2026 ICD-10-CM Diagnosis Code G44.309Post-traumatic headache, unspecified, not intractable
ICD-10-CM Codes›G00–G99›G40-G47›G44
- Billable — Valid for Submission
- Not Chronic
G44.309 is a billable ICD-10-CM diagnosis code for post-traumatic headache, unspecified, not intractable. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026) and groups to MS-DRG 102 through 103. Coders also document this condition as headache due to injury of head and neck. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Headache; including migraine.
Code Identity
Code Classification
Approximate SynonymsGuidance
Alternate terms and clinical phrases that map to this code.
- Headache due to injury of head and neck
- Posttraumatic headache
Tabular List NotesGuidance
Coding notes and annotation back-references applicable to this code.
Inclusion Terms
- Post-traumatic headache NOS
These terms are the conditions for which that code is to be used. The terms may be synonyms of the code title, or, in the case of "other specified" codes, the terms are a list of the various conditions assigned to that code. The inclusion terms are not necessarily exhaustive. Additional terms found only in the Alphabetic Index may also be assigned to a code.
Index to Diseases and InjuriesGuidance
Alphabetical index entries that point to this code.
- post-traumatic - G44.309
- not intractable - G44.309
External Cause of Injuries IndexGuidance
References for this code in the External Cause of Injuries Index.
- Headache
- post-traumatic
- Headache
- post-traumatic
- not intractable
Clinical ClassificationClinical
AHRQ’s CCSR groups this code into broader clinical categories.
Patient EducationClinical
Headache
Almost everyone has had a headache. Headache is the most common form of pain. It's a major reason people miss days at work or school or visit the doctor.
Read the full article at MedlinePlus
Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.
Convert G44.309 to ICD-9-CMHistory
The closest ICD-9-CM equivalents under the General Equivalence Mappings.
Code HistoryHistory
Questions About G44.309Overview
Is G44.309 (Post-traumatic headache, unspecified) a billable code?
Yes. This is a billable ICD-10-CM code, specific enough to report post-traumatic headache, unspecified, not intractable on HIPAA-covered claims from October 1, 2025 through September 30, 2026.
What MS-DRG does G44.309 group to?
When post-traumatic headache, unspecified, not intractable is the principal diagnosis on an inpatient stay, it groups to MS-DRG 102, 103, with relative weights from 0.8363 to 1.1209 depending on complications. Higher weights mean higher Medicare reimbursement.
What is the ICD-9 equivalent of G44.309?
Under the General Equivalence Mappings, post-traumatic headache, unspecified, not intractable converts to ICD-9-CM 339.20 (post-trauma headache NOS). The mapping is approximate, so confirm the match fits the documentation.
Footnotes
[1] Not chronic - A diagnosis code that does not fit the criteria for chronic condition (duration, ongoing medical treatment, and limitations) is considered not chronic. Some codes designated as not chronic are acute conditions. Other diagnosis codes that indicate a possible chronic condition, but for which the duration of the illness is not specified in the code description (i.e., we do not know the condition has lasted 12 months or longer) also are considered not chronic.
