G00-G99254 V28 risk-adjusting codes
Diseases of the nervous system
ICD-10-CM Chapter 6 (G00-G99) in the FY2026 code set. 254 codes in this chapter map to a CMS-HCC V28 payment category, across 20 HCC categories.
CMS-HCC V28 categories in this chapter (20)
Open any category for its full member-code list, RAF, and hierarchy.
- HCC 201 Seizure Disorders and Convulsions59
- HCC 254 Monoplegia, Other Paralytic Syndromes23
- HCC 182 Spinal Cord Disorders/Injuries21
- HCC 197 Muscular Dystrophy21
- HCC 198 Multiple Sclerosis20
- HCC 127 Dementia, Mild or Unspecified18
- HCC 200 Friedreich and Other Hereditary Ataxias; Huntington Disease17
- HCC 199 Parkinson and Other Degenerative Disease of Basal Ganglia16
- HCC 253 Hemiplegia/Hemiparesis15
- HCC 190 Amyotrophic Lateral Sclerosis and Other Motor Neuron Disease, Spinal Muscular Atrophy11
- HCC 196 Myasthenia Gravis without (Acute) Exacerbation and Other Myoneural Disorders9
- HCC 192 Cerebral Palsy, Except Quadriplegic6
- HCC 180 Quadriplegia5
- HCC 181 Paraplegia3
- HCC 202 Coma, Brain Compression/Anoxic Damage3
- HCC 409 Amputation Status, Lower Limb/Amputation Complications2
- HCC 193 Chronic Inflammatory Demyelinating Polyneuritis and Multifocal Motor Neuropathy2
- HCC 195 Myasthenia Gravis with (Acute) Exacerbation1
- HCC 93 Rheumatoid Arthritis and Other Specified Inflammatory Rheumatic Disorders1
- HCC 191 Quadriplegic Cerebral Palsy1
Risk-adjusting ICD-10-CM codes (254)
Codes in this chapter that map to a CMS-HCC V28 payment category. Open any code for its full detail.
- G04.1Tropical spastic paraplegia
- G04.82Acute flaccid myelitis
- G04.89Other myelitis
- G04.91Myelitis, unspecified
- G05.4Myelitis in diseases classified elsewhere
- G10Huntington's disease
- G11.0Congenital nonprogressive ataxia
- G11.10Early-onset cerebellar ataxia, unspecified
- G11.11Friedreich ataxia
- G11.19Other early-onset cerebellar ataxia
- G11.2Late-onset cerebellar ataxia
- G11.3Cerebellar ataxia with defective DNA repair
- G11.4Hereditary spastic paraplegia
- G11.5Hypomyelination - hypogonadotropic hypogonadism - hypodontia
- G11.6Leukodystrophy with vanishing white matter disease
- G11.8Other hereditary ataxias
- G11.9Hereditary ataxia, unspecified
- G12.0Infantile spinal muscular atrophy, type I [Werdnig-Hoffman]
- G12.1Other inherited spinal muscular atrophy
- G12.20Motor neuron disease, unspecified
- G12.21Amyotrophic lateral sclerosis
- G12.22Progressive bulbar palsy
- G12.23Primary lateral sclerosis
- G12.24Familial motor neuron disease
- G12.25Progressive spinal muscle atrophy
- G12.29Other motor neuron disease
- G12.8Other spinal muscular atrophies and related syndromes
- G12.9Spinal muscular atrophy, unspecified
- G14Postpolio syndrome
- G20.A1Parkinson's disease without dyskinesia, without mention of fluctuations
- G20.A2Parkinson's disease without dyskinesia, with fluctuations
- G20.B1Parkinson's disease with dyskinesia, without mention of fluctuations
- G20.B2Parkinson's disease with dyskinesia, with fluctuations
- G20.CParkinsonism, unspecified
- G21.3Postencephalitic parkinsonism
- G21.4Vascular parkinsonism
- G21.8Other secondary parkinsonism
- G21.9Secondary parkinsonism, unspecified
- G23.0Hallervorden-Spatz disease
- G23.1Progressive supranuclear ophthalmoplegia [Steele-Richardson-Olszewski]
- G23.2Striatonigral degeneration
- G23.3Hypomyelination with atrophy of the basal ganglia and cerebellum
- G23.8Other specified degenerative diseases of basal ganglia
