G44.0 — Cluster headaches and other trigeminal autonomic cephalgias (TAC)
Is G44.0 billable?
No — G44.0 is a non-billable header code. G44.0 groups more specific codes and cannot be submitted on a claim. A valid ICD-10-CM code must be reported at the highest level of specificity available in its branch. Select one of the 14 billable codes beneath G44.0.
Billable codes under this header
- G44.001Cluster headache syndrome, unspecified, intractable
- G44.009Cluster headache syndrome, unspecified, not intractable
- G44.011Episodic cluster headache, intractable
- G44.019Episodic cluster headache, not intractable
- G44.021Chronic cluster headache, intractable
- G44.029Chronic cluster headache, not intractable
- G44.031Episodic paroxysmal hemicrania, intractable
- G44.039Episodic paroxysmal hemicrania, not intractable
- G44.041Chronic paroxysmal hemicrania, intractable
- G44.049Chronic paroxysmal hemicrania, not intractable
- G44.051Short lasting unilateral neuralgiform headache with conjunctival injection and tearing (SUNCT), intractable
- G44.059Short lasting unilateral neuralgiform headache with conjunctival injection and tearing (SUNCT), not intractable
- G44.091Other trigeminal autonomic cephalgias (TAC), intractable
- G44.099Other trigeminal autonomic cephalgias (TAC), not intractable
G44.0 at a glance
| Code | G44.0 |
|---|---|
| Description | Cluster headaches and other trigeminal autonomic cephalgias (TAC) |
| Billable | No — header code |
| Code set | ICD-10-CM FY2027 |
| Valid for encounters | October 1, 2026 – September 30, 2027 |
Excludes1 — never code together — inherited from G44
The conditions below can never be reported together with G44.0 on the same claim. An Excludes1 note means the two conditions cannot occur in the same patient, so reporting both is a coding error.
- headache NOS (R51.9)
Excludes2 — not included here — inherited from Chapter 6
The conditions below are not part of G44.0, but a patient may have both at the same time. When documentation supports it, G44.0 and the excluded code may both be reported.
- 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)
Excludes2 — not included here — inherited from G44
The conditions below are not part of G44.0, but a patient may have both at the same time. When documentation supports it, G44.0 and the excluded code may both be reported.
What codes fall under G44.0? (7)
- G44.00Cluster headache syndrome, unspecifiednot billable
- G44.01Episodic cluster headachenot billable
- G44.02Chronic cluster headachenot billable
- G44.03Episodic paroxysmal hemicranianot billable
- G44.04Chronic paroxysmal hemicranianot billable
- G44.05Short lasting unilateral neuralgiform headache with conjunctival injection and tearing (SUNCT)not billable
- G44.09Other trigeminal autonomic cephalgias (TAC)not billable
How long has G44.0 existed?
G44.0 has been in ICD-10-CM since at least FY2016, the earliest fiscal year on record here.
Derived from the official order files for FY2016–FY2026. FY2017 and FY2020 publish no order file, so those years are not covered.