ICD-10-CM 2027 diagnosis code
R79.83Abnormal findings of blood amino-acid level
R79.83 is a valid, billable ICD-10-CM code for abnormal findings of blood amino-acid level. It can be reported on claims for dates of service from October 1, 2026 – September 30, 2027.
Looking up by condition? See ICD-10 code for Homocystinemia, ICD-10 code for Homocysteinemia.
Code last changed in FY2022 (effective October 1, 2021). Source: official FY2027 ICD-10-CM release from CDC/NCHS and CMS. Page updated September 29, 2026. About our data
About R79.83
R79.83 is the ICD-10-CM diagnosis code for abnormal findings of blood amino-acid level. It belongs to category R79 (other abnormal findings of blood chemistry), block R70-R79 (abnormal findings on examination of blood, without diagnosis) and chapter 18 (symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified). It is billable, so it can be reported on its own for dates of service from October 1, 2026 through September 30, 2027.
Within R79.8 (other specified abnormal findings of blood chemistry), R79.83 is specifically for abnormal findings of blood amino-acid level. Related codes cover abnormal blood-gas level (R79.81), elevated C-reactive protein (CRP) (R79.82) and other specified abnormal findings of blood chemistry (R79.89).
Don't report R79.83 together with the conditions in its Excludes1 note: disorders of amino-acid metabolism (E70-E72).
Use an additional code to identify any retained foreign body, if applicable (Z18.-).
It is not a CC or MCC, so as a secondary diagnosis it doesn't change the MS-DRG severity level.
In MS-DRG v44.0, it is part of the grouping logic for DRG 947 (Signs and Symptoms with MCC, relative weight 1.261) and DRG 948 (Signs and Symptoms without MCC, relative weight 0.7835), in MDC 23 (Factors Influencing Health Status and Other Contacts with Health Services), as a principal or secondary diagnosis. The DRG a claim lands in depends on the principal diagnosis, procedures and any CC/MCC secondary diagnoses.
It was added in FY2022, effective October 1, 2021.
Coding notes
Notes that apply from higher levels
Instructions written at a parent level also apply to R79.83.
› From R79 Other abnormal findings of blood chemistry
- 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.-)
- hyperglycemia NOS (R73.9)
- code to identify any retained foreign body, if applicable (Z18.-)
Broader instructions also apply from R70-R79 Abnormal findings on examination of blood, without diagnosis and Chapter 18: Symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified.
Alphabetic index entries
3 entriesTerms in the official ICD-10-CM index that lead to R79.83.
MS-DRG v44.0 grouping
All DRGs →Inpatient MS-DRGs this diagnosis can group to, as the principal or a secondary diagnosis, depending on the rest of the claim.
MDC 23 · Factors Influencing Health Status and Other Contacts with Health Services
Code history
- 2016
- 2017
- 2018
- 2019
- 2020
- 2021
- 2022
- 2023
- 2024
- 2025
- 2026
- 2027
- FY2022 (effective 10/1/2021): Added
- No changes since FY2022.
Common questions about R79.83
Is R79.83 billable?
- Yes. R79.83 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can R79.83 be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict R79.83 as a principal diagnosis.
Is R79.83 a CC or MCC?
- No. R79.83 is neither a CC nor an MCC under MS-DRG v44.0.
What DRG does R79.83 group to?
- R79.83 is used in the MS-DRG v44.0 logic for MS-DRG 947 (Signs and Symptoms with MCC) and MS-DRG 948 (Signs and Symptoms without MCC). Which one applies depends on whether it is the principal diagnosis and on the rest of the claim.