G43.C1 – Periodic headache syndromes in child or adult, intractable

ICD-10-CM 2027 diagnosis code · Episodic and paroxysmal disorders

Billable code

ICD-10-CM code G43.C1

Code: G43.C1 (claims format: G43C1)
Description: Periodic headache syndromes in child or adult, intractable
Billable: Yes – valid for HIPAA-covered transactions
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: G43 › G43.C

Notes for G43.C1

Applicable to:

Periodic headache syndromes in child or adult, with refractory migraine

Notes inherited from parent codes

Instructional notes at a category or block level apply to every code below it.

G43 – Migraine

Excludes1 (not coded here):

lower half migraine (G44.00)

Excludes2 (not included here):

headache NOS (R51.9)
headache syndromes (G44.-)

Use additional code:

code for adverse effect, if applicable, to identify drug (T36-T50 with fifth or sixth character 5)

Notes:

the following terms are to be considered equivalent to intractable: pharmacoresistant (pharmacologically resistant), treatment resistant, refractory (medically) and poorly controlled

Index terms for G43.C1

Entries in the ICD-10-CM alphabetic index that lead to this code:

Related codes in G43.C

G43.C0 – Periodic headache syndromes in child or adult, not intractableBillable

Frequently asked questions

What is ICD-10 code G43.C1?

G43.C1 is the ICD-10-CM code for periodic headache syndromes in child or adult, intractable, in the block G40-G47 (Episodic and paroxysmal disorders).

Is G43.C1 a billable code?

Yes. G43.C1 is a billable/specific code that can be used to indicate a diagnosis for reimbursement purposes.

What category does G43.C1 belong to?

It belongs to category G43 – Migraine.

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.