2026 ICD-10-CM Diagnosis Code R79.1Abnormal coagulation profile
ICD-10-CM Codes›R00–R99›R70-R79›R79
- Billable — Valid for Submission
- Not Chronic
R79.1 is a billable ICD-10-CM diagnosis code for abnormal coagulation profile. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026) and groups to MS-DRG 947 through 948. As a symptom code, it should not be used as a principal diagnosis once a related definitive diagnosis has been established. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Abnormal findings without diagnosis.
Code Identity
Code Classification
Approximate SynonymsGuidance
Alternate terms and clinical phrases that map to this code.
- Clotting time above reference range
- Coag./bleeding tests abnormal
- Coagulation factor inhibitor detected in blood after transfusion of coagulation factors
- D-dimer above reference range
- Deviation of international normalized ratio from target range
- Extrinsic coagulation pathway finding
- Fibrinogen below reference range
- Fibrinogen in blood above reference range
- Fibrinogen screening finding
- Hormone replacement therapy bleed pattern - abnormal
- Hypocoagulability state
- International normalized ratio above reference range
- International normalized ratio below reference range
- International normalized ratio outside reference range
- Intrinsic coagulation pathway finding
- Menopause monitoring status
- Partial thromboplastin time below reference range
- Partial thromboplastin time finding
- Partial thromboplastin time increased
- Prothrombin time abnormal
- Prothrombin time finding
- Prothrombin time increased
- Prothrombin time low
- Thrombin time above reference range
- Thrombin time below reference range
- Thrombin time outside reference range
Tabular List NotesGuidance
Coding notes and annotation back-references applicable to this code.
Inclusion Terms
- 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
Type 1 Excludes
- coagulation defects D68
Type 2 Excludes
These terms are the conditions for which that code is to be used. The terms may be synonyms of the code title, or, in the case of "other specified" codes, the terms are a list of the various conditions assigned to that code. The inclusion terms are not necessarily exhaustive. Additional terms found only in the Alphabetic Index may also be assigned to a code.
A type 1 excludes note is a pure excludes note. It means "NOT CODED HERE!" An Excludes1 note indicates that the code excluded should never be used at the same time as the code above the Excludes1 note. An Excludes1 is used when two conditions cannot occur together, such as a congenital form versus an acquired form of the same condition.
A type 2 excludes note represents "Not included here". An excludes2 note indicates that the condition excluded is not part of the condition represented by the code, but a patient may have both conditions at the same time. When an Excludes2 note appears under a code, it is acceptable to use both the code and the excluded code together, when appropriate.
Index to Diseases and InjuriesGuidance
Alphabetical index entries that point to this code.
- Abnormal, abnormality, abnormalities - See Also: Anomaly;
- bleeding time - R79.1
- PTT - R79.1
- coagulation - D68.9
- partial thromboplastin time (PTT) - R79.1
- prothrombin time (PT) - R79.1
- Low
- von Willebrand factor - R79.1
- Prolonged, prolongation (of)
- bleeding (time) (idiopathic) - R79.1
- coagulation (time) - R79.1
- partial thromboplastin time (PTT) - R79.1
- prothrombin time - R79.1
External Cause of Injuries IndexGuidance
References for this code in the External Cause of Injuries Index.
- 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
Clinical ClassificationClinical
AHRQ’s CCSR groups this code into broader clinical categories.
Patient EducationClinical
Blood
Your blood is made up of liquid and solids. The liquid part, called plasma, is made of water, salts, and protein. Over half of your blood is plasma. The solid part of your blood contains red blood cells, white blood cells, and platelets.
Read the full article at MedlinePlus
Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.
Convert R79.1 to ICD-9-CMHistory
The closest ICD-9-CM equivalents under the General Equivalence Mappings.
Code HistoryHistory
Questions About R79.1Overview
Is R79.1 (Other abnormal findings of blood chemistry) a billable code?
Yes. This is a billable ICD-10-CM code, specific enough to report abnormal coagulation profile on HIPAA-covered claims from October 1, 2025 through September 30, 2026.
What MS-DRG does R79.1 group to?
When abnormal coagulation profile is the principal diagnosis on an inpatient stay, it groups to MS-DRG 947, 948, with relative weights from 0.8005 to 1.2694 depending on complications. Higher weights mean higher Medicare reimbursement.
Can R79.1 be a principal diagnosis?
Use it with care. This is a symptom code, so once a definitive diagnosis explaining the abnormal coagulation profile is established, that condition takes the principal position instead.
What is the ICD-9 equivalent of R79.1?
Under the General Equivalence Mappings, abnormal coagulation profile converts to ICD-9-CM 790.92 (abnrml coagultion prfile). The mapping is a direct match.
Footnotes
[1] Not chronic - A diagnosis code that does not fit the criteria for chronic condition (duration, ongoing medical treatment, and limitations) is considered not chronic. Some codes designated as not chronic are acute conditions. Other diagnosis codes that indicate a possible chronic condition, but for which the duration of the illness is not specified in the code description (i.e., we do not know the condition has lasted 12 months or longer) also are considered not chronic.
