1. G44 Other headache syndromes

    Excludes1

    Excludes2

    • atypical facial pain (G50.1)
    • headache due to lumbar puncture (G97.1)
    • migraines (G43.-)
    • trigeminal neuralgia (G50.0)
    1. G44.0 Cluster headaches and other trigeminal autonomic cephalgias (TAC)

      1. G44.00 Cluster headache syndrome, unspecified

        Inclusion term(s):

        • 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

          Inclusion term(s):

          • Cluster headache syndrome NOS
      2. G44.01 Episodic cluster headache

      3. G44.02 Chronic cluster headache

      4. G44.03 Episodic paroxysmal hemicrania

        Inclusion term(s):

        • Paroxysmal hemicrania NOS
        • G44.031 Episodic paroxysmal hemicrania, intractable
        • G44.039 Episodic paroxysmal hemicrania, not intractable

          Inclusion term(s):

          • Episodic paroxysmal hemicrania NOS
      5. G44.04 Chronic paroxysmal hemicrania

      6. 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

          Inclusion term(s):

          • Short lasting unilateral neuralgiform headache with conjunctival injection and tearing (SUNCT) NOS
      7. G44.09 Other trigeminal autonomic cephalgias (TAC)

        • G44.091 Other trigeminal autonomic cephalgias (TAC), intractable
        • G44.099 Other trigeminal autonomic cephalgias (TAC), not intractable
    2. G44.1 Vascular headache, not elsewhere classified

    3. G44.2 Tension-type headache

      1. G44.20 Tension-type headache, unspecified

      2. G44.21 Episodic tension-type headache

        • G44.211 Episodic tension-type headache, intractable
        • G44.219 Episodic tension-type headache, not intractable

          Inclusion term(s):

          • Episodic tension-type headache NOS
      3. G44.22 Chronic tension-type headache

    4. G44.3 Post-traumatic headache

      1. G44.30 Post-traumatic headache, unspecified

        • G44.301 Post-traumatic headache, unspecified, intractable
        • G44.309 Post-traumatic headache, unspecified, not intractable

          Inclusion term(s):

          • Post-traumatic headache NOS
      2. G44.31 Acute post-traumatic headache

      3. G44.32 Chronic post-traumatic headache

        • G44.321 Chronic post-traumatic headache, intractable
        • G44.329 Chronic post-traumatic headache, not intractable

          Inclusion term(s):

          • Chronic post-traumatic headache NOS
    5. G44.4 Drug-induced headache, not elsewhere classified

      Inclusion term(s):

      • Medication overuse headache
      1. G44.40 Drug-induced headache, not elsewhere classified, not intractable

      2. G44.41 Drug-induced headache, not elsewhere classified, intractable

    6. G44.5 Complicated headache syndromes

      1. G44.51 Hemicrania continua

      2. G44.52 New daily persistent headache (NDPH)

      3. G44.53 Primary thunderclap headache

      4. G44.59 Other complicated headache syndrome

    7. G44.8 Other specified headache syndromes

      1. G44.81 Hypnic headache

      2. G44.82 Headache associated with sexual activity

        Inclusion term(s):

        • Orgasmic headache
        • Preorgasmic headache
      3. G44.83 Primary cough headache

      4. G44.84 Primary exertional headache

      5. G44.85 Primary stabbing headache

      6. G44.89 Other headache syndrome

Abbreviations used here:

NEC Not elsewhere classifiable
This abbreviation in the Tabular List represents “other specified”. When a specific code is not available for a condition, the Tabular List includes an NEC entry under a code to identify the code as the “other specified” code.

NOS Not otherwise specified
This abbreviation is the equivalent of unspecified.