Other abnormal findings of blood chemistry (R79) ICD-10-CM
The R79 code range covers other abnormal findings of blood chemistry with 9 ICD-10-CM diagnosis codes. 7 of them are billable and valid for claim submission in fiscal year 2027, and the category headers group them but cannot themselves be billed.
Use Additional Code
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.
- 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
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.
- hyperglycemia NOS R73.9
Codes in the R79 Range 9 codes · 7 billable
- R79 Other abnormal findings of blood chemistryNon-billable
- R79.0 Abnormal level of blood mineral
- R79.1 Abnormal coagulation profile
- R79.8 Other specified abnormal findings of blood chemistryNon-billable
- 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
- R79.9 Abnormal finding of blood chemistry, unspecified
Clinical Terms in This Code Range
Definitions from the National Library of Medicine for conditions coded in the R79 range.
Azotemia
A biochemical abnormality referring to an elevation of BLOOD UREA NITROGEN and CREATININE. Azotemia can be produced by KIDNEY DISEASES or other extrarenal disorders. When azotemia becomes associated with a constellation of clinical signs, it is termed UREMIA.
About the R79 Code Range
These are abnormal blood test findings without a diagnosis. R79 groups findings involving blood chemistry.
R79.0 identifies abnormal blood mineral levels, while R79.1 identifies abnormal blood clotting test results. R79.8 groups other specified blood chemistry findings, with subdivisions for blood-gas levels, elevated C-reactive protein, amino-acid levels, and other specified findings. R79.9 identifies an abnormal blood chemistry finding when its type is unspecified.
Questions About This Page
How many billable codes are in the R79 range?
Of the 9 codes in this range, 7 are billable and valid for claim submission from October 1, 2026 through September 30, 2027. Category header codes group them but cannot be reported on claims.
What does the R79 range classify?
The range classifies other abnormal findings of blood chemistry. Each code links to its own reference page with billing status, MS-DRG grouping, coding notes, and clinical information.
Related References
Source: CMS FY 2027 ICD-10-CM Tabular List and order file, effective October 1, 2026 through September 30, 2027.
