R79.1 Abnormal coagulation profile

Billable ICD-10-CM code, FY2026.

Applicable to

• 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

Excludes1 (never code together)

• coagulation defects (D68.-)

Excludes2 (not included here)

• abnormality of fluid, electrolyte or acid-base balance (E86-E87)

Applies from R79 Other abnormal findings of blood chemistry

Excludes1 (never code together)

• asymptomatic hyperuricemia (E79.0)
• hyperglycemia NOS (R73.9)
• hypoglycemia NOS (E16.2)
• neonatal hypoglycemia (P70.3-P70.4)
• specific findings indicating disorder of amino-acid metabolism (E70-E72)
• specific findings indicating disorder of carbohydrate metabolism (E73-E74)
• specific findings indicating disorder of lipid metabolism (E75.-)

Use additional code

• code to identify any retained foreign body, if applicable (Z18.-)

MS-DRG index

Defines the logic of DRG(s) 947-948 in MDC 23.

Approximate ICD-9-CM (GEMs)

• 790.92 Abnormal coagulation profile

Code annotations containing back-references to R79.1

Back-references to R79.1

• Type 1 Excludes: D68 Other coagulation defects ("abnormal coagulation profile NOS (R79.1)")

Diagnosis Index entries for R79.1

• Abnormal, abnormality, abnormalities › bleeding time
• Abnormal, abnormality, abnormalities › chemistry, blood › PTT
• Abnormal, abnormality, abnormalities › coagulation › profile
• Abnormal, abnormality, abnormalities › coagulation › time
• Abnormal, abnormality, abnormalities › partial thromboplastin time (PTT)
• Abnormal, abnormality, abnormalities › prothrombin time (PT)
• Low › von Willebrand factor
• Prolonged, prolongation (of) › bleeding (time) (idiopathic)
• Prolonged, prolongation (of) › coagulation (time)
• Prolonged, prolongation (of) › partial thromboplastin time (PTT)
• Prolonged, prolongation (of) › prothrombin time

Nearby codes

• R79 Other abnormal findings of blood chemistry
• R79.0 Abnormal level of blood mineral
• R79.1 Abnormal coagulation profile (this code)
• R79.8 Other specified abnormal findings of blood chemistry
• R79.81 Abnormal blood-gas level
• R79.82 Elevated C-reactive protein (CRP)
• R79.83 Abnormal findings of blood amino-acid level
• R79.89 Other specified abnormal findings of blood chemistry