G44.4 ICD-10-CA code: Drug-induced headache, not elsewhere classified
G44.4 is the ICD-10-CA code for “Drug-induced headache, not elsewhere classified” in CIHI’s FY 2026–2027 release, in effect from Apr 1, 2026.
Official description
G44.4Drug-induced headache, not elsewhere classified
Short description: Drug induced headache NEC
ICD-10-CA · Canada · Also written G444
Index terms
Entries in CIHI’s alphabetical index that lead to G44.4. Searching the index by the condition the note names is how coders reach this code.
- Headache, drug induced NEC
Notes for G44.4
As CIHI prints them, with any note G44.4 takes from the headings above it.
Use additional code
Add a code for this detail when the note documents it.
- Use additional external cause code (Chapter XX) to identify drug.
Excludes
Conditions classified elsewhere.
- Atypical facial pain (G50.1)headache NOS (R51)trigeminal neuralgia (G50.0)From G44 Other headache syndromes
- Certain:• conditions originating in the perinatal period (P00-P96)• infectious and parasitic diseases (A00-B99)complications of pregnancy, childbirth and the puerperium (O00-O99)congenital malformations, deformations and chromosomal abnormalities (Q00-Q99)endocrine, nutritional and metabolic diseases (E00-E90)injury, poisoning and certain other consequences of external causes (S00-T98)neoplasms (C00-D48)symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R99)From Chapter 6: Diseases of the nervous system (G00-G99)
Where G44.4 sits
- 1ChapterChapter 6: Diseases of the nervous system (G00-G99)
- 2Block G40-G47Episodic and paroxysmal disorders
- 3Category G44Other headache syndromes
- 4Valid code G44.4Drug-induced headache, not elsewhere classified
Source and release
- Data release
- ICD-10-CA · FY 2026–2027
- Effective date
- Apr 1, 2026
- Publisher
- CIHI
This page is built from the ICD-10-CA catalog that Vero Codes reads when it suggests codes: Canadian Institute for Health Information’s FY 2026–2027 release, imported from the publisher’s file and checked against it. The description, notes and structured data come from the same record.
Frequently asked questions
What does ICD-10-CA code G44.4 mean?
G44.4 is the ICD-10-CA code for “Drug-induced headache, not elsewhere classified” in CIHI’s ICD-10-CA FY 2026–2027 release.
Where is G44.4 in ICD-10-CA?
G44.4 sits under G44 Other headache syndromes, within G40-G47 Episodic and paroxysmal disorders, within Chapter 6: Diseases of the nervous system (G00-G99).
What coding notes apply to G44.4?
ICD-10-CA lists Use additional code, Excludes notes for G44.4, including those from the headings it sits under. They are listed on this page with where each one comes from.
Which ICD-10-CA release does this page use?
It uses CIHI’s FY 2026–2027 release, in effect from Apr 1, 2026 to Mar 31, 2027. It is a reference: confirm the code against the current list and the payer’s rules before you submit it.