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ICD-9 to ICD-10 Crosswalk

The codes in these crosswalks were selected based on the most commonly used ICD-9 codes according to historical MedStar Health coding data and from professional coding associations, and are ordered by frequency of use. 

Not all the codes you need are contained in this list. For a comprehensive list of ICD-10 codes, use Diagnosis Assistant or the IMO Anywhere tool.

Code Description (ICD-9 codes are in blue)
327.23 Obstructive sleep apnea (adult)(pediatric)
G47.33 Obstructive sleep apnea (adult)(pediatric)
780.39 Other convulsions
R56.9 Unspecified convulsions
R56.00 Simple febrile convulsions
R56.01
Complex febrile convulsions
R56.1
Post traumatic seizures
340 Multiple sclerosis
G35 Multiple sclerosis
332.0 Paralysis agitans
G20 Parkinson's disease
G21.4 Vascular Parkinsonism
354.0 Carpal tunnel syndrome
G56.00 Carpal tunnel syndrome, unspecified upper limb
G56.01 Carpal tunnel syndrome, right upper limb
G56.02
Carpal tunnel syndrome, left upper limb
782.0 Disturbance of skin sensation
R20.0 Anesthesia of skin
R20.1 Hypoesthesia of skin
R20.2
Paresthesia of skin
R20.3
Hyperesthesia
R20.8
Other disturbances of skin
R20.9
Unspecified disturbances of skin sensation
345.41 Localized-related (focal)(partial) epilepsy and epileptic syndromes with complex partial seizures, with intractable epilepsy

Note: The following terms are to be considered equivalent to intractable: pharmacoresistant (pharmacologically resistant), treatment resistant, refractory (medically), and poorly controlled.
G40.211 Localized-related (focal)(panial) symptomatic epilepsy and epileptic syndromes with complex partial seizures, intractable, with status epilepticus
G40.219
Localized-related (focal){partial) symptomatic epilepsy and epileptic syndromes with complex partial seizures, intractable, without status epilepticus
724.4 Thoracic or lumbosacral neuritis or radiculitis, unspecified
M51.14 Intervertebral disc disorders with radiculopathy, thoracic region
M51.15 Intervertebral disc disorders with radiculopathy, thoracolumbar region
M51.16
Intervertebral disc disorders with radiculopathy, lumbar region
M51.17
Intervertebral disc disorders with radiculopathy, lumbosacral region
M54.14
Radiculopathy, thoracic region
M54.15
Radiculopathy, thoracolumbar region
M54.16
Radiculopathy, lumbar region
M54.17
Radiculopathy, lumbosacral region
356.4 Idiopathic progressive polyneuropathy
G60.3 Idiopathic progressive polyneuropathy
345.40 Localization-related (focal)(partial) epilepsy and epileptic syndromes, with complex partial seizures, without mention of intractable epilepsy

Note: The following terms are to be considered equivalent to intractable: pharmacoresistant (pharmacologically resistant), treatment resistant, refractory (medically), and poorly controlled.
G40.201 Localization-related (focal)(partial) epilepsy and epileptic syndromes with complex partial seizures, not intractable, with status epilepticus
G40.209
Localization-related (focal)(partial) epilepsy and epileptic syndromes with complex partial seizures, not intractable, without status epilepticus
786.09 Respiratory abnormality other
R06.89 Other abnormalities of breathing
R06.00 Dyspnea, unspecified
R06.01
Orthopnea
R06.02
Shortness of breath
R06.09
Other forms of dyspnea
R06.1
Stridor
R06.2
Wheezing
R06.3
Periodic breathing
R06.4
Hyperventilation
R06.5
Mouth breathing
R06.6
Hiccough 
R06.7
Sneezing
R06.81
Apnea, not elsewhere classified
R06.82
Tachypnea, not elsewhere classified
R06.83
Snoring
345.10 Generalized convulsive epilepsy without mention of intractable epilepsy

Note: The following terms are to be considered equivalent to intractable: pharmacoresistant (pharmacologically resistant), treatment resistant, refractory (medically), and poorly controlled.

