ICD-10 Code for Elevated Liver Enzymes
For elevated liver transaminases (ALT/AST) without an identified specific liver disease, use ICD-10-CM code R74.01 (Elevation of levels of liver transaminase levels [ALT, AST]) or R74.0 (Nonspecific elevation of levels of transaminase and lactic acid dehydrogenase [LDH]).
Coding Guidance
The appropriate ICD-10-CM code depends on documentation specificity:
- R74.01: Use when specifically documenting elevated transaminases (ALT and/or AST)
- R74.0: Use for more general elevation of liver enzymes including transaminases and LDH
- R94.5: Abnormal results of liver function studies (broader, less specific)
Critical Clinical Context
While this addresses your coding question, recognize that the magnitude of enzyme elevation does not correlate with clinical significance or prognosis 1. The clinical context and specific pattern of elevation matter far more than the absolute values.
Pattern Recognition Matters
When documenting elevated transaminases, distinguish the pattern:
- Hepatocellular pattern: ALT/AST elevated disproportionately higher than alkaline phosphatase 2
- Cholestatic pattern: Alkaline phosphatase elevated with or without bilirubin elevation 2
- AST:ALT ratio: >2 suggests alcohol-related disease; <1 suggests metabolic/NAFLD 2
Severity Classification
Document severity to guide workup 2:
- Mild: <5 times upper reference limit
- Moderate: 5-10 times upper reference limit
- Severe: >10 times upper reference limit
Common Pitfalls
Do not assume normal enzymes exclude significant liver disease. Many patients with advanced fibrosis or cirrhosis have normal transaminases 1. The current upper limits of normal for ALT may be too high due to inclusion of patients with occult NAFLD in reference ranges 1.
Do not code a specific liver disease diagnosis (e.g., K76.0 for fatty liver) based solely on elevated enzymes without confirmatory imaging or biopsy. The most common causes of mild transaminase elevation—NAFLD and alcohol-related liver disease—require additional diagnostic confirmation 2.
When to Use More Specific Codes
Once a specific etiology is identified through workup, transition to disease-specific codes:
- K76.0: Fatty change of liver, not elsewhere classified
- K70.x: Alcoholic liver disease
- K73.x: Chronic hepatitis
- K74.x: Fibrosis and cirrhosis of liver
Avoid using R74.01 as a chronic diagnosis. It represents an abnormal finding requiring investigation, not a final diagnosis 1.