1. Mary Jo Bowie MS, BS, AAS, RHIA, RHIT

2. Diseases of the Nervous System
CHAPTER 11
Diseases of the Nervous System

3. Diseases of the Nervous System—Code Range G00-G99
Diseases of the Nervous System are reported from Chapter 6 of ICD-10-CM.
This chapter contains codes for disorders of the nervous system. The nervous system controls all bodily activities.

4. Nervous System Central Nervous System—The brain and spinal cord.
Peripheral Nervous System—The part of the nervous system that directly branches off the central nervous system. Twelve pairs of cranial nerves and 12 pairs of spinal nerves are part of this system.

5. Anatomy of Nervous System
© Cengage Learning 2014

6. Inflammatory Diseases of the Central Nervous System—G00-G09
Diseases reported here include:
Meningitis
Encephalitis, myelitis, and encephalomyelitis
Intracranial and intraspinal abscess, and granuloma, phlebitis, and thrombophlebitis
Sequelae of inflammatory diseases of central nervous system

7. Systematic Atrophies Primarily Affecting the Central Nervous System—G10-G14
This code block reports:
Huntington’s disease—G10
Hereditary ataxia—G11
Spinal muscular atrophy and related syndromes—G12
Systematic atrophies primarily affecting central nervous system in diseases classified elsewhere—G13
Postpolio syndrome-G14

8. Extrapyramidal and Movement Disorders—G20-G26
Disorders reported here include:
Parkinson’s disease- G20 to G21
Other degenerative diseases of basal ganglia- G23
Dystonia- G24
Other extrapyramidal and movement disorders- G25 to G26. This includes tremors, drug-induced chorea, and other drug-induced tics and movement disorders.

9. Other Degenerative Diseases of the Nervous System—G30-G32
Diseases reported here include:
Alzheimer’s disease- G30
Other degenerative diseases of the nervous system not elsewhere classified- G31
Other degenerative diseases of the nervous system in diseases classified elsewhere- G32

10. Demyelinating Diseases of the Central Nervous System—G35-G37
The following disorders are reported here:
Multiple sclerosis—G35
Other acute disseminated demyelination—G36
Other demyelinating diseases of the central nervous system—G37

11. Episodic and Paroxysmal Disorders—G40-G47
Categories reported here include:
Epilepsy and recurrent seizures—G40
Migraine—G43
Other headache syndromes—G44
Transient cerebral ischemic attacks and related syndromes—G45
Vascular syndromes of brain in cerebrovascular diseases—G46
Sleep disorders—G47

12. Nerve, Nerve Root, and Plexus Disorders—G50-G59
This block of codes reports:
Disorders of trigeminal nerve—G50
Facial nerve disorders—G51
Disorders of other cranial nerves—G52
Cranial nerve disorders in diseases classified elsewhere—G53
Nerve root and plexus disorders—G54
Nerve root and plexus compressions in diseases classified elsewhere—G55
Mononeuropathies upper and lower limb—G56-G57
Other Mononeuropathies—G58
Mononeuropathy in diseases classified elsewhere- G59

13. Polyneuropathies and Other Disorders of the Peripheral Nervous System—G60-G65
This block of codes reports:
Hereditary and idiopathic neuropathy—G60
Inflammatory polyneuropathy—G61
Other and unspecified polyneuropathies—G62
Polyneuropathy in diseases classified elsewhere—G63
Other disorders of the peripheral nervous system—G64
Sequelae of inflammatory and toxic polyneuropathies—G65

14. Diseases of Myoneural Junction and Muscle—G70-G73
This block of codes reports:
Myasthenia gravis and other myoneural disorders—G70
Primary disorders of muscles—G71
Other and unspecified myopathies—G72
Disorders of myoneural junction and muscle in diseases classified elsewhere—G73

15. Cerebral Palsy and Other Paralytic Syndromes—G80-G83
These categories report:
Cerebral palsy—G80
Hemiplegia and hemiparesis—G81
Paraplegia and quadriplegia—G82
Other paralytic syndromes—G83

16. Other Disorders of the Nervous System—G89-G99
Diseases reported here include:
Pain- G89
Disorders of autonomic nervous system- G90
Hydrocephalus- G91
Toxic encephalopathy- G92
Other disorders of the brain, spinal cord, and central nervous system- G93 to G96
Intraoperative and postprocedural complications and disorders of nervous system- G97

17. Categories G98 and G99
Other disorders of nervous system, not elsewhere classified- G98
Other disorders of nervous system in diseases classified elsewhere- G99

18. Official Guidelines for Coding and Reporting
The Official Guidelines address the following:
Dominant/nondominant side
Pain—Category G89
Pain due to devices, implants, and grafts
Postoperative pain
Chronic pain
Neoplasm-related pain
Chronic pain syndrome

19. Coding Practice
Select the correct code for:
Acquired torsion dystonia

20. Coding Practice Solution
Main term to reference in index:
Dystonia
Modifying term:
Torsion, then acquired
Code Assignment:
G24.8