- G23.9Degenerative disease of basal ganglia, unspecified
- G30.0Alzheimer's disease with early onset
- G30.1Alzheimer's disease with late onset
- G30.8Other Alzheimer's disease
- G30.9Alzheimer's disease, unspecified
- G31.01Pick's disease
- G31.09Other frontotemporal neurocognitive disorder
- G31.80Leukodystrophy, unspecified
- G31.81Alpers disease
- G31.82Leigh's disease
- G31.83Neurocognitive disorder with Lewy bodies
- G31.86Alexander disease
- G32.0Subacute combined degeneration of spinal cord in diseases classified elsewhere
- G32.81Cerebellar ataxia in diseases classified elsewhere
- G35Multiple sclerosis
- G35.ARelapsing-remitting multiple sclerosis
- G35.B0Primary progressive multiple sclerosis, unspecified
- G35.B1Active primary progressive multiple sclerosis
- G35.B2Non-active primary progressive multiple sclerosis
- G35.C0Secondary progressive multiple sclerosis, unspecified
- G35.C1Active secondary progressive multiple sclerosis
- G35.C2Non-active secondary progressive multiple sclerosis
- G35.DMultiple sclerosis, unspecified
- G36.0Neuromyelitis optica [Devic]
- G36.1Acute and subacute hemorrhagic leukoencephalitis [Hurst]
- G36.8Other specified acute disseminated demyelination
- G36.9Acute disseminated demyelination, unspecified
- G37.0Diffuse sclerosis of central nervous system
- G37.1Central demyelination of corpus callosum
- G37.2Central pontine myelinolysis
- G37.3Acute transverse myelitis in demyelinating disease of central nervous system
- G37.4Subacute necrotizing myelitis of central nervous system
- G37.5Concentric sclerosis [Balo] of central nervous system
- G37.81Myelin oligodendrocyte glycoprotein antibody disease
- G37.89Other specified demyelinating diseases of central nervous system
- G37.9Demyelinating disease of central nervous system, unspecified
- G40.001Localization-related (focal) (partial) idiopathic epilepsy and epileptic syndromes with seizures of localized onset, not intractable, with status epilepticus
- G40.009Localization-related (focal) (partial) idiopathic epilepsy and epileptic syndromes with seizures of localized onset, not intractable, without status epilepticus
- G40.011Localization-related (focal) (partial) idiopathic epilepsy and epileptic syndromes with seizures of localized onset, intractable, with status epilepticus
- G40.019Localization-related (focal) (partial) idiopathic epilepsy and epileptic syndromes with seizures of localized onset, intractable, without status epilepticus
- G40.101Localization-related (focal) (partial) symptomatic epilepsy and epileptic syndromes with simple partial seizures, not intractable, with status epilepticus
- G40.109Localization-related (focal) (partial) symptomatic epilepsy and epileptic syndromes with simple partial seizures, not intractable, without status epilepticus
- G40.111Localization-related (focal) (partial) symptomatic epilepsy and epileptic syndromes with simple partial seizures, intractable, with status epilepticus
- G40.119Localization-related (focal) (partial) symptomatic epilepsy and epileptic syndromes with simple partial seizures, intractable, without status epilepticus
- G40.201Localization-related (focal) (partial) symptomatic epilepsy and epileptic syndromes with complex partial seizures, not intractable, with status epilepticus
- G40.209Localization-related (focal) (partial) symptomatic epilepsy and epileptic syndromes with complex partial seizures, not intractable, without status epilepticus
