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ICD-10-CM 2027 diagnosis code

G43.E09Chronic migraine with aura, not intractable, without status migrainosus

✓ Billable / specific

G43.E09 is a valid, billable ICD-10-CM code for chronic migraine with aura, not intractable, without status migrainosus. It can be reported on claims for dates of service from October 1, 2026 – September 30, 2027.Short description: Chronic migraine with aura, not ntrct, without stat migr

Code last changed in FY2024 (effective October 1, 2023). Source: official FY2027 ICD-10-CM release from CDC/NCHS and CMS. Page updated September 29, 2026. About our data

About G43.E09

G43.E09 is the ICD-10-CM diagnosis code for chronic migraine with aura, not intractable, without status migrainosus. It belongs to category G43 (migraine), block G40-G47 (episodic and paroxysmal disorders) and chapter 6 (diseases of the nervous system). It is billable, so it can be reported on its own for dates of service from October 1, 2026 through September 30, 2027.

Within G43.E0, choose G43.E09 (without status migrainosus) only when documentation doesn't support a more specific option: with status migrainosus (G43.E01).

Use an additional code for adverse effect, if applicable, to identify drug (T36-T50 with fifth or sixth character 5).

It is not a CC or MCC, so as a secondary diagnosis it doesn't change the MS-DRG severity level.

In MS-DRG v44.0, it is part of the grouping logic for DRG 102 (Headaches with MCC, relative weight 1.1201) and DRG 103 (Headaches without MCC, relative weight 0.822), in MDC 01 (Diseases and Disorders of the Nervous System), as a principal or secondary diagnosis. The DRG a claim lands in depends on the principal diagnosis, procedures and any CC/MCC secondary diagnoses.

It was added in FY2024, effective October 1, 2023.

Coding notes

Applicable toConditions and synonyms classified to this code
  • Chronic migraine with aura NOS

Notes that apply from higher levels

Instructions written at a parent level also apply to G43.E09.

› From G43.E Chronic migraine with aura
Excludes1
› From G43 Migraine
Note
  • the following terms are to be considered equivalent to intractable: pharmacoresistant (pharmacologically resistant), treatment resistant, refractory (medically) and poorly controlled
Excludes1
Excludes2
  • headache NOS (R51.9)
  • headache syndromes (G44.-)
Use additional code
  • code for adverse effect, if applicable, to identify drug (T36-T50 with fifth or sixth character 5)

Broader instructions also apply from Chapter 6: Diseases of the nervous system.

Alphabetic index entries

4 entries

Terms in the official ICD-10-CM index that lead to G43.E09.

MS-DRG v44.0 grouping

All DRGs →

Inpatient MS-DRGs this diagnosis can group to, as the principal or a secondary diagnosis, depending on the rest of the claim.

MDC 01 · Diseases and Disorders of the Nervous System

Code history

  1. 2016
  2. 2017
  3. 2018
  4. 2019
  5. 2020
  6. 2021
  7. 2022
  8. 2023
  9. 2024
  10. 2025
  11. 2026
  12. 2027
  • FY2024 (effective 10/1/2023): Added
  • No changes since FY2024.

Common questions about G43.E09

Is G43.E09 billable?

Yes. G43.E09 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).

Can G43.E09 be used as a principal diagnosis?

Yes. The Medicare Code Editor doesn't restrict G43.E09 as a principal diagnosis.

Is G43.E09 a CC or MCC?

No. G43.E09 is neither a CC nor an MCC under MS-DRG v44.0.

What DRG does G43.E09 group to?

G43.E09 is used in the MS-DRG v44.0 logic for MS-DRG 102 (Headaches with MCC) and MS-DRG 103 (Headaches without MCC). Which one applies depends on whether it is the principal diagnosis and on the rest of the claim.