2026 ICD-10-CM Diagnosis Code G44.89Other headache syndrome

ICD-10-CM Codes›G00–G99›G40-G47›G44

ICD-10-CM G44.89
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

G44.89 is a billable ICD-10-CM diagnosis code for other headache syndrome. 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. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Headache; including migraine.

Code Identity

ICD-10-CM Code
G44.89
Billable Status
Yes — Valid for Submission
Code Describes
Other headache syndrome
Short Description
Other headache syndrome
Same as the full description in the CMS dataset.
Parent Code
G44.8
Other specified headache syndromes

Code Classification

ChapterG00–G99Diseases of the nervous system
SectionG40-G47Episodic and paroxysmal disorders
CategoryG44Other headache syndromes
This CodeG44.89Other headache syndrome

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Allergic headache
  • Allergic migraine
  • Anterior ethmoidal nerve syndrome
  • Chronic headache disorder
  • Chronic headache due to and following craniotomy
  • Chronic headache due to disorder
  • Chronic headache due to disorder of temporomandibular joint
  • Chronic headache due to infectious disease
  • Chronic headache due to non-vascular intracranial disorder
  • Chronic primary headache
  • Menopausal headache
  • Nummular headache

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
      • allergic NEC
    • Headache
      • specified syndrome NEC
    • Neuralgia, neuralgic(acute)
      • Sluder's
    • Sluder's neuralgia(syndrome)
    • Syndrome
      • headache NEC
    • Syndrome
      • Sluder's

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

Peripheral Nerve Disorders

Nerves are like wires that carry messages back and forth between your brain and your body. Your peripheral nerves branch off from your brain and spinal cord and connect to all parts of your body, including your muscles and organs.

The full article covers:

  • What are peripheral nerves?
  • What are peripheral nerve disorders?
  • What causes peripheral nerve disorders?
  • What are the symptoms of peripheral nerve disorders?
  • How are peripheral nerve disorders diagnosed?
  • What are the treatments for peripheral nerve disorders?
  • Can peripheral nerve disorders be prevented?

Read the full article at MedlinePlus

Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.

Convert G44.89 to ICD-9-CMHistory

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

ICD-9-CM
339.89 Headache syndrome NEC
Exact Match The mapping is direct, with no qualifiers.

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 G44.89Overview

Is G44.89 (Other specified headache syndromes) a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report other headache syndrome on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

What MS-DRG does G44.89 group to?

When other headache syndrome 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 G44.89?

Under the General Equivalence Mappings, other headache syndrome converts to ICD-9-CM 339.89 (headache syndrome NEC). The mapping is a direct match.

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.