ICD-10-CM Tabular Index · Chapter 18 · FY 2026 R70–R79
Abnormal findings on examination of blood, without diagnosis (R70-R79) ICD-10-CM
The R70–R79 section covers abnormal findings on examination of blood, without diagnosis with 59 ICD-10-CM diagnosis codes, of which 44 are billable in fiscal year 2026. The section is organized into the 9 code ranges listed below.
✓ Built from the official CMS FY 2026 datasetEffective Oct 1, 2025 – Sep 30, 2026
9
Code Ranges
59
Diagnosis Codes
44
Billable Codes
R70–R79
Code Range
Type 2 Excludes
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.
abnormal findings on antenatal screening of mother O28
The info icon previews the code ranges inside each row and its instructional notations from the official Tabular List.
About the R70–R79 Code Range
ICD-10 codes R70-R79 cover abnormal blood test results and unusual findings on blood chemistry when no specific diagnosis has been made. These codes help report unexpected lab findings like abnormal blood glucose, enzyme levels, or presence of substances not normally found in the blood.
This range includes codes such as R70 for elevated erythrocyte sedimentation rate, which is a marker of inflammation. Codes under R73 address elevated blood glucose and conditions like impaired fasting glucose and prediabetes. Abnormal serum enzymes, including liver transaminases and lactate dehydrogenase, are reported with codes starting at R74. Blood chemistry abnormalities such as mineral imbalances and coagulation issues use codes like R79.0 and R79.1. Additionally, R78 series capture the detection of drugs or toxic substances in blood, for example, alcohol or lead levels (e.g., R78.0 or R78.71). These codes also include various nonspecific or inconclusive abnormal immunological findings (R75-R76) and unusual plasma protein levels (R77). Using synonyms like “erythrocyte sedimentation rate outside reference range” or “impaired glucose tolerance test” helps clarify correct code assignment for abnormal blood findings without confirmed diseases.
Questions About This Page
How many codes are in the R70-R79 range?
The R70-R79 range contains 59 ICD-10-CM diagnosis codes in FY 2026. 44 of them are billable, and the rest are category headers that organize the section.
What conditions does R70-R79 cover?
The range covers abnormal findings on examination of blood, without diagnosis. The code ranges listed above break it into groups of related conditions, and each one links to its own page with the full code list.
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 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.
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.
Nonconclusive HIV-test finding in infants
Type 1 Excludes
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.
asymptomatic human immunodeficiency virus [HIV] infection status Z21
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.
The “use additional code” indicates that a secondary code could be used to further specify the patient’s condition. This note is not mandatory and is only used if enough information is available to assign an additional code.
code to identify the any retained foreign body, if applicable Z18
Type 2 Excludes
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.
mental or behavioral disorders due to psychoactive substance use F10F19
The “use additional code” indicates that a secondary code could be used to further specify the patient’s condition. This note is not mandatory and is only used if enough information is available to assign an additional code.
code to identify any retained foreign body, if applicable Z18
Type 1 Excludes
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.