- G40.211Localization-related (focal) (partial) symptomatic epilepsy and epileptic syndromes with complex partial seizures, intractable, with status epilepticus
- G40.219Localization-related (focal) (partial) symptomatic epilepsy and epileptic syndromes with complex partial seizures, intractable, without status epilepticus
- G40.301Generalized idiopathic epilepsy and epileptic syndromes, not intractable, with status epilepticus
- G40.309Generalized idiopathic epilepsy and epileptic syndromes, not intractable, without status epilepticus
- G40.311Generalized idiopathic epilepsy and epileptic syndromes, intractable, with status epilepticus
- G40.319Generalized idiopathic epilepsy and epileptic syndromes, intractable, without status epilepticus
- G40.401Other generalized epilepsy and epileptic syndromes, not intractable, with status epilepticus
- G40.409Other generalized epilepsy and epileptic syndromes, not intractable, without status epilepticus
- G40.411Other generalized epilepsy and epileptic syndromes, intractable, with status epilepticus
- G40.419Other generalized epilepsy and epileptic syndromes, intractable, without status epilepticus
- G40.42Cyclin-Dependent Kinase-Like 5 Deficiency Disorder
- G40.501Epileptic seizures related to external causes, not intractable, with status epilepticus
- G40.509Epileptic seizures related to external causes, not intractable, without status epilepticus
- G40.801Other epilepsy, not intractable, with status epilepticus
- G40.802Other epilepsy, not intractable, without status epilepticus
- G40.803Other epilepsy, intractable, with status epilepticus
- G40.804Other epilepsy, intractable, without status epilepticus
- G40.811Lennox-Gastaut syndrome, not intractable, with status epilepticus
- G40.812Lennox-Gastaut syndrome, not intractable, without status epilepticus
- G40.813Lennox-Gastaut syndrome, intractable, with status epilepticus
- G40.814Lennox-Gastaut syndrome, intractable, without status epilepticus
- G40.821Epileptic spasms, not intractable, with status epilepticus
- G40.822Epileptic spasms, not intractable, without status epilepticus
- G40.823Epileptic spasms, intractable, with status epilepticus
- G40.824Epileptic spasms, intractable, without status epilepticus
- G40.833Dravet syndrome, intractable, with status epilepticus
- G40.834Dravet syndrome, intractable, without status epilepticus
- G40.841KCNQ2-related epilepsy, not intractable, with status epilepticus
- G40.842KCNQ2-related epilepsy, not intractable, without status epilepticus
- G40.843KCNQ2-related epilepsy, intractable, with status epilepticus
- G40.844KCNQ2-related epilepsy, intractable, without status epilepticus
- G40.89Other seizures
- G40.901Epilepsy, unspecified, not intractable, with status epilepticus
- G40.909Epilepsy, unspecified, not intractable, without status epilepticus
- G40.911Epilepsy, unspecified, intractable, with status epilepticus
- G40.919Epilepsy, unspecified, intractable, without status epilepticus
- G40.A01Absence epileptic syndrome, not intractable, with status epilepticus
- G40.A09Absence epileptic syndrome, not intractable, without status epilepticus
- G40.A11Absence epileptic syndrome, intractable, with status epilepticus
- G40.A19Absence epileptic syndrome, intractable, without status epilepticus
- G40.B01Juvenile myoclonic epilepsy, not intractable, with status epilepticus
- G40.B09Juvenile myoclonic epilepsy, not intractable, without status epilepticus
