G44 | 
		  | 
		Other headache syndromes   | 
	
	
		 |  | 
		
	
		| Excludes1 | 
		headache NOS (R51.9)
  | 
	 
	
		| Excludes2 | 
		atypical facial pain (G50.1) headache due to lumbar puncture (G97.1) migraines (G43.-) trigeminal neuralgia (G50.0)
  | 
	 
 
 | 
	
 |  | 
	
		 G44.0 | 
		 | 
		Cluster headaches and other trigeminal autonomic cephalgias (TAC) | 
	 
 |  | 
	
		 G44.00 | 
		  | 
		Cluster headache syndrome, unspecified | 
	 
	
		 |  | 
		
| Ciliary neuralgia |  | Cluster headache NOS |  | Histamine cephalgia |  | Lower half migraine |  | Migrainous neuralgia |   
 | 
	  |  | 
	
		 G44.001 | 
		 | 
		Cluster headache syndrome, unspecified, intractable | 
	 
  |   |  | 
	
		 G44.009 | 
		  | 
		Cluster headache syndrome, unspecified, not intractable | 
	 
	
		 |  | 
		
| Cluster headache syndrome NOS |   
 | 
	   |    |   |  | 
	
		 G44.01 | 
		 | 
		Episodic cluster headache | 
	 
 |  | 
	
		 G44.011 | 
		 | 
		Episodic cluster headache, intractable | 
	 
  |   |  | 
	
		 G44.019 | 
		  | 
		Episodic cluster headache, not intractable | 
	 
	
		 |  | 
		
| Episodic cluster headache NOS |   
 | 
	   |    |   |  | 
	
		 G44.02 | 
		 | 
		Chronic cluster headache | 
	 
 |  | 
	
		 G44.021 | 
		 | 
		Chronic cluster headache, intractable | 
	 
  |   |  | 
	
		 G44.029 | 
		  | 
		Chronic cluster headache, not intractable | 
	 
	
		 |  | 
		
| Chronic cluster headache NOS |   
 | 
	   |    |   |  | 
	
		 G44.03 | 
		  | 
		Episodic paroxysmal hemicrania | 
	 
	
		 |  | 
		
| Paroxysmal hemicrania NOS |   
 | 
	  |  | 
	
		 G44.031 | 
		 | 
		Episodic paroxysmal hemicrania, intractable | 
	 
  |   |  | 
	
		 G44.039 | 
		  | 
		Episodic paroxysmal hemicrania, not intractable | 
	 
	
		 |  | 
		
| Episodic paroxysmal hemicrania NOS |   
 | 
	   |    |   |  | 
	
		 G44.04 | 
		 | 
		Chronic paroxysmal hemicrania | 
	 
 |  | 
	
		 G44.041 | 
		 | 
		Chronic paroxysmal hemicrania, intractable | 
	 
  |   |  | 
	
		 G44.049 | 
		  | 
		Chronic paroxysmal hemicrania, not intractable | 
	 
	
		 |  | 
		
| Chronic paroxysmal hemicrania NOS |   
 | 
	   |    |   |  | 
	
		 G44.05 | 
		 | 
		Short lasting unilateral neuralgiform headache with conjunctival injection and tearing (SUNCT) | 
	 
 |  | 
	
		 G44.051 | 
		 | 
		Short lasting unilateral neuralgiform headache with conjunctival injection and tearing (SUNCT), intractable | 
	 
  |   |  | 
	
		 G44.059 | 
		  | 
		Short lasting unilateral neuralgiform headache with conjunctival injection and tearing (SUNCT), not intractable | 
	 
	
		 |  | 
		
| Short lasting unilateral neuralgiform headache with conjunctival injection and tearing (SUNCT) NOS |   
 | 
	   |    |   |  | 
	
		 G44.09 | 
		 | 
		Other trigeminal autonomic cephalgias (TAC) | 
	 
 |  | 
	
		 G44.091 | 
		 | 
		Other trigeminal autonomic cephalgias (TAC), intractable | 
	 
  |   |  | 
	
		 G44.099 | 
		 | 
		Other trigeminal autonomic cephalgias (TAC), not intractable | 
	 
  |    |    | 
 |  | 
	
		 G44.1 | 
		  | 
		Vascular headache, not elsewhere classified | 
	 
	
		 |  | 
		
	
		| Excludes2 | 
		cluster headache (G44.0) complicated headache syndromes (G44.5-) drug-induced headache (G44.4-) migraine (G43.-) other specified headache syndromes (G44.8-) post-traumatic headache (G44.3-) tension-type headache (G44.2-)
  | 
	 
