2026 ICD-10-CM Diagnosis Code R79.83Abnormal findings of blood amino-acid level
ICD-10-CM Codes›R00–R99›R70-R79›R79
- Billable — Valid for Submission
- Not Chronic
R79.83 is a billable ICD-10-CM diagnosis code for abnormal findings of blood amino-acid level. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026) and groups to MS-DRG 947 through 948. As a symptom code, it should not be used as a principal diagnosis once a related definitive diagnosis has been established. Coders also document this condition as amino acid below reference range. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Abnormal findings without diagnosis.
Code Identity
Code Classification
Approximate SynonymsGuidance
Alternate terms and clinical phrases that map to this code.
- Amino acid below reference range
- Homocystinemia
- Serum amino acid above reference range
- Serum amino acid below reference range
- Serum amino acid levels - finding
- Serum amino acids outside reference range
Tabular List NotesGuidance
Coding notes and annotation back-references applicable to this code.
Inclusion Terms
- Homocysteinemia
Type 1 Excludes
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.
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.
Index to Diseases and InjuriesGuidance
Alphabetical index entries that point to this code.
- Abnormal, abnormality, abnormalities - See Also: Anomaly;
- blood amino-acid level - R79.83
- Homocysteinemia - R79.83
- Homocystinemia - R79.83
External Cause of Injuries IndexGuidance
References for this code in the External Cause of Injuries Index.
- Abnormal, abnormality, abnormalities
- blood amino-acid level
- Homocysteinemia
- Homocystinemia
Clinical ClassificationClinical
AHRQ’s CCSR groups this code into broader clinical categories.
Code History & ChangesHistory
Replacement R79.83 replaces the following previously assigned code(s):
- R79.89 - Other specified abnormal findings of blood chemistry
Questions About R79.83Overview
Is R79.83 (Other specified abnormal findings of blood chemistry) a billable code?
Yes. This is a billable ICD-10-CM code, specific enough to report abnormal findings of blood amino-acid level on HIPAA-covered claims from October 1, 2025 through September 30, 2026.
What MS-DRG does R79.83 group to?
When abnormal findings of blood amino-acid level is the principal diagnosis on an inpatient stay, it groups to MS-DRG 947, 948, with relative weights from 0.8005 to 1.2694 depending on complications. Higher weights mean higher Medicare reimbursement.
Can R79.83 be a principal diagnosis?
Use it with care. This is a symptom code, so once a definitive diagnosis explaining the abnormal findings of blood amino-acid level is established, that condition takes the principal position instead.
Footnotes
[1] Not chronic - A diagnosis code that does not fit the criteria for chronic condition (duration, ongoing medical treatment, and limitations) is considered not chronic. Some codes designated as not chronic are acute conditions. Other diagnosis codes that indicate a possible chronic condition, but for which the duration of the illness is not specified in the code description (i.e., we do not know the condition has lasted 12 months or longer) also are considered not chronic.
