ICD-10-CM 2027
ICD-10 code for flaccid myelitis
From the official ICD-10-CM alphabetic index entry “Myelitis (acute) (ascending) (childhood) (chronic) (descending) (diffuse) (disseminated) (idiopathic) (pressure) (progressive) (spinal cord) (subacute) › flaccid”. Page updated September 29, 2026.
About coding flaccid myelitis
The ICD-10-CM code for flaccid myelitis is G04.82 (Acute flaccid myelitis).
Within G04.8 (other encephalitis, myelitis and encephalomyelitis), G04.82 is specifically for acute flaccid myelitis. Related codes cover other encephalitis and encephalomyelitis (G04.81) and other myelitis (G04.89).
Don't report G04.82 together with the conditions in its Excludes1 note: transverse myelitis (G37.3).
As a secondary diagnosis it is an MCC (major complication or comorbidity), which can move an inpatient stay into the highest-paying "with MCC" MS-DRG of its family, unless the principal diagnosis excludes it.
Don't confuse with (Excludes1 for G04.82)
- transverse myelitis (G37.3)
Common questions about flaccid myelitis ICD-10 codes
What is the ICD-10 code for flaccid myelitis?
- G04.82 — Acute flaccid myelitis.
Is G04.82 billable?
- Yes. G04.82 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can G04.82 be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict G04.82 as a principal diagnosis.
Is G04.82 a CC or MCC?
- G04.82 is an MCC (major complication or comorbidity) under MS-DRG v44.0, unless excluded by the principal diagnosis.