ICD-10-CM 2027 diagnosis code
G43.901Migraine, unspecified, not intractable, with status migrainosus
G43.901 is a valid, billable ICD-10-CM code for migraine, unspecified, not intractable, with status migrainosus. It can be reported on claims for dates of service from October 1, 2026 – September 30, 2027.Short description: Migraine, unsp, not intractable, with status migrainosus
Code unchanged since ICD-10-CM took effect on October 1, 2015. Source: official FY2027 ICD-10-CM release from CDC/NCHS and CMS. Page updated September 29, 2026. About our data
About G43.901
G43.901 is the ICD-10-CM diagnosis code for migraine, unspecified, not intractable, with 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 G43.90 (migraine, unspecified, not intractable), G43.901 is specifically for migraine, unspecified, not intractable, with status migrainosus. Related codes cover without status migrainosus (G43.909).
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 has been part of ICD-10-CM since the code set took effect on October 1, 2015 and hasn't changed since.
Before ICD-10, this condition was coded in ICD-9-CM as 346.92 (migraine, unspecified, without mention of intractable migraine with status migrainosus).
Coding notes
- Status migrainosus NOS
Notes that apply from higher levels
Instructions written at a parent level also apply to G43.901.
› From G43 Migraine
- the following terms are to be considered equivalent to intractable: pharmacoresistant (pharmacologically resistant), treatment resistant, refractory (medically) and poorly controlled
- lower half migraine (G44.00)
Broader instructions also apply from Chapter 6: Diseases of the nervous system.
Alphabetic index entries
2 entriesTerms in the official ICD-10-CM index that lead to G43.901.
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
ICD-9-CM equivalent
Converter →- 346.92Migraine, unspecified, without mention of intractable migraine with status migrainosusexact
From the CMS 2018 General Equivalence Mappings (GEMs), the final GEMs release.
Code history
- 2016
- 2017
- 2018
- 2019
- 2020
- 2021
- 2022
- 2023
- 2024
- 2025
- 2026
- 2027
- FY2016 (effective 10/1/2015): Added (first year of ICD-10-CM)
- No changes since FY2016.
Common questions about G43.901
Is G43.901 billable?
- Yes. G43.901 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can G43.901 be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict G43.901 as a principal diagnosis.
Is G43.901 a CC or MCC?
- No. G43.901 is neither a CC nor an MCC under MS-DRG v44.0.
What DRG does G43.901 group to?
- G43.901 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.
What is the ICD-9 code for G43.901?
- The CMS General Equivalence Mappings map G43.901 to ICD-9-CM 346.92.