Classification and WHO ICD-10NA Codes

Classification and WHO ICD-10NA Codes

HIS ICHD-II code	WHO ICD-10NA code	Diagnosis [and aetiological ICD-10 code for secondary headache disorders]
1.	[G43]	Migraine
1.1	[G43.0]	Migraine without aura
1.2	[G43.1]	Migraine with aura
1.2.1	[G43.10]	Typical aura with migraine headache
1.2.2	[G43.10]	Typical aura with non-migraine headache
1.2.3	[G43.104]	Typical aura without headache
1.2.4	[G43.105]	Familial hemiplegic migraine (FHM)
1.2.5	[G43.105]	Sporadic hemiplegic migraine
1.2.6	[G43.103]	Basilar-type migraine
1.3	[G43.82]	Childhood periodic syndromes that are commonly precursors of migraine
1.3.1	[G43.82]	Cyclical vomiting
1.3.2	[G43.820]	Abdominal migraine
1.3.3	[G43.821]	Benign paroxysmal vertigo of childhood
1.4	[G43.81]	Retinal migraine
1.5	[G43.3]	Complications of migraine
1.5.1	[G43.3]	Chronic migraine
1.5.2	[G43.2]	Status migrainosus
1.5.3	[G43.3]	Persistent aura without infarction
1.5.4	[G43.3]	Migrainous infarction
1.5.5	[G43.3]+[G40.x or G41.x]1	Migraine-triggered seizure
1.6	[G43.83]	Probable migraine
1.6.1	[G43.83]	Probable migraine without aura
1.6.2	[G43.83]	Probable migraine with aura
1.6.5	[G43.83]	Probable chronic migraine
2.	[G44.2]	Tension-type headache (TTH)
2.1	[G44.2]	Infrequent episodic tension-type headache
2.1.1	[G44.20]	Infrequent episodic tension-type headache associated with pericranial tenderness
2.1.2	[G44.21]	Infrequent episodic tension-type headache not associated with pericranial tenderness
2.2	[G44.2]	Frequent episodic tension-type headache
2.2.1	[G44.20]	Frequent episodic tension-type headache associated with pericranial tenderness
v2.2.2	[G44.21]	Frequent episodic tension-type headache not associated with pericranial tenderness
2.3	[G44.2]	Chronic tension-type headache
2.3.1	[G44.22]	Chronic tension-type headache associated with pericranial tenderness
2.3.2	[G44.23]	Chronic tension-type headache not associated with pericranial tenderness
2.4	[G44.28]	Probable tension-type headache
2.4.1	[G44.28]	Probable infrequent episodic tension-type headache
2.4.2	[G44.28]	Probable frequent episodic tension-type headache
2.4.3	[G44.28]	Probable chronic tension-type headache
3.	[G44.0]	Cluster headache and other trigeminal autonomic cephalalgias
3.1	[G44.0]	Cluster headache
3.1.1	[G44.01]	Episodic cluster headache
3.1.2	[G44.02]	Chronic cluster headache
3.2	[G44.03]	Paroxysmal hemicrania
3.2.1	[G44.03]	Episodic paroxysmal hemicrania
3.2.2	[G44.03]	Chronic paroxysmal hemicrania (CPH)
3.3	[G44.08]	Short-lasting Unilateral Neuralgiform headache attacks with Conjunctival injection and Tearing (SUNCT)
3.4	[G44.08]	Probable trigeminal autonomic cephalalgia
3.4.1	[G44.08]	Probable cluster headache
3.4.2	[G44.08]	Probable paroxysmal hemicrania
3.4.3	[G44.08]	Probable SUNCT
4.	[G44.80]	Other primary headaches
4.1	[G44.800]	Primary stabbing headache
4.2	[G44.803]	Primary cough headache
4.3	[G44.804]	Primary exertional headache
4.4	[G44.805]	Primary headache associated with sexual activity
4.4.1	[G44.805]	Preorgasmic headache
4.4.2	[G44.805]	Orgasmic headache
4.5	[G44.80]	Hypnic headache
4.6	[G44.80]	Primary thunderclap headache
4.7	[G44.80]	Hemicrania continua
4.8	[G44.2]	New daily-persistent headache (NDPH)
5.	[G44.88]	Headache attributed to head and/or neck trauma
5.1	[G44.880]	Acute post-traumatic headache
5.1.1	[G44.880]	Acute post-traumatic headache attributed to moderate or severe head injury [S06]
5.1.2	[G44.880]	Acute post-traumatic headache attributed to mild head injury [S09.9]
5.2	[G44.3]	Chronic post-traumatic headache