* Code also MERRF syndrome, if applicable (E88.42)
G40.301
Generalized idiopathic epilepsy and epileptic syndromes, not intractable, with status epilepticus
G40.309
Generalized idiopathic epilepsy and epileptic syndromes, not intractable, without status epilepticus
354.2 Lesion of ulnar nerve
G56.20 Lesion of ulnar nerve, unspecified upper limb
G56.21 Lesion of ulnar nerve, right upper limb
G56.22
Lesion of ulnar nerve, left upper limb
335.20 Amyotrophic lateral sclerosis
G12.21 Amyotrophic lateral sclerosis
333.1 Essential and other specified forms of tremor
G25.0 Essential tremor
G25.1  Drug-induced tremor

* Use additional code for adverse effect, if applicable, to identify drug (T36-TSO with fifth or sixth character 5)
G25.2
Other specified forms of tremor
723.4 Brachial neuritis or radiculitis, NOS
M50.10 Cervical disc disorder with radiculopathy, unspecified cervical region
M50.11 Cervical disc disorder with radiculopathy, occipita· atlanto-axial region
M50.12
Cervical disc disorder with radiculopathy, mid-cervical region
M50.13
Cervical disc disorder with radiculopathy, cervicothoracic region
M54.11
Radiculopathy, occitito-atlanto-axial region
M54.12
Radiculopathy, cervical region
M54.13
Radiculopathy, cervicothoracic region
781.2 Abnormality of gait
R26.9 Unspecified abnormalities of gait and mobility
R26.0 Ataxic gait
R26.1
Paralytic gait
R26.2
Difficulty in walking, not elsewhere classified
R26.81
Unsteadiness on feet
R26.89
Other abnormalities of gait and mobility
333.0 Other degenerative diseases of the basal ganglia
G23.9 Degenerative disease of basal ganglia, unspecified
G23.0 Hallervorden-Spatz disease
G23.1
Progressive supra nuclear ophthalmoplegia [SteeleRichardson-Oiszewski]
G23.2
Striatonigral degeneration
G23.8
Other specified degenerative diseases of basal ganglia
G90.3
Multi-system degeneration of the autonomic nervous system
345.11 Generalized convulsive epilepsy with intractable epilepsy

Note: The following terms are to be considered equivalent to intractable: pharmacoresistant (pharmacologically resistant), treatment resistant, refractory (medically), and poorly controlled.

* Code also MERRF syndrome, if applicable (E88.42)
G40.311
Generalized idiopathic epilepsy and epileptic syndromes, intractable with status epilepticus
G40.319
Generalized idiopathic epilepsy and epileptic syndromes, intractable without status epilepticus
333.83 Spasmodic torticollis
G24.3 Spasmodic torticollis
356.9 Unspecified idiopathic peripheral neuropathy
G60.9 Hereditary and idiopathic neuropathy, unspecified
G60.0 Hereditary motor and sensory neuropathy
G60.1
Refsum's disease
G60.2
Neuropathy in association with hereditary ataxia
G60.3
Idiopathic progressive neuropathy
G60.8
Other hereditary and idiopathic neuropathies
729.5 Pain in limb
M79.609 Pain in unspecified limb
M79.601 Pain in right arm
M79.602
Pain in left arm
M79.603
Pain in arm, unspecified
M79.604
Pain in right leg
M79.605
Pain in left leg
M79.606
Pain in leg, unspecified
M79.621
Pain in right upper arm
M79.622
Pain in left upper arm
M79.629
Pain in unspecified upper arm
M79.631
Pain in right forearm
M79.632
Pain in left forearm
M79.639
Pain in unspecified forearm
M79.641
Pain in right hand
M79.642
Pain in left hand
M79.643
Pain in unspecified hand
M79.644
Pain in right finger(s)
M79.645
Pain in left finger(s)
M79.646
Pain in unspecified finger(s)
M79.651
Pain in right thigh
M79.652
Pain in left thigh
M79.659
Pain in unspecified thigh
M79.661
Pain in right lower leg
M79.662
Pain in left lower leg
M79.669
Pain in unspecified lower leg
M79.671
Pain in right foot
M79.672
Pain in left foot
M79.673
Pain in unspecified foot
M79.674
Pain in right toe(s)
M79.675
Pain in left toe(s)
M79.679
Pain in unspecified roes(s)
346.11 Migraine without aura, with intractable migraine, so stated, without mention of status migrainosus