- G40.B11Juvenile myoclonic epilepsy, intractable, with status epilepticus
- G40.B19Juvenile myoclonic epilepsy, intractable, without status epilepticus
- G40.C01Lafora progressive myoclonus epilepsy, not intractable, with status epilepticus
- G40.C09Lafora progressive myoclonus epilepsy, not intractable, without status epilepticus
- G40.C11Lafora progressive myoclonus epilepsy, intractable, with status epilepticus
- G40.C19Lafora progressive myoclonus epilepsy, intractable, without status epilepticus
- G54.6Phantom limb syndrome with pain
- G54.7Phantom limb syndrome without pain
- G61.81Chronic inflammatory demyelinating polyneuritis
- G61.82Multifocal motor neuropathy
- G70.00Myasthenia gravis without (acute) exacerbation
- G70.01Myasthenia gravis with (acute) exacerbation
- G70.1Toxic myoneural disorders
- G70.2Congenital and developmental myasthenia
- G70.80Lambert-Eaton syndrome, unspecified
- G70.81Lambert-Eaton syndrome in disease classified elsewhere
- G70.89Other specified myoneural disorders
- G70.9Myoneural disorder, unspecified
- G71.00Muscular dystrophy, unspecified
- G71.01Duchenne or Becker muscular dystrophy
- G71.02Facioscapulohumeral muscular dystrophy
- G71.031Autosomal dominant limb girdle muscular dystrophy
- G71.032Autosomal recessive limb girdle muscular dystrophy due to calpain-3 dysfunction
- G71.033Limb girdle muscular dystrophy due to dysferlin dysfunction
- G71.0340Limb girdle muscular dystrophy due to sarcoglycan dysfunction, unspecified
- G71.0341Limb girdle muscular dystrophy due to alpha sarcoglycan dysfunction
- G71.0342Limb girdle muscular dystrophy due to beta sarcoglycan dysfunction
- G71.0349Limb girdle muscular dystrophy due to other sarcoglycan dysfunction
- G71.035Limb girdle muscular dystrophy due to anoctamin-5 dysfunction
- G71.036Limb girdle muscular dystrophy due to fukutin related protein dysfunction
- G71.038Other limb girdle muscular dystrophy
- G71.039Limb girdle muscular dystrophy, unspecified
- G71.09Other specified muscular dystrophies
- G71.11Myotonic muscular dystrophy
- G71.20Congenital myopathy, unspecified
- G71.21Nemaline myopathy
- G71.220X-linked myotubular myopathy
- G71.228Other centronuclear myopathy
- G71.29Other congenital myopathy
- G72.41Inclusion body myositis [IBM]
- G73.1Lambert-Eaton syndrome in neoplastic disease
- G73.3Myasthenic syndromes in other diseases classified elsewhere
- G80.0Spastic quadriplegic cerebral palsy
- G80.1Spastic diplegic cerebral palsy
- G80.2Spastic hemiplegic cerebral palsy
- G80.3Athetoid cerebral palsy
- G80.4Ataxic cerebral palsy
- G80.8Other cerebral palsy
- G80.9Cerebral palsy, unspecified
- G81.00Flaccid hemiplegia affecting unspecified side
- G81.01Flaccid hemiplegia affecting right dominant side
- G81.02Flaccid hemiplegia affecting left dominant side
- G81.03Flaccid hemiplegia affecting right nondominant side
- G81.04Flaccid hemiplegia affecting left nondominant side
- G81.10Spastic hemiplegia affecting unspecified side
- G81.11Spastic hemiplegia affecting right dominant side
- G81.12Spastic hemiplegia affecting left dominant side
- G81.13Spastic hemiplegia affecting right nondominant side
- G81.14Spastic hemiplegia affecting left nondominant side
- G81.90Hemiplegia, unspecified affecting unspecified side
- G81.91Hemiplegia, unspecified affecting right dominant side
- G81.92Hemiplegia, unspecified affecting left dominant side
- G81.93Hemiplegia, unspecified affecting right nondominant side
