E53.0 vs K13.0
E53.0 and K13.0 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 K13.0
ariboflavinosis (E53.0)
E53.0
Riboflavin deficiency
Billable
- Chapter 4
- Endocrine, nutritional and metabolic diseases
- Section
- E50-E64
Use when the record says
- Ariboflavinosis
- Vitamin B2 deficiency
Indexed under
- Ariboflavinosis
- Gopalan's syndrome (burning feet)
- Riboflavin deficiency
- Avitaminosis › B2 (multiple)
- Avitaminosis › G (multiple)
K13.0
Diseases of lips
Billable
- Chapter 11
- Diseases of the digestive system
- Section
- K00-K14
Use when the record says
- Abscess of lips
- Angular cheilitis
- Cellulitis of lips
- Cheilitis NOS
- Cheilodynia
- Cheilosis
- Exfoliative cheilitis
- Fistula of lips
Indexed under
- Angulus infectiosus (lips)
- Baelz's disease (cheilitis glandularis apostematosa)
- Cheilitis (acute) (angular) (catarrhal) (chronic) (exfoliative) (gangrenous) (glandular) (infectional) (suppurative) (ulcerative) (vesicular)
- Cheilodynia
- Cheilosis (angular)
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