Note: The following terms are to be considered equivalent to intractable: pharmacoresistant (pharmacologically resistant), treatment resistant, refractory (medically), and poorly controlled.
G43.019 Migraine without aura, intractable, without status migrainosus
327.10 Organic hypersomnia, unspecified
G47.10 Hypersomnia, unspecified
G47.11 Idiopathic hypersomnia with long sleep time
G47.12
Idiopathic hypersomnia without long sleep time
G47.13
Recurrent hypersomnia
G47.14
Hypersomnia due to medical condition
G47.19
Other hypersomnia
358.00 Myasthenia gravis without (acute) exacerbation
G70.00 Myasthenia gravis without (acute) exacerbation
784.0 Headache
R51 Headache
G44.1 Vascular headache, not elsewhere classified
345.90 Epilepsy, unspecified, without mention of intractable epilepsy

Note: The following terms are to be considered equivalent to intractable: pharmacoresistant (pharmacologically resistant), treatment resistant, refractory (medically), and poorly controlled.
G40.901 Epilepsy, unspecified, not intractable, with status epilepticus
G40.909
Epilepsy, unspecified, not intractable, without status epilepticus
V12.54 Personal history of transient ischemic attack (TIA), and cerebral infarction without residual deficits
Z86.73
Personal history of transient ischemic attack (TIA) and cerebral infarction without residual deficits
780.4 Dizziness and giddiness
R42 Dizziness and giddiness
346.01 Migraine with aura, with intractable migraine, so stated, without mention of status migrainosis

Note: The following terms are to be considered equivalent to intractable: pharmacoresistant (pharmacologically resistant), treatment resistant, refractory (medically), and poorly controlled mention of status migrainosus.
G43.119 Migraine with aura, intractable, without status migrainosus
781.0 Abnormal involuntary movements

Documentation should include if abnormal involuntary movements are of the head or other part of body and if they constitute a tremor, cramp, spasm, fasciculation, or other involuntary movement. ICD-10 options include:
R25.0 Abnormal head movements
R25.1 Tremor, unspecified
R25.2
Cramp and spasm
R25.3
Fasciculaton
R25.8
Other abnormal involuntary movements
R25.9
Unspecified abnormal involuntary movements
357.9 Unspecified inflammatory and toxic neuropathies
G61.9 Inflammatory polyneuropathy, unspecified
G61 .0 Guillain-Barre syndrome
G61.1
Serum neuropathy

* Use additional code for adverse effect, if applicable, to identify serum (T50.-)
G61.81
Chronic inflammatory demyelinating polyneuritis
G61.89
Other inflammatory polyneuropathies
G61.9
Inflammatory polyneuropathy, unspecified
G62.0
Drug-induced polyneuropathy

** Use additional code for adverse effect, if applicable, to identify drug (T36-T50 with fifth or sixth character 5)
G62.1
Alcoholic polyneuropathy
G62.2
Polyneuropathy due to other toxic agents

* Code first (T51-T65) to identify toxic agent
G62.81
Critical illness polyneuropathy
G62.82
Radiation-induced polyneuropathy

