A39.0 vs G01
A39.0 and G01 can never be reported together. ICD-10-CM declares them mutually exclusive with an Excludes1 note, meaning the two conditions cannot occur in the same patient — so exactly one of them is correct for any given encounter.
The official note, declared on G01
meningococcal (A39.0)
A39.0
Meningococcal meningitis
Billable
- Chapter 1
- Certain infectious and parasitic diseases
- Section
- A30-A49
Indexed under
- Fever › cerebrospinal meningococcal (inanition) (of unknown origin) (persistent) (with chills) (with rigor)
- Fever › petechial (inanition) (of unknown origin) (persistent) (with chills) (with rigor)
- Meningitis › cerebrospinal (basal) (basic) (brain) (cerebral) (cervical) (congestive) (diffuse) (hemorrhagic) (infantile) (membranous) (metastatic) (nonspecific) (pontine) (progressive) (simple) (spinal) (subacute) (sympathetic) (toxic)
- Meningitis › diplococcal (basal) (basic) (brain) (cerebral) (cervical) (congestive) (diffuse) (hemorrhagic) (infantile) (membranous) (metastatic) (nonspecific) (pontine) (progressive) (simple) (spinal) (subacute) (sympathetic) (toxic)
- Meningitis › epidemic NEC (basal) (basic) (brain) (cerebral) (cervical) (congestive) (diffuse) (hemorrhagic) (infantile) (membranous) (metastatic) (nonspecific) (pontine) (progressive) (simple) (spinal) (subacute) (sympathetic) (toxic)
G01
Meningitis in bacterial diseases classified elsewhere
Billable
- Chapter 6
- Diseases of the nervous system
- Section
- G00-G09
Indexed under
- Meningitis › in › bacterial disease NEC (basal) (basic) (brain) (cerebral) (cervical) (congestive) (diffuse) (hemorrhagic) (infantile) (membranous) (metastatic) (nonspecific) (pontine) (progressive) (simple) (spinal) (subacute) (sympathetic) (toxic)
These two codes sit in different chapters of the Tabular List, which is usually the clearest signal that they describe different underlying processes rather than different degrees of the same one.
Excludes1 is not always absolute: where two conditions covered by the note are genuinely unrelated, CMS guidance permits reporting both. Document the reasoning rather than assuming it. More on Excludes1 vs Excludes2 · FY2027