G44.039 ICD-10-CM Code: Episodic paroxysmal hemicrania, not intractable
G44.039 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)
G44.039
Billable / SpecificICD-10-CMOfficial ICD-10-CMCodebook guidanceEpisodic paroxysmal hemicrania, not intractable
A rare headache disorder with episodes of brief, intense stabbing pain on one side of the head accompanied by eye redness and tearing that responds adequately 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
Official- Episodic paroxysmal hemicrania NOS
- Paroxysmal hemicrania NOSInherited from G44.03
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 G44.039. 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 G44.039. Check the code and parent instructions in the Code Book.
Use Additional
OfficialNo Use Additional Code instructions are included in this display for G44.039. Check the code and parent instructions in the Code Book.
Code Also
OfficialNo Code Also instructions are included in this display for G44.039. 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 G44.039 an HCC code?
No. G44.039 is a billable ICD-10-CM code with no mapping under the CMS-HCC V28 or V24 community payment models, and none under the ESRD, Part D RxHCC, or HHS-HCC models.
- Code
- G44.039
- Description
- Episodic paroxysmal hemicrania, not intractable
- HCC (V28)
- No CMS-HCC V28 mapping
- RAF reference coefficient
- —
- Billable
- Yes
- Payment year
- 2026
Coder workflow notes
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This code does not map to an HCC category in any model (V28, V24, ESRD, RxHCC).
What This Code Means
G44.039 is the ICD-10-CM diagnosis code for episodic paroxysmal hemicrania, not intractable. A rare headache disorder with episodes of brief, intense stabbing pain on one side of the head accompanied by eye redness and tearing that responds adequately to treatment. G44.039 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).
G44.039 is a billable ICD-10-CM code, but the current payload does not show a mapping under the CMS-HCC V28 or V24 community payment models, 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.
Confirm the episodic nature of the condition; episodic paroxysmal hemicrania has distinct attack periods.
HCC Buddy maintains structured V28 and V24 mapping, source-labeled coefficient references, and MEAT documentation criteria for G44.039 sourced directly from the CMS-HCC risk adjustment model files and the CMS ICD-10-CM code set.
Coding Tips
- •Confirm the episodic nature of the condition; episodic paroxysmal hemicrania has distinct attack periods
- •Document the treatment response, particularly to indomethacin, which is the typical first-line therapy