*** Use additional external cause code (W88-W90, X39.0-) to identify cause
G62.89
Other specified polyneuropathy
G62.9
Polyneuropathy, unspecified
780.93 Memory loss
R41.3 Other amnesia
R41.1 Antegrade amnesia
R41.2
Retrograde amnesia
435.9 Unspecified transient cerebral ischemia
G45.9 Transient cerebral ischemic attack, unspecified
G45.0 Vertebral-basilar artery syndrome
G45.1
Carotid artery syndrome (hemispheric)
G45.2
Multiple and bilateral precerebral artery syndromes
G45.3
Amaurosis fugal
G45.4
Transient global amnesia
G45.8
Other Transient cerebral ischemic attacks and related syndromes
780.2 Syncope and collapse
R55 Syncope and collapse
377.30 Optic neuritis, unspecified
H46.9 Unspecified optic neuritis
H46.00 Optic papillitis, unspecified eye
H46.01
Optic papillitis, right eye
H46.02
Optic papillitis, left eye
H46.03
Optic papillitis, bilateral
H46.10
Retrobulbar neuritis, unspecified eye
H46.11
Retrobulbar neuritis, right eye
H46.12
Retrobulbar neuritis, left eye
H46.13
Retrobulbar neuritis, bilateral
H46.2
Nutritional optic neuropathy
H46.3
Toxic optic neuropathy
H46.8
Other optic neuritis
438.89 Other late effects of cerebrovascular disease
I69.998 Other sequelae following unspecified cerebrovascular disease
I69.898 Other sequelae of other cerebrovascular disease
I69.098
Other sequelae following nontraumatic subarachnoid hemorrhage
I69.198
Other sequelae of nontraumatic intracerebral hemorrhage
I69.298
Other sequelae of other nontraumatic intracranial hemorrhage
I69.398
Other sequelae of cerebral infarction

* Use additional code to identify the sequelae for the above IC0-10-CM codes
I69.890
Apraxia following other cerebrovascular disease
I69.891
Dysphagia following other cerebrovascular disease

** Use additional code to identify the type of dysphagia, if known (R13.1-)
I69.892
Facial weakness following other cerebrovascular disease
I69.893
Ataxia following other cerebrovascular disease
780.79 Other malaise and fatigue
R53.81 Other malaise
R53.83 Other fatigue
R53.82
Chronic fatigue, unspecified
G93.3
Postviral fatigue syndrome
R53.0
Neoplastic (malignant) related fatigue

* Code first associated neoplasm
R53.1
Weakness
724.2 Lumbago
M54.5 Low back pain
346.10 Migraine without aura, without mention of intractable migraine, without mention of status migrainosus

Note: The following terms are to be considered equivalent to intractable: pharmacoresistant (pharmacologically resistant), treatment resistant, refractory (medically), and poorly controlled.
G43.009 Migraine without aura, not intractable, without status migrainosus
327.00 Organic insomnia, unspecified
G47.00 Insomnia, unspecified
G47.01 Insomnia due to medical condition
G47.09
Other insomnia
357.81 Chronic inflammatory demyelinating polyneuritis
G61.81 Chronic inflammatory demyelinating polyneuritis
345.51 Localization-related (focal)(partial) epilepsy and epileptic syndromes with simple partial seizures, with intractable epilepsy

Note: The following terms are to be considered equivalent to intractable: pharmacoresistant (pharmacologically resistant), treatment resistant, refractory (medically), and poorly controlled.
G40.011 Localization-related (focal)(partial) idiopathic epilepsy and epileptic syndromes with seizures of localized onset, intractable, with status epilepticus
G40.019
Localization-related (focal)(partial) idiopathic epilepsy and epileptic syndromes with seizures of localized onset, intractable, without status epilepticus
G40.111
Localization-related (focal)(partial) symptomatic epilepsy and epileptic syndromes with simple partial seizures, intractable, with status epilepticus
G40.119
Localization-related (focal)(partial) symptomatic epilepsy and epileptic syndromes with simple partial seizures, intractable, without status epilepticus
347.00 Narcolepsy without cataplexy
G47.419 Narcolepsy without cataplexy
346.90 Migraine unspecified, without mention of intractable migraine without mention of status migrainosus

Note: The following terms are to be considered equivalent to intractable: pharmacoresistant (pharmacologically resistant), treatment resistant. refractory (medically), and poorly controlled.

