Are your claims for nonalcoholic steatohepatitis (NASH) being denied, delayed, or underpaid despite having suitable documentation? Healthcare professionals frequently misapply and miss ICD-10 codes for NASH, resulting in reimbursement gaps and administrative difficulties. A recent retrospective audit found that ICD-10 coding underestimates the documented prevalence of NAFLD/NASH by 42.9%, despite accurate coding being a strong predictor of clinical confirmation.
The global burden of NASH and related liver diseases continues to rise. According to systematic review statistics, the average incidence of NASH in the adult population is 5.27%, with significant regional heterogeneity and higher prevalence in areas with high rates of metabolic disease. More than 65% of adults with type 2 diabetes may have NAFLD or its inflammatory variant, with up to 40% exhibiting severe fibrosis.
This blog outlines NASH ICD-10 coding, including when K75.81 should be recorded, when extra codes are required, and typical errors.
Nash ICD-10: Know More About
Correct classification of NASH has a direct impact on reimbursement, compliance, and patient care. Many doctors and coders become confused while determining the proper ICD-10 code or recording the disease, which can result in claim denials or underpayment. Understanding the Nash ICD-10 coding standards promotes accurate reporting and avoids administrative delays.
What NASH Represents in ICD-10-CM
Nonalcoholic steatohepatitis (NASH) is a progressive liver illness associated with metabolic syndrome and nonalcoholic fatty liver disease (NAFLD). NASH is classified as K75.81 in ICD-10-CM, which stands for inflammation and fat accumulation in the liver without alcohol involvement. This coding identifies disease severity, which is critical for accurate claims, quality reporting, and population health tracking.
ICD-10 Code for NASH (K75.81)
- K75.81 is the specific code for NASH.
- If cirrhosis is present, assign K74.60 or K74.69 alongside K75.81.
- Avoid using general NAFLD codes alone when NASH is confirmed.
- Accurate coding informs treatment plans, reimbursement, and clinical research data.
Documentation Requirements for K75.81
1. Proper documentation must include:
2. Histological confirmation or imaging evidence of steatohepatitis.
3. Exclusion of alcohol-related liver disease.
4. Presence or absence of fibrosis or cirrhosis.
5. Comorbidities such as diabetes or obesity, if relevant.
Common Coding and Billing Errors
- Assigning NAFLD codes instead of K75.81.
- Omitting cirrhosis when present.
- Using nonspecific liver disease codes.
- Inadequate supporting clinical documentation.
ICD-10 Code for NASH and Related Liver Conditions
Correct coding of NASH and related liver conditions is essential for accurate billing, reimbursement, and clinical reporting. Errors in code assignment can lead to claim denials, audit risks, and incomplete patient records. Understanding the differences between NASH, NAFLD, fibrosis, and cirrhosis is critical for both providers and coders.
NASH vs NAFLD Coding Differences
NASH (Nonalcoholic Steatohepatitis) is coded as K75.81.
NAFLD (Nonalcoholic Fatty Liver Disease) without inflammation is coded as K76.0.
Assigning NAFLD codes for confirmed NASH can result in underreporting of disease severity.
Always document histological or imaging evidence to distinguish NASH from simple fatty liver.
ICD-10 Code for NASH with Fibrosis
| Condition / Stage | ICD-10 Code | Notes for Documentation (2026) |
| NASH (Nonalcoholic Steatohepatitis) | K75.81 | Confirmed via biopsy, imaging, or lab markers. Must indicate inflammation and steatosis. |
| Fibrosis – Stage 1 (Mild) | K74.0 | Document mild perisinusoidal or portal fibrosis. |
| Fibrosis – Stage 2 (Moderate) | K74.1 | Include the location and extent of fibrosis. |
| Fibrosis – Stage 3 (Severe / Bridging) | K74.2 | Confirm bridging fibrosis between portal tracts or central veins. |
| Fibrosis – Stage 4 / Cirrhosis | K74.60 / K74.69 | Document cirrhosis type; include complications (ascites, portal hypertension). |
ICD-10 Code for NASH Cirrhosis
| Condition / Type of Cirrhosis | ICD-10 Code | Notes for Documentation (2026 |
| NASH Cirrhosis, Unspecified | K74.60 | Use when cirrhosis is confirmed, but complications are not specified. |
| NASH Cirrhosis with Ascites | K74.69 + R18.0 | Document fluid accumulation; ascites code (R18.0) should be added for accurate billing. |
| NASH Cirrhosis with Hepatic Encephalopathy | K74.69 + G93.40 | Include neurological complications; use G93.40 for hepatic encephalopathy. |
| NASH Cirrhosis with Portal Hypertension | K74.69 + I85.0 | Document portal hypertension separately; include varices if present |
| NASH Cirrhosis with Other Complications | K74.69 + relevant complication codes | Specify all complications to ensure correct reimbursement and quality reporting. |
ICD-10 Code for NASH Cirrhosis
This section outlines proper coding for NASH cirrhosis using ICD-10. Accurate sequencing and documentation are critical for both reimbursement and compliance.
