G44.09 ICD-10-CM Code: Other trigeminal autonomic cephalgias (TAC)
G44.09 is not a CMS-HCC payment code. MEAT criteria · RAF Calculator · free HCC coding tools
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FY 2026 Apr update / Diseases of the nervous system (G00-G99) / Episodic and paroxysmal disorders (G40-G47)
G44.09
Header CodeICD-10-CMOfficial ICD-10-CMCodebook guidanceOther trigeminal autonomic cephalgias (TAC)
CMS-HCC V28
N/A—
Not mapped
CMS-HCC V24
N/A—
Not mapped
ACA/HHS
N/A—
Not mapped
ESRD/PACE
N/A—
Not mapped
RXHCC
N/A—
Not mapped
Code Book Path
Inclusion Terms
OfficialNo inclusion terms are included in this display for G44.09. Check the code and parent instructions in the Code Book.
Excludes 2
Official- certain conditions originating in the perinatal period (P04-P96)Inherited from G00-G99, G44
- certain infectious and parasitic diseases (A00-B99)Inherited from G00-G99, G44
- complications of pregnancy, childbirth and the puerperium (O00-O9A)Inherited from G00-G99, G44
- congenital malformations, deformations, and chromosomal abnormalities (Q00-Q99)Inherited from G00-G99, G44
- endocrine, nutritional and metabolic diseases (E00-E88)Inherited from G00-G99, G44
- injury, poisoning and certain other consequences of external causes (S00-T88)Inherited from G00-G99, G44
- neoplasms (C00-D49)Inherited from G00-G99, G44
- symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R94)Inherited from G00-G99, G44
- atypical facial pain (G50.1)Inherited from G00-G99, G44
- headache due to lumbar puncture (G97.1)Inherited from G00-G99, G44
- migraines (G43.-)Inherited from G00-G99, G44
- trigeminal neuralgia (G50.0)Inherited from G00-G99, G44
Related Codes
Includes
OfficialNo Includes notes are included in this display for G44.09. Check the code and parent instructions in the Code Book.
Excludes 1
Official- headache NOS (R51.9)Inherited from G44
Code First
OfficialNo Code First sequencing instructions are included in this display for G44.09. Check the code and parent instructions in the Code Book.
Use Additional
OfficialNo Use Additional Code instructions are included in this display for G44.09. Check the code and parent instructions in the Code Book.
Code Also
OfficialNo Code Also instructions are included in this display for G44.09. Check the code and parent instructions in the Code Book.
Current with CMS: FY2026 ICD-10-CM Apr 1 update (effective Apr 1 – Sep 30, 2026) · CMS-HCC V28, 100% phased in for payment year 2026. FY2027 code set already staged for October 1, 2026. How HCC Buddy stays current →
- Code
- G44.09
- Description
- Other trigeminal autonomic cephalgias (TAC)
- HCC (V28)
- No CMS-HCC V28 mapping
- RAF reference coefficient
- —
- Billable
- No
- Payment year
- 2026
Coder workflow notes
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What This Code Means
G44.09 is the ICD-10-CM diagnosis code for other trigeminal autonomic cephalgias (tac). G44.09 sits in the ICD-10-CM chapter for diseases of the nervous system (g00-g99), within the section covering episodic and paroxysmal disorders (g40-g47).
Header codes like G44.09 cannot be reported on claims directly; they organize child codes that share clinical context. Coders should select the billable child code that matches the documented presentation and then verify its current source-backed HCC mapping. Do not infer a child code or risk adjustment value from the header alone.
HCC Buddy maintains structured V28 and V24 mapping, source-labeled coefficient references, and MEAT documentation criteria for G44.09 sourced directly from the CMS-HCC risk adjustment model files and the CMS ICD-10-CM code set.