Fatty liver disease is increasingly common, and accurately coding it is no longer optional for healthcare providers. Whether you’re managing a patient with simple steatosis, nonalcoholic steatohepatitis (NASH), or an alcohol-related liver condition, understanding the correct fatty liver ICD 10 codes is essential for precise documentation, compliant billing, and optimized reimbursement.
This guide is designed specifically for medical professionals who want a reliable, practical resource for navigating fatty liver disease ICD 10 coding. With everything from NAFLD to drug-induced steatosis and pregnancy-related conditions, we’ve got you covered so you can code confidently and bill correctly, every time.
Why Accurate ICD-10 Coding for Fatty Liver Matters
For healthcare providers, accurate use of the ICD-10 code for fatty liver has a direct impact on:
- Clinical decision-making: Helps track disease progression and associated comorbidities
- Billing and reimbursement: Influences Diagnosis-Related Group (DRG) assignment and risk adjustment
- Quality reporting and data analytics: Supports population health initiatives and outcome tracking
Inaccurate or vague documentation can lead to under-coding, claim denials, or delayed payments. Therefore, precise identification of fatty liver etiology and staging is critical.
Primary ICD-10 Codes for Fatty Liver
Below are the most common ICD-10 codes used when diagnosing fatty liver conditions:
| ICD-10 Code | Description |
| K76.0 | Fatty (change of) liver, not elsewhere classified – use this for general, unspecified fatty liver or simple steatosis |
| K75.81 | Nonalcoholic steatohepatitis (NASH) – use when inflammation or fibrosis is documented |
| K70.0 | Alcoholic fatty liver – for patients with fatty liver due to alcohol use |
| K76.9 | Liver disease, unspecified – use only when no specific diagnosis is documented |
These codes must align with the patient’s history, lab results, imaging, or biopsy findings. Coders should always review documentation to determine the most accurate and specific ICD-10 code.
ICD-10 Codes for Nonalcoholic Fatty Liver Disease (NAFLD)
Nonalcoholic fatty liver disease is a chronic liver condition not caused by alcohol intake. It’s closely associated with obesity, Type 2 diabetes, and dyslipidemia.
ICD-10 Code: K76.0
Description: Fatty (change of) liver, not elsewhere classified
Use K76.0 when:
- Imaging shows hepatic steatosis without inflammation
- The provider documents “NAFLD” or “fatty liver” without specifying steatohepatitis
- No alcohol use is involved
This code also corresponds with hepatic steatosis ICD 10 in clinical records.
Make sure the documentation rules out alcohol as a contributing factor to use this code appropriately.
Nonalcoholic Steatohepatitis (NASH): ICD-10 Coding
NASH is a progressive form of NAFLD characterized by liver inflammation and cell damage. It may lead to fibrosis or cirrhosis over time.
ICD-10 Code: K75.81
Description: Nonalcoholic steatohepatitis (NASH)
Use K75.81 when:
- Liver biopsy or imaging confirms inflammation or fibrosis
- Documentation specifically mentions “NASH”
- No alcohol use is implicated in the condition
This code is essential for patients at higher risk of progression and should be linked with comorbidities like obesity, diabetes, and hyperlipidemia.
Alcoholic Fatty Liver Disease ICD-10 Codes
When fatty liver is due to alcohol consumption, coding must reflect this etiology. The documentation should clearly mention alcohol use and any associated complications.
Coding Tips:
- Alcohol use must be clearly documented in the chart
- Include history, frequency, and duration if available
- Avoid using K76.0 in alcohol-related cases use the K70.x series instead
Proper selection of icd 10 fatty liver codes in alcoholic cases ensures accuracy and compliance, particularly for high-risk patients.
Other Fatty Liver Conditions: ICD-10 Coding
Not all cases of fatty liver fall under alcoholic or nonalcoholic classifications. Sometimes, fatty liver is secondary to cardiovascular issues, ischemia, or unclear etiologies. Here are ICD-10 codes for less common or complex presentations:
| ICD-10 Code | Description |
| K76.1 | Chronic passive congestion of liver (e.g., due to heart failure, also called “nutmeg liver”) |
| K76.2 | Central hemorrhagic necrosis of liver |
| K76.89 | Other specified liver diseases (for fatty liver cases that don’t fit other codes) |
| K76.9 | Liver disease, unspecified (should only be used if documentation lacks specificity) |
Avoid unspecified codes like K76.9 unless absolutely necessary. They may trigger payer denials or medical necessity queries.
Common Comorbidities and Contributing Conditions
Fatty liver disease rarely occurs in isolation. Coders and clinicians should document and code contributing conditions to fully capture the patient’s clinical picture and ensure appropriate risk adjustment for reimbursement.
These codes are critical when coding for nonalcoholic fatty liver disease ICD 10 or nonalcoholic steatohepatitis ICD 10, as they justify further testing, monitoring, and treatment decisions.
Drug-Induced and Pregnancy-Related Fatty Liver ICD-10 Codes
Drug-Induced Fatty Liver (Toxic Liver Disease)
Toxic liver injury can mimic fatty liver disease and should be coded based on the specific mechanism of injury:
| ICD-10 Code | Description |
| K71.0 | Toxic liver disease with cholestasis |
| K71.1 | Toxic liver disease with hepatic necrosis |
| K71.9 | Toxic liver disease, unspecified |
Be sure to document the offending medication, supplement, or toxin when assigning these codes.
Pregnancy-Associated Fatty Liver
Acute fatty liver of pregnancy (AFLP) is a rare but potentially fatal condition requiring urgent management.
| ICD-10 Code | Description |
| O26.61 | Liver and biliary tract disorders in pregnancy, first trimester |
| O26.62 | …second trimester |
| O26.63 | …third trimester |
| O26.69 | …unspecified trimester |
AFLP requires high clinical suspicion and rapid diagnosis. Include gestational age and symptoms in the documentation.
Billing, Documentation, and Reimbursement Guidelines
Proper documentation is as important as correct code selection. Here are key practices that support accurate billing and higher reimbursement:
Documentation Best Practices
- Identify type of fatty liver (NAFLD, NASH, alcoholic, drug-induced, pregnancy-related)
- Specify degree of severity: Is it simple steatosis or steatohepatitis?
- Mention confirmatory tests: Imaging, biopsy, labs
- Clearly document alcohol use or abstinence
- List associated comorbidities such as obesity or diabetes
Billing Tips
- Use K75.81 instead of K76.0 if NASH is confirmed
- Link diagnoses with E/M services, imaging studies, and procedures (e.g., liver biopsy)
- Avoid unspecified codes (like K76.9) when possible—they can delay claims
Reimbursement Considerations
- Pair ICD-10 codes with appropriate CPT codes for diagnostics and procedures
- Leverage Hierarchical Condition Categories (HCCs) to reflect patient complexity
- Check payer-specific LCDs (Local Coverage Determinations) for lab/imaging approvals
Accurate coding supports not only compliance but also financial sustainability in value-based care models.
Conclusion
Accurately coding for fatty liver disease using ICD-10 is essential for delivering high-quality care, securing appropriate reimbursement, and maintaining compliance. Whether your patient has NAFLD, NASH, alcoholic fatty liver, or a rare complication like AFLP, your documentation and coding must reflect the true clinical picture.
Proper documentation, awareness of comorbidities, and up-to-date coding knowledge aren’t just best practices they’re essential for maximizing reimbursement and avoiding costly errors.
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