5.2.1	[G44.30]	Chronic post-traumatic headache attributed to moderate or severe head injury [S06]
5.2.2	[G44.31]	Chronic post-traumatic headache attributed to mild head injury [S09.9]
5.3	[G44.841]	Acute headache attributed to whiplash injury [S13.4]
5.4	[G44.841]	Chronic headache attributed to whiplash injury [S13.4]
5.5	[G44.88]	Headache attributed to traumatic intracranial haematoma
5.5.1	[G44.88]	Headache attributed to epidural haematoma [S06.4]
5.5.2	[G44.88]	Headache attributed to subdural haematoma [S06.5]
5.6	[G44.88]	Headache attributed to other head and/or neck trauma [S06]
5.6.1	[G44.88]	Acute headache attributed to other head and/or neck trauma [S06]
5.6.2	[G44.88]	Chronic headache attributed to other head and/or neck trauma [S06]
5.7	[G44.88]	Post-craniotomy headache
5.7.1	[G44.880]	Acute post-craniotomy headache
5.7.2	[G44.30]	Chronic post-craniotomy headache
6.	[G44.81]	Headache attributed to cranial or cervical vascular disorder
6.1	[G44.810]	Headache attributed to ischaemic stroke or transient ischaemic attack
6.1.1	[G44.810]	Headache attributed to ischaemic stroke (cerebral infarction) [I63]
6.1.2	[G44.810]	Headache attributed to transient ischaemic attack (TIA) [G45]
6.2	[G44.810]	Headache attributed to non-traumatic intracranial haemorrhage [I62]
6.2.1	[G44.810]	Headache attributed to intracerebral haemorrhage [I61]
6.2.2	[G44.810]	Headache attributed to subarachnoid haemorrhage (SAH) [I60]
6.3	[G44.811]	Headache attributed to unruptured vascular malformation [Q28]
6.3.1	[G44.811]	Headache attributed to saccular aneurysm [Q28.3]
6.3.2	[G44.811]	Headache attributed to arteriovenous malformation (AVM) [Q28.2]
6.3.3	[G44.811]	Headache attributed to dural arteriovenous fistula [I67.1]
6.3.4	[G44.811]	Headache attributed to cavernous angioma [D18.0]
6.3.5	[G44.811]	Headache attributed to encephalotrigeminal or leptomeningeal angiomatosis (Sturge Weber syndrome) [Q85.8]
6.4	[G44.812]	Headache attributed to arteritis [M31]
6.4.1	[G44.812]	Headache attributed to giant cell arteritis (GCA) [M31.6]
6.4.2	[G44.812]	Headache attributed to primary central nervous system (CNS) angiitis [I67.7]
6.4.3	[G44.812]	Headache attributed to secondary central nervous system (CNS) angiitis [I68.2]
6.5	[G44.810]	Carotid or vertebral artery pain [I63.0, I63.2, I65.0, I65.2 or I67.0]
6.5.1	[G44.810]	Headache or facial or neck pain attributed to arterial dissection [I67.0]
6.5.2	[G44.814]	Post-endarterectomy headache [I97.8]
6.5.3	[G44.810]	Carotid angioplasty headache
6.5.4	[G44.810]	Headache attributed to intracranial endovascular procedures
6.5.5	[G44.810]	Angiography headache
6.6	[G44.810]	Headache attributed to cerebral venous thrombosis (CVT) [I63.6]
6.7	[G44.81]	Headache attributed to other intracranial vascular disorder
6.7.1	[G44.81]	Cerebral Autosomal Dominant Arteriopathy with Subcortical Infarcts and Leukoencephalopathy (CADASIL) [I67.8]
6.7.2	[G44.81]	Mitochondrial Encephalopathy, Lactic Acidosis and Stroke-like episodes (MELAS) [G31.81]
6.7.3	[G44.81]	Headache attributed to benign angiopathy of the central nervous system [I99]
6.7.4	[G44.81]	Headache attributed to pituitary apoplexy [E23.6]
7.	[G44.82]	Headache attributed to non-vascular intracranial disorder
7.1	[G44.820]	Headache attributed to high cerebrospinal fluid pressure
7.1.1	[G44.820]	Headache attributed to idiopathic intracranial hypertension (IIH) [G93.2]
7.1.2	[G44.820]	Headache attributed to intracranial hypertension secondary to metabolic, toxic or hormonal causes
7.1.3	[G44.820]	Headache attributed to intracranial hypertension secondary to hydrocephalus [G91.8]
7.2	[G44.820]	Headache attributed to low cerebrospinal fluid pressure
