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D68.52 vs R79.1

D68.52 (Prothrombin gene mutation) compared with R79.1 (Abnormal coagulation profile), from the official CMS tabular data.

Summary

These codes should not be reported together because D68.52’s tabular entry lists R79.1 under Excludes1.

Official rule
What is different?

The conditions named and chapter.D68.52 is “Prothrombin gene mutation”; R79.1 is “Abnormal coagulation profile”. D68.52 sits in D50-D89 — Diseases of the Blood and Blood-forming Organs and Certain Disorders Involving the Immune Mechanism (D50-D89); R79.1 in R00-R99 — Symptoms, Signs and Abnormal Clinical and Laboratory Findings, Not Elsewhere Classified (R00-R99).

Registry fact

Can these codes be reported together?

No.D68.52’s entry carries an Excludes1 note covering R79.1: “abnormal coagulation profile NOS (R79.1)”. Both may be reported only when the documentation shows the two conditions are unrelated to each other (ICD-10-CM Official Guidelines, Section I.A.12.a).

Official ruleGuide: Excludes1 vs Excludes2

Is there an Excludes1 relationship?

Yes.D68.52’s tabular entry: “abnormal coagulation profile NOS (R79.1)”. The note covers R79.1.

Official ruleGuide: Excludes1 vs Excludes2

Is there an Excludes2 relationship?

Yes.R79.1’s tabular entry: “coagulation hemorrhagic disorders (D65-D68)”. The note covers D68.52.

Official ruleGuide: Excludes1 vs Excludes2

Is one more specific?

Not comparable.The codes sit in different categories; specificity is only comparable within one category.

Is one a parent or header code?

No.Both are billable codes, and neither contains the other.

Registry fact

Are there sequencing instructions?

None.Neither entry carries a Code First or Use Additional Code note that names the other.

Official rule

Are there other coding relationships?

None found.No laterality, encounter-phase, Table of Neoplasms, Table of Drugs and Chemicals, or history-versus-active-disease relationship links these codes.

MedCoder-derived

Official rule: a tabular instructional note or a section of the ICD-10-CM Official Guidelines, quoted as published. Registry fact: the codes’ own published attributes (titles, billable status, position in the hierarchy, code set). MedCoder-derived: a reading MedCoder computes from those facts; it is not itself a rule. How to read the labels

Can these codes be reported together?

Excludes1 — generally not reported together

Excludes1 conflict

D68.52
Prothrombin gene mutation
↔
R79.1
Abnormal coagulation profile

What we found

No — do not report together.D68.52 carries an Excludes1 note covering R79.1: “abnormal coagulation profile NOS (R79.1)”

Sole exception: when the two conditions are documented as unrelated to each other (ICD-10-CM Official Guidelines, Section I.A.12.a).

What to review

Report one of the two. Both may be reported only when the documentation shows the two conditions are unrelated to each other.

Guide: Excludes1 vs Excludes2Check these on a claim

Why it matters

An Excludes1 note means the two conditions are not ordinarily reported together for the same encounter, because the classification treats them as mutually exclusive forms of the same condition. The documented exception is when the two conditions are unrelated to each other.

Source / rule

CMS ICD-10-CM tabular instructional notes; ICD-10-CM Official Guidelines, Section I.A.12.a

Informational

Excludes2 relationship

R79.1
Abnormal coagulation profile
↔
D68.52
Prothrombin gene mutation

What we found

Yes, when both are documented.R79.1 carries an Excludes2 note covering D68.52: “coagulation hemorrhagic disorders (D65-D68)”

Excludes2 marks distinct conditions — both may be reported when both are documented.

What to review

Report both only when the documentation supports both conditions; otherwise report the one documented.

Guide: Excludes1 vs Excludes2Check these on a claim

Why it matters

An Excludes2 note means the excluded condition is not part of the code above it, but a patient can have both. Report both when both are documented.

