DxCodebookFY2027 · Oct 1, 2026 – Sep 30, 2027

Category · FY2027

R79 Other abnormal findings of blood chemistry

  • Header · not billable

R79 is not billable. The category heads 7 billable codes in FY2027, grouped under 4 subdivisions.

Index → code

Where it sits

  1. Chapter 18 Symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R99)
  2. R70-R79 Abnormal findings on examination of blood, without diagnosis (R70-R79)
  3. R79 Other abnormal findings of blood chemistry
Billable codes
7
Subdivisions
4
CC / MCC codes
0 / 0
HCC V28 codes
0
New FY2027
0
Index entries
34

Codes in R79

  1. R79.0
    Abnormal level of blood mineral
    Billable
    Inclusion terms 6, Excludes1 4

    Inclusion terms

    • Abnormal blood level of cobalt
    • Abnormal blood level of copper
    • Abnormal blood level of iron
    • Abnormal blood level of magnesium
    • Abnormal blood level of mineral NEC
    • Abnormal blood level of zinc

    Excludes1

    • abnormal level of lithium (R78.89) R78.89
    • disorders of mineral metabolism (E83.-) E83
    • neonatal hypomagnesemia (P71.2) P71.2
    • nutritional mineral deficiency (E58-E61) E58 E61
  2. R79.1
    Abnormal coagulation profile
    Billable
    Inclusion terms 5, Excludes1 1, Excludes2 1

    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

    Excludes1

    • coagulation defects (D68.-) D68

    Excludes2

    • abnormality of fluid, electrolyte or acid-base balance (E86-E87) E86 E87
  3. R79.8
    Other specified abnormal findings of blood chemistry
    Header
  4. R79.81
    Abnormal blood-gas level
    Billable
  5. R79.82
    Elevated C-reactive protein (CRP)
    Billable
  6. R79.83
    Abnormal findings of blood amino-acid level
    Billable
    Inclusion terms 1, Excludes1 1

    Inclusion terms

    • Homocysteinemia

    Excludes1

    • disorders of amino-acid metabolism (E70-E72) E70 E72
  7. R79.89
    Other specified abnormal findings of blood chemistry
    Billable
  8. R79.9
    Abnormal finding of blood chemistry, unspecified
    Billable

Sources of each column.

Instructions

At R79

Excludes1

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

Excludes2

  • hyperglycemia NOS (R73.9) R73.9

Use additional code

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

Notes that also apply

Block R70-R79 instructions (Excludes2 7): printed on the block page.

Chapter 18 instructions (Notes 9, Excludes2 4): printed on the chapter 18 page.

Index entries

  • Homocysteinemia → R79.83
  • Homocystinemia → R79.83
  • Acetonemia → R79.89
  • Azotemia → R79.89
  • Melanemia → R79.89
  • Abnormal, abnormality, abnormalitiesbleeding time → R79.1
  • Abnormal, abnormality, abnormalitiespartial thromboplastin time (PTT) → R79.1
  • Abnormal, abnormality, abnormalitiesprothrombin time (PT) → R79.1
  • Lowvon Willebrand factor → R79.1
  • Prolonged, prolongation (of)bleeding (time) (idiopathic) → R79.1
  • Prolonged, prolongation (of)coagulation (time) → R79.1
  • Prolonged, prolongation (of)partial thromboplastin time (PTT) → R79.1
  • Prolonged, prolongation (of)prothrombin time → R79.1
  • Abnormal, abnormality, abnormalitiesblood-gas level → R79.81
  • Elevated, elevationC-reactive protein (CRP) → R79.82
  • Abnormal, abnormality, abnormalitiesblood amino-acid level → R79.83
  • Abnormal, abnormality, abnormalitiesliver function test → R79.89
  • Elevated, elevationtroponin → R79.89
  • Findings, abnormal, inconclusive, without diagnosisliver function test → R79.89
  • Abnormal, abnormality, abnormalitieschemistry, blood → R79.9
  • Abnormal, abnormality, abnormalitiesblood level (of)cobalt → R79.0
  • Abnormal, abnormality, abnormalitiesblood level (of)copper → R79.0
  • Abnormal, abnormality, abnormalitiesblood level (of)iron → R79.0
  • Abnormal, abnormality, abnormalitiesblood level (of)magnesium → R79.0
  • Abnormal, abnormality, abnormalitiesblood level (of)mineral NEC → R79.0
  • Abnormal, abnormality, abnormalitiesblood level (of)zinc → R79.0
  • Abnormal, abnormality, abnormalitieschemistry, bloodminerals → R79.0
  • Abnormal, abnormality, abnormalitieschemistry, bloodPTT → R79.1
  • Abnormal, abnormality, abnormalitiescoagulationprofile → R79.1
  • Abnormal, abnormality, abnormalitiescoagulationtime → R79.1
  • Abnormal, abnormality, abnormalitieschemistry, bloodgas level → R79.81
  • Abnormal, abnormality, abnormalitieschemistry, bloodC-reactive protein → R79.82
  • Abnormal, abnormality, abnormalitieschemistry, bloodspecified NEC → R79.89
  • Elevated, elevationliver functiontest → R79.89

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