Important to note if intractable or with or without status migrainosus. ICD-10 options include:
G43.909 Migraine, unspecified, not intractable, without status migrainosus
G43.919 Migraine, unspecified, intractable, without status migrainosus
G43.901 Migraine, unspecified, not intractable, with status migrainosus
723.1 Cervicalgia
M54.2 Cervicalgia
434.91 Cerebral artery occlusion unspecified with cerebral infarction

Multiple specific diagnosis choices are present under ICD-10 for Cerebral artery infarction. Documentation should note the specific cerebral artery (when possible) with an occlusion or stenosis and the laterality where applicable. Examples include:
I63.511 Cerebral infarction due to unspecified occlusion or stenosis of right middle cerebral artery
I63.512 Cerebral infarction due to unspecified occlusion or stenosis of left middle cerebral artery
I63.519
Cerebral infarction due to unspecified occlusion or stenosis of unspecified middle cerebral artery
I63.529
Cerebral infarction due to unspecified occlusion or stenosis of unspecified anterior cerebral artery
I63.531
Cerebral infarction due to unspecified occlusion or stenosis of right posterior cerebral artery
I63.532
Cerebral infarction due to unspecified occlusion or stenosis of left posterior cerebral artery
346.00 Migraine with aura, without mention of intractable migraine, without mention of status migrainosus

Note: The following terms are to be considered equivalent to intractable: pharmacoresistant (pharmacologically resistant), treatment resistant, refractory (medically), and poorly controlled.
G43.109 Migraine with aura, not intractable, without status migrainosus
307.42 Persistent disorder of initiating or maintaining
G47.01 Insomnia due to medical condition
G47.00 Insomnia, unspecified
G47.09
Other insomnia
F51.01
Primary insomnia
F51.02
Adjustment insomnia
F51.03
Paradoxical insomnia
F51.04
Psychophysiologic insomnia
F51.09
Other insomnia not due to a substance or known physiological condition
780.97 Altered mental status
R41.0 Disorientation, unspecified
R41.82 Altered mental status, unspecified
331.82 Dementia with Lewy bodies
G31.83 Dementia with Lewy bodies
346.71 Chronic migraine without aura, with intractable migraine, so stated, without mention of status migrainosus
G43.719 Chronic migraine without aura, intractable, without status migrainosus
333.81 Blepharospasm
G24.5 Blepharospasm
348.30 Encephalopathy, unspecified
G93.40 Encephalopathy, unspecified
724.02 Spinal stenosis, lumbar region, without neurogenic claudication
M48.06 Spinal stenosis, lumbar region
M48.07
Spinal stenosis, lumbosacral region
M99.23
Subluxation stenosis of neural canal of lumbar region
M99.33
Osseous stenosis of neural canal of lumbar region
M99.43
Connective tissue stenosis of neural canal of lumbar region
M99.53
Intervertebral disc stenosis of neural canal of lumbar region
M99.63
Osseous and subluxation stenosis of intervertebral foramina of lumbar region
M99.73
Connective tissue and disc stenosis of intervertebral foramina of lumbar region
999 Complications of medical care not elsewhere classified

No equivalent codes are present under ICD-10
344.1 Paraplegia
G04.1 Tropical spastic paraplegia
G82.21 Paraplegia, complete
G82.22
Paraplegia, incomplete
ICD-9 Intracerebral hemorrhage
I61.0 Nontraumatic intracerebral hemorrhage in hemisphere, subcortical
I61.1 Nontraumatic intracerebral hemorrhage in hemisphere, cortical
I61.2
Nontraumatic intracerebral hemorrhage in hemisphere, unspecified
I61.3
Nontraumatic intracerebral hemorrhage in brain stem
I61.4
Nontraumatic intracerebral hemorrhage in cerebellum
I61.05
Nontraumatic intracerebral hemorrhage, intraventricular
I61.6
Nontraumatic intracerebral hemorrhage, multiple localized

