2020 ICD-10-CM Diagnosis Code G44.321

Chronic post-traumatic headache, intractable

    2016 2017 2018 2019 2020 Billable/Specific Code
  • G44.321 is a billable/specific ICD-10-CM code that can be used to indicate a diagnosis for reimbursement purposes.
  • The 2020 edition of ICD-10-CM G44.321 became effective on October 1, 2019.
  • This is the American ICD-10-CM version of G44.321 - other international versions of ICD-10 G44.321 may differ.
The following code(s) above G44.321 contain annotation back-references
Annotation Back-References
In this context, annotation back-references refer to codes that contain:
  • Applicable To annotations, or
  • Code Also annotations, or
  • Code First annotations, or
  • Excludes1 annotations, or
  • Excludes2 annotations, or
  • Includes annotations, or
  • Note annotations, or
  • Use Additional annotations
that may be applicable to G44.321:
  • G00-G99
    2020 ICD-10-CM Range G00-G99

    Diseases of the nervous system

    Type 2 Excludes
    • certain conditions originating in the perinatal period (P04-P96)
    • certain infectious and parasitic diseases (A00-B99)
    • complications of pregnancy, childbirth and the puerperium (O00-O9A)
    • congenital malformations, deformations, and chromosomal abnormalities (Q00-Q99)
    • endocrine, nutritional and metabolic diseases (E00-E88)
    • injury, poisoning and certain other consequences of external causes (S00-T88)
    • neoplasms (C00-D49)
    • symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R94)
    Diseases of the nervous system
  • G44
    ICD-10-CM Diagnosis Code G44

    Other headache syndromes

      2016 2017 2018 2019 2020 Non-Billable/Non-Specific Code
    Type 1 Excludes
    • headache NOS (R51)
    Type 2 Excludes
    • atypical facial pain (G50.1)
    • headache due to lumbar puncture (G97.1)
    • migraines (G43.-)
    • trigeminal neuralgia (G50.0)
    Other headache syndromes
Approximate Synonyms
  • Chronic intractable posttraumatic headache
  • Posttraumatic headache, chronic, intractable
ICD-10-CM G44.321 is grouped within Diagnostic Related Group(s) (MS-DRG v37.0):
  • 102 Headaches with mcc
  • 103 Headaches without mcc

Convert G44.321 to ICD-9-CM

Code History
  • 2016 (effective 10/1/2015): New code (first year of non-draft ICD-10-CM)
  • 2017 (effective 10/1/2016): No change
  • 2018 (effective 10/1/2017): No change
  • 2019 (effective 10/1/2018): No change
  • 2020 (effective 10/1/2019): No change

Diagnosis Index entries containing back-references to G44.321:
  • Headache R51
    ICD-10-CM Diagnosis Code R51

    Headache

      2016 2017 2018 2019 2020 Billable/Specific Code
    Applicable To
    • Facial pain NOS
    Type 1 Excludes
    • atypical face pain (G50.1)
    • migraine and other headache syndromes (G43-G44)
    • trigeminal neuralgia (G50.0)
    • post-traumatic G44.309
      ICD-10-CM Diagnosis Code G44.309

      Post-traumatic headache, unspecified, not intractable

        2016 2017 2018 2019 2020 Billable/Specific Code
      Applicable To
      • Post-traumatic headache NOS
      • chronic G44.329
        ICD-10-CM Diagnosis Code G44.329

        Chronic post-traumatic headache, not intractable

          2016 2017 2018 2019 2020 Billable/Specific Code
        Applicable To
        • Chronic post-traumatic headache NOS
        • intractable G44.321

ICD-10-CM Codes Adjacent To G44.321
G44.221 …… intractable
G44.229 …… not intractable
G44.3 Post-traumatic headache
G44.30 Post-traumatic headache, unspecified
G44.301 …… intractable
G44.309 …… not intractable
G44.31 Acute post-traumatic headache
G44.311 …… intractable
G44.319 …… not intractable
G44.32 Chronic post-traumatic headache
G44.321 …… intractable
G44.329 …… not intractable
G44.4 Drug-induced headache, not elsewhere classified
G44.40 …… not intractable
G44.41 …… 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

Reimbursement claims with a date of service on or after October 1, 2015 require the use of ICD-10-CM codes.