R79.8 – Other specified abnormal findings of blood chemistry

ICD-10-CM 2027 diagnosis code · Abnormal findings on examination of blood, without diagnosis

Non-billable header

ICD-10-CM code R79.8

Code: R79.8 (claims format: R798)
Description: Other specified abnormal findings of blood chemistry
Billable: No – use a more specific code below
Valid for: Dates of service October 1, 2026 – September 30, 2027 (FY2027)
Chapter: 18. Symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R99)
Block: R70-R79 Abnormal findings on examination of blood, without diagnosis
Parent codes: R79

Billable codes under R79.8

R79.8 is a header code and cannot be used on claims. Choose the most specific code:

R79.81 – Abnormal blood-gas levelBillable
R79.82 – Elevated C-reactive protein (CRP)Billable
R79.83 – Abnormal findings of blood amino-acid levelBillable
R79.89 – Other specified abnormal findings of blood chemistryBillable

Notes inherited from parent codes

Instructional notes at a category or block level apply to every code below it.

R79 – Other abnormal findings of blood chemistry

Excludes1 (not coded here):

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 (not included here):

hyperglycemia NOS (R73.9)

Use additional code:

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

Block R70-R79

Excludes2 (not included here):

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)

Related codes in R79

R79.0 – Abnormal level of blood mineralBillable
R79.1 – Abnormal coagulation profileBillable
R79.9 – Abnormal finding of blood chemistry, unspecifiedBillable

Frequently asked questions

What is ICD-10 code R79.8?

R79.8 is the ICD-10-CM code for other specified abnormal findings of blood chemistry, in the block R70-R79 (Abnormal findings on examination of blood, without diagnosis).

Is R79.8 a billable code?

No. R79.8 is a header code with more specific child codes; report one of the billable codes listed above.

What category does R79.8 belong to?

It belongs to category R79 – Other abnormal findings of blood chemistry.

Source: CDC/NCHS ICD-10-CM FY2027 code files, tabular list and index. Reference only – code assignment must follow the official ICD-10-CM guidelines and documentation in the medical record.