2026 ICD-10-CM Diagnosis Code G44.329Chronic post-traumatic headache, not intractable

ICD-10-CM Codes›G00–G99›G40-G47›G44

ICD-10-CM G44.329
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

G44.329 is a billable ICD-10-CM diagnosis code for chronic post-traumatic headache, 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 chronic headache due to disorder. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Headache; including migraine.

Code Identity

ICD-10-CM Code
G44.329
Billable Status
Yes — Valid for Submission
Code Describes
Chronic post-traumatic headache, not intractable
Short Description
Chronic post-traumatic headache, not intractable
Same as the full description in the CMS dataset.
Parent Code
G44.32
Chronic post-traumatic headache

Code Classification

ChapterG00–G99Diseases of the nervous system
SectionG40-G47Episodic and paroxysmal disorders
CategoryG44Other headache syndromes
This CodeG44.329Chronic post-traumatic headache, not intractable

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Chronic headache due to disorder
  • Chronic pain due to injury
  • Chronic post-concussion headache
  • Chronic post-traumatic headache
  • Late effect of traumatic injury to brain
  • Persistent headache due to and following injury of head
  • Posttraumatic headache

Tabular List NotesGuidance

Coding notes and annotation back-references applicable to this code.

Inclusion Terms

  • Chronic post-traumatic headache NOS

Index to Diseases and InjuriesGuidance

Alphabetical index entries that point to this code.

External Cause of Injuries IndexGuidance

References for this code in the External Cause of Injuries Index.

    • Headache
      • post-traumatic
        • chronic
    • Headache
      • post-traumatic
        • chronic
          • not intractable

Clinical ClassificationClinical

AHRQ’s CCSR groups this code into broader clinical categories.

CCSR NVS010
Headache; including migraine
Default principal diagnosis: inpatient Yes · outpatient Yes

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 G44.329 to ICD-9-CMHistory

The closest ICD-9-CM equivalents under the General Equivalence Mappings.

ICD-9-CM
339.22 Chr post-trauma headache
Approximate The match is approximate rather than exact.

Code HistoryHistory

FY 2016AddedAdded to the ICD-10-CM code setEffective October 1, 2015, the first year of ICD-10-CM.
FY 2017–2025No changes
FY 2026CurrentCurrent code set, no changesEffective October 1, 2025 through September 30, 2026.

Questions About G44.329Overview

Is G44.329 (Chronic post-traumatic headache) a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report chronic post-traumatic headache, not intractable on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

What MS-DRG does G44.329 group to?

When chronic post-traumatic headache, 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 G44.329?

Under the General Equivalence Mappings, chronic post-traumatic headache, not intractable converts to ICD-9-CM 339.22 (chr post-trauma headache). The mapping is approximate, so confirm the match fits the documentation.

Footnotes

[1] Chronic - a chronic condition code indicates a condition lasting 12 months or longer and its effect on the patient based on one or both of the following criteria:

  • The condition results in the need for ongoing intervention with medical products,treatment, services, and special equipment
  • The condition places limitations on self-care, independent living, and social interactions.