E87 vs G72.3
E87 and G72.3 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 E87
familial periodic paralysis (G72.3)
E87
Other disorders of fluid, electrolyte and acid-base balance
Not billable
- Chapter 4
- Endocrine, nutritional and metabolic diseases
- Section
- E70-E88
G72.3
Periodic paralysis
Billable
- Chapter 6
- Diseases of the nervous system
- Section
- G70-G73
Use when the record says
- Familial periodic paralysis
- Hyperkalemic periodic paralysis (familial)
- Hypokalemic periodic paralysis (familial)
- Myotonic periodic paralysis (familial)
- Normokalemic paralysis (familial)
- Potassium sensitive periodic paralysis
Indexed under
- Adynamia (episodica) (hereditary) (periodic)
- Cavare's disease (familial periodic paralysis)
- Gamstorp's disease (adynamia episodica hereditaria)
- Disease, diseased › Cavare's
- Disease, diseased › familial periodic paralysis
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