: Group Overview

G92-TOXIC-ENCEPHALOPATHY

ICD-10-CM Code For Toxic Encephalopathy: Group Overview

G93-OTHER-DISORDERS-OF-BRAIN

ICD-10-CM Code For Other Disorders Of Brain: Group Overview

G94-OTHER-DISORDERS-OF-BRAIN

ICD-10-CM Code For Other Disorders Of Brain In Diseases Classified Elsewhere: Group Overview

G95-OTHER-AND-UNSPECIFIED-SPINAL-CORD

ICD-10-CM Code For Other And Unspecified Diseases Of Spinal Cord: Group Overview

G96-OTHER-DISORDERS-OF-CENTRAL-NERVOUS-SYSTEM

ICD-10-CM Code For Other Disorders Of Central Nervous System: Group Overview

G97-INTRAOPERATIVE-AND-POSTPROCEDURAL-NERVOUS-SYSTEM

ICD-10-CM Code For Intraoperative And Postprocedural Complications Of Nervous System: Group Overview

G99-OTHER-DISORDERS-OF-NERVOUS-SYSTEM

ICD-10-CM Code For Other Disorders Of Nervous System In Diseases Classified Elsewhere: Group Overview

Frequently Asked Questions

References

1.CPT® Codes and Descriptions. AAPC. Retrieved Aug 11, 2026.Maintains the CPT code set's official descriptions and guidelines, licensed from the American Medical Association, used as the definitional source for CPT codes on this page.
2.HCPCS Quarterly Update. Centers for Medicare & Medicaid Services (CMS). Retrieved Aug 11, 2026.CMS's quarterly release of HCPCS Level II codes and short/long descriptors, the source for HCPCS code definitions and update history.
3.ICD-10-CM Full Code List. Centers for Medicare & Medicaid Services (CMS). Retrieved Aug 11, 2026.CMS's complete ICD-10-CM diagnosis code list, used to cross-reference diagnosis codes associated with this procedure or service.

Published by

Trek Health powers OpenPayer with a leading commercial payer intelligence platform, seamlessly converting fragmented payer data into actionable insights for provider organizations.

ICD-10-CM Code For Other Disorders Of Nervous System Not Elsewhere Classified: Group Overview

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ICD-10-CM G98: Other Disorders Of Nervous System Not Elsewhere Classified Overview

ICD-10-CM Code For Other Disorders Of Nervous System Not Elsewhere Classified: Group Overview

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ICD-10-CM G98: Other Disorders Of Nervous System Not Elsewhere Classified Overview

When to Use

ICD-10-CM Codes

DRG Codes

Typical Clinical Scenarios

Related Codes

References

When to Use

ICD-10-CM Codes

DRG Codes

Typical Clinical Scenarios

Related Codes

References

ICD-10-CM Code For Other Disorders Of Nervous System Not Elsewhere Classified: Group Overview

Sign up for ICD-10-CM Code For Other Disorders Of Nervous System Not Elsewhere Classified: Group Overview policy alerts

ICD-10-CM G98: Other Disorders Of Nervous System Not Elsewhere Classified Overview

ICD-10-CM Code For Other Disorders Of Nervous System Not Elsewhere Classified: Group Overview

Sign up for ICD-10-CM Code For Other Disorders Of Nervous System Not Elsewhere Classified: Group Overview policy alerts

ICD-10-CM G98: Other Disorders Of Nervous System Not Elsewhere Classified Overview

When to Use

ICD-10-CM Codes

DRG Codes

Typical Clinical Scenarios

Related Codes

Which conditions are included in ICD-10-CM group G98?

When should a coder use a code from the `G98` group?

How does accurate coding in the `G98` group affect claims and reimbursement?

What related DRGs may be associated with diagnoses from the `G98` group?

Does the `G98` group include postprocedural nervous system complications or autonomic dysfunctions?

References

When to Use

ICD-10-CM Codes

DRG Codes

Typical Clinical Scenarios

Related Codes

Which conditions are included in ICD-10-CM group G98?

When should a coder use a code from the `G98` group?

How does accurate coding in the `G98` group affect claims and reimbursement?

What related DRGs may be associated with diagnoses from the `G98` group?

Does the `G98` group include postprocedural nervous system complications or autonomic dysfunctions?

References