G44.01 – Episodic cluster headache
ICD-10-CM 2027 diagnosis code · Episodic and paroxysmal disorders
ICD-10-CM code
G44.01
- Code
G44.01(claims format:G4401)- Description
- Episodic cluster headache
- Billable
- No – use a more specific code below
- Valid for
- Dates of service October 1, 2026 – September 30, 2027 (FY2027)
- Chapter
- 6. Diseases of the nervous system (G00-G99)
- Block
- G40-G47 Episodic and paroxysmal disorders
- Parent codes
- G44 › G44.0
Billable codes under G44.01
G44.01 is a header code and cannot be used on claims. Choose the most specific code:
Notes inherited from parent codes
Instructional notes at a category or block level apply to every code below it.
G44 – Other headache syndromes
Excludes1 (not coded here):
- headache NOS (R51.9)
Related codes in G44.0
- G44.00 – Cluster headache syndrome, unspecifiedHeader
- G44.02 – Chronic cluster headacheHeader
- G44.03 – Episodic paroxysmal hemicraniaHeader
- G44.04 – Chronic paroxysmal hemicraniaHeader
- G44.05 – Short lasting unilateral neuralgiform headache with conjunctival injection and tearing (SUNCT)Header
- G44.09 – Other trigeminal autonomic cephalgias (TAC)Header
Frequently asked questions
What is ICD-10 code G44.01?
G44.01 is the ICD-10-CM code for episodic cluster headache, in the block G40-G47 (Episodic and paroxysmal disorders).
Is G44.01 a billable code?
No. G44.01 is a header code with more specific child codes; report one of the billable codes listed above.
What category does G44.01 belong to?
It belongs to category G44 – Other headache syndromes.
Source: CDC/NCHS ICD-10-CM FY2027 code files, tabular list and index. Reference only – code assignment must follow the official ICD-10-CM guidelines and documentation in the medical record.