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G43.10 vs G44

G43.10 (Migraine with aura, not intractable) compared with G44 (Other headache syndromes), from the official CMS tabular data.

Current data releases:ICD-10-CM FY2027 · ICD-10-PCS FY2027 · HCPCS October 2026 · MS-DRG v44 · Medicare Code Editor v44.0 · NCCI PTP Q4 2026 · MUE Q4 2026 · NCD code lists 2026-01 · LCD export September 28, 2026 · All releases and sources

Summary

These codes can be reported together when both conditions are documented, because G43.10 lists G44 under Excludes2, which marks them as distinct conditions.

Official rule
What is different?

The conditions named.G43.10 is “Migraine with aura, not intractable”; G44 is “Other headache syndromes”.

Registry fact

Can these codes be reported together?

Yes, when both are documented.G43.10 lists G44 under Excludes2: “headache syndromes (G44.-)”. Excludes2 marks distinct conditions that may both be reported when both are documented.

Official ruleGuide: Excludes1 vs Excludes2

Is there an Excludes1 relationship?

None.Neither entry carries an Excludes1 note that names the other code. G43.10 carries 3 Excludes1 notes and G44 carries 1 Excludes1 note covering other codes; the side-by-side table quotes them.

Official rule

Is there an Excludes2 relationship?

Yes.G43.10’s tabular entry: “headache syndromes (G44.-)”. The note covers G44.

Official ruleGuide: Excludes1 vs Excludes2

Is one more specific?

Not comparable.The codes sit in different categories; specificity is only comparable within one category.

Is one a parent or header code?

Both are headers.Both are non-billable headers, and neither contains the other.

Registry fact

Are there sequencing instructions?

None.Neither entry carries a Code First or Use Additional Code note that names the other.

Official rule

Are there other coding relationships?

None found.No laterality, encounter-phase, Table of Neoplasms, Table of Drugs and Chemicals, or history-versus-active-disease relationship links these codes.

MedCoder-derived

Official rule: a tabular instructional note or a section of the ICD-10-CM Official Guidelines, quoted as published. Registry fact: the codes’ own published attributes (titles, billable status, position in the hierarchy, code set). MedCoder-derived: a reading MedCoder computes from those facts; it is not itself a rule. How to read the labels

Can these codes be reported together?

Informational

Excludes2 relationship

G43.10
Migraine with aura, not intractable
↔
G44
Other headache syndromes

What we found

Yes, when both are documented.G43.10 carries an Excludes2 note covering G44: “headache syndromes (G44.-)”

Excludes2 marks distinct conditions — both may be reported when both are documented.

What to review

Report both only when the documentation supports both conditions; otherwise report the one documented.

Guide: Excludes1 vs Excludes2Check these on a claim

Why it matters

An Excludes2 note means the excluded condition is not part of the code above it, but a patient can have both. Report both when both are documented.

Source / rule

CMS ICD-10-CM tabular instructional notes

Official guidance behind these answers

  • Section I.A.12.b — Excludes2 · applies to: Excludes2

    A type 2 Excludes note represents “Not included here.” An excludes2 note indicates that the condition excluded is not part of the condition represented by the code, but a patient may have both conditions at the same time. When an Excludes2 note appears under a code, it is acceptable to use both the code and the excluded code together, when appropriate.

    ICD-10-CM Official Guidelines FY2027

Quoted from the ICD-10-CM Official Guidelines for Coding and Reporting in effect for the release shown. The tabular notes above are the code-level instruction; these sections are the convention that says how such a note is applied. Source document (CMS PDF) · Release and checksum

Side by side

Similar descriptions do not make codes interchangeable. The documentation and the official instructions decide which code applies.

Official descriptionDiffers
G43.10

Migraine with aura, not intractable

G44

Other headache syndromes

StatusDiffers
G43.10
Non-billable header

A header is not reported on a claim; a code beneath it is.

Report instead: G43.101, G43.109

G44
Non-billable header

A header is not reported on a claim; a code beneath it is.

Report instead: G44.001, G44.009, G44.011, G44.019, G44.021

Excludes1Differs
G43.10
  • chronic migraine with aura (G43.E-)
  • persistent migraine aura (G43.5-, G43.6-)
  • lower half migraine (G44.00)
G44
  • headache NOS (R51.9)
Excludes2Differs
G43.10
  • headache NOS (R51.9)
  • headache syndromes (G44.-)
G44
  • atypical facial pain (G50.1)
  • headache due to lumbar puncture (G97.1)
  • migraines (G43.-)
  • trigeminal neuralgia (G50.0)
Use additional codeDiffers
G43.10
  • code for adverse effect, if applicable, to identify drug (T36-T50 with fifth or sixth character 5)
G44

None at this code

Code alsoDiffers
G43.10
  • any associated seizure (G40.-, R56.9)
G44

None at this code

CategoryDiffers
G43.10

G43 Migraine

G44

Is itself a category

ChapterSame for both

G00-G99 — Diseases of the Nervous System (G00-G99)

IncludesDiffers
G43.10
  • Migraine with aura without mention of refractory migraine
G44

None at this code

No Code first and 7th character note at either code.

Notes are the code’s own tabular entry, quoted as published. A note that names the other code is the one the verdict above rests on. In a row that differs, notes every code shares are dimmed.

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Derived from the official CMS ICD-10-CM tabular data (FY2027). A coding-rule comparison, not billing advice: payer-specific edits and medical-necessity policy are outside its scope. All data sources