R51.9
BillableHeadache, unspecified
Headache, unspecified
Coding Notes
Inclusion Terms
Alternative clinical terms for this condition
- Facial pain NOS
Excludes 2
Conditions not included here, but the patient may have both
- •abnormal findings on antenatal screening of motherO28
- •certain conditions originating in the perinatal periodP04-P96
- signs and symptoms classified in the body system chapters
- •signs and symptoms of breast,N63, N64.5
- •atypical face painG50.1
- •migraine and other headache syndromesG43-G44
- •trigeminal neuralgiaG50.0
Related Codes(1)
Also Known As / Clinical Terms(345)
SNOMED CT
- Occipital headache330007
- Sinus headache4969004
- Referred pain6617009
- Postseizure headache13322008
- Cephalalgia25064002
- Cephalgia25064002
- Cephalodynia25064002
- HA - Headache25064002
- Head pain25064002
- Headache25064002
- Pain in head25064002
- Pulsatile pain29695002
- Throbbing pain29695002
- Post-fit state31758001
- Post-ictal state31758001
- Post-seizure state31758001
- Postictal state31758001
- Aural headache38823002
- Temporal headache41413006
- Nasal headache44538002
- Shooting pain49575005
- Scalp tenderness75851004
- Tenderness of scalp75851004
- Alpine sickness87284002
- Altitude sickness87284002
- Effects of high altitude87284002
- Hypobaropathy87284002
- Illnesses due to high altitude effects87284002
- Mountain sickness87284002
- Hindbrain hernia headache95659007
- Face ache95668009
- Face pain95668009
- Facial pain95668009
- Pain in face95668009
- Pain of face95668009
- External compression headache103007003
- Headache due to external compression of head103007003
- Postpartum headache103008008
- Cold stimulus headache103009000
- Headache due to cold exposure103009000
- Dental headache112101004
- Headache due to intracranial disease129610005
- Viral headache162211001
- Generalised headache162299003
- Generalized headache162299003
- One sided headache162300006
- Unilateral headache162300006
- Bilateral headache162301005
- Parietal headache162304002
- Aching headache162307009
- Throbbing headache162308004
- Shooting headache162309007
- Morning headache162310002
- Heavy head162311003
- Obstetric spinal and epidural anaesthesia-induced headache200071001
- Obstetric spinal and epidural anesthesia-induced headache200071001
- Headache disorder230461009
- Low pressure headache230478000
- PDPH - Post dural puncture headache230479008
- Post dural puncture headache230479008
- Post-dural puncture headache230479008
- Headache following myelography230480006
- Postmyelography headache230480006
- Frontal headache267096005
- Tenderness over maxillary sinus277238004
- Tenderness over frontal sinus277241008
- Facial tenderness278995006
- Tenderness of face278995006
- Maxillary sinus pain301356002
- Frontal sinus pain301357006
- Pain of head and neck region301365009
- Tenderness of respiratory structure301389002
- Tenderness of head and neck region301401001
- Tenderness of neck309522006
- Finding of headache character364760007
- Headache character - finding364760007
- Muscle contraction headache398126006
- Muscular headache398126006
- Headache caused by high altitude425422007
- Pain radiating to head425839000
- Chronic facial pain432615008
- Chronic pain in face432615008
- Referred pain in face449313005
- Buccal region pain473008002
- Pain in cheek473008002
- Pain in chin473434003
- Craniofacial pain699046000
- Headache attributed to reversible cerebral vasoconstriction syndrome703182002
- Headache due to reversible cerebral vasoconstriction syndrome703182002
- Intermittent headache712826000
- Frequent headache712831003
- Acute facial pain735937001
- Acute pain in face735937001
- Acute headache735938006
- Chronic orofacial pain762454002
- Chronic primary orofacial pain762593008
- Chronic secondary facial pain762604001
- E621 intolerance782338006
- Intolerance to monosodium glutamate782338006
- MSG (monosodium glutamate) intolerance782338006
- Monosodium glutamate intolerance782338006
- Sodium hydrogen L-glutamate intolerance782338006
- Unilateral headache on left side of head1119294003
- Unilateral left sided headache1119294003
- Unilateral headache on right side of head1119295002
- Unilateral right sided headache1119295002
- Carbon monoxide-induced headache1259052007
- Headache caused by carbon monoxide1259052007
- Delayed alcohol-induced headache1259867005
- Delayed headache caused by alcohol1259867005
