G44.091 ICD-10-CM Code: Other trigeminal autonomic cephalgias (TAC), intractable
G44.091 is not a CMS-HCC payment code. MEAT criteria · RAF Calculator · HCC Buddy coding tools
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FY 2026 Apr update / Diseases of the nervous system (G00-G99) / Episodic and paroxysmal disorders (G40-G47)
G44.091
Billable / SpecificICD-10-CMOfficial ICD-10-CMCodebook guidanceOther trigeminal autonomic cephalgias (TAC), intractable
Other rare headache conditions involving the trigeminal nerve with autonomic symptoms (such as eye redness, tearing, or nasal congestion) that do not respond well to treatment.
CMS-HCC V28
N/A—
Not mapped
CMS-HCC V24
HistoricalHistorical
Not used for CY2026 payment
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 G44.091. 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 G44.091. 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 G44.091. Check the code and parent instructions in the Code Book.
Use Additional
OfficialNo Use Additional Code instructions are included in this display for G44.091. Check the code and parent instructions in the Code Book.
Code Also
OfficialNo Code Also instructions are included in this display for G44.091. Check the code and parent instructions in the Code Book.
Buddy Documentation Tip
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 →
Is G44.091 an HCC code?
No. G44.091 is a billable ICD-10-CM code with no mapping under the current CMS-HCC V28 community payment model, and none under the ESRD, Part D RxHCC, or HHS-HCC models.
- Code
- G44.091
- Description
- Other trigeminal autonomic cephalgias (TAC), intractable
- HCC (V28)
- No CMS-HCC V28 mapping
- RAF reference coefficient
- —
- Billable
- Yes
- Payment year
- 2026
Coder workflow notes
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What This Code Means
G44.091 is the ICD-10-CM diagnosis code for other trigeminal autonomic cephalgias (tac), intractable. Other rare headache conditions involving the trigeminal nerve with autonomic symptoms (such as eye redness, tearing, or nasal congestion) that do not respond well to treatment. G44.091 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).
G44.091 is a billable ICD-10-CM code, but no current CMS-HCC V28 community payment mapping is shown, and none under the ESRD, Part D RxHCC, or HHS-HCC models. Do not assign risk adjustment value from this page when no source-backed mapping is shown; verify the applicable model and payment year.
This is a catch-all code for trigeminal autonomic cephalgia variants not specifically classified; ensure the condition truly fits TAC criteria.
HCC Buddy maintains structured V28 and V24 mapping, source-labeled coefficient references, and MEAT documentation criteria for G44.091 sourced directly from the CMS-HCC risk adjustment model files and the CMS ICD-10-CM code set.
Coding Tips
- •This is a catch-all code for trigeminal autonomic cephalgia variants not specifically classified; ensure the condition truly fits TAC criteria
- •Document the specific autonomic symptoms present and the intractable treatment status clearly