Sequencing K75.81 with K74.6
Nonalcoholic steatohepatitis (NASH) with cirrhosis requires careful code sequencing. According to ICD-10-CM 2026 guidelines:
| Code | Description | Sequencing Guidance | Notes/Considerations |
| K75.81 | Nonalcoholic steatohepatitis (NASH) | List first if NASH is the primary diagnosis | Document liver inflammation with lab results, imaging, or biopsy. |
| K74.60–K74.69 | Cirrhosis of the liver (unspecified, with fibrosis, or NASH-related) | List second to capture the cirrhosis stage | Include complications like ascites (R18.0), portal hypertension (I85.0), or hepatic encephalopathy (G93.40). |
| Additional Codes | Complications (ascites, portal hypertension, encephalopathy) | Add after primary and secondary codes as documented | Ensures accurate severity and reimbursement. |
Best practice for Coders and Billers
1. Code K75.81 first if the primary diagnosis is inflammation-driven NASH.
2. Follow with K74.6 series to capture cirrhosis stage or complications.
3. Include additional codes for ascites (R18.0), hepatic encephalopathy (G93.40), or portal hypertension (I85.0) when present.
Inpatient vs Outpatient Coding Considerations
Coding requirements differ between inpatient and outpatient settings:
Inpatient: Use principal diagnosis to guide DRG assignment. K75.81 with K74.69 may affect reimbursement tiers.
Outpatient: Ensure NASH is documented alongside cirrhosis complications to avoid claim denials. Use modifiers if multiple visits are billed for the same patient.
Key points for providers and revenue teams:
- Confirm diagnosis via lab results, imaging, and liver biopsy.
- Include all documented complications to support severity and reimbursement.
- Avoid using cirrhosis codes without confirming NASH-related etiology.
Billing and Reimbursement Considerations
Accurate coding of NASH affects reimbursement and payer review. Understanding DRG assignment and medical necessity ensures correct claims and reduces denials.
DRG Impact of NASH Coding
| Factor | Impact on DRG | Notes |
| Primary Diagnosis: K75.81 | Assigns DRG based on NASH without cirrhosis | Accurate documentation of inflammation is essential for correct DRG assignment. |
| Secondary Diagnosis: K74.6 (Cirrhosis) | May increase DRG weight if cirrhosis is significant | Include complications such as ascites or hepatic encephalopathy to capture severity. |
| Comorbidities | Can affect DRG grouping | Common comorbidities: obesity, diabetes, and hyperlipidemia. Proper coding may improve reimbursement. |
Medical Necessity and Payer Review Risk
- Payers often scrutinize NASH coding due to overlapping liver disease codes.
- Document clinical findings such as liver enzymes, imaging, and biopsy results to justify the NASH diagnosis.
- Insufficient documentation can trigger claim denials or requests for additional information.
- Always verify payer-specific guidelines for NASH-related claims in 2026 to reduce review risk.
Conclusion
Accurate NASH ICD-10 coding ensures correct reimbursement, reduces payer review risk, and supports effective patient management. Recording K75.81 alongside cirrhosis or fibrosis codes captures disease severity and prevents claim delays.
Providers, coders, and billing teams should confirm diagnoses with lab results, imaging, or biopsy evidence and include all relevant complications. Consistent documentation and correct sequencing safeguard revenue, maintain compliance, and improve clinical reporting.
FAQs
What is the ICD-10 code for NASH?
The ICD-10 code for nonalcoholic steatohepatitis is K75.81. It identifies liver inflammation with fat accumulation unrelated to alcohol use.
How do I code NASH with fibrosis?
Use K75.81 for NASH and select the appropriate K74.x code for fibrosis stage (1–4) based on biopsy or imaging results.
What is the ICD-10 code for NASH cirrhosis?
NASH-related cirrhosis is coded as K74.60 (unspecified) or K74.69 for cirrhosis with complications, including ascites or portal hypertension.
How should K75.81 be sequenced with K74.6?
List K75.81 first if NASH is the primary diagnosis, followed by K74.6 for cirrhosis, adding complication codes like R18.0 or G93.40 if present.
What documentation is required for accurate NASH coding?
Document histology, imaging, or lab evidence of steatohepatitis, rule out alcohol-related disease, and note fibrosis or cirrhosis stages to support codi