Source / rule

CMS ICD-10-CM tabular instructional notes

Official guidance behind these answers

  • Section I.A.12.a — Excludes1 · applies to: Excludes1

    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. An exception to the Excludes1 definition is the circumstance when the two conditions are unrelated to each other. If it is not clear whether the two conditions involving an Excludes1 note are related or not, query the provider. For example, code F45.8, Other somatoform disorders, has an Excludes1 note for "sleep related teeth grinding (G47.63)," because "teeth grinding" is an inclusion term under F45.8. Only one of these two codes should be assigned for teeth grinding. However psychogenic dysmenorrhea is also an inclusion term under F45.8, and a patient could have both this condition and sleep related teeth grinding. In this case, the two conditions are clearly unrelated to each other, and so it would be appropriate to report F45.8 and G47.63 together.

    ICD-10-CM Official Guidelines FY2026

  • Section I.A.12.b — Excludes2 · applies to: Excludes2

    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.

    ICD-10-CM Official Guidelines FY2026

Quoted from the ICD-10-CM Official Guidelines for Coding and Reporting in effect for the release shown. The tabular notes above are the code-level instruction; these sections are the convention that says how such a note is applied. Source document (CMS PDF) · Release and checksum

Side by side

D68.52Prothrombin gene mutationR79.1Abnormal coagulation profile
Billing statusBillableBillable
ClassificationD50-D89 — Diseases of the Blood and Blood-forming Organs and Certain Disorders Involving the Immune Mechanism (D50-D89)R00-R99 — Symptoms, Signs and Abnormal Clinical and Laboratory Findings, Not Elsewhere Classified (R00-R99)
DefinitionProthrombin gene mutation is a billable ICD-10-CM diagnosis code (D68.52).Abnormal coagulation profile is a billable ICD-10-CM diagnosis code (R79.1).
Includes—
Abnormal or prolonged bleeding time
Abnormal or prolonged coagulation time
Abnormal or prolonged partial thromboplastin time [PTT]
Abnormal or prolonged prothrombin time [PT]
Excludes1
antiphospholipid syndrome (D68.61)
lupus anticoagulant (D68.62)
secondary activated protein C resistance (D68.69)
secondary antiphospholipid antibody syndrome (D68.69)
secondary lupus anticoagulant with hypercoagulable state (D68.69)
secondary systemic lupus erythematosus [SLE] inhibitor with hypercoagulable state (D68.69)
systemic lupus erythematosus [SLE] inhibitor finding without diagnosis (R76.0)
systemic lupus erythematosus [SLE] inhibitor with hemorrhagic disorder (D68.312)
thrombotic thrombocytopenic purpura (M31.19)
abnormal coagulation profile NOS (R79.1)
coagulation defects (D68.-)
asymptomatic hyperuricemia (E79.0)
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.-)
Excludes2
coagulation defects complicating abortion or ectopic or molar pregnancy (O00-O07, O08.1)
coagulation defects complicating pregnancy, childbirth and the puerperium (O45.0, O46.0, O67.0, O72.3)
abnormality of fluid, electrolyte or acid-base balance (E86-E87)
hyperglycemia NOS (R73.9)
abnormal findings on antenatal screening of mother (O28.-)
abnormalities of lipids (E78.-)
abnormalities of platelets and thrombocytes (D69.-)
abnormalities of white blood cells classified elsewhere (D70-D72)
coagulation hemorrhagic disorders (D65-D68)
diagnostic abnormal findings classified elsewhere - see Alphabetical Index
hemorrhagic and hematological disorders of newborn (P50-P61)
Use additional code—
code to identify any retained foreign body, if applicable (Z18.-)

Notes are the code’s own tabular entry, quoted as published. A note that names the other code is the one the verdict above rests on.

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Derived from the official CMS ICD-10-CM tabular data (FY2027). A coding-rule comparison, not billing advice: payer-specific edits and medical-necessity policy are outside its scope. All data sources