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ICD-10/R79.83

R79.83 ICD-10-CM Code: Abnormal findings of blood amino-acid level

Billing Status: YES. This is a valid, specific, and billable ICD-10-CM reference.

Inpatient Payment Groups (MS-DRG)

MS-DRGs this diagnosis helps define, as principal or secondary, per the CMS ICD-10-CM/PCS MS-DRG Definitions Manual v43.0, Appendix B.

  • MS-DRG 947 — SIGNS AND SYMPTOMS WITH MCC (MDC 23)
  • MS-DRG 948 — SIGNS AND SYMPTOMS WITHOUT MCC (MDC 23)

A diagnosis appearing in a group's logic does not by itself determine the DRG assigned to a stay; the grouper uses the full claim.

Official Registry Overview & Definition

Abnormal findings of blood amino-acid level is a billable ICD-10-CM diagnosis code (R79.83).

Official Tabular Instructional Notes

Sequencing, inclusion, and exclusion notes published for R79.83 in the official ICD-10-CM tabular list.

Inclusion Terms

Alternative terms the tabular list files under this code.

  • Homocysteinemia

Excludes1 — Not Coded Here

Conditions generally not reported together with this code (Excludes1) -- an error unless the two conditions are documented as unrelated to each other (ICD-10-CM Official Guidelines, Section I.A.12.a).

Excludes2 — Not Included Here

Conditions not covered by this code, but which may be reported alongside it when both are present.

Use Additional Code

Supplementary codes the tabular list directs you to add.

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

Change history

  • FY2027 — 2026-10-01
    Excludes2 note added
    hyperglycemia NOS (R73.9)
    FY2027 changes
  • FY2027 — 2026-10-01
    Excludes1 note removed
    hyperglycemia NOS (R73.9)
    FY2027 changes
  • FY2022 — 2021-10-01
    Added to the code set
    Abnormal findings of blood amino-acid level
    FY2022 changes

Verify Before Coding

  • Billable — reportable as written.

From the code registry, the Medicare Code Editor, and the MS-DRG Definitions Manual. Check it against a full claim.

Contextual Map

Every relationship of R79.83 in one view: hierarchy, official tabular instructions in both directions, clinical classification, risk adjustment, MS-DRG participation, index terms and change history — each edge carrying the CMS source it derives from.

Hierarchy

  • R79.8 — Other specified abnormal findings of blood chemistry [Hierarchy]

Excludes1

  • E70 — Disorders of aromatic amino-acid metabolism [Excludes1]: “disorders of amino-acid metabolism (E70-E72)”
  • E72 — Other disorders of amino-acid metabolism [Excludes1]: “disorders of amino-acid metabolism (E70-E72)”

Clinical classification (CCSR)

  • SYM017 — Abnormal findings without diagnosis [CCSR]

Potential MS-DRG

  • DRG 947 — SIGNS AND SYMPTOMS WITH MCC [MS-DRG]: “SIGNS AND SYMPTOMS WITH MCC (MDC 23)”
  • DRG 948 — SIGNS AND SYMPTOMS WITHOUT MCC [MS-DRG]: “SIGNS AND SYMPTOMS WITHOUT MCC (MDC 23)”

Index entries

  • Abnormal, abnormality, abno… — Abnormal, abnormality, abnormalities, blood amino-acid level [Index term]
  • Homocysteinemia[Index term]
  • Homocystinemia[Index term]

Nearest codes

  • R79 — Other abnormal findings of blood chemistry [Sibling]
  • R79.0 — Abnormal level of blood mineral [Sibling]
  • R79.1 — Abnormal coagulation profile [Sibling]
  • R79.8 — Other specified abnormal findings of blood chemistry [Sibling]
  • R79.81 — Abnormal blood-gas level [Sibling]
  • R79.82 — Elevated C-reactive protein (CRP) [Sibling]
  • R79.89 — Other specified abnormal findings of blood chemistry [Sibling]
  • R79.9 — Abnormal finding of blood chemistry, unspecified [Sibling]

Change history (3)

  • FY2027 — Excludes2 note added [Change history]
  • and 2 more

Relationships & Classification

Clinical classification (AHRQ CCSR):SYM017 — Abnormal findings without diagnosis (default).

Clinical Classifications Software Refined (CCSR) for ICD-10-CM Diagnoses. Healthcare Cost and Utilization Project (HCUP), Agency for Healthcare Research and Quality.

Potential MS-DRG Relationships (FY2026)

Not on the CMS CC/MCC list — as a secondary diagnosis this code does not change MS-DRG severity.

Named in the grouper logic of 2 MS-DRGs: DRG 947 (MDC 23), DRG 948 (MDC 23).

From the CMS MS-DRG Definitions Manual (Appendices B and C). Actual DRG assignment depends on the complete claim.

Nearest Codes in This Family

Official ICD-10-CM classifications closest to R79.83 in its code family, with their registry titles.

  • R79 — Other abnormal findings of blood chemistry
  • R79.0 — Abnormal level of blood mineral
  • R79.1 — Abnormal coagulation profile
  • R79.8 — Other specified abnormal findings of blood chemistry
  • R79.81 — Abnormal blood-gas level
  • R79.82 — Elevated C-reactive protein (CRP)
  • R79.89 — Other specified abnormal findings of blood chemistry
  • R79.9 — Abnormal finding of blood chemistry, unspecified

View all codes in the R79 family

Indexed Clinical Terms (3)

Clinical term phrases from the official ICD-10-CM Index to Diseases and Injuries that map to this code.

  • Abnormal, abnormality, abnormalities, blood amino-acid level
  • Homocysteinemia
  • Homocystinemia