Excludes1 pair

D68- vs R79.1

D68 and R79.1 are not coded together. ICD-10-CM declares them mutually exclusive with an Excludes1 note — the two conditions are not expected to occur together, so exactly one of them is normally correct for a given encounter. The Official Guidelines carve out one exception: if the two conditions are clearly unrelated to each other, both may be reported.

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 (PTT)
Abnormal, abnormality, abnormalities › prothrombin time (PT)
Low › von Willebrand factor
Prolonged, prolongation › bleeding (time) (idiopathic)

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