FY2027 ICD-10-CM reference
G43.821: Menstrual migraine, not intractable, with status migrainosus
By the HCC Buddy Coding Team
The official ICD-10-CM descriptor is Menstrual migraine, not intractable, with status migrainosus. The FY2027 annual edition starts October 1, 2026. Check the edition that applies to the encounter or inpatient discharge, including any April update.
Billable code. Verified against the official FY2027 order file.
FY2027 Tabular instructions
Instructions below include applicable chapter, section and parent-code notes. Each note identifies where it appears in the official source.
Excludes2
certain conditions originating in the perinatal period (P04-P96)
Source: G00-G99 (chapter, inherited).
Excludes2
certain infectious and parasitic diseases (A00-B99)
Source: G00-G99 (chapter, inherited).
Excludes2
complications of pregnancy, childbirth and the puerperium (O00-O9A)
Source: G00-G99 (chapter, inherited).
Excludes2
congenital malformations, deformations, and chromosomal abnormalities (Q00-Q99)
Source: G00-G99 (chapter, inherited).
Excludes2
endocrine, nutritional and metabolic diseases (E00-E88)
Source: G00-G99 (chapter, inherited).
Excludes2
injury, poisoning and certain other consequences of external causes (S00-T88)
Source: G00-G99 (chapter, inherited).
Excludes2
neoplasms (C00-D49)
Source: G00-G99 (chapter, inherited).
Excludes2
symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R94)
Source: G00-G99 (chapter, inherited).
Instructional note
the following terms are to be considered equivalent to intractable: pharmacoresistant (pharmacologically resistant), treatment resistant, refractory (medically) and poorly controlled
Source: G43 (category, inherited).
Instructional note
code for adverse effect, if applicable, to identify drug (T36-T50 with fifth or sixth character 5)
Source: G43 (category, inherited).
Excludes1
lower half migraine (G44.00)
Source: G43 (category, inherited).
Excludes2
headache NOS (R51.9)
Source: G43 (category, inherited).
Excludes2
headache syndromes (G44.-)
Source: G43 (category, inherited).
Instructional note
Menstrual headache, not intractable
Source: G43.82 (self, inherited).
Instructional note
Menstrual migraine, without refractory migraine
Source: G43.82 (self, inherited).
Instructional note
Menstrually related migraine, not intractable
Source: G43.82 (self, inherited).
Instructional note
Pre-menstrual headache, not intractable
Source: G43.82 (self, inherited).
Instructional note
Pre-menstrual migraine, not intractable
Source: G43.82 (self, inherited).
Instructional note
Pure menstrual migraine, not intractable
Source: G43.82 (self, inherited).
Code also
associated premenstrual tension syndrome (N94.3)
Source: G43.82 (self, inherited).
Compare the FY2027 additions, removals and billable-status changes
What does G43.821 mean in FY2027?
The official ICD-10-CM descriptor is Menstrual migraine, not intractable, with status migrainosus. The FY2027 annual edition starts October 1, 2026. Check the edition that applies to the encounter or inpatient discharge, including any April update.
Is G43.821 billable in FY2027?
The FY2027 order file marks G43.821 as billable. Check the complete Tabular instructions and documentation before assigning it.
Does G43.821 map to an HCC?
G43.821 has no CMS-HCC V28 category in the CMS 2027 Initial ICD-10-CM Mappings (payment year 2027, 2026 dates of service). ESRD, RxHCC, PACE and HHS-HCC mappings are still pending verification for FY2027.
Source: CMS FY2027 ICD-10-CM order file. Read the FY2027 Official Guidelines.
Review the FY2026 April edition