ICD-10-CM 2027
ICD-10 code for intractable tac nec
From the official ICD-10-CM alphabetic index entry “TAC (trigeminal autonomic cephalgia) NEC › intractable”. Page updated September 29, 2026.
About coding intractable tac nec
The ICD-10-CM code for intractable tac nec is G44.091 (Other trigeminal autonomic cephalgias (TAC), intractable).
Within G44.09 (other trigeminal autonomic cephalgias (TAC)), G44.091 is specifically for other trigeminal autonomic cephalgias (TAC), intractable. Related codes cover not intractable (G44.099).
It is not a CC or MCC, so as a secondary diagnosis it doesn't change the MS-DRG severity level.
In MS-DRG v44.0, it is part of the grouping logic for DRG 102 (Headaches with MCC, relative weight 1.1201) and DRG 103 (Headaches without MCC, relative weight 0.822), in MDC 01 (Diseases and Disorders of the Nervous System), as a principal or secondary diagnosis. The DRG a claim lands in depends on the principal diagnosis, procedures and any CC/MCC secondary diagnoses.
Common questions about intractable tac nec ICD-10 codes
What is the ICD-10 code for intractable tac nec?
- G44.091 — Other trigeminal autonomic cephalgias (TAC), intractable.
Is G44.091 billable?
- Yes. G44.091 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can G44.091 be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict G44.091 as a principal diagnosis.
Is G44.091 a CC or MCC?
- No. G44.091 is neither a CC nor an MCC under MS-DRG v44.0.