7.2.1	[G44.820]	Post-dural puncture headache [G97.0]
7.2.2	[G44.820]	CSF fistula headache [G96.0]
7.2.3	[G44.820]	Headache attributed to spontaneous (or idiopathic) low CSF pressure
7.3	[G44.82]	Headache attributed to non-infectious inflammatory disease
7.3.1	[G44.823]	Headache attributed to neurosarcoidosis [D86.8]
7.3.2	[G44.823]	Headache attributed to aseptic (non-infectious) meningitis [code to specify aetiology]
7.3.3	[G44.823]	Headache attributed to other non-infectious inflammatory disease [code to specify aetiology]
7.3.4	[G44.82]	Headache attributed to lymphocytic hypophysitis [E23.6]
7.4	[G44.822]	Headache attributed to intracranial neoplasm [C00-D48]
7.4.1	[G44.822]	Headache attributed to increased intracranial pressure or hydrocephalus caused by neoplasm [code to specify neoplasm]
7.4.2	[G44.822]	Headache attributed directly to neoplasm [code to specify neoplasm]
7.4.3	[G44.822]	Headache attributed to carcinomatous meningitis [C79.3]
7.4.4	[G44.822]	Headache attributed to hypothalamic or pituitary hyper- or hyposecretion [E23.0]
7.5	[G44.824]	Headache attributed to intrathecal injection [G97.8]
7.6	[G44.82]	Headache attributed to epileptic seizure [G40.x or G41.x to specify seizure type]
7.6.1	[G44.82]	Hemicrania epileptica [G40.x or G41.x to specify seizure type]
7.6.2	[G44.82]	Post-seizure headache [G40.x or G41.x to specify seizure type]
7.7	[G44.82]	Headache attributed to Chiari malformation type I (CM1) [Q07.0]
7.8	[G44.82]	Syndrome of transient Headache and Neurological Deficits with cerebrospinal fluid Lymphocytosis (HaNDL)
7.9	[G44.82]	Headache attributed to other non-vascular intracranial disorder
8.	[G44.4 or G44.83]	Headache attributed to a substance 2 or its withdrawal
8.1	[G44.40]	Headache induced by acute substance use or exposure
8.1.1	[G44.400]	Nitric oxide (NO) donor-induced headache [X44]
8.1.1.1	[G44.400]	Immediate NO donor-induced headache [X44]
8.1.1.2	[G44.400]	Delayed NO donor-headache [X44]
8.1.2	[G44.40]	Phosphodiesterase (PDE) inhibitor-induced headache [X44]
8.1.3	[G44.402]	Carbon monoxide-induced headache [X47]
8.1.4	[G44.83]	Alcohol-induced headache [F10]
8.1.4.1	[G44.83]	Immediate alcohol-induced headache [F10]
8.1.4.2	[G44.83]	Delayed alcohol-induced headache [F10]
8.1.5	[G44.4]	Headache induced by food components and additives
8.1.5.1	[G44.401]	Monosodium glutamate-induced headache [X44]
8.1.6	[G44.83]	Cocaine-induced headache [F14]
8.1.7	[G44.83]	Cannabis-induced headache [F12]
8.1.8	[G44.40]	Histamine-induced headache [X44]
8.1.8.1	[G44.40]	Immediate histamine-induced headache [X44]
8.1.8.2	[G44.40]	Delayed histamine-induced headache [X44]
8.1.9	[G44.40]	Calcitonin gene-related peptide (CGRP)-induced headache [X44]
8.1.9.1	[G44.40]	Immediate CGRP-induced headache [X44]
8.1.9.2	[G44.40]	Delayed CGRP-induced headache [X44]
8.1.10	[G44.41]	Headache as an acute adverse event attributed to medication used for other indications [code to specify substance]
8.1.11	[G44.4 or G44.83]	Headache induced by other acute substance use or exposure [code to specify substance]
8.2	[G44.41 or G44.83]	Medication-overuse headache (MOH)
8.2.1	[G44.411]	Ergotamine-overuse headache [Y52.5]
8.2.2	Triptan-overuse headache
8.2.3	[G44.410]	Analgesic-overuse headache [F55.2]
8.2.4	[G44.83]	Opioid-overuse headache [F11.2]
8.2.5	[G44.410]	Combination medication-overuse headache [F55.2]
8.2.6	[G44.410]	Headache attributed to other medication overuse [code to specify substance]
8.2.7	[G44.41 or G44.83]	Probable medication-overuse headache [code to specify substance]