- Headache due to intracranial neoplasm1260321008
- Headache due to non-traumatic subarachnoid haemorrhage1260323006
- Headache due to non-traumatic subarachnoid hemorrhage1260323006
- Headache due to spontaneous subarachnoid haemorrhage1260323006
- Headache due to spontaneous subarachnoid hemorrhage1260323006
- Headache due to arterial hypertension1260345007
- Headache due to hypertension1260345007
- Headache due to acute angle closure glaucoma1260348009
- Headache caused by monosodium glutamate1263586000
- Monosodium glutamate-induced headache1263586000
- Chronic daily headache458241000124102
- Chronic orofacial pain due to disorder39151000087103
- Chronic secondary orofacial pain39151000087103
- Chronic orofacial pain due to infectious disease44511000087105
- Chronic orofacial pain due to nonvascular intracranial disorder39651000087108
- Chronic secondary orofacial pain due to nonvascular intracranial disorder39651000087108
- Chronic orofacial pain due to temporomandibular joint disorder39721000087109
- Daily headache571000119103
- Neoplasm related pain98921000119102
- Pain due to neoplastic disease98921000119102
- Pain related to neoplasm98921000119102
UMLS
- CephalalgiaC0018681
- CephalalgiasC0018681
- CephalgiaC0018681
- CephalgiasC0018681
- CephalodyniaC0018681
- CephalodyniasC0018681
- Cranial PainC0018681
- Cranial PainsC0018681
- HA - HeadacheC0018681
- Head PainC0018681
- Head PainsC0018681
- Head painC0018681
- HeadacheC0018681
- Headache (finding)C0018681
- Headache NOSC0018681
- Headache, unspecifiedC0018681
- HeadachesC0018681
- Pain headC0018681
- Pain in headC0018681
- Pain, CranialC0018681
- Pain, HeadC0018681
- Pains, CranialC0018681
- Pains, HeadC0018681
- ache headC0018681
- cephalalgiaC0018681
- cephalgiaC0018681
- cephalgiasC0018681
- cephalodyniaC0018681
- cranial painC0018681
- head acheC0018681
- head painC0018681
- head painedC0018681
- head painsC0018681
- headacheC0018681
- headachesC0018681
- pain in headC0018681
- Eyebrow painC0015468
- Face PainC0015468
- Face acheC0015468
- Face painC0015468
- Facial PainC0015468
- Facial painC0015468
- Facial pain NOSC0015468
- Pain in faceC0015468
- Pain in face (finding)C0015468
- Pain of faceC0015468
- Pain, FaceC0015468
- Pain, FacialC0015468
- ache faceC0015468
- face acheC0015468
- face painC0015468
- faces painC0015468
- facial painC0015468
- of face painC0015468
- pain faceC0015468
- pain facialC0015468
- pain in faceC0015468
Clinical Terms
- Pain, Face
- Frequent headache
- cephalgia
- Morning headache
- head pained
- Cold stimulus headache
- face pain
- Heavy head
- Generalized headache
- Referred pain in face
- pain in face
- Neoplasm related pain
- Chronic secondary orofacial pain
- Unilateral left sided headache
- pain face
- Post dural puncture headache
- Temporal headache
- Headache following myelography
- Unilateral headache on right side of head
- Carbon monoxide-induced headache
- Pain in face (finding)
- Cranial Pains
- Referred pain
- Maxillary sinus pain
- cephalalgia
- Headache due to spontaneous subarachnoid haemorrhage
- cranial pain
- Occipital headache
- head pain
- Chronic orofacial pain due to nonvascular intracranial disorder
- pain facial
- Post-fit state
- Cephalodynias
- Obstetric spinal and epidural anesthesia-induced headache
- Pulsatile pain
- Facial tenderness
- Pain, Facial
- Pain, Head
- Craniofacial pain
- Muscle contraction headache
- Tenderness over maxillary sinus
- Headaches
- Facial Pain
- Shooting pain
- Headache due to acute angle closure glaucoma
- Chronic facial pain
- Chronic orofacial pain due to temporomandibular joint disorder
- Bilateral headache
- Chronic secondary facial pain
- Monosodium glutamate intolerance
- ache head
- Alpine sickness
- Headache due to cold exposure
- Headache due to hypertension
- Unilateral right sided headache
- faces pain
- Headache (finding)
- Parietal headache
- Intolerance to monosodium glutamate
- cephalodynia
- Chronic orofacial pain due to infectious disease
- Face ache
- Headache caused by high altitude
- Post-dural puncture headache
- Obstetric spinal and epidural anaesthesia-induced headache
- Nasal headache
- Pain in chin
- Mountain sickness
- ache face
- Headache NOS
- Pain, Cranial
- Shooting headache
- Unilateral headache
- Pain radiating to head
- Throbbing pain
- Tenderness of neck
- Frontal headache
- Pains, Cranial
- Muscular headache
- pain in head
