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

Diseases of the Nervous System CHAPTER 11 Diseases of the Nervous System

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.

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.

Anatomy of Nervous System © Cengage Learning 2014

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

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

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.

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

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

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

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

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

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

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

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

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

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

Coding Practice Select the correct code for: Acquired torsion dystonia

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