G44.099 — Other trigeminal autonomic cephalgias (TAC), not intractable
Is G44.099 billable?
Yes — G44.099 is billable for FY2027. G44.099 is a valid, billable ICD-10-CM code at the highest level of specificity in its branch. G44.099 may be submitted for encounters from October 1, 2026 through September 30, 2027.
G44.099 at a glance
| Code | G44.099 |
|---|---|
| Description | Other trigeminal autonomic cephalgias (TAC), not intractable |
| Billable | Yes |
| Code set | ICD-10-CM FY2027 |
| Valid for encounters | October 1, 2026 – September 30, 2027 |
Which MS-DRGs does G44.099 group to?
G44.099 sits in MDC 01 and helps define the logic of 2 MS-DRGs (version 44, FY2027). Which one a stay actually groups to also depends on procedures and secondary diagnoses.
- 102Headaches with MCCmedical
- 103Headaches without MCCmedical
How is G44.099 listed in the Alphabetic Index?
These are the routes through the Alphabetic Index that lead to G44.099. They show the wording a clinician may have documented, which often differs from the Tabular description.
- Horton's headache or neuralgia
- TACNEC (trigeminal autonomic cephalgia)
- Cephalgia, cephalalgia › trigeminal autonomicNEC
- Horton's headache or neuralgia › not intractable
- Neuralgia, neuralgic › Horton's (acute)
- TACNEC › not intractable (trigeminal autonomic cephalgia)
- Cephalgia, cephalalgia › trigeminal autonomicNEC › not intractable
- Neuralgia, neuralgic › Horton's › not intractable (acute)
Excludes1 — never code together — inherited from G44
The conditions below can never be reported together with G44.099 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 G44.099, but a patient may have both at the same time. When documentation supports it, G44.099 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 G44.099, but a patient may have both at the same time. When documentation supports it, G44.099 and the excluded code may both be reported.
How long has G44.099 existed?
G44.099 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.