ICD-10 Code K73.1 – Chronic lobular hepatitis, not elsewhere classified (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code K73.1 – Chronic lobular hepatitis, not elsewhere classified
What it is
K73.1 identifies chronic lobular hepatitis when the type is not classified elsewhere. Use it for a long-standing inflammatory liver condition documented with lobular involvement and no more specific diagnosis.
Clinical signs
Clinical features vary; refer to documentation. Typical references describe chronic liver inflammation, which may present with abnormal liver tests, fatigue, or nonspecific hepatic symptoms.
When to use this code
Use K73.1 when the provider documents chronic lobular hepatitis and does not specify a different chronic hepatitis type. It also fits when the record clearly supports chronic lobular hepatitis but lacks a more precise category. Check documentation if the note suggests viral, autoimmune, or drug-related hepatitis instead.
Do not use for
Do not use this code for acute hepatitis or for chronic hepatitis with a more specific documented cause or type. If the chart does not clearly state chronic lobular hepatitis, check documentation.
Coding tip
Code K73.1 only when “chronic lobular hepatitis” is explicitly documented and no more specific hepatitis code applies.