- Post-ictal state
- Unilateral headache on left side of head
- Headache due to intracranial neoplasm
- Pain related to neoplasm
- Tenderness of head and neck region
- Buccal region pain
- Effects of high altitude
- PDPH - Post dural puncture headache
- Cephalalgias
- Tenderness of respiratory structure
- Intermittent headache
- Finding of headache character
- Headache due to intracranial disease
- MSG (monosodium glutamate) intolerance
- cephalgias
- Aural headache
- External compression headache
- of face pain
- Hindbrain hernia headache
- Headache attributed to reversible cerebral vasoconstriction syndrome
- Headache due to external compression of head
- Chronic pain in face
- Delayed headache caused by alcohol
- HA - Headache
- Headache due to reversible cerebral vasoconstriction syndrome
- Postmyelography headache
- Throbbing headache
- E621 intolerance
- Eyebrow pain
- Headache due to spontaneous subarachnoid hemorrhage
- Acute facial pain
- Acute pain in face
- Pain of head and neck region
- head ache
- Chronic primary orofacial pain
- Generalised headache
- Headache disorder
- Chronic secondary orofacial pain due to nonvascular intracranial disorder
- Postpartum headache
- Sodium hydrogen L-glutamate intolerance
- Post-seizure state
- Viral headache
- Acute headache
- Headache caused by carbon monoxide
- Pain due to neoplastic disease
- head pains
- Aching headache
- Headache due to arterial hypertension
- Low pressure headache
- Dental headache
- Pain in cheek
- Tenderness of face
- Altitude sickness
- Postictal state
- Postseizure headache
- Headache due to non-traumatic subarachnoid haemorrhage
- Headache character - finding
- Headache due to non-traumatic subarachnoid hemorrhage
- Pain head
- Pain of face
- Sinus headache
- Frontal sinus pain
- One sided headache
- Hypobaropathy
- Chronic orofacial pain due to disorder
- Monosodium glutamate-induced headache
- Delayed alcohol-induced headache
- Scalp tenderness
- Headache caused by monosodium glutamate
- Chronic daily headache
- Tenderness of scalp
- Tenderness over frontal sinus
- Pains, Head
- Illnesses due to high altitude effects
- Facial pain NOS
- Daily headache
- Chronic orofacial pain
Frequently Asked Questions
What is the ICD-10 code for headache, unspecified?
The ICD-10-CM code for headache, unspecified is R51.9. The full clinical description is "Headache, unspecified". R51.9 is a billable/specific code that can be used on insurance claims and medical billing.
What does ICD-10 code R51.9 mean?
ICD-10-CM code R51.9 represents “Headache, unspecified”. It is classified under Chapter 18: Symptoms, Signs and Abnormal Clinical and Laboratory Findings and is a billable/specific code that can be used on a claim.
Is R51.9 a billable code?
Yes, R51.9 is a billable/specific ICD-10-CM code and can be used to indicate a diagnosis on a medical claim.
What chapter is R51.9 in?
R51.9 is in Chapter 18: Symptoms, Signs and Abnormal Clinical and Laboratory Findings (codes R00-R99).
What SNOMED CT codes does R51.9 map to?
R51.9 maps to 79 SNOMED CT concepts: 162307009, 735937001, 735938006, 87284002, 38823002, and 74 more. SNOMED CT is a clinical terminology used in electronic health records.
What are the UMLS CUIs for R51.9?
R51.9 is linked to 2 UMLS Concept Unique Identifiers: C0018681, C0015468. The UMLS (Unified Medical Language System) integrates multiple biomedical vocabularies maintained by the U.S. National Library of Medicine.
How does R51.9 relate to ICF functioning codes?
ICF (International Classification of Functioning, Disability and Health) codes describe how conditions like headache, unspecified affect a person's functioning — body functions, activities, participation, and environmental factors. AutoICD provides ICF Core Sets for 12+ conditions and can map clinical text to ICF categories automatically. Browse the ICF directory to explore functioning codes.
What is the ICD-11 equivalent of R51.9?
There is no direct ICD-11 mapping available for R51.9 in the WHO crosswalk tables. This may mean the concept is classified differently in ICD-11. Use the ICD-10 to ICD-11 converter to search for related codes.
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Includes SNOMED Clinical Terms® (SNOMED CT®) used by permission of SNOMED International. Includes content from the UMLS Metathesaurus, courtesy of the U.S. National Library of Medicine.