D68 vs R79.1
D68 and R79.1 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 D68
abnormal coagulation profile NOS (R79.1)
D68
Other coagulation defects
Not billable
- Chapter 3
- Diseases of the blood and blood-forming organs and certain disorders involving the immune mechanism
- Section
- D65-D69
R79.1
Abnormal coagulation profile
Billable
- Chapter 18
- Symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified
- Section
- R70-R79
Use when the record says
- Abnormal or prolonged bleeding time
- Abnormal or prolonged coagulation time
- Abnormal or prolonged partial thromboplastin time [PTT]
- Abnormal or prolonged prothrombin time [PT]
- Low von Willebrand factor
Indexed under
- Abnormal, abnormality, abnormalities › bleeding time
- Abnormal, abnormality, abnormalities › partial thromboplastin time
- Abnormal, abnormality, abnormalities › prothrombin time
- Low › von Willebrand factor
- Prolonged, prolongation › bleeding (of)
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