F50.9 vs R13.0
F50.9 and R13.0 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 R13.0
psychogenic aphagia (F50.9)
F50.9
Eating disorder, unspecified
BillableUnspecified
- Chapter 5
- Mental, Behavioral and Neurodevelopmental disorders
- Section
- F50-F59
Use when the record says
- Atypical anorexia nervosa
- Atypical bulimia nervosa
- Feeding or eating disorder, unspecified
- Other specified feeding disorder
Indexed under
- Aphagia › psychogenic
- Bulimia › atypical (nervosa)
- Bulimia › normal weight (nervosa)
- Disorder › eating (of)
- Anorexia › nervosa › atypical
R13.0
Aphagia
Billable
- Chapter 18
- Symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified
- Section
- R10-R19
Use when the record says
- Inability to swallow
Indexed under
- Aphagia
- Deglutition › paralysis
- Paralysis, paralytic › deglutition (complete) (incomplete)
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