2027 ICD-10-CM Diagnosis Code G44.89Other headache syndrome
ICD-10-CM Codes›G00–G99›G40-G47›G44
- Billable — Valid for Submission
- Not Chronic
G44.89 is a billable ICD-10-CM diagnosis code for other headache syndrome. It is valid on HIPAA claims for fiscal year 2027 (October 1, 2026 through September 30, 2027) and groups to MS-DRG 102 through 103. 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.
- 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
Instructional NotesGuidance
Instructions from the official ICD-10-CM Tabular List that apply to G44.89: its own notes plus those printed at G44.8, G44, and Chapter 6. A note printed at a category, block or chapter applies to every code under it.
Excludes1
Not coded here: the excluded code is never reported together with this one, unless the two conditions are unrelated.
Excludes2
Not included here: the excluded condition is not part of this code, but a patient may have both, so both codes may be reported.
- headache with orthostatic or positional component, not elsewhere classified (R51.0)
- certain conditions originating in the perinatal period (P04-P96)
- certain infectious and parasitic diseases (A00-B99)
- complications of pregnancy, childbirth and the puerperium (O00-O9A)
- congenital malformations, deformations, and chromosomal abnormalities (Q00-Q99)
- endocrine, nutritional and metabolic diseases (E00-E88)
- injury, poisoning and certain other consequences of external causes (S00-T88)
- neoplasms (C00-D49)
- symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R94)
Source: CMS ICD-10-CM Tabular List. How to read instructional notes.
Referenced in Other NotesGuidance
Instructional notes printed at other codes that name G44.89, its category, or a range that includes it.
Excludes2 4
These codes carry an Excludes2 note naming G44.89: its condition is not part of those codes, and both may be reported when the patient has both.
- G43 Migraineheadache syndromes (G44.-) names G44.-, which includes this code
- G44.1 Vascular headache, not elsewhere classifiedother specified headache syndromes (G44.8-) names G44.8-, which includes this code
- G89 Pain, not elsewhere classifiedheadache syndromes (G44.-) names G44.-, which includes this code
- R51 Headache
Index to Diseases and InjuriesGuidance
Alphabetical index entries that point to this code.
allergic NEC G44.89
specified syndrome NEC G44.89
Syndrome See Also: Disease;
headache NEC G44.89
Sluder's G44.89
Clinical ClassificationClinical
AHRQ’s CCSR groups this code into broader clinical categories.
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.
Code HistoryHistory
Questions About G44.89Overview
What is the ICD-10 code for other headache syndrome?
The ICD-10-CM code for other headache syndrome is G44.89 (sometimes written as G4489). It is billable on HIPAA-covered claims from October 1, 2026 through September 30, 2027.
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, 2026 through September 30, 2027.
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 0.8219 to 1.1200 depending on complications. Higher weights mean higher Medicare reimbursement.
Can G44.89 be reported with R51.9?
Not as a rule. The Excludes1 note at G44, which applies to G44.89, lists "headache NOS (R51.9)". An Excludes1 note means the excluded code is never reported together with this one; the only exception is when the two conditions are unrelated to each other (Official Guidelines, Section I.A.12.a).
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.