- G81.94Hemiplegia, unspecified affecting left nondominant side
- G82.20Paraplegia, unspecified
- G82.21Paraplegia, complete
- G82.22Paraplegia, incomplete
- G82.50Quadriplegia, unspecified
- G82.51Quadriplegia, C1-C4 complete
- G82.52Quadriplegia, C1-C4 incomplete
- G82.53Quadriplegia, C5-C7 complete
- G82.54Quadriplegia, C5-C7 incomplete
- G83.0Diplegia of upper limbs
- G83.10Monoplegia of lower limb affecting unspecified side
- G83.11Monoplegia of lower limb affecting right dominant side
- G83.12Monoplegia of lower limb affecting left dominant side
- G83.13Monoplegia of lower limb affecting right nondominant side
- G83.14Monoplegia of lower limb affecting left nondominant side
- G83.20Monoplegia of upper limb affecting unspecified side
- G83.21Monoplegia of upper limb affecting right dominant side
- G83.22Monoplegia of upper limb affecting left dominant side
- G83.23Monoplegia of upper limb affecting right nondominant side
- G83.24Monoplegia of upper limb affecting left nondominant side
- G83.30Monoplegia, unspecified affecting unspecified side
- G83.31Monoplegia, unspecified affecting right dominant side
- G83.32Monoplegia, unspecified affecting left dominant side
- G83.33Monoplegia, unspecified affecting right nondominant side
- G83.34Monoplegia, unspecified affecting left nondominant side
- G83.4Cauda equina syndrome
- G83.5Locked-in state
- G83.81Brown-Sequard syndrome
- G83.82Anterior cord syndrome
- G83.83Posterior cord syndrome
- G83.84Todd's paralysis (postepileptic)
- G83.89Other specified paralytic syndromes
- G83.9Paralytic syndrome, unspecified
- G90.1Familial dysautonomia [Riley-Day]
- G90.3Multi-system degeneration of the autonomic nervous system
- G90.BLMNB1-related autosomal dominant leukodystrophy
- G91.0Communicating hydrocephalus
- G91.1Obstructive hydrocephalus
- G91.2(Idiopathic) normal pressure hydrocephalus
- G91.3Post-traumatic hydrocephalus, unspecified
- G91.4Hydrocephalus in diseases classified elsewhere
- G91.8Other hydrocephalus
- G91.9Hydrocephalus, unspecified
- G93.1Anoxic brain damage, not elsewhere classified
- G93.42Megalencephalic leukoencephalopathy with subcortical cysts
- G93.43Leukoencephalopathy with calcifications and cysts
- G93.44Adult-onset leukodystrophy with axonal spheroids
- G93.45Developmental and epileptic encephalopathy
- G93.5Compression of brain
- G93.6Cerebral edema
- G93.7Reye's syndrome
- G95.0Syringomyelia and syringobulbia
- G95.11Acute infarction of spinal cord (embolic) (nonembolic)
- G95.19Other vascular myelopathies
- G95.20Unspecified cord compression
- G95.29Other cord compression
- G95.81Conus medullaris syndrome
- G95.89Other specified diseases of spinal cord
- G95.9Disease of spinal cord, unspecified
- G99.2Myelopathy in diseases classified elsewhere
Frequently asked questions
How many ICD-10-CM codes in Diseases of the nervous system risk-adjust under CMS-HCC V28?
254 ICD-10-CM codes in the G00-G99 chapter (Diseases of the nervous system) map to a CMS-HCC V28 payment category for payment year 2026.
Which CMS-HCC V28 categories do G00-G99 codes map to?
Codes in this chapter map to 20 distinct CMS-HCC V28 categories, most commonly HCC 201 (Seizure Disorders and Convulsions), HCC 254 (Monoplegia, Other Paralytic Syndromes), HCC 182 (Spinal Cord Disorders/Injuries).
What ICD-10-CM chapter is G00-G99?
G00-G99 is ICD-10-CM Chapter 6, Diseases of the nervous system, in the FY2026 code set.
Source: FY2026 ICD-10-CM Tabular (CDC/NCHS) and the CMS-HCC v28 PY2026 mapping file.