8.3	[G44.4]	Headache as an adverse event attributed to chronic medication [code to specify substance]
8.3.1	[G44.418]	Exogenous hormone-induced headache [Y42.4]
8.4	[G44.83]	Headache attributed to substance withdrawal
8.4.1	[G44.83]	Caffeine-withdrawal headache [F15.3]
8.4.2	[G44.83]	Opioid-withdrawal headache [F11.3]
8.4.3	[G44.83]	Oestrogen-withdrawal headache [Y42.4]
8.4.4	[G44.83]	Headache attributed to withdrawal from chronic use of other substances [code to specify substance]
9.		Headache attributed to infection
9.1	[G44.821]	Headache attributed to intracranial infection [G00-G09]
9.1.1	[G44.821]	Headache attributed to bacterial meningitis [G00.9]
9.1.2	[G44.821]	Headache attributed to lymphocytic meningitis [G03.9]
9.1.3	[G44.821]	Headache attributed to encephalitis [G04.9]
9.1.4	[G44.821]	Headache attributed to brain abscess [G06.0]
9.1.5	[G44.821]	Headache attributed to subdural empyema [G06.2]
9.2	[G44.881]	Headache attributed to systemic infection [A00-B97]
9.2.1	[G44.881]	Headache attributed to systemic bacterial infection [code to specify aetiology]
9.2.2	[G44.881]	Headache attributed to systemic viral infection [code to specify aetiology]
9.2.3	[G44.881]	Headache attributed to other systemic infection [code to specify aetiology]
9.3	[G44.821]	Headache attributed to HIV/AIDS [B22]
9.4	[G44.821 or G44.881]	Chronic post-infection headache [code to specify aetiology]
9.4.1	[G44.821]	Chronic post-bacterial meningitis headache [G00.9]
10.	[G44.882]	Headache attributed to disorder of homoeostasis
10.1	[G44.882]	Headache attributed to hypoxia and/or hypercapnia
10.1.1	[G44.882]	High-altitude headache [W94]
10.1.2	[G44.882]	Diving headache
10.1.3	[G44.882]	Sleep apnoea headache [G47.3]
10.2	[G44.882]	Dialysis headache [Y84.1]
10.3	[G44.813]	Headache attributed to arterial hypertension [I10]
10.3.1	[G44.813]	Headache attributed to phaeochromocytoma [D35.0 (benign) or C74.1 (malignant)]
10.3.2	[G44.813]	Headache attributed to hypertensive crisis without hypertensive encephalopathy [I10]
10.3.3	[G44.813]	Headache attributed to hypertensive encephalopathy [I67.4]
10.3.4	[G44.813]	Headache attributed to pre-eclampsia [O13-O14]
10.3.5	[G44.813]	Headache attributed to eclampsia [O15]
10.3.6	[G44.813]	Headache attributed to acute pressor response to an exogenous agent [code to specify aetiology]
10.4	[G44.882]	Headache attributed to hypothyroidism [E03.9]
10.5	[G44.882]	Headache attributed to fasting [T73.0]
10.6	[G44.882]	Cardiac cephalalgia [code to specify aetiology]
10.7	[G44.882]	Headache attributed to other disorder of homoeostasis [code to specify aetiology]
11.	[G44.84]	Headache or facial pain attributed to disorder of cranium, neck, eyes, ears, nose, sinuses, teeth, mouth or other facial or cranial structures
11.1	[G44.840]	Headache attributed to disorder of cranial bone [M80-M89.8]
11.2	[G44.841]	Headache attributed to disorder of neck [M99]
11.2.1	[G44.841]	Cervicogenic headache [M99]
11.2.2	[G44.842]	Headache attributed to retropharyngeal tendonitis [M79.8]
11.2.3	[G44.841]	Headache attributed to craniocervical dystonia [G24]
11.3	[G44.843]	Headache attributed to disorder of eyes
11.3.1	[G44.843]	Headache attributed to acute glaucoma [H40]
11.3.2	[G44.843]	Headache attributed to refractive errors [H52]
11.3.3	[G44.843]	Headache attributed to heterophoria or heterotropia (latent or manifest squint) [H50.3-H50.5]
11.3.4	[G44.843]	Headache attributed to ocular inflammatory disorder [code to specify aetiology]
11.4	[G44.844]	Headache attributed to disorder of ears [H60-H95]
11.5	[G44.845]	Headache attributed to rhinosinusitis [J01]