 
 | 
	   | 
 |  | 
	
		 G44.2 | 
		 | 
		Tension-type headache | 
	 
 |  | 
	
		 G44.20 | 
		 | 
		Tension-type headache, unspecified | 
	 
 |  | 
	
		 G44.201 | 
		 | 
		Tension-type headache, unspecified, intractable | 
	 
  |   |  | 
	
		 G44.209 | 
		  | 
		Tension-type headache, unspecified, not intractable | 
	 
	
		 |  | 
		
 | 
	   |    |   |  | 
	
		 G44.21 | 
		 | 
		Episodic tension-type headache | 
	 
 |  | 
	
		 G44.211 | 
		 | 
		Episodic tension-type headache, intractable | 
	 
  |   |  | 
	
		 G44.219 | 
		  | 
		Episodic tension-type headache, not intractable | 
	 
	
		 |  | 
		
| Episodic tension-type headache NOS |   
 | 
	   |    |   |  | 
	
		 G44.22 | 
		 | 
		Chronic tension-type headache | 
	 
 |  | 
	
		 G44.221 | 
		 | 
		Chronic tension-type headache, intractable | 
	 
  |   |  | 
	
		 G44.229 | 
		  | 
		Chronic tension-type headache, not intractable | 
	 
	
		 |  | 
		
| Chronic tension-type headache NOS |   
 | 
	   |    |    | 
 |  | 
	
		 G44.3 | 
		 | 
		Post-traumatic headache | 
	 
 |  | 
	
		 G44.30 | 
		 | 
		Post-traumatic headache, unspecified | 
	 
 |  | 
	
		 G44.301 | 
		 | 
		Post-traumatic headache, unspecified, intractable | 
	 
  |   |  | 
	
		 G44.309 | 
		  | 
		Post-traumatic headache, unspecified, not intractable | 
	 
	
		 |  | 
		
| Post-traumatic headache NOS |   
 | 
	   |    |   |  | 
	
		 G44.31 | 
		 | 
		Acute post-traumatic headache | 
	 
 |  | 
	
		 G44.311 | 
		 | 
		Acute post-traumatic headache, intractable | 
	 
  |   |  | 
	
		 G44.319 | 
		  | 
		Acute post-traumatic headache, not intractable | 
	 
	
		 |  | 
		
| Acute post-traumatic headache NOS |   
 | 
	   |    |   |  | 
	
		 G44.32 | 
		 | 
		Chronic post-traumatic headache | 
	 
 |  | 
	
		 G44.321 | 
		 | 
		Chronic post-traumatic headache, intractable | 
	 
  |   |  | 
	
		 G44.329 | 
		  | 
		Chronic post-traumatic headache, not intractable | 
	 
	
		 |  | 
		
| Chronic post-traumatic headache NOS |   
 | 
	   |    |    | 
 |  | 
	
		 G44.4 | 
		  | 
		Drug-induced headache, not elsewhere classified | 
	 
	
		 |  | 
		
| Medication overuse headache |  	
		| UseAdditionalCode | 
		code for adverse effect, if applicable, to identify drug (T36-T50 with fifth or sixth character 5)
  | 
	 
 
 | 
	  |  | 
	
		 G44.40 | 
		 | 
		Drug-induced headache, not elsewhere classified, not intractable | 
	 
  |   |  | 
	
		 G44.41 | 
		 | 
		Drug-induced headache, not elsewhere classified, intractable | 
	 
  |    | 
 |  | 
	
		 G44.5 | 
		 | 
		Complicated headache syndromes | 
	 
 |  | 
	
		 G44.51 | 
		 | 
		Hemicrania continua | 
	 
  |   |  | 
	
		 G44.52 | 
		 | 
		New daily persistent headache (NDPH) | 
	 
  |   |  | 
	
		 G44.53 | 
		 | 
		Primary thunderclap headache | 
	 
  |   |  | 
	
		 G44.59 | 
		 | 
		Other complicated headache syndrome | 
	 
  |    | 
 |  | 
	
		 G44.8 | 
		  | 
		Other specified headache syndromes | 
	 
	
		 |  | 
		
	
		| Excludes2 | 
		headache with orthostatic or positional component, not elsewhere classified (R51.0)
  | 
	 
 
 | 
	  |  | 
	
		 G44.81 | 
		 | 
		Hypnic headache | 
	 
  |   |  | 
	
		 G44.82 | 
		  | 
		Headache associated with sexual activity | 
	 
	
		 |  | 
		
| Orgasmic headache |  | Preorgasmic headache |   
 | 
	   |   |  | 
	
		 G44.83 | 
		 | 
		Primary cough headache | 
	 
  |   |  | 
	
		 G44.84 | 
		 | 
		Primary exertional headache | 
	 
  |   |  | 
	
		 G44.85 | 
		 | 
		Primary stabbing headache | 
	 
  |   |  | 
	
		 G44.86 | 
		  | 
		Cervicogenic headache | 
	 
	
		 |  | 
		
	
		| CodeAlso | 
		associated cervical spinal condition, if known
  | 
	 
 
 | 
	   |   |  | 
	
		 G44.89 | 
		 | 
		Other headache syndrome | 
	 
  |    |