When the bleeding source is indiscernible or other area, codes include:
I61.9
Nontraumatic intracerebral hemorrhage, unspecified
I61.8
Other nontraumatic intracerebral hemorrhage
780.09 Alteration of consciousness other

If coma symptoms, document response to pain, sound, motor, and spontaneous movement 24 hours and more post admission to derive code. Multiple examples (not comprehensive) of diagnosis based on coma scale noted below:
R40.2123 Coma scale, eyes open, to pain, at hospital admission
R40.2124
Coma scale, eyes open, to pain, 24 hours or more after hospital admission
R40.2134
Coma scale, eyes open, to sound, 24 hours or more after hospital admission
R40.2144
Coma scale, eyes open, spontaneous, 24 hours or more after hospital admission
R40.2114
Coma scale, eyes open, never, 24 hours or more after hospital admission
R40.2314
Coma scale, best motor response, none, 24 hours or more after hospital admission
R40.2334
Coma scale, best motor response, abnormal, 24 hours or more after hospital admission

Other codes for alteration of consciousness include:
R40.0
Somnolence
R40.1
Stupor
847.0 Neck sprain

Note if initial or subsequent encounter. Differentiate between strain and sprain if applicable:
S13.4XXA Sprain of ligaments of cervical spine, initial encounter
S13.8XXA
Sprain of joints and ligaments of other parts of neck, initial encounter
S16.1XXA
Strain of muscle, fascia and tendon at neck level, initial encounter
780.02 Transient alteration of awareness
R40.4 Transient alteration of awareness
401.9 Unspecified essential hypertension

Specific types of hypertension should be noted. ICD-10 options include:
I15.1 Hypertension secondary to other renal disorders
I15.2
Hypertension secondary to endocrine disorders
I15.0
Renovascular hypertension
O10 Pre-existing hypertension complicating pregnancy, childbirth and the puerperium
O11 Pre-existing hypertension with pre-eclampsia
I10
Essential (primary) hypertension
I15.9
Secondary hypertension, unspecified
I97.3 Postprocedural hypertension
K76.6 Portal hypertension
355.9 Mononeuritis of unspecified site
E08.41 Diabetes mellitus due to underlying condition with diabetic mononeuropathy
E09.41 Drug or chemical induced diabetes mellitus with neurological complications with diabetic mononeuropathy
E10.41
Type 1 diabetes mellitus with diabetic mononeuropathy
E11.41
Type 2 diabetes mellitus with diabetic mononeuropathy
E13.41
Other specified diabetes mellitus with diabetic mononeuropathy
G58.8 Other specified mononeuropathies
G59 Mononeuropathy in diseases classified elsewhere
728.87 Muscle weakness (generalized)
M62.81 Muscle weakness (generalized)
723.0 Spinal stenosis in cervical region
M48.02 Spinal stenosis, cervical region
M48.03 Spinal stenosis, cervicothoracic region
M99.20
Subluxation stenosis of neural canal of head region
M99.21
Subluxation stenosis of neural canal of cervical region
M99.30
Osseous stenosis of neural canal of head region
M99.31
Osseous stenosis of neural canal of cervical region
M99.40
Connective tissue stenosis of neural canal of head region
M99.41
Connective tissue stenosis of neural canal of cervical region
M99.50
Intervertebral disc stenosis of neural canal of head region
M99.51
Intervertebral disc stenosis of neural canal of cervical region
M99.60
Osseous and subluxation stenosis of intervertebral foramina of head region
M99.61
Osseous and subluxation stenosis of intervertebral foramina of cervical region
M99.70
Connective tissue and disc stenosis of intervertebral foramina of head region
M99.71
Connective tissue and disc stenosis of intervertebral foramina of cervical region