11.6	[G44.846]	Headache attributed to disorder of teeth, jaws or related structures [K00-K14]
11.7	[G44.846]	Headache or facial pain attributed to temporomandibular joint (TMJ) disorder [K07.6]
11.8	[G44.84]	Headache attributed to other disorder of cranium, neck, eyes, ears, nose, sinuses, teeth, mouth or other facial or cervical structures [code to specify aetiology]
12.	[R51]	Headache attributed to psychiatric disorder
12.1	[R51]	Headache attributed to somatisation disorder [F45.0]
12.2	[R51]	Headache attributed to psychotic disorder [code to specify aetiology]
13.	[G44.847, G44.848 or G44.85]	Cranial neuralgias and central causes of facial pain
13.1	[G44.847]	Trigeminal neuralgia
13.1.1	[G44.847]	Classical trigeminal neuralgia [G50.00]
13.1.2	[G44.847]	Symptomatic trigeminal neuralgia [G53.80] + [code to specify aetiology]
13.2	[G44.847]	Glossopharyngeal neuralgia
13.2.1	[G44.847]	Classical glossopharyngeal neuralgia [G52.10]
13.2.2	[G44.847]	Symptomatic glossopharyngeal neuralgia [G53.830] + [code to specify aetiology]
13.3	[G44.847]	Nervus intermedius neuralgia [G51.80]
13.4	[G44.847]	Superior laryngeal neuralgia [G52.20]
13.5	[G44.847]	Nasociliary neuralgia [G52.80]
13.6	[G44.847]	Supraorbital neuralgia [G52.80]
13.7	[G44.847]	Other terminal branch neuralgias [G52.80]
13.8	[G44.847]	Occipital neuralgia [G52.80]
13.9	[G44.851]	Neck-tongue syndrome
13.10	[G44.801]	External compression headache
13.11	[G44.802]	Cold-stimulus headache
13.11.1	[G44.8020]	Headache attributed to external application of a cold stimulus
13.11.2	[G44.8021]	Headache attributed to ingestion or inhalation of a cold stimulus
13.12	[G44.848]	Constant pain caused by compression, irritation or distortion of cranial nerves or upper cervical roots by structural lesions [G53.8] + [code to specify aetiology]
13.13	[G44.848]	Optic neuritis [H46]
13.14	[G44.848]	Ocular diabetic neuropathy [E10-E14]
13.15	[G44.881 or G44.847]	Head or facial pain attributed to herpes zoster
13.15.1	[G44.881]	Head or facial pain attributed to acute herpes zoster [B02.2]
13.15.2	[G44.847]	Post-herpetic neuralgia [B02.2]
13.16	[G44.850]	Tolosa-Hunt syndrome
13.17	[G43.80]	Ophthalmoplegic ‘migraine’
13.18	[G44.810 or G44.847]	Central causes of facial pain
13.18.1	[G44.847]	Anaesthesia dolorosa [G52.800] + [code to specify aetiology]
13.18.2	[G44.810]	Central post-stroke pain [G46.21]
13.18.3	[G44.847]	Facial pain attributed to multiple sclerosis [G35]
13.18.4	[G44.847]	Persistent idiopathic facial pain [G50.1]
13.18.5	[G44.847]	Burning mouth syndrome [code to specify aetiology]
13.19	[G44.847]	Other cranial neuralgia or other centrally mediated facial pain [code to specify aetiology]
14.	[R51]	Other headache, cranial neuralgia, central or primary facial pain
14.1	[R51]	Headache not elsewhere classified
14.2	[R51]	Headache unspecified

1

The additional code specifies the type of seizure.

2

In ICD-10 substances are classified according to the presence or absence of a dependence-producing property. Headaches associated with psychoactive substances (dependence-producing) are classified in G44.83 with an additional code to indicate the nature of the disorder related to the substance use: eg, intoxication (F1x.0), dependence (F1x.2), withdrawal (F1x.3), etc. The 3rd character can be used to indicate the specific substance involved: eg, F10 for alcohol, F15 for caffeine, etc. Abuse of non-dependence-producing substances is classified in F55, with a 4th character to indicate the substance: eg, F55.2 abuse of analgesics. Headaches related to non-dependence-producing